0001156375-26-000047 | 10-Q | XBRL Viewer

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Guarantees (Details) $ in Thousands	6 Months Ended
Guarantees (Details) $ in Thousands	Jun. 30, 2026 USD ($)
Guarantor Obligations [Line Items]
Agreement automatic renewal period (in years)	2 years
Contingent liability to SGX, amount of irrevocable letters of credit	$ 400,000
Commitment fee	350,000
Family Farmer and Ranchers Protection Fund
Guarantor Obligations [Line Items]
Payment per participant	25
Payment per cooperative	100
Future losses	100,000
Payments under guarantee	2,000
Available for future claims	$ 98,000

Basis of Presentation	6 Months Ended
Basis of Presentation	Jun. 30, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The consolidated financial statements consist of CME Group Inc. (CME Group) and its subsidiaries (collectively, the company), including Chicago Mercantile Exchange Inc. (CME), Board of Trade of the City of Chicago, Inc. (CBOT), New York Mercantile Exchange, Inc. (NYMEX), Commodity Exchange, Inc. (COMEX) and NEX Group Limited (NEX). The clearing house is operated by CME. The accompanying interim consolidated financial statements have been prepared by CME Group without audit. Certain notes and other information normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States have been condensed or omitted. In the opinion of management, the accompanying consolidated financial statements include all adjustments (consisting only of normal recurring adjustments) considered necessary to present fairly the financial position of the company at June 30, 2026 and December 31, 2025 and the results of operations and cash flows for the periods indicated. Quarterly results are not necessarily indicative of results for any subsequent period. The accompanying consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto in CME Group’s Annual Report on Form 10-K for the year ended December 31, 2025, filed with the Securities and Exchange Commission (SEC) on February 26, 2026.

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025
Cash Flows from Operating Activities
Net Income	$ 2,196.1	$ 1,981.3
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation	46.6	41.9
Amortization of purchased intangibles	112.1	111.3
Depreciation and amortization	55.4	54.6
Net realized and unrealized (gains) losses on investments	19.1	(2.6)
Deferred income taxes	(8.2)	(20.7)
Change in:
Accounts receivable	(112.9)	(95.4)
Other current assets	37.8	(24.6)
Other assets	(141.9)	29.8
Accounts payable	(3.8)	12.5
Income taxes payable	(40.4)	28.3
Other current liabilities	(49.4)	67.9
Other liabilities	113.4	(9.2)
Other	(16.9)	0.0
Net Cash Provided by Operating Activities	2,207.0	2,175.1
Cash Flows from Investing Activities
Proceeds from maturities of available-for-sale marketable securities	2.0	4.8
Purchases of available-for-sale marketable securities	(2.2)	(3.8)
Purchases of property, net	(45.4)	(32.6)
Investments in privately-held equity investments	(6.8)	(2.4)
Net Cash Used in Investing Activities	(52.4)	(34.0)
Cash Flows from Financing Activities
Proceeds from debt, net of issuance costs	0.0	742.3
Repayment of debt	0.0	(750.0)
Cash dividends	(3,165.7)	(3,022.7)
Repurchase of Class A common stock, including costs	(1,236.9)	(8.2)
Change in performance bond and guaranty fund contributions	(1,545.4)	43,262.5
Employee taxes paid on restricted stock vesting	(22.2)	(8.8)
Other	(4.6)	(4.5)
Net Cash (Used in) Provided by Financing Activities	(5,974.8)	40,210.6
Net change in cash, cash equivalents, restricted cash and restricted cash equivalents	(3,820.2)	42,351.7
Cash, cash equivalents, restricted cash and restricted cash equivalents, beginning of period	164,079.5	101,794.1
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, End of Period	160,259.3	144,145.8
Reconciliation of cash, cash equivalents, restricted cash and restricted cash equivalents:
Cash and cash equivalents	2,144.2	1,981.3
Short-term restricted cash	4.4	6.5
Restricted cash and restricted cash equivalents (performance bonds and guaranty fund contributions)	158,110.7	142,158.0
Total	160,259.3	144,145.8
Supplemental Disclosure of Cash Flow Information
Income taxes paid, net of refunds	689.7	579.6
Interest paid	$ 70.2	$ 65.0

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 26,618.2	$ 27,030.7	$ 28,728.2	$ 26,486.9
Other comprehensive income (loss) before reclassifications and income tax benefit (expense)			(28.9)	163.2
Amounts reclassified from accumulated other comprehensive income (loss)			(2.2)	(2.1)
Income tax benefit (expense)			4.1	(10.2)
Other comprehensive income (loss), net of tax	(4.5)	120.2	(27.0)	150.9
Ending balance	26,520.4	27,739.0	26,520.4	27,739.0
Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	59.4	(74.8)	81.9	(105.5)
Ending balance	54.9	45.4	54.9	45.4
Investment Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			0.0	(0.3)
Other comprehensive income (loss) before reclassifications and income tax benefit (expense)			(0.1)	0.1
Amounts reclassified from accumulated other comprehensive income (loss)			0.0	0.0
Income tax benefit (expense)			0.0	0.0
Other comprehensive income (loss), net of tax			(0.1)	0.1
Ending balance	(0.1)	(0.2)	(0.1)	(0.2)
Defined Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			0.3	(14.1)
Other comprehensive income (loss) before reclassifications and income tax benefit (expense)			(2.2)	(1.2)
Amounts reclassified from accumulated other comprehensive income (loss)			(0.1)	(0.1)
Income tax benefit (expense)			0.5	0.3
Other comprehensive income (loss), net of tax			(1.8)	(1.0)
Ending balance	(1.5)	(15.1)	(1.5)	(15.1)
Derivative Investments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			56.2	59.3
Other comprehensive income (loss) before reclassifications and income tax benefit (expense)			0.0	0.0
Amounts reclassified from accumulated other comprehensive income (loss)			(2.1)	(2.0)
Income tax benefit (expense)			0.5	0.5
Other comprehensive income (loss), net of tax			(1.6)	(1.5)
Ending balance	54.6	57.8	54.6	57.8
Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			25.4	(150.4)
Other comprehensive income (loss) before reclassifications and income tax benefit (expense)			(26.6)	164.3
Amounts reclassified from accumulated other comprehensive income (loss)			0.0	0.0
Income tax benefit (expense)			3.1	(11.0)
Other comprehensive income (loss), net of tax			(23.5)	153.3
Ending balance	$ 1.9	$ 2.9	$ 1.9	$ 2.9

Debt

6 Months Ended

Jun. 30, 2026

Debt Disclosure [Abstract]

Debt

Long-term debt consisted of the following at June 30, 2026 and December 31, 2025:


(in millions)	June 30, 2026		December 31, 2025
$500.0 million fixed rate notes due June 2028, stated rate of 3.75%	$	499.2	$	498.9
$750.0 million fixed rate notes due March 2030, stated rate of 4.40%	743.0		742.1
$750.0 million fixed rate notes due March 2032, stated rate of 2.65%	745.0		744.6
$750.0 million fixed rate notes due September 2043, stated rate of 5.30% (1)	744.7		744.6
$700.0 million fixed rate notes due June 2048, stated rate of 4.15%	692.3		692.1
Total long-term debt	$	3,424.2	$	3,422.3

(1)The company maintained a forward-starting interest rate swap agreement that modified the interest obligation associated with these notes so that the interest payable on the notes effectively became fixed at a rate of 4.73%.

Long-term debt maturities, at par value, were as follows at June 30, 2026:


(in millions)	Par Value
2027	$	—
2028	500.0
2029	—
2030	750.0
2031	—
Thereafter	2,200.0

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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+ Details

Revenue Recognition (Tables)

6 Months Ended

Jun. 30, 2026

Revenue Recognition [Abstract]

Schedule of Disaggregation of Revenue

The following table represents a disaggregation of revenue from contracts with customers by product line for the quarters and six months ended June 30, 2026 and 2025:


	Quarter Ended June 30,				Six Months Ended June 30,
(in millions)	2026		2025		2026		2025
Interest rates	$	433.0	$	461.6	$	954.2	$	897.9
Equity indexes	324.0		301.6		639.6		605.8
Foreign exchange	49.8		52.4		106.6		105.8
Agricultural commodities	183.8		174.7		351.3		339.0
Energy	187.0		217.4		450.7		433.8
Metals	76.7		85.1		195.1		156.0
BrokerTec fixed income	40.1		37.1		80.3		72.9
EBS foreign exchange	33.8		37.5		70.2		72.7
Interest rate swap	24.3		20.6		47.1		41.4
Total clearing and transaction fees	1,352.5		1,388.0		2,895.1		2,725.3
Market data and information services	238.1		198.1		462.2		392.6
Other	115.6		105.9		229.0		216.4
Total revenues	$	1,706.2	$	1,692.0	$	3,586.3	$	3,334.3

Timing of Revenue Recognition
Services transferred at a point in time	$	1,323.4	$	1,361.7	$	2,840.4	$	2,670.8
Services transferred over time	377.3		324.7		734.6		652.9
One-time charges and miscellaneous revenues	5.5		5.6		11.3		10.6
Total revenues	$	1,706.2	$	1,692.0	$	3,586.3	$	3,334.3

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2026

Fair Value Disclosures [Abstract]

Schedule of Financial Instruments Measured at Fair Value

The following table presents financial instruments measured at fair value on a recurring basis:


	June 30, 2026
(in millions)	Level 1		Level 2		Level 3		Total
Assets at Fair Value:
Marketable securities:
Corporate debt securities	$	6.8	$	—	$	—	$	6.8

Mutual funds	123.6		—		—		123.6
Equity securities	1.0		—		—		1.0

Total Marketable Securities	131.4		—		—		131.4





Total Assets at Fair Value	$	131.4	$	—	$	—	$	131.4

Schedule of Fair value of Debt Instruments

At June 30, 2026, the fair values were as follows:


(in millions)	Fair Value		Level

$500.0 million fixed rate notes due June 2028	$	495.2	Level 2
$750.0 million fixed rate notes due March 2030	748.4		Level 2
$750.0 million fixed rate notes due March 2032	677.4		Level 2
$750.0 million fixed rate notes due September 2043	749.1		Level 2
$700.0 million fixed rate notes due June 2048	584.7		Level 2

Leases (Schedule of Supplemental Cash Flow) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Leases [Abstract]
Cash outflows for operating leases	$ 15.8	$ 15.2	$ 29.9	$ 30.3
Cash outflows for finance lease	$ 4.4	$ 4.3	$ 8.8	$ 8.7

Intangible Assets and Goodwill (Schedule of Components of Intangible Assets) (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Intangible Assets [Line Items]
Assigned Value	$ 4,831.1	$ 4,839.4
Accumulated Amortization	(2,786.5)	(2,678.7)
Net Book Value	2,044.6	2,160.7
Total intangible assets – other, net	2,494.6	2,610.7
Trading products	17,175.3	17,175.3
Trade names
Intangible Assets [Line Items]
Trade names	450.0	450.0
Clearing firm, market data and other customer relationships
Intangible Assets [Line Items]
Assigned Value	4,695.3	4,703.0
Accumulated Amortization	(2,661.8)	(2,557.5)
Net Book Value	2,033.5	2,145.5
Technology-related intellectual property
Intangible Assets [Line Items]
Assigned Value	62.5	62.5
Accumulated Amortization	(62.5)	(62.5)
Net Book Value	0.0	0.0
Other
Intangible Assets [Line Items]
Assigned Value	73.3	73.9
Accumulated Amortization	(62.2)	(58.7)
Net Book Value	$ 11.1	$ 15.2

Debt (Schedule of Maturities of Long-Term Debt) (Details) $ in Millions	Jun. 30, 2026 USD ($)
Debt Disclosure [Abstract]
2027	$ 0.0
2028	500.0
2029	0.0
2030	750.0
2031	0.0
Thereafter	$ 2,200.0

Intangible Assets and Goodwill (Schedule of Future Estimated Amortization Expense) (Details) $ in Millions	Jun. 30, 2026 USD ($)
Intangible Asset, Goodwill and Other [Abstract]
Remainder of 2026	$ 111.1
2027	220.9
2028	214.4
2029	214.4
2030	214.4
2031	214.4
Thereafter	$ 855.0

Intangible Assets and Goodwill (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Intangible Asset, Goodwill and Other [Abstract]
Amortization of purchased intangibles	$ 56.0	$ 56.1	$ 112.1	$ 111.3
Amortizable intangible assets			$ 4.1

- Definition

Amount of amortization expense for finite-lived intangible asset. Excludes goodwill and capitalized cost for software to be sold, leased, or marketed.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482558/350-40-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482665/350-30-50-2

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-11

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-18

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 24
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-24

Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476148/220-40-50-12

Reference 8: http://www.xbrl.org/2003/role/exampleRef
-Name Accounting Standards Codification
-Section 55
-Paragraph 40
-SubTopic 30
-Topic 350
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482640/350-30-55-40

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482686/350-30-45-2

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476148/220-40-50-6

+ Details

Accounting Policies	6 Months Ended
Accounting Policies	Jun. 30, 2026
Accounting Policies [Abstract]
Accounting Policies	Accounting Policies Newly Adopted Accounting Policies. In July 2025, the FASB issued an accounting standards update which provides a practical expedient when estimating the amount of expected credit losses on current accounts receivable and current contract assets. This update permits entities to assume that current conditions as of the balance sheet date do not change for the remaining life of the current accounts receivable and current contract assets. Therefore, entities will not need to develop reasonable and supportable forecasts of future economic conditions. The practical expedient must be applied consistently across all current accounts receivable and current contract assets. The company adopted this standard on January 1, 2026, and has elected to apply the practical expedient. The adoption of this guidance did not have a material impact on our consolidated financial statements.

Revenue Recognition (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Total Revenues	$ 1,706.2	$ 1,692.0	$ 3,586.3	$ 3,334.3
Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenues	1,323.4	1,361.7	2,840.4	2,670.8
Services transferred over time
Disaggregation of Revenue [Line Items]
Revenues	377.3	324.7	734.6	652.9
One-time charges and miscellaneous revenues
Disaggregation of Revenue [Line Items]
Revenues	5.5	5.6	11.3	10.6
Clearing and transaction fees
Disaggregation of Revenue [Line Items]
Revenues	1,352.5	1,388.0	2,895.1	2,725.3
Total Revenues	1,352.5	1,388.0	2,895.1	2,725.3
Clearing and transaction fees \| Interest rates
Disaggregation of Revenue [Line Items]
Revenues	433.0	461.6	954.2	897.9
Clearing and transaction fees \| Equity indexes
Disaggregation of Revenue [Line Items]
Revenues	324.0	301.6	639.6	605.8
Clearing and transaction fees \| Foreign exchange
Disaggregation of Revenue [Line Items]
Revenues	49.8	52.4	106.6	105.8
Clearing and transaction fees \| Agricultural commodities
Disaggregation of Revenue [Line Items]
Revenues	183.8	174.7	351.3	339.0
Clearing and transaction fees \| Energy
Disaggregation of Revenue [Line Items]
Revenues	187.0	217.4	450.7	433.8
Clearing and transaction fees \| Metals
Disaggregation of Revenue [Line Items]
Revenues	76.7	85.1	195.1	156.0
Clearing and transaction fees \| BrokerTec fixed income
Disaggregation of Revenue [Line Items]
Revenues	40.1	37.1	80.3	72.9
Clearing and transaction fees \| EBS foreign exchange
Disaggregation of Revenue [Line Items]
Revenues	33.8	37.5	70.2	72.7
Clearing and transaction fees \| Interest rate swap
Disaggregation of Revenue [Line Items]
Revenues	24.3	20.6	47.1	41.4
Market data and information services
Disaggregation of Revenue [Line Items]
Revenues	238.1	198.1	462.2	392.6
Total Revenues	238.1	198.1	462.2	392.6
Other
Disaggregation of Revenue [Line Items]
Revenues	115.6	105.9	229.0	216.4
Total Revenues	$ 115.6	$ 105.9	$ 229.0	$ 216.4

Leases (Narrative) (Details)	Jun. 30, 2026
Leases [Abstract]
Remaining lease term	12 years
Renew the leases for up to	5 years
Terminate the leases in less then	12 months
Short-term leases for a lease term	12 months

Leases (Schedule of Future Minimum Finance Lease Payments) (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Leases [Abstract]
Remainder of 2026	$ 8.8
2027	17.8
2028	17.9
2029	18.1
2030	18.3
2031	4.6
Thereafter	0.0
Total lease payments	85.5
Less: imputed interest	(39.2)
Total finance lease liabilities	$ 46.3	$ 50.7

Accumulated Other Comprehensive Income (Loss) (Tables)

6 Months Ended

Jun. 30, 2026

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

The following tables present changes in the accumulated balances for each component of other comprehensive income (loss), including current period other comprehensive income (loss) and reclassifications out of accumulated other comprehensive income (loss):


(in millions)	Investment Securities		Defined Benefit Plans		Derivative Investments		Foreign Currency Translation		Total
Balance at December 31, 2025	$	—	$	0.3	$	56.2	$	25.4	$	81.9
Other comprehensive income (loss) before reclassifications and income tax benefit (expense)	(0.1)		(2.2)		—		(26.6)		(28.9)
Amounts reclassified from accumulated other comprehensive income (loss)	—		(0.1)		(2.1)		—		(2.2)
Income tax benefit (expense)	—		0.5		0.5		3.1		4.1
Net current period other comprehensive income (loss)	(0.1)		(1.8)		(1.6)		(23.5)		(27.0)
Balance at June 30, 2026	$	(0.1)	$	(1.5)	$	54.6	$	1.9	$	54.9


(in millions)	Investment Securities		Defined Benefit Plans		Derivative Investments		Foreign Currency Translation		Total
Balance at December 31, 2024	$	(0.3)	$	(14.1)	$	59.3	$	(150.4)	$	(105.5)
Other comprehensive income (loss) before reclassifications and income tax benefit (expense)	0.1		(1.2)		—		164.3		163.2

Amounts reclassified from accumulated other comprehensive income (loss)	—		(0.1)		(2.0)		—		(2.1)
Income tax benefit (expense)	—		0.3		0.5		(11.0)		(10.2)
Net current period other comprehensive income (loss)	0.1		(1.0)		(1.5)		153.3		150.9

Balance at June 30, 2025	$	(0.2)	$	(15.1)	$	57.8	$	2.9	$	45.4

Accounting Policies (Policies)	6 Months Ended
Accounting Policies (Policies)	Jun. 30, 2026
Accounting Policies [Abstract]
Newly Adopted Accounting Policies	Newly Adopted Accounting Policies. In July 2025, the FASB issued an accounting standards update which provides a practical expedient when estimating the amount of expected credit losses on current accounts receivable and current contract assets. This update permits entities to assume that current conditions as of the balance sheet date do not change for the remaining life of the current accounts receivable and current contract assets. Therefore, entities will not need to develop reasonable and supportable forecasts of future economic conditions. The practical expedient must be applied consistently across all current accounts receivable and current contract assets. The company adopted this standard on January 1, 2026, and has elected to apply the practical expedient. The adoption of this guidance did not have a material impact on our consolidated financial statements.
Revenue Recognition	Revenue Recognition The company generates revenue from customers from the following sources: Clearing and transaction fees. Clearing and transaction fees include per-contract charges for trade matching, clearing, trading on the company's electronic trading platforms, portfolio reconciliation and compression services, risk mitigation, and other fees. Clearing and transaction fees are assessed upfront at the time of trade execution. As such, the company recognizes the majority of the fee revenue upon successful execution of the trade. The minimal remaining portion of the fee revenue related to settlement activities performed after trade execution is recognized over the short-term period that the contract is outstanding, based on management’s estimates of the average contract lifecycle. These estimates are based on various assumptions to approximate the amount of fee revenue to be attributed to services performed through contract settlement, expiration, or termination. For cleared trades, these assumptions include the average number of days that a contract remains in open interest, contract turnover, average revenue per day, and revenue remaining in open interest at the end of each period. The nature of contracts gives rise to several types of variable consideration, including volume-based pricing tiers, customer incentives associated with market maker programs and other fee discounts. The company includes fee discounts and incentives in the estimated transaction price when there is a basis to reasonably estimate the amount of the fee reduction. These estimates are based on historical experience, anticipated performance, and best judgment at the time. Because of the company's certainty in estimating these amounts, they are included in the transaction price of contracts. Market data and information services. Market data and information services represent revenue from the dissemination of market data to subscribers, distributors, and other third-party licensees of market data. Pricing for market data is primarily based on the number of reportable devices used as well as the number of subscribers enrolled under the arrangement. Fees for these services are generally billed monthly. Market data services are satisfied over time and revenue is recognized on a monthly basis as the customers receive and consume the benefit of the market data services. However, the company also maintains certain annual license arrangements with one-time upfront fees. The fees for annual licenses are initially recorded as a contract liability and recognized as revenue monthly over the term of the annual period. Other. Other revenues include certain access and communication fees, fees for collateral management, equity membership subscription fees, and fees for trade order routing through agreements from various strategic relationships. Access and communication fees are charged to customers that utilize various telecommunications networks and communications services. Fees for these services are generally billed monthly and the associated fee revenue is recognized as billed. Collateral management fees are charged to clearing firms that have collateral on deposit with the clearing house to meet their minimum performance bond and guaranty fund obligations on the exchange. These fees are calculated based on daily collateral balances and are billed monthly. This fee revenue is recognized monthly as billed as the customers receive and consume the benefits of the services. The company also has an equity membership program which provides equity members the option to pay a monthly subscription fee in satisfaction of their existing requirement to hold CME Group Class A common stock. Choosing to pay this fee in lieu of holding Class A shares is entirely voluntary and the client's choice. Fee revenue under this program is earned monthly as billed over the contractual term. Pricing for strategic relationships may be driven by customer levels and activity. There are fee arrangements which provide for monthly as well as quarterly payments in arrears. Revenue is recognized monthly for strategic relationship arrangements as the customers receive and consume the benefits of the services.

Debt (Schedule of Short-Term and Long-Term Debt) (Details) - USD ($) $ in Millions	1 Months Ended
	Sep. 30, 2013	Jun. 30, 2026	Dec. 31, 2025
Debt Instrument [Line Items]
Long-term debt		$ 3,424.2	$ 3,422.3
Forward starting interest rate swap agreement fixed rate	4.73%
$500.0 million fixed rate notes due June 2028, stated rate of 3.75%
Debt Instrument [Line Items]
Debt instrument, face amount		$ 500.0
Stated percentage		3.75%
Long-term debt		$ 499.2	498.9
$750.0 million fixed rate notes due March 2030, stated rate of 4.40%
Debt Instrument [Line Items]
Debt instrument, face amount		$ 750.0
Stated percentage		4.40%
Long-term debt		$ 743.0	742.1
$750.0 million fixed rate notes due March 2032, stated rate of 2.65%
Debt Instrument [Line Items]
Debt instrument, face amount		$ 750.0
Stated percentage		2.65%
Long-term debt		$ 745.0	744.6
$750.0 million fixed rate notes due September 2043, stated rate of 5.30%
Debt Instrument [Line Items]
Debt instrument, face amount		$ 750.0
Stated percentage		5.30%
Long-term debt		$ 744.7	744.6
$700.0 million fixed rate notes due June 2048, stated rate of 4.15%
Debt Instrument [Line Items]
Debt instrument, face amount		$ 700.0
Stated percentage		4.15%
Long-term debt		$ 692.3	$ 692.1

Fair Value Measurements (Narrative) (Details) $ in Millions	6 Months Ended
Fair Value Measurements (Narrative) (Details) $ in Millions	Jun. 30, 2026 USD ($)
Fair Value Disclosures [Abstract]
Impairment charge	$ 28.9
Fair value of one of the investments	0.0
Fair value of the other investment	1.6
Unrealized gains on investments	7.6
Fair value of these investments	$ 27.7

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References + Details

Guarantees	6 Months Ended
Guarantees	Jun. 30, 2026
Guarantees [Abstract]
Guarantees	Guarantees Mutual Offset Agreement. CME and Singapore Exchange Limited (SGX) maintain a mutual offset agreement with a current term through April 2027. This agreement enables market participants to open a futures position on one exchange and liquidate it on the other. The term of the agreement will automatically renew for a two-year period after April 2027 unless either party provides advance notice of their intent to terminate. CME can maintain collateral in the form of irrevocable, standby letters of credit. At June 30, 2026, CME was contingently liable to SGX on letters of credit totaling $400.0 million. CME also maintains a $350.0 million line of credit to meet its obligations under this agreement. Regardless of the collateral, CME guarantees all cleared transactions submitted through SGX and would initiate procedures designed to satisfy these financial obligations in the event of a default, such as the use of performance bonds and guaranty fund contributions of the defaulting clearing firm. Management has assessed the fair value of the company’s guarantee liability under this mutual offset agreement by taking the following factors into consideration: the design and operations of the clearing risk management process, the financial safeguard packages in place, historical evidence of default by a clearing firm and the estimated probability of potential payouts by the clearing house. Based on the assessment performed, management estimates the guarantee liability to be nominal and therefore has not recorded any liability at June 30, 2026 and December 31, 2025. Family Farmer and Rancher Protection Fund. In 2012, the company established the Family Farmer and Rancher Protection Fund (the Fund). The Fund is designed to provide payments, up to certain maximum levels, to family farmers, ranchers and other agricultural industry participants who use the company’s agricultural commodity products and who suffer losses to their segregated account balances due to their CME clearing firm becoming insolvent. Under the terms of the Fund, farmers and ranchers are eligible for up to $25,000 per participant. Farming and ranching cooperatives are eligible for up to $100,000 per cooperative. The Fund was established with a maximum of $100.0 million available for distribution to participants. Since its establishment, the Fund has made payments of approximately $2.0 million, which leaves $98.0 million available for future claims. If, at any time, payments due to participants were to exceed the amount remaining in the Fund, payments would be pro-rated. Clearing firms and customers must register with the company in advance and provide certain documentation in order to substantiate their eligibility. The company believes that its guarantee liability is nominal and therefore has not recorded any liability at June 30, 2026 and December 31, 2025.

- Definition

The entire disclosure for each guarantee obligation, or each group of similar guarantee obligations, including (a) the nature of the guarantee, including its term, how it arose, and the events or circumstances that would require the guarantor to perform under the guarantee; (b) the maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee; (c) the current carrying amount of the liability, if any, for the guarantor's obligations under the guarantee; and (d) the nature of any recourse provisions under the guarantee, and any assets held either as collateral or by third parties, and any relevant related party disclosure. Excludes disclosures about product warranties.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 235
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.9-06)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477314/942-235-S99-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-4

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-4

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)(5)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-4

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-4

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-4

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-4

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-4

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/460/tableOfContent

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-4

+ Details

Leases (Schedule of Supplemental Balance Sheet) (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Leases [Abstract]
Operating lease right-of-use assets	$ 334.8	$ 210.3
Operating lease liabilities:
Other current liabilities	54.8	46.8
Other liabilities	343.2	237.4
Total operating lease liabilities	$ 398.0	$ 284.2
Weighted average remaining lease term (in months)	104 months	99 months
Weighted average discount rate	4.40%	4.10%
Finance lease right-of-use assets	$ 41.2	$ 45.5
Finance lease liabilities:
Other current liabilities	9.1	9.0
Other liabilities	37.2	41.7
Total finance lease liabilities	$ 46.3	$ 50.7
Weighted average remaining lease term (in months)	57 months	63 months
Weighted average discount rate	3.50%	3.50%

Earnings Per Share (Schedule of Earnings Per Share Calculation) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Earnings Per Share [Abstract]
Net Income	$ 1,041.8	$ 1,025.1	$ 2,196.1	$ 1,981.3
Less: preferred stock dividends	0.0	(5.7)	0.0	(11.5)
Add: overdistributed earnings allocated to preferred stock	0.0	0.0	4.3	0.0
Less: undistributed earnings allocated to preferred stock	0.0	(7.2)	0.0	(13.4)
Net Income Attributable to Common Shareholders of CME Group - Basic	1,041.8	1,012.2	2,200.4	1,956.4
Less: overdistributed earnings allocated to preferred stock	0.0	0.0	(4.3)	0.0
Net Income Attributable to Common Shareholders of CME Group - Diluted	$ 1,041.8	$ 1,012.2	$ 2,196.1	$ 1,956.4
Weighted Average Number of Common Shares:
Basic (in shares)	360,684	359,658	360,005	359,636
Effect of restricted stock and performance shares (in shares)	598	697	632	661
Effect of convertible preferred shares (in shares)	0	0	1,596	0
Diluted (in shares)	361,282	360,355	362,233	360,297
Earnings per Common Share Attributable to Common Shareholders of CME Group:
Earnings per common share, basic (in dollars per share)	$ 2.89	$ 2.81	$ 6.11	$ 5.44
Earnings per common share, diluted (in dollars per share)	$ 2.88	$ 2.81	$ 6.06	$ 5.43

Earnings Per Share (Narrative) (Details) shares in Millions	6 Months Ended
Earnings Per Share (Narrative) (Details) shares in Millions	Jun. 30, 2026 shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Conversion ratio	1
Common Class A
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Conversion of Series G preferred stock to Class A common stock (in shares)	4.6

Leases

6 Months Ended

Jun. 30, 2026

Leases [Abstract]

Leases

The company has operating leases for corporate offices. The operating leases have remaining lease terms of up to 12 years, some of which include options to extend or renew the leases for up to an additional five years, and some of which include options to early terminate the leases in less than 12 months. Management evaluates whether these options are exercisable at least quarterly in order to determine whether the contract term must be reassessed. For a small number of the leases, primarily

the international locations, management’s approach is to enter into short-term leases for a lease term of 12 months or less in order to provide for greater flexibility in the local environment. For certain office spaces, the company has entered into arrangements to sublease excess space to third parties, while the original lease contract remains in effect with the landlord.

The company also has one finance lease, which is related to the sale of our data center in 2016. In connection with the sale, the company leased back a portion of the property. The transaction was recognized under the financing method and not as a sale leaseback arrangement.

The right-of-use lease asset is recorded within other assets, and the present value of the lease liability is recorded within other liabilities (segregated between short term and long term) on the consolidated balance sheets. The discount rate applied to the lease payments represents the company’s incremental borrowing rate.

The components of lease costs were as follows:


	Quarter Ended June 30,				Six Months Ended June 30,
(in millions)	2026		2025		2026		2025
Operating lease expense:
Operating lease cost	$	13.6	$	4.1	$	25.5	$	13.8
Short-term lease cost	0.1		0.1		0.2		0.2
Total operating lease expense included in other expense	$	13.7	$	4.2	$	25.7	$	14.0

Finance lease expense:
Interest expense	$	0.5	$	0.5	$	0.9	$	1.0
Depreciation expense	2.1		2.1		4.3		4.3
Total finance lease expense	$	2.6	$	2.6	$	5.2	$	5.3

Sublease revenue included in other revenue	$	3.9	$	3.3	$	7.8	$	6.2

Supplemental cash flow information related to leases was as follows:


	Quarter Ended June 30,				Six Months Ended June 30,
(in millions)	2026		2025		2026		2025
Cash outflows for operating leases	$	15.8	$	15.2	$	29.9	$	30.3
Cash outflows for finance lease	4.4		4.3		8.8		8.7

Supplemental balance sheet information related to leases was as follows:

Operating leases


(in millions)	June 30, 2026			December 31, 2025
Operating lease right-of-use assets	$	334.8		$	210.3

Operating lease liabilities:
Other current liabilities	$	54.8		$	46.8
Other liabilities	343.2			237.4
Total operating lease liabilities	$	398.0		$	284.2



Weighted average remaining lease term (in months)	104			99
Weighted average discount rate	4.4		%	4.1		%

Finance lease


(in millions)	June 30, 2026			December 31, 2025
Finance lease right-of-use assets	$	41.2		$	45.5

Finance lease liabilities:
Other current liabilities	$	9.1		$	9.0
Other liabilities	37.2			41.7
Total finance lease liabilities	$	46.3		$	50.7

Weighted average remaining lease term (in months)	57			63
Weighted average discount rate	3.5		%	3.5		%

Future minimum lease payments were as follows as of June 30, 2026 for operating and finance leases:


(in millions)	Operating Leases
Remainder of 2026	$	36.8
2027	66.2
2028	60.8
2029	50.5
2030	49.8
2031	48.2
Thereafter	163.6
Total lease payments	475.9
Less: imputed interest	(77.9)
Present value of lease liability	$	398.0


(in millions)	Finance Leases
Remainder of 2026	$	8.8
2027	17.8
2028	17.9
2029	18.1
2030	18.3
2031	4.6
Thereafter	—
Total lease payments	85.5
Less: imputed interest	(39.2)
Present value of lease liability	$	46.3

Leases

The components of lease costs were as follows:


	Quarter Ended June 30,				Six Months Ended June 30,
(in millions)	2026		2025		2026		2025
Operating lease expense:
Operating lease cost	$	13.6	$	4.1	$	25.5	$	13.8
Short-term lease cost	0.1		0.1		0.2		0.2
Total operating lease expense included in other expense	$	13.7	$	4.2	$	25.7	$	14.0

Finance lease expense:
Interest expense	$	0.5	$	0.5	$	0.9	$	1.0
Depreciation expense	2.1		2.1		4.3		4.3
Total finance lease expense	$	2.6	$	2.6	$	5.2	$	5.3

Sublease revenue included in other revenue	$	3.9	$	3.3	$	7.8	$	6.2

Supplemental cash flow information related to leases was as follows:


	Quarter Ended June 30,				Six Months Ended June 30,
(in millions)	2026		2025		2026		2025
Cash outflows for operating leases	$	15.8	$	15.2	$	29.9	$	30.3
Cash outflows for finance lease	4.4		4.3		8.8		8.7

Supplemental balance sheet information related to leases was as follows:

Operating leases


(in millions)	June 30, 2026			December 31, 2025
Operating lease right-of-use assets	$	334.8		$	210.3

Operating lease liabilities:
Other current liabilities	$	54.8		$	46.8
Other liabilities	343.2			237.4
Total operating lease liabilities	$	398.0		$	284.2



Weighted average remaining lease term (in months)	104			99
Weighted average discount rate	4.4		%	4.1		%

Finance lease


(in millions)	June 30, 2026			December 31, 2025
Finance lease right-of-use assets	$	41.2		$	45.5

Finance lease liabilities:
Other current liabilities	$	9.1		$	9.0
Other liabilities	37.2			41.7
Total finance lease liabilities	$	46.3		$	50.7

Weighted average remaining lease term (in months)	57			63
Weighted average discount rate	3.5		%	3.5		%

Future minimum lease payments were as follows as of June 30, 2026 for operating and finance leases:


(in millions)	Operating Leases
Remainder of 2026	$	36.8
2027	66.2
2028	60.8
2029	50.5
2030	49.8
2031	48.2
Thereafter	163.6
Total lease payments	475.9
Less: imputed interest	(77.9)
Present value of lease liability	$	398.0


(in millions)	Finance Leases
Remainder of 2026	$	8.8
2027	17.8
2028	17.9
2029	18.1
2030	18.3
2031	4.6
Thereafter	—
Total lease payments	85.5
Less: imputed interest	(39.2)
Present value of lease liability	$	46.3

COVER - shares	6 Months Ended
COVER - shares	Jun. 30, 2026	Jul. 08, 2026
Statement [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2026
Document Transition Report	false
Entity File Number	001-31553
Entity Registrant Name	CME GROUP INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	36-4459170
Entity Address, Street Address	20 South Wacker Drive
Entity Address, City	Chicago
Entity Address, State	IL
Entity Address, Postal Zip Code	60606
City Area Code	312
Local Phone Number	930-1000
Title of each class	Class A Common Stock
Trading symbol	CME
Name of each exchange on which registered	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0001156375
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2026
Document Fiscal Period Focus	Q2
Amendment Flag	false
Common Class A
Statement [Line Items]
Entity Common Stock, Shares Outstanding		359,576,125
Class B Common Stock, Class B-1
Statement [Line Items]
Entity Common Stock, Shares Outstanding		625
Class B Common Stock, Class B-2
Statement [Line Items]
Entity Common Stock, Shares Outstanding		813
Class B Common Stock, Class B-3
Statement [Line Items]
Entity Common Stock, Shares Outstanding		1,287
Class B Common Stock, Class B-4
Statement [Line Items]
Entity Common Stock, Shares Outstanding		413

Fair Value Measurements (Schedule of Financial Instruments Measured at Fair Value) (Details) $ in Millions	Jun. 30, 2026 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities:	$ 131.4
Total Assets at Fair Value	131.4
Corporate debt securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities:	6.8
Mutual funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities:	123.6
Equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities:	1.0
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities:	131.4
Total Assets at Fair Value	131.4
Level 1 \| Corporate debt securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities:	6.8
Level 1 \| Mutual funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities:	123.6
Level 1 \| Equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities:	1.0
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities:	0.0
Total Assets at Fair Value	0.0
Level 2 \| Corporate debt securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities:	0.0
Level 2 \| Mutual funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities:	0.0
Level 2 \| Equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities:	0.0
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities:	0.0
Total Assets at Fair Value	0.0
Level 3 \| Corporate debt securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities:	0.0
Level 3 \| Mutual funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities:	0.0
Level 3 \| Equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities:	$ 0.0

Fair Value Measurements

6 Months Ended

Jun. 30, 2026

Fair Value Disclosures [Abstract]

Fair Value Measurements

The company uses a three-level classification hierarchy of fair value measurements for disclosure purposes:

•Level 1 inputs, which are considered the most reliable evidence of fair value, consist of quoted prices (unadjusted) for identical assets or liabilities in active markets.

•Level 2 inputs consist of observable market data, such as quoted prices for similar assets and liabilities in active markets, or inputs other than quoted prices that are directly observable.

•Level 3 inputs consist of unobservable inputs which are derived and cannot be corroborated by market data or other entity-specific inputs.

The company’s level 1 assets generally include investments in publicly traded mutual funds, equity securities and corporate debt securities with quoted market prices. In general, the company uses quoted prices in active markets for identical assets to determine the fair value of marketable securities.

The company’s level 2 assets and liabilities generally consist of long-term debt notes. The fair values of the long-term debt notes were based on quoted market prices in an inactive market.

The company’s level 3 assets and liabilities include certain investments that were adjusted to fair value.

Recurring Fair Value Measurements. Financial assets and liabilities recorded at fair value on the consolidated balance sheet as of June 30, 2026 were classified in their entirety based on the lowest level of input that was significant to each asset and liability’s fair value measurement. The following table presents financial instruments measured at fair value on a recurring basis:


	June 30, 2026
(in millions)	Level 1		Level 2		Level 3		Total
Assets at Fair Value:
Marketable securities:
Corporate debt securities	$	6.8	$	—	$	—	$	6.8

Mutual funds	123.6		—		—		123.6
Equity securities	1.0		—		—		1.0

Total Marketable Securities	131.4		—		—		131.4





Total Assets at Fair Value	$	131.4	$	—	$	—	$	131.4

Non-Recurring Fair Value Measurements. The company recognized impairment charges of $28.9 million related to two of its privately-held equity investments during the first six months of 2026. The fair value of one of the investments was estimated to be zero at the impairment date and the fair value of the other investment was estimated to be $1.6 million at the impairment date. The company also recognized unrealized gains on investments of $7.6 million on equity investments without readily determinable fair values during the first six months of 2026. The fair values of these investments were estimated to be $27.7 million at June 30, 2026. This fair value assessment was based on quantitative factors, including observable price changes. The fair value measurement of these investments are considered level 3 and non-recurring. These investments are included in other assets on the consolidated balance sheet.

Fair Values of Debt Notes. The following presents the estimated fair values of long-term debt notes, which are carried at amortized cost on the consolidated balance sheets. The fair values below are classified as level 2 under the fair value hierarchy and were estimated using quoted market prices in inactive markets.

At June 30, 2026, the fair values were as follows:


(in millions)	Fair Value		Level

$500.0 million fixed rate notes due June 2028	$	495.2	Level 2
$750.0 million fixed rate notes due March 2030	748.4		Level 2
$750.0 million fixed rate notes due March 2032	677.4		Level 2
$750.0 million fixed rate notes due September 2043	749.1		Level 2
$700.0 million fixed rate notes due June 2048	584.7		Level 2

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

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+ Details

Fair Value Measurements (Debt Instruments) (Details) $ in Millions	Jun. 30, 2026 USD ($)
$500.0 million Fixed Rate Notes Due June 2028
Statement [Line Items]
Debt instrument, face amount	$ 500.0
$750.0 million Fixed Rate Notes Due March 2030
Statement [Line Items]
Debt instrument, face amount	750.0
$750.0 million Fixed Rate Notes Due March 2032
Statement [Line Items]
Debt instrument, face amount	750.0
$750.0 million Fixed Rate Notes Due September 2043
Statement [Line Items]
Debt instrument, face amount	750.0
$700.0 million Fixed Rate Notes Due June 2048
Statement [Line Items]
Debt instrument, face amount	700.0
Level 2 \| $500.0 million Fixed Rate Notes Due June 2028
Statement [Line Items]
Fair Value	495.2
Level 2 \| $750.0 million Fixed Rate Notes Due March 2030
Statement [Line Items]
Fair Value	748.4
Level 2 \| $750.0 million Fixed Rate Notes Due March 2032
Statement [Line Items]
Fair Value	677.4
Level 2 \| $750.0 million Fixed Rate Notes Due September 2043
Statement [Line Items]
Fair Value	749.1
Level 2 \| $700.0 million Fixed Rate Notes Due June 2048
Statement [Line Items]
Fair Value	$ 584.7

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Jun. 30, 2026 shares
Trading Arrangements, by Individual
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Jonathan Marcus [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	On June 1, 2026, Jonathan Marcus, Senior Managing Director and General Counsel, adopted a trading plan intended to satisfy the affirmative defense of Rule 10b5-1(c). Under the terms of the plan, Mr. Marcus is scheduled to sell an aggregate of up to 1,294 shares of the company's Class A common stock, net of shares withheld to cover taxes, arising from restricted stock awards vesting on September 15, 2026 and March 15, 2027. The plan expires on the earlier of March 23, 2027 or the completion of all authorized transactions under the plan.
Name	Jonathan Marcus
Title	Senior Managing Director and General Counsel
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	June 1, 2026
Expiration Date	March 15, 2027
Arrangement Duration	181 days
Aggregate Available	1,294

Leases (Schedule of Components of Lease Costs) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Operating lease expense:
Operating lease cost	$ 13.6	$ 4.1	$ 25.5	$ 13.8
Short-term lease cost	0.1	0.1	0.2	0.2
Total operating lease expense included in other expense	13.7	4.2	25.7	14.0
Finance lease expense:
Interest expense	0.5	0.5	0.9	1.0
Depreciation expense	2.1	2.1	4.3	4.3
Total finance lease expense	2.6	2.6	5.2	5.3
Sublease revenue included in other revenue	$ 3.9	$ 3.3	$ 7.8	$ 6.2

Leases (Schedule of Future Minimum Operating Lease Payments) (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Leases [Abstract]
Remainder of 2026	$ 36.8
2027	66.2
2028	60.8
2029	50.5
2030	49.8
2031	48.2
Thereafter	163.6
Total lease payments	475.9
Less: imputed interest	(77.9)
Total operating lease liabilities	$ 398.0	$ 284.2

Earnings Per Share

6 Months Ended

Jun. 30, 2026

Earnings Per Share [Abstract]

Earnings Per Share

The company calculates basic earnings per share for the quarter ended June 30, 2026 by dividing net income by the weighted average number of shares of all classes of common stock outstanding for each reporting period. Diluted earnings per share reflects the increase in shares using the treasury stock method to reflect the impact of an equivalent number of shares of common stock if restricted stock awards were converted into common stock. The company uses the two-class method for calculating basic EPS and the if-converted method for diluted EPS for the six months ended June 30, 2026. This reflects the Series G preferred stock’s status as participating securities until their 1:1 conversion into 4.6 million Class A common shares on March 5, 2026. Under the two-class method, undistributed or overdistributed earnings are allocated to common stock and participating securities according to their respective rights in undistributed or overdistributed earnings, as if all the earnings for the period had been distributed. Basic earnings per common share is computed by dividing the net income attributable to common shareholders by the weighted average number of common shares outstanding during the period. Net income attributable to common shareholders is reduced for preferred stock dividends earned during the period. Preferred stock also receives a proportionate allocation of undistributed or overdistributed earnings for the period because the shares of the Series G preferred stock have a contractual obligation to share in profits and losses of the company. Diluted earnings per share is computed using the if-converted method for the Series G preferred stock which assumes the conversion of all preferred shares into common shares at the beginning of the period. Accordingly, net income attributable to common shareholders is adjusted to add back the dividends and undistributed or overdistributed earnings previously allocated to the preferred stock, and the weighted average number of common shares outstanding is increased by the number of shares that would have been issued upon conversion of the preferred stock as of the beginning of the period plus potentially dilutive common shares. Anti-dilutive stock awards were as follows for the periods presented:


	Quarter Ended June 30,		Six Months Ended June 30,
(in thousands)	2026	2025	2026	2025

Stock awards	34	—	34	47
Total	34	—	34	47

The following table presents the earnings per share calculation for the periods presented:


	Quarter Ended June 30,				Six Months Ended June 30,
	2026		2025		2026		2025
Net Income (in millions)	$	1,041.8	$	1,025.1	$	2,196.1	$	1,981.3
Less: preferred stock dividends	—		(5.7)		—		(11.5)
Add: overdistributed earnings allocated to preferred stock	—		—		4.3		—
Less: undistributed earnings allocated to preferred stock	—		(7.2)		—		(13.4)
Net Income Attributable to Common Shareholders of CME Group - Basic	$	1,041.8	$	1,012.2	$	2,200.4	$	1,956.4
Less: overdistributed earnings allocated to preferred stock	—		—		(4.3)		—
Net Income Attributable to Common Shareholders of CME Group - Diluted	$	1,041.8	$	1,012.2	$	2,196.1	$	1,956.4

Weighted Average Number of Common Shares (in thousands):
Basic	360,684		359,658		360,005		359,636
Effect of restricted stock and performance shares	598		697		632		661
Effect of convertible preferred shares	—		—		1,596		—
Diluted	361,282		360,355		362,233		360,297
Earnings per Common Share Attributable to Common Shareholders of CME Group:
Basic	$	2.89	$	2.81	$	6.11	$	5.44
Diluted	2.88		2.81		6.06		5.43

Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2026

Earnings Per Share [Abstract]

Schedule of Anti-dilutive Stock Awards

Anti-dilutive stock awards were as follows for the periods presented:


	Quarter Ended June 30,		Six Months Ended June 30,
(in thousands)	2026	2025	2026	2025

Stock awards	34	—	34	47
Total	34	—	34	47

Schedule of Earnings Per Share Calculation

The following table presents the earnings per share calculation for the periods presented:


	Quarter Ended June 30,				Six Months Ended June 30,
	2026		2025		2026		2025
Net Income (in millions)	$	1,041.8	$	1,025.1	$	2,196.1	$	1,981.3
Less: preferred stock dividends	—		(5.7)		—		(11.5)
Add: overdistributed earnings allocated to preferred stock	—		—		4.3		—
Less: undistributed earnings allocated to preferred stock	—		(7.2)		—		(13.4)
Net Income Attributable to Common Shareholders of CME Group - Basic	$	1,041.8	$	1,012.2	$	2,200.4	$	1,956.4
Less: overdistributed earnings allocated to preferred stock	—		—		(4.3)		—
Net Income Attributable to Common Shareholders of CME Group - Diluted	$	1,041.8	$	1,012.2	$	2,196.1	$	1,956.4

Weighted Average Number of Common Shares (in thousands):
Basic	360,684		359,658		360,005		359,636
Effect of restricted stock and performance shares	598		697		632		661
Effect of convertible preferred shares	—		—		1,596		—
Diluted	361,282		360,355		362,233		360,297
Earnings per Common Share Attributable to Common Shareholders of CME Group:
Basic	$	2.89	$	2.81	$	6.11	$	5.44
Diluted	2.88		2.81		6.06		5.43

Performance Bonds and Guaranty Fund Contributions	6 Months Ended
Performance Bonds and Guaranty Fund Contributions	Jun. 30, 2026
Performance Bonds and Guaranty Fund Contributions [Abstract]
Performance Bonds and Guaranty Fund Contributions	Performance Bonds and Guaranty Fund Contributions Performance Bonds and Guaranty Fund Contribution Reinvestment. CME reinvests cash performance bonds and guaranty fund contributions and distributes a portion of the interest earned back to the clearing firms. The reinvestment of cash can include certain commercial and central bank deposits, government securities, reverse repurchase agreements, and money market funds. CME has been designated as a systemically important financial market utility by the Financial Stability Oversight Council and is authorized to maintain cash accounts at the Federal Reserve Bank of Chicago. At June 30, 2026, CME maintained $138.5 billion within the cash account at the Federal Reserve Bank of Chicago. The cash deposit at the Federal Reserve Bank of Chicago is included within performance bonds and guaranty fund contributions on the consolidated balance sheets. Cash performance bonds and guaranty fund contributions are included as restricted cash and restricted cash equivalents on the consolidated statements of cash flows. In the second quarter and first six months of 2026, earnings from cash performance bond and guaranty fund contributions were $1,388.8 million and $2,759.8 million, respectively, compared with $1,487.6 million and $2,361.2 million in the second quarter and first six months of 2025. In the second quarter and first six months of of 2026, expenses related to the distribution of interest earned on collateral reinvestments were $1,265.7 million and $2,514.9 million, respectively, compared with $1,374.5 million and $2,179.3 million in the second quarter and first six months of 2025. The earnings from cash performance bonds and guaranty fund contributions are included in investment income and the expense related to the distribution of interest earned is included in other non-operating income (expense) on the consolidated statements of income. Clearing House Contract Settlement. The clearing house marks-to-market open positions at least once each business day (twice each business day for all futures and options contracts). Based on values derived from the mark-to-market process, the clearing house requires payments from clearing firms whose positions have lost value and makes payments to clearing firms whose positions have gained value. Under the extremely unlikely scenario of simultaneous default by every clearing firm who has open positions with unrealized losses, the maximum exposure at the time of default related to futures and options on futures positions would be one half of a business day of changes in fair value of all open positions, before considering the clearing house's ability to access defaulting clearing firms' collateral deposits. For cleared interest rate swap contracts, the maximum exposure at the time of default related to the clearing house's guarantee would be one full business day of changes in fair value of all open positions, before considering the clearing house's ability to access defaulting clearing firms' collateral. During the first six months of 2026, the clearing house transferred an average of approximately $8.7 billion a day through its clearing systems for settlement from clearing firms whose positions had lost value to clearing firms whose positions had gained value. The clearing house reduces its guarantee exposure through initial and maintenance performance bond requirements and mandatory guaranty fund contributions. Management has assessed the fair value of the company’s settlement guarantee liability by taking the following factors into consideration: the design and operations of the clearing risk management process, the financial safeguard packages in place, historical evidence of default by a clearing firm and the estimated probability of potential payouts by the clearing house. Based on the assessment performed, management estimates the guarantee liability to be nominal and therefore has not recorded any liability at June 30, 2026 and December 31, 2025. The company does not have a history of significant losses recognized on performance bond collateral as posted by our clearing firms, and management currently does not anticipate any future credit losses on its performance bond assets. Accordingly, the company has not provided an allowance for credit losses on these performance bond deposits, nor has it recorded any liabilities to reflect an allowance for credit losses related to our off-balance sheet credit exposures and guarantees.

Earnings Per Share (Schedule of Anti-Dilutive Stock Awards) (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	34	0	34	47
Stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	34	0	34	47

Segment Reporting (Details)	6 Months Ended
Segment Reporting (Details)	Jun. 30, 2026 segment
Segment Reporting [Abstract]
Number of reportable segments	1
Number of operating segments	1

CONSOLIDATED BALANCE SHEETS - USD ($) shares in Thousands, $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Current Assets:
Cash and cash equivalents	$ 2,144.2	$ 4,416.9
Marketable securities	131.4	125.0
Accounts receivable, net of allowance of $9.1 and $10.0	753.1	639.2
Other current assets (includes $4.4 and $6.5 in restricted cash)	491.7	522.1
Performance bonds and guaranty fund contributions	158,110.7	159,656.1
Total current assets	161,631.1	165,359.3
Property, net of accumulated depreciation and amortization of $993.7 and $1,005.7	351.2	362.7
Intangible assets—trading products	17,175.3	17,175.3
Intangible assets—other, net	2,494.6	2,610.7
Goodwill	10,505.8	10,514.7
Other assets	2,518.6	2,401.5
Total Assets	194,676.6	198,424.2
Current Liabilities:
Accounts payable	68.0	71.8
Other current liabilities	538.6	568.8
Performance bonds and guaranty fund contributions	158,110.7	159,656.1
Total current liabilities	158,717.3	160,296.7
Long-term debt	3,424.2	3,422.3
Deferred income tax liabilities, net	5,220.9	5,242.2
Other liabilities	793.8	734.8
Total Liabilities	168,156.2	169,696.0
Shareholders' Equity:
Preferred stock, $0.01 par value, 10,000 shares authorized at June 30, 2026 and December 31, 2025; no shares issued and outstanding as of June 30, 2026 and 4,584 issued and outstanding as of December 31, 2025	0.0	0.0
Additional paid-in capital	21,004.4	22,209.5
Retained earnings	5,457.5	6,433.2
Accumulated other comprehensive income (loss)	54.9	81.9
Total CME Group Shareholders’ Equity	26,520.4	28,728.2
Total Liabilities and Equity	$ 194,676.6	$ 198,424.2
Preferred stock, shares outstanding (in shares)	0	4,584
Preferred stock, shares issued (in shares)	0	4,584
Common Class A
Shareholders' Equity:
Common stock	$ 3.6	$ 3.6
Common Class B
Shareholders' Equity:
Common stock	$ 0.0	$ 0.0

CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Revenues
Total Revenues	$ 1,706.2	$ 1,692.0	$ 3,586.3	$ 3,334.3
Expenses
Compensation and benefits	233.5	221.6	456.5	428.3
Technology	83.3	70.9	159.9	136.6
Professional fees and outside services	29.1	37.4	57.3	65.9
Amortization of purchased intangibles	56.0	56.1	112.1	111.3
Depreciation and amortization	28.2	27.3	55.4	54.6
Licensing and other fee agreements	109.1	96.2	215.9	192.8
Other	59.9	53.2	112.4	107.5
Total Expenses	599.1	562.7	1,169.5	1,097.0
Operating Income	1,107.1	1,129.3	2,416.8	2,237.3
Non-Operating Income (Expense)
Investment income	1,429.7	1,518.4	2,819.0	2,411.1
Interest and other borrowing costs	(43.6)	(44.0)	(87.2)	(85.7)
Equity in net earnings of unconsolidated subsidiaries	97.7	99.0	200.1	187.2
Other non-operating income (expense)	(1,263.2)	(1,372.4)	(2,510.1)	(2,174.8)
Total Non-Operating Income (Expense)	220.6	201.0	421.8	337.8
Income before Income Taxes	1,327.7	1,330.3	2,838.6	2,575.1
Income tax provision	285.9	305.2	642.5	593.8
Net Income	$ 1,041.8	$ 1,025.1	$ 2,196.1	$ 1,981.3
Earnings per Share Attributable to Common Shareholders of CME Group:
Basic (in dollars per share)	$ 2.89	$ 2.81	$ 6.11	$ 5.44
Diluted (in dollars per share)	$ 2.88	$ 2.81	$ 6.06	$ 5.43
Weighted Average Number of Common Shares:
Basic (in shares)	360,684	359,658	360,005	359,636
Diluted (in shares)	361,282	360,355	362,233	360,297
Clearing and transaction fees
Revenues
Total Revenues	$ 1,352.5	$ 1,388.0	$ 2,895.1	$ 2,725.3
Market data and information services
Revenues
Total Revenues	238.1	198.1	462.2	392.6
Other
Revenues
Total Revenues	$ 115.6	$ 105.9	$ 229.0	$ 216.4

Contingencies	6 Months Ended
Contingencies	Jun. 30, 2026
Loss Contingency [Abstract]
Contingencies	Contingencies Legal and Regulatory Matters. In the normal course of business, the company discusses matters with its regulators raised during regulatory examinations or otherwise subject to their inquiry and oversight. These matters could result in censures, fines, penalties or other sanctions. Management believes the outcome of any resulting actions will not have a material impact on the company's consolidated financial position or results of operations. However, the company is unable to predict the outcome or the timing of the ultimate resolution of these matters, or the potential fines, penalties or injunctive or other equitable relief, if any, that may result from these matters. A putative class action complaint was filed January 15, 2014 in the Circuit Court of Cook County, Chancery Division, against CME Group Inc. and the Board of Trade of the City of Chicago, Inc. The plaintiffs, certain Class B shareholders of CME Group and Class B members of CBOT, allege breach of contract and breach of the implied covenant of good faith and fair dealing for violations of their core rights granted in the defendants’ respective Certificates of Incorporation. On December 2, 2021, the court granted the plaintiffs’ motion for certification of a damages-only class. In early 2024, the defendants moved for summary judgment on all claims. On April 16, 2025, the court granted the motion in part and denied the motion in part, and set the remaining claims for a jury trial. After a three week trial, on July 25, 2025, the jury returned a unanimous verdict in favor of the defendants on all counts. On June 15, 2026, the court denied the plaintiffs' post-trial motions. The plaintiffs have filed a notice of appeal. In addition, the company is a defendant in, and has potential for, various other legal proceedings arising from its regular business activities. While the ultimate results of such proceedings against the company cannot be predicted with certainty, the company believes that the resolution of any of these matters on an individual or aggregate basis will not have a material impact on its consolidated financial position or results of operations. No accrual was required for contingent legal and regulatory matters as none were probable and estimable as of June 30, 2026 and December 31, 2025. Intellectual Property Indemnifications. Certain agreements with customers and other third parties related to accessing the CME Group platforms, utilizing market data services and licensing CME SPAN and SPAN 2 software may contain indemnifications from intellectual property claims that may be made against them as a result of their use of the applicable products and/or services. The potential future claims relating to these indemnifications cannot be estimated and therefore no liability has been recorded.

- Definition

The entire disclosure for loss and gain contingencies. Describes any existing condition, situation, or set of circumstances involving uncertainty as of the balance sheet date (or prior to issuance of the financial statements) as to a probable or reasonably possible loss incurred by an entity that will ultimately be resolved when one or more future events occur or fail to occur, and typically discloses the amount of loss recorded or a range of possible loss, or an assertion that no reasonable estimate can be made.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 235
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.9-06)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477314/942-235-S99-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
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-Name Accounting Standards Codification
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-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-4

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
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-Paragraph 3
-Subparagraph (SX 210.12-04(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 50
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-Subparagraph (a)
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 1
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
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-Paragraph 1
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 9
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-URI https://asc.fasb.org/1943274/2147483076/450-20-50-9

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/450-30/tableOfContent

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483049/450-30-50-1

+ Details

Intangible Assets and Goodwill

6 Months Ended

Jun. 30, 2026

Intangible Asset, Goodwill and Other [Abstract]

Intangible Assets and Goodwill

Intangible assets consisted of the following at June 30, 2026 and December 31, 2025:


	June 30, 2026				December 31, 2025
(in millions)	Assigned Value		Accumulated Amortization		Net Book Value		Assigned Value		Accumulated Amortization		Net Book Value
Amortizable Intangible Assets:
Clearing firm, market data and other customer relationships	$	4,695.3	$	(2,661.8)	$	2,033.5	$	4,703.0	$	(2,557.5)	$	2,145.5

Technology-related intellectual property	62.5		(62.5)		—		62.5		(62.5)		—
Other	73.3		(62.2)		11.1		73.9		(58.7)		15.2
Total amortizable intangible assets	$	4,831.1	$	(2,786.5)	$	2,044.6	$	4,839.4	$	(2,678.7)	$	2,160.7

Indefinite-Lived Intangible Assets:
Trade names					450.0						450.0
Total intangible assets – other, net					$	2,494.6					$	2,610.7
Trading products (1)					$	17,175.3					$	17,175.3

(1)Trading products represent futures and options products acquired in our business combinations with CBOT Holdings, Inc., NYMEX Holdings, Inc. and The Board of Trade of Kansas City, Missouri, Inc. Clearing and transaction fees are generated through the trading of these products. These trading products, most of which have traded for decades, require authorization from the Commodity Futures Trading Commission (CFTC). Product authorizations from the CFTC have no term limits.

Total amortization expense for intangible assets was $56.0 million and $56.1 million for the quarters ended June 30, 2026 and 2025, respectively. Total amortization expense for intangible assets was $112.1 million and $111.3 million for the six months ended June 30, 2026 and 2025, respectively. During the six months ended June 30, 2026, the net book value of amortizable intangible assets included $4.1 million of foreign currency translation for the period.

As of June 30, 2026, the future estimated amortization expense related to amortizable intangible assets is expected to be as follows:


(in millions)	Amortization Expense
Remainder of 2026	$	111.1
2027	220.9
2028	214.4
2029	214.4
2030	214.4
2031	214.4
Thereafter	855.0

Goodwill activity consisted of the following for the periods ended June 30, 2026 and December 31, 2025:


(in millions)	Goodwill
Balance at December 31, 2024	$	10,486.9
Foreign currency translation	27.8
Balance at December 31, 2025	10,514.7
Foreign currency translation	(8.9)
Balance at June 30, 2026	$	10,505.8

Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2026
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events The company has evaluated subsequent events through the date the financial statements were issued. The company has determined that there were no subsequent events that met the requirement for recognition or disclosure in the consolidated financial statements.

Intangible Assets and Goodwill (Schedule of Components of Goodwill) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2026	Dec. 31, 2025
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 10,514.7	$ 10,486.9
Foreign currency translation	(8.9)	27.8
Goodwill, ending balance	$ 10,505.8	$ 10,514.7

- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

+ References

+ Details

Performance Bonds and Guaranty Fund Contributions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025	Dec. 31, 2024
Guarantor Obligations [Line Items]
Cash account at the Federal Reserve Bank	$ 160,259.3	$ 144,145.8	$ 160,259.3	$ 144,145.8	$ 164,079.5	$ 101,794.1
Revenues	1,706.2	1,692.0	3,586.3	3,334.3
Distribution of interest earned on collateral reinvestments	(1,263.2)	(1,372.4)	(2,510.1)	(2,174.8)
Average daily clearing settlement			8,700.0
Interest from Performance Bonds
Guarantor Obligations [Line Items]
Revenues	1,388.8	1,487.6	2,759.8	2,361.2
Expense related to Performance Bonds
Guarantor Obligations [Line Items]
Distribution of interest earned on collateral reinvestments	1,265.7	$ 1,374.5	2,514.9	$ 2,179.3
Federal Reserve Bank Advances
Guarantor Obligations [Line Items]
Cash account at the Federal Reserve Bank	$ 138,500.0		$ 138,500.0

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480070/505-10-S50-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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+ Details

Revenue Recognition

6 Months Ended

Jun. 30, 2026

Revenue Recognition [Abstract]

Revenue Recognition

The company generates revenue from customers from the following sources:

Clearing and transaction fees. Clearing and transaction fees include per-contract charges for trade matching, clearing, trading on the company's electronic trading platforms, portfolio reconciliation and compression services, risk mitigation, and other fees. Clearing and transaction fees are assessed upfront at the time of trade execution. As such, the company recognizes the majority of the fee revenue upon successful execution of the trade. The minimal remaining portion of the fee revenue related to settlement activities performed after trade execution is recognized over the short-term period that the contract is outstanding, based on management’s estimates of the average contract lifecycle. These estimates are based on various assumptions to approximate the amount of fee revenue to be attributed to services performed through contract settlement, expiration, or termination. For cleared trades, these assumptions include the average number of days that a contract remains in open interest, contract turnover, average revenue per day, and revenue remaining in open interest at the end of each period.

The nature of contracts gives rise to several types of variable consideration, including volume-based pricing tiers, customer incentives associated with market maker programs and other fee discounts. The company includes fee discounts and incentives in the estimated transaction price when there is a basis to reasonably estimate the amount of the fee reduction. These estimates are based on historical experience, anticipated performance, and best judgment at the time. Because of the company's certainty in estimating these amounts, they are included in the transaction price of contracts.

Market data and information services. Market data and information services represent revenue from the dissemination of market data to subscribers, distributors, and other third-party licensees of market data. Pricing for market data is primarily based on the number of reportable devices used as well as the number of subscribers enrolled under the arrangement. Fees for these services are generally billed monthly. Market data services are satisfied over time and revenue is recognized on a monthly basis as the customers receive and consume the benefit of the market data services. However, the company also maintains certain annual license arrangements with one-time upfront fees. The fees for annual licenses are initially recorded as a contract liability and recognized as revenue monthly over the term of the annual period.

Other. Other revenues include certain access and communication fees, fees for collateral management, equity membership subscription fees, and fees for trade order routing through agreements from various strategic relationships. Access and communication fees are charged to customers that utilize various telecommunications networks and communications services. Fees for these services are generally billed monthly and the associated fee revenue is recognized as billed. Collateral management fees are charged to clearing firms that have collateral on deposit with the clearing house to meet their minimum performance bond and guaranty fund obligations on the exchange. These fees are calculated based on daily collateral balances

and are billed monthly. This fee revenue is recognized monthly as billed as the customers receive and consume the benefits of the services. The company also has an equity membership program which provides equity members the option to pay a monthly subscription fee in satisfaction of their existing requirement to hold CME Group Class A common stock. Choosing to pay this fee in lieu of holding Class A shares is entirely voluntary and the client's choice. Fee revenue under this program is earned monthly as billed over the contractual term. Pricing for strategic relationships may be driven by customer levels and activity. There are fee arrangements which provide for monthly as well as quarterly payments in arrears. Revenue is recognized monthly for strategic relationship arrangements as the customers receive and consume the benefits of the services.

The following table represents a disaggregation of revenue from contracts with customers by product line for the quarters and six months ended June 30, 2026 and 2025:


	Quarter Ended June 30,				Six Months Ended June 30,
(in millions)	2026		2025		2026		2025
Interest rates	$	433.0	$	461.6	$	954.2	$	897.9
Equity indexes	324.0		301.6		639.6		605.8
Foreign exchange	49.8		52.4		106.6		105.8
Agricultural commodities	183.8		174.7		351.3		339.0
Energy	187.0		217.4		450.7		433.8
Metals	76.7		85.1		195.1		156.0
BrokerTec fixed income	40.1		37.1		80.3		72.9
EBS foreign exchange	33.8		37.5		70.2		72.7
Interest rate swap	24.3		20.6		47.1		41.4
Total clearing and transaction fees	1,352.5		1,388.0		2,895.1		2,725.3
Market data and information services	238.1		198.1		462.2		392.6
Other	115.6		105.9		229.0		216.4
Total revenues	$	1,706.2	$	1,692.0	$	3,586.3	$	3,334.3

Timing of Revenue Recognition
Services transferred at a point in time	$	1,323.4	$	1,361.7	$	2,840.4	$	2,670.8
Services transferred over time	377.3		324.7		734.6		652.9
One-time charges and miscellaneous revenues	5.5		5.6		11.3		10.6
Total revenues	$	1,706.2	$	1,692.0	$	3,586.3	$	3,334.3

The timing of revenue recognition, billings and cash collections results in billed accounts receivable, and customer advances and deposits (contract liabilities) on the consolidated balance sheets. Certain fees for transactions, annual licenses, and other revenue arrangements are billed upfront before revenue is recognized, which results in the recognition of contract liabilities. These liabilities are recognized on the consolidated balance sheets on a contract-by-contract basis upon commencement of services under the customer contract. These upfront customer payments are recognized as revenue over time as the obligations under the contracts are satisfied. Changes in the contract liability balances during the second quarter of 2026 were not materially impacted by any other factors. The balance of contract liabilities was $52.8 million and $16.7 million as of June 30, 2026 and December 31, 2025, respectively.

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

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+ Details

CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

Jun. 30, 2026

Jun. 30, 2025

Jun. 30, 2026

Jun. 30, 2025

Dec. 31, 2024

Statement [Line Items]

Cash dividends on common stock, per share (in dollars per share)

$ 1.30

$ 1.25

$ 8.75

$ 2.50

Repurchase of up to

$ 3,000.0

Average price (in dollars per share)

$ 273.14

$ 253.05

$ 280.87

$ 253.05

Repurchase of Class A common stock

$ 698.2

^[1]

$ 8.2

^[2]

$ 1,236.9

^[1]

$ 8.2

^[2]

Share repurchase program

1,500.0

3,000.0

1,500.0

3,000.0

Preferred Stock, Common Stock and Additional Paid-in Capital

Statement [Line Items]

Repurchase of Class A common stock

$ 700.0

$ 8.2

$ 1,200.0

$ 8.2

Common Class A

Statement [Line Items]

Shares of outstanding (in shares)

2,546,284

32,265

4,384,776

32,265

[1]

(1) In December 2024, the board of directors approved a share repurchase program (the Share Repurchase Program), which authorizes the repurchase of up to $3.0 billion of CME Group Class A common stock at prevailing market prices. During the three and six months ended June 30, 2026, 2,546,284 and 4,384,776 shares of outstanding Class A common stock were repurchased, respectively. The average price was $273.14 per share for a total of $0.7 billion (excluding excise tax) during the second quarter of 2026 and $280.87 per share for a total of $1.2 billion (excluding excise tax) for the first six months of 2026. The remaining aggregate amount under the existing Share Repurchase Program is $1.5 billion. Shares are retired upon repurchase and not held as treasury stock.

[2]

(1) In December 2024, the board of directors approved a share repurchase program (the Share Repurchase Program), which authorizes the repurchase of up to $3.0 billion of CME Group Class A common stock at prevailing market prices. During the three and six months ended June 30, 2025, 32,265 shares of outstanding Class A common stock were repurchased at an average price of $253.05 per share for a total of $8.2 million The remaining aggregate amount under the existing Share Repurchase Program is $3.0 billion. Shares are retired upon repurchase and not held as treasury stock.

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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- Definition

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-URI https://asc.fasb.org/1943274/2147480070/505-10-S50-1

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
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-Name Accounting Standards Codification
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
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-Name Accounting Standards Codification
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-URI https://asc.fasb.org/1943274/2147480100/505-10-S45-2

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 9: http://www.xbrl.org/2003/role/exampleRef
-Topic 946
-SubTopic 830
-Name Accounting Standards Codification
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-Paragraph 11
-Publisher FASB
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Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
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-Name Accounting Standards Codification
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Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 13: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
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-Section S50
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480657/210-10-S50-11

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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-Name Accounting Standards Codification
-Section 45
-Paragraph 4
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478009/946-205-45-4

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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-Name Accounting Standards Codification
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478448/946-505-50-2

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-09(4)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-3

+ Details

CONSOLIDATED STATEMENTS OF EQUITY - USD ($)
shares in Thousands, $ in Millions

Total

Preferred Stock

Preferred Stock, Common Stock and Additional Paid-in Capital

Retained Earnings

Accumulated Other Comprehensive Income (Loss)

Common Class A

Common Stock

Common Class B

Common Stock

Preferred stock beginning balance (in shares) at Dec. 31, 2024

4,584

Common stock beginning balance (in shares) at Dec. 31, 2024

359,602

Beginning balance at Dec. 31, 2024

$ 26,486.9

$ 22,406.6

$ 4,185.8

$ (105.5)

Increase (Decrease) in Stockholders' Equity [Roll Forward]

Net Income

1,981.3

Other comprehensive income (loss)

150.9

Dividends on common stock

(912.2)

Vesting of issued restricted Class A common stock (in shares)

Vesting of issued restricted Class A common stock

(8.8)

Shares issued to Board of Directors (in shares)

Shares issued to Board of Directors

3.0

Shares issued under Employee Stock Purchase Plan (in shares)

Shares issued under Employee Stock Purchase Plan

4.2

Repurchase of Class A common stock (in shares)

^[1]

(32)

Repurchase of Class A common stock

^[1]

(8.2)

Stock-based compensation

41.9

Preferred stock ending balance (in shares) at Jun. 30, 2025

4,584

Common stock ending balance (in shares) at Jun. 30, 2025

359,647

Ending balance at Jun. 30, 2025

27,739.0

22,438.7

5,254.9

45.4

Preferred stock beginning balance (in shares) at Mar. 31, 2025

4,584

Common stock beginning balance (in shares) at Mar. 31, 2025

359,646

Beginning balance at Mar. 31, 2025

27,030.7

22,419.6

4,685.9

(74.8)

Increase (Decrease) in Stockholders' Equity [Roll Forward]

Net Income

1,025.1

Other comprehensive income (loss)

120.2

Dividends on common stock

(456.1)

Vesting of issued restricted Class A common stock (in shares)

Vesting of issued restricted Class A common stock

(0.6)

Shares issued to Board of Directors (in shares)

Shares issued to Board of Directors

3.0

Shares issued under Employee Stock Purchase Plan (in shares)

Shares issued under Employee Stock Purchase Plan

4.2

Repurchase of Class A common stock (in shares)

^[1]

(32)

Repurchase of Class A common stock

^[1]

(8.2)

Stock-based compensation

20.7

Preferred stock ending balance (in shares) at Jun. 30, 2025

4,584

Common stock ending balance (in shares) at Jun. 30, 2025

359,647

Ending balance at Jun. 30, 2025

$ 27,739.0

22,438.7

5,254.9

45.4

Preferred stock beginning balance (in shares) at Dec. 31, 2025

4,584

Common stock beginning balance (in shares) at Dec. 31, 2025

358,950

Beginning balance at Dec. 31, 2025

$ 28,728.2

22,213.1

6,433.2

81.9

Increase (Decrease) in Stockholders' Equity [Roll Forward]

Net Income

2,196.1

Other comprehensive income (loss)

(27.0)

Dividends on common stock

(3,171.8)

Conversion of Series G preferred stock to Class A common stock (in shares)

(4,584)

4,600

4,584

Vesting of issued restricted Class A common stock (in shares)

Vesting of issued restricted Class A common stock

(22.2)

Shares issued to Board of Directors (in shares)

Shares issued to Board of Directors

3.1

Shares issued under Employee Stock Purchase Plan (in shares)

Shares issued under Employee Stock Purchase Plan

4.3

Repurchase of Class A common stock (in shares)

^[2]

(4,385)

Repurchase of Class A common stock

^[2]

(1,236.9)

Stock-based compensation

$ 46.6

46.6

Preferred stock ending balance (in shares) at Jun. 30, 2026

Common stock ending balance (in shares) at Jun. 30, 2026

359,275

Ending balance at Jun. 30, 2026

$ 26,520.4

21,008.0

5,457.5

54.9

Preferred stock beginning balance (in shares) at Mar. 31, 2026

Common stock beginning balance (in shares) at Mar. 31, 2026

361,790

Beginning balance at Mar. 31, 2026

26,618.2

21,674.2

4,884.6

59.4

Increase (Decrease) in Stockholders' Equity [Roll Forward]

Net Income

1,041.8

Other comprehensive income (loss)

(4.5)

Dividends on common stock

(468.9)

Vesting of issued restricted Class A common stock (in shares)

Vesting of issued restricted Class A common stock

(0.2)

Shares issued to Board of Directors (in shares)

Shares issued to Board of Directors

3.1

Shares issued under Employee Stock Purchase Plan (in shares)

Shares issued under Employee Stock Purchase Plan

4.3

Repurchase of Class A common stock (in shares)

^[2]

(2,546)

Repurchase of Class A common stock

^[2]

(698.2)

Stock-based compensation

$ 24.8

24.8

Preferred stock ending balance (in shares) at Jun. 30, 2026

Common stock ending balance (in shares) at Jun. 30, 2026

359,275

Ending balance at Jun. 30, 2026

$ 26,520.4

$ 21,008.0

$ 5,457.5

$ 54.9

[1]

(1) In December 2024, the board of directors approved a share repurchase program (the Share Repurchase Program), which authorizes the repurchase of up to $3.0 billion of CME Group Class A common stock at prevailing market prices. During the three and six months ended June 30, 2025, 32,265 shares of outstanding Class A common stock were repurchased at an average price of $253.05 per share for a total of $8.2 million The remaining aggregate amount under the existing Share Repurchase Program is $3.0 billion. Shares are retired upon repurchase and not held as treasury stock.

[2]

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Statement [Line Items]
Accounts receivable, allowance	$ 9.1	$ 10.0
Other current asset	4.4	6.5
Accumulated depreciation and amortization, property	$ 993.7	$ 1,005.7
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	10,000	10,000
Preferred stock, shares issued (in shares)	0	4,584
Preferred stock, shares outstanding (in shares)	0	4,584
Common Class A
Statement [Line Items]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	1,000,000	1,000,000
Common stock, shares issued (in shares)	359,275	358,950
Common stock, shares outstanding (in shares)	359,275	358,950
Common Class B
Statement [Line Items]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	3	3
Common stock, shares issued (in shares)	3	3
Common stock, shares outstanding (in shares)	3	3

Leases (Tables)

6 Months Ended

Jun. 30, 2026

Leases [Abstract]

Schedule of Components of Lease Costs

The components of lease costs were as follows:


	Quarter Ended June 30,				Six Months Ended June 30,
(in millions)	2026		2025		2026		2025
Operating lease expense:
Operating lease cost	$	13.6	$	4.1	$	25.5	$	13.8
Short-term lease cost	0.1		0.1		0.2		0.2
Total operating lease expense included in other expense	$	13.7	$	4.2	$	25.7	$	14.0

Finance lease expense:
Interest expense	$	0.5	$	0.5	$	0.9	$	1.0
Depreciation expense	2.1		2.1		4.3		4.3
Total finance lease expense	$	2.6	$	2.6	$	5.2	$	5.3

Sublease revenue included in other revenue	$	3.9	$	3.3	$	7.8	$	6.2

Schedule of Supplemental Cash Flow

Supplemental cash flow information related to leases was as follows:


	Quarter Ended June 30,				Six Months Ended June 30,
(in millions)	2026		2025		2026		2025
Cash outflows for operating leases	$	15.8	$	15.2	$	29.9	$	30.3
Cash outflows for finance lease	4.4		4.3		8.8		8.7

Schedule of Supplemental Balance Sheet

Supplemental balance sheet information related to leases was as follows:

Operating leases


(in millions)	June 30, 2026			December 31, 2025
Operating lease right-of-use assets	$	334.8		$	210.3

Operating lease liabilities:
Other current liabilities	$	54.8		$	46.8
Other liabilities	343.2			237.4
Total operating lease liabilities	$	398.0		$	284.2



Weighted average remaining lease term (in months)	104			99
Weighted average discount rate	4.4		%	4.1		%

Finance lease


(in millions)	June 30, 2026			December 31, 2025
Finance lease right-of-use assets	$	41.2		$	45.5

Finance lease liabilities:
Other current liabilities	$	9.1		$	9.0
Other liabilities	37.2			41.7
Total finance lease liabilities	$	46.3		$	50.7

Weighted average remaining lease term (in months)	57			63
Weighted average discount rate	3.5		%	3.5		%

Schedule of Future Minimum Operating Lease Payments

Future minimum lease payments were as follows as of June 30, 2026 for operating and finance leases:


(in millions)	Operating Leases
Remainder of 2026	$	36.8
2027	66.2
2028	60.8
2029	50.5
2030	49.8
2031	48.2
Thereafter	163.6
Total lease payments	475.9
Less: imputed interest	(77.9)
Present value of lease liability	$	398.0

Schedule of Future Minimum Finance Lease Payments


(in millions)	Finance Leases
Remainder of 2026	$	8.8
2027	17.8
2028	17.9
2029	18.1
2030	18.3
2031	4.6
Thereafter	—
Total lease payments	85.5
Less: imputed interest	(39.2)
Present value of lease liability	$	46.3

Intangible Assets and Goodwill (Tables)

6 Months Ended

Jun. 30, 2026

Intangible Asset, Goodwill and Other [Abstract]

Schedule of Intangible Asset, Finite-Lived

Intangible assets consisted of the following at June 30, 2026 and December 31, 2025:


	June 30, 2026				December 31, 2025
(in millions)	Assigned Value		Accumulated Amortization		Net Book Value		Assigned Value		Accumulated Amortization		Net Book Value
Amortizable Intangible Assets:
Clearing firm, market data and other customer relationships	$	4,695.3	$	(2,661.8)	$	2,033.5	$	4,703.0	$	(2,557.5)	$	2,145.5

Technology-related intellectual property	62.5		(62.5)		—		62.5		(62.5)		—
Other	73.3		(62.2)		11.1		73.9		(58.7)		15.2
Total amortizable intangible assets	$	4,831.1	$	(2,786.5)	$	2,044.6	$	4,839.4	$	(2,678.7)	$	2,160.7

Indefinite-Lived Intangible Assets:
Trade names					450.0						450.0
Total intangible assets – other, net					$	2,494.6					$	2,610.7
Trading products (1)					$	17,175.3					$	17,175.3

Schedule of Intangible Asset, Indefinite-Lived

Intangible assets consisted of the following at June 30, 2026 and December 31, 2025:


	June 30, 2026				December 31, 2025
(in millions)	Assigned Value		Accumulated Amortization		Net Book Value		Assigned Value		Accumulated Amortization		Net Book Value
Amortizable Intangible Assets:
Clearing firm, market data and other customer relationships	$	4,695.3	$	(2,661.8)	$	2,033.5	$	4,703.0	$	(2,557.5)	$	2,145.5

Technology-related intellectual property	62.5		(62.5)		—		62.5		(62.5)		—
Other	73.3		(62.2)		11.1		73.9		(58.7)		15.2
Total amortizable intangible assets	$	4,831.1	$	(2,786.5)	$	2,044.6	$	4,839.4	$	(2,678.7)	$	2,160.7

Indefinite-Lived Intangible Assets:
Trade names					450.0						450.0
Total intangible assets – other, net					$	2,494.6					$	2,610.7
Trading products (1)					$	17,175.3					$	17,175.3

Schedule of Future Estimated Amortization Expense

As of June 30, 2026, the future estimated amortization expense related to amortizable intangible assets is expected to be as follows:


(in millions)	Amortization Expense
Remainder of 2026	$	111.1
2027	220.9
2028	214.4
2029	214.4
2030	214.4
2031	214.4
Thereafter	855.0

Schedule of Goodwill

Goodwill activity consisted of the following for the periods ended June 30, 2026 and December 31, 2025:


(in millions)	Goodwill
Balance at December 31, 2024	$	10,486.9
Foreign currency translation	27.8
Balance at December 31, 2025	10,514.7
Foreign currency translation	(8.9)
Balance at June 30, 2026	$	10,505.8

- Definition

Tabular disclosure of goodwill.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-2

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 24
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482548/350-20-55-24

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
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-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1A

+ Details

Accumulated Other Comprehensive Income (Loss)

6 Months Ended

Jun. 30, 2026

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Accumulated Other Comprehensive Income (Loss)


(in millions)	Investment Securities		Defined Benefit Plans		Derivative Investments		Foreign Currency Translation		Total
Balance at December 31, 2025	$	—	$	0.3	$	56.2	$	25.4	$	81.9
Other comprehensive income (loss) before reclassifications and income tax benefit (expense)	(0.1)		(2.2)		—		(26.6)		(28.9)
Amounts reclassified from accumulated other comprehensive income (loss)	—		(0.1)		(2.1)		—		(2.2)
Income tax benefit (expense)	—		0.5		0.5		3.1		4.1
Net current period other comprehensive income (loss)	(0.1)		(1.8)		(1.6)		(23.5)		(27.0)
Balance at June 30, 2026	$	(0.1)	$	(1.5)	$	54.6	$	1.9	$	54.9


(in millions)	Investment Securities		Defined Benefit Plans		Derivative Investments		Foreign Currency Translation		Total
Balance at December 31, 2024	$	(0.3)	$	(14.1)	$	59.3	$	(150.4)	$	(105.5)
Other comprehensive income (loss) before reclassifications and income tax benefit (expense)	0.1		(1.2)		—		164.3		163.2

Amounts reclassified from accumulated other comprehensive income (loss)	—		(0.1)		(2.0)		—		(2.1)
Income tax benefit (expense)	—		0.3		0.5		(11.0)		(10.2)
Net current period other comprehensive income (loss)	0.1		(1.0)		(1.5)		153.3		150.9

Balance at June 30, 2025	$	(0.2)	$	(15.1)	$	57.8	$	2.9	$	45.4

Debt (Tables)

6 Months Ended

Jun. 30, 2026

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

Long-term debt consisted of the following at June 30, 2026 and December 31, 2025:


(in millions)	June 30, 2026		December 31, 2025
$500.0 million fixed rate notes due June 2028, stated rate of 3.75%	$	499.2	$	498.9
$750.0 million fixed rate notes due March 2030, stated rate of 4.40%	743.0		742.1
$750.0 million fixed rate notes due March 2032, stated rate of 2.65%	745.0		744.6
$750.0 million fixed rate notes due September 2043, stated rate of 5.30% (1)	744.7		744.6
$700.0 million fixed rate notes due June 2048, stated rate of 4.15%	692.3		692.1
Total long-term debt	$	3,424.2	$	3,422.3

Schedule of Maturities of Long-term Debt

Long-term debt maturities, at par value, were as follows at June 30, 2026:


(in millions)	Par Value
2027	$	—
2028	500.0
2029	—
2030	750.0
2031	—
Thereafter	2,200.0

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 235
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.9-06)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477314/942-235-S99-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-3

Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-8

Reference 4: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 505
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-Name Accounting Standards Codification
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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Statement of Comprehensive Income [Abstract]
Net Income	$ 1,041.8	$ 1,025.1	$ 2,196.1	$ 1,981.3
Other comprehensive income (loss), net of tax:
Net unrealized holding gains (losses) arising during the period	0.0	(0.1)	(0.1)	0.1
Investment securities, net	0.0	(0.1)	(0.1)	0.1
Net change in defined benefit plans arising during the period	(0.1)	0.0	(2.2)	(1.2)
Amortization of net actuarial (gains) losses included in compensation and benefits expense	(0.1)	(0.1)	(0.1)	(0.1)
Income tax benefit (expense)	0.1	0.0	0.5	0.3
Defined benefit plans, net	(0.1)	(0.1)	(1.8)	(1.0)
Reclassification of net unrealized (gains) losses to interest expense and other non-operating income (expense)	(1.0)	(1.1)	(2.1)	(2.0)
Income tax benefit (expense)	0.2	0.3	0.5	0.5
Derivative investments, net	(0.8)	(0.8)	(1.6)	(1.5)
Foreign currency translation adjustments	(4.7)	128.7	(26.6)	164.3
Income tax benefit (expense)	1.1	(7.5)	3.1	(11.0)
Foreign currency translation, net	(3.6)	121.2	(23.5)	153.3
Other comprehensive income (loss), net of tax	(4.5)	120.2	(27.0)	150.9
Comprehensive income	$ 1,037.3	$ 1,145.3	$ 2,169.1	$ 2,132.2

Revenue Recognition (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Revenue Recognition [Abstract]
Deferred revenue	$ 52.8	$ 16.7

Segment Reporting	6 Months Ended
Segment Reporting	Jun. 30, 2026
Segment Reporting [Abstract]
Segment Reporting	Segment Reporting The company's business is conducted through one reportable business segment, CME Group consolidated. The company has one operating segment as this is the level at which resource allocation and operating decisions regarding company performance are evaluated and determined by the senior leadership team. The chief operating decision maker (CODM) reviews the financial results of CME Group consolidated on an ongoing basis throughout the year. As a single segment, the segment profitability measure is consolidated net income. Consolidated net income informs key operating decisions as made by the CODM, which include bonus allocation, discretionary share-based awards, liquidity and cash needs, new product development, existing product expansion and product discontinuation. Consolidated net income is deemed the best indicator of segment performance. Segment assets are not reported to, or used by, the CODM to allocate resources or to assess performance. The CODM evaluates current period consolidated net income performance as compared to prior periods, budgeted results and forecasts. The CODM reviews consolidated revenues as disaggregated by the following: clearing and transaction fees as a combination of rate per contract and average daily volume for each major asset class, market data fee revenue and other revenue. The significant expense categories are consistent with those presented on the face of the consolidated statements of income. The components of non-operating income are also reviewed by the CODM. It is noted that the level of financial information provided to the CODM is consistent with the financial statement line items as disclosed in our consolidated statements of income.

- Definition

The entire disclosure for segment reporting.

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