UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549


                                   FORM 8-K

                                CURRENT REPORT
                    PURSUANT TO SECTION 13 OR 15(d) OF THE
                        SECURITIES EXCHANGE ACT OF 1934


               Date of report (Date of earliest event reported)
                                 July 22, 2003


                   CHICAGO MERCANTILE EXCHANGE HOLDINGS INC.
 ----------------------------------------------------------------------------
              (Exact Name of Registrant as Specified in Charter)


          Delaware                    001-31553             36-4459170
        ---------------           -----------------      ---------------
(State or Other Jurisdiction         (Commission          (IRS Employer
     of Incorporation)               File Number)       Identification No.)



30 South Wacker Drive, Chicago, Illinois                         60606
- ---------------------------------------------------             --------
(Address of Principal Executive Office)                        (Zip Code)


Registrant's telephone number, including area code:  (312) 930-1000


                                      N/A
              ---------------------------------------------------
         (Former Name or Former Address, if Changed Since Last Report)


ITEM 9.  Regulation FD Disclosure.

         This information set forth under "Item 9. Regulation FD Disclosure"
is intended to be furnished under "Item 12. Results Of Operations And
Financial Condition" in accordance with SEC Release No. 33-8216. Such
information, including the Exhibit attached hereto, shall not be deemed
"filed" for purposes of Section 18 of the Securities Act of 1934, nor shall it
be deemed incorporated by reference in any filing under the Securities Act of
1933, except as shall be expressly set forth by specific reference in such
filing.

         Attached and incorporated herein by reference as Exhibit 99.1 is a
copy of a press release of Chicago Mercantile Exchange Holdings Inc., dated
July 22, 2003, reporting Chicago Mercantile Exchange Holdings Inc.'s financial
results for the second quarter of 2003.


                                 EXHIBIT INDEX


Exhibit
Number            Description
- -----------       --------------

99.1              Press Release, dated July 22, 2003.



                                  SIGNATURES

         Pursuant to the requirements of the Securities Exchange Act of 1934,
as amended, the registrant has duly caused this report to be signed on its
behalf by the undersigned hereunto duly authorized.


                                 CHICAGO MERCANTILE EXCHANGE HOLDINGS INC.
                                 Registrant


Date: July 22, 2003              By: /s/ Kathleen M. Cronin
                                     ------------------------
                                     Kathleen M. Cronin
                                     Corporate Secretary


                                                                  Exhibit 99.1


CHICAGO MERCANTILE
EXCHANGE HOLDINGS INC.       NEWS RELEASE


                                             Media Contacts
                                             Ellen G. Resnick, 312/930-3435
                                             Maryellen T. Thielen, 312/930-3467
                                             news@cme.com

FOR IMMEDIATE RELEASE                        Investor Contact
                                             John Peschier, 312/930-8491


Chicago Mercantile Exchange Holdings Inc. Reports Record Revenues, Earnings
for the Second Quarter of 2003, Spurred by Strength in Major Product Groups

         CHICAGO, July 22, 2003-- Chicago Mercantile Exchange Holdings Inc.
(NYSE: CME) today reported record revenues and earnings for the second quarter
of 2003, spurred by strong trading volume in its three largest product
categories: interest rates, equities and foreign exchange.

         Net revenues increased 32 percent to a record $142.4 million for the
second quarter of 2003, compared with $107.5 million for the year-earlier
period. Net income rose 67 percent to a record $35.0 million, versus $21.0
million for the same period in 2002. Earnings per diluted share improved 45
percent to a record $1.03 from 71 cents per diluted share for the second
quarter last year. This growth occurred on a base of shares that has increased
by 3.7 million with the company's initial public offering in December 2002.

         Average daily volume increased 23 percent to nearly 2.7 million
contracts for the second quarter of 2003 versus the same period of 2002. Each
of CME's trading venues set quarterly volume records. More than 1.5 million
contracts a day were traded via open outcry, up 5 percent from the second
quarter last year. Nearly 1.1 million contracts a day changed hands on CME's
GLOBEX(R) electronic trading platform, a 63 percent increase from a year ago,
and 41,000 contracts a day were privately negotiated, up 25 percent. During
the second quarter of 2003, 41 percent of CME's volume traded on GLOBEX,
compared with 31 percent during the same period a year ago. June 2003 was the
second busiest month in CME's history for E-mini(TM) equity futures, which
averaged more than 1.0 million contracts a day during the month.

         "Our strong second quarter performance was driven by our diverse
product line with substantial trading volume in our three largest product
groups - particularly interest rates - where volume grew each month to
culminate in a new record in June," said Chairman Terry Duffy. "We believe
that one contributor to this growth has been a continuing shift in the global
derivatives landscape as users are increasingly focused on credit quality and
cognizant of the appeal of transparent, exchange-traded instruments with
central counterparty clearing. Our interest rate volume also benefited from
continued mortgage refinancing activity, which increasingly is hedged with our
Eurodollar futures and options contracts - as well as the quarter-point
interest rate adjustment by the U.S. Federal Reserve Board.

         "This quarter, we will continue to aggressively prepare for the
launch of the CME/CBOT(R) Common Clearing Link based on the definitive
agreement we reached in April," said Duffy. "We are on track to begin clearing
Chicago Board of Trade(R) commodity, equity and certain interest rate products
on Nov. 24, 2003, with the remainder scheduled to begin on Jan. 2, 2004."

         "We've focused significant resources on expanding our distribution,
making it easier than ever before to trade on CME, no matter where you are in
the world," said President and Chief Executive Officer Jim McNulty. "In the
past three years, we opened up access to GLOBEX, dramatically increased the
speed of trading, established a telecommunications hub in Europe and increased
the number of independent software vendors and data centers that offer GLOBEX
interfaces. Since the beginning of this year, we've added 16 network
connections to our European hub, for a total of 36; streamlined our foreign
exchange delivery process to offer cost savings to market participants; and
announced two new programs to expand telecommunications alternatives and
reduce costs for users of GLOBEX, our CLEARING 21(R) system and our market
data. We believe that broadening access and distribution has expanded both our
customer base and trading volume."

         For the second quarter of 2003, revenue from clearing and transaction
fees increased 37 percent to $115.8 million from $84.3 million for the same
period of 2002. Quotation data fees rose 14 percent to $13.6 million for the
second quarter of 2003, versus $11.9 million for the same period a year ago,
driven by a pricing change that took effect in April 2003.

         Total operating expenses for the second quarter of 2003 were $83.0
million, compared with $73.0 million for the second quarter of 2002. During
the 2003 quarter, the company recorded stock-based compensation expense of
$0.8 million. Based on a stock option and restricted stock grant in June, CME
expects the stock-based compensation portion of compensation and benefits to
increase to approximately $1.4 million per quarter in the third and fourth
quarters of 2003.

         Income before income taxes was $59.4 million for the second quarter
of 2003, an increase of 72 percent from $34.5 million for the same period a
year ago. The company's operating margin, defined as income before income
taxes expressed as a percentage of net revenues, was 41.7 percent for the
second quarter of 2003, compared with 32.1 percent for the year-earlier
quarter.

         CME's working capital was $381.6 million at June 30, 2003, compared
with $325.6 million at Dec. 31, 2002, primarily due to the operating results
during the first six months of 2003.

         Capital expenditures and capitalized software development costs were
$13.9 million for the second quarter. The company paid a quarterly dividend of
14 cents per common share, which totaled $4.6 million in June 2003.

Six-Month Results

         For the first six months of 2003, net revenues increased 29 percent
to a record $268.4 million from $208.6 million for the first half of 2002.
Clearing and transaction fees improved 35 percent to $218.2 million from
$162.2 million a year ago, benefiting from higher trading volume. Total
operating expenses were $165.3 million for the first half of 2003, versus
nearly $143.0 million for the comparable period of 2002. Income before income
taxes was $103.1 million for the first half of 2003, up 57 percent from $65.7
million for the same period a year ago. The operating margin was 38.4 percent
for the first six months of 2003, compared with 31.5 percent for the
year-earlier period.

         The company reported record net income of $61.1 million, or $1.81 per
diluted share, for the first six months of this year, compared with $39.7
million, or $1.33 per diluted share, for the first half of 2002.

         Capital expenditures and capitalized software development costs were
$25.0 million for the first six months of 2003.

         During the second quarter of 2003, certain shareholders sold
1,220,635 shares of Class A common stock at a price of $69.60 per share in an
underwritten offering. The company did not sell any shares or receive any
proceeds from the sale of stock by its shareholders in the offering.

         Chicago Mercantile Exchange Holdings Inc. became the first publicly
traded U.S. financial exchange on Dec. 6, 2002. The company was added to the
Russell 1000(R) Index on July 1, 2003. It is the parent company of Chicago
Mercantile Exchange Inc. (www.cme.com), the largest futures exchange in the
United States. As an international marketplace, CME brings together buyers and
sellers on its trading floors and its GLOBEX electronic trading platform. CME
offers futures contracts and options on futures contracts primarily in four
areas: interest rates, stock indexes, foreign exchange and commodities. The
exchange moved about $1.5 billion per day in settlement payments in the first
half of 2003 and managed $29.1 billion in collateral deposits at June 30,
2003.

         CME will hold a conference call to discuss second quarter results at
8:30 a.m. Eastern time today. A live audio Webcast of the conference call will
be available on the Investor Relations section of CME's Web site; those
wishing to listen to the live conference via telephone should dial (800)
500-0177 if calling from within the United States or (719) 457-2679 if calling
from outside the United States at least 10 minutes before the call begins.
Following the conference call, an archived recording and PowerPoint slides
will be available at the same site.

         Statements in this news release that are not historical facts are
forward-looking statements. These statements are not guarantees of future
performance and involve risks, uncertainties and assumptions that are
difficult to predict. Therefore, actual outcomes and results may differ
materially from what is expressed or implied in any forward-looking
statements. Among the factors that might affect our performance are:
increasing competition by foreign and domestic competitors, including new
entrants into our markets; our ability to keep pace with rapid technological
developments; our ability to continue introducing competitive new products and
services on a timely, cost-effective basis, including through our electronic
trading capabilities; our ability to maintain the competitiveness of our
existing products and services; our ability to efficiently and simultaneously
operate both open outcry trading and electronic trade execution facilities;
our ability to adjust our fixed costs and expenses if our revenues decline;
changes in domestic and foreign regulations; changes in government policy,
including interest rate policy; the costs associated with protecting our
intellectual property rights and our ability to operate our business without
violating the intellectual property rights of others; the ability of our joint
venture, OneChicago, to obtain market acceptance of its products and achieve
sufficient trading volume to operate profitably; and the continued
availability of financial resources in the amounts and on the terms required
to support our future business. In addition, our performance could be affected
by our ability to realize the benefits or efficiencies we expect from our
for-profit initiatives, such as fee increases, volume and member discounts and
new access rules to our markets; our ability to recover market data fees that
may be reduced or eliminated by the growth of electronic trading; changes in
the level of trading activity, price levels and volatility in the derivatives
markets and in underlying fixed income, equity, foreign exchange and
commodities markets; economic, political and market conditions; our ability to
accommodate increases in trading volume without failure or degradation of
performance of our trading systems; our ability to manage the risks associated
with our acquisition, investment and alliance strategy; industry and customer
consolidation; decreases in member trading and clearing activity and
seasonality of the futures business. More detailed information about factors
that may affect our performance may be found in our filings with the
Securities and Exchange Commission, including our most recent Annual Report on
Form 10-K, which is available in the Investor Information section of the CME
Web site. We undertake no obligation to publicly update any forward-looking
statements, whether as a result of new information, future events or
otherwise.

         GLOBEX is a registered trademark of Chicago Mercantile Exchange Inc.
E-mini is a trademark of CME. CLEARING 21 is a registered trademark of CME and
New York Mercantile Exchange, Inc. Russell 1000 and other trade names, service
marks, trademarks and registered trademarks that are not proprietary to
Chicago Mercantile Exchange Inc. are the property of their respective owners,
and are used herein under license. Further information about Chicago
Mercantile Exchange Holdings Inc. and Chicago Mercantile Exchange Inc. is
available on the CME Web site at www.cme.com.




                             Chicago Mercantile Exchange Holdings Inc. and Subsidiaries
                                            Consolidated Balance Sheets
                                               (dollars in thousands)

                                                                                June 30, 2003          Dec. 31, 2002
ASSETS
Current Assets:
                                                                                                    
   Cash and cash equivalents                                                       $  392,835             $  339,260
   Proceeds from securities lending activities                                      1,057,976                985,500
   Accounts receivable                                                                 69,316                 50,865
   Other current assets                                                                 8,350                 11,515
   Cash performance bonds and security deposits                                     1,968,317              1,827,991
                                                                                    ---------              ---------
Total Current Assets                                                                3,496,794              3,215,131
Property, net of accumulated depreciation and amortization                            107,096                109,563
Other assets                                                                           36,360                 30,322
                                                                                   ----------             ----------
TOTAL ASSETS                                                                       $3,640,250             $3,355,016
                                                                                   ==========             ==========

LIABILITIES AND SHAREHOLDERS' EQUITY
Current Liabilities:
   Accounts payable                                                                $   29,173             $   27,607
   Payable under securities lending agreements                                      1,057,976                985,500
      Other current liabilities                                                        59,692                 48,396
   Cash performance bonds and security deposits                                     1,968,317              1,827,991
                                                                                    ---------              ---------
Total Current Liabilities                                                           3,115,158              2,889,494
Long-term debt                                                                            648                  2,328
Other liabilities                                                                      19,411                 17,055
                                                                                    ---------              ---------
Total Liabilities                                                                   3,135,217              2,908,877
Shareholders' Equity                                                                  505,033                446,139
                                                                                   ----------             ----------
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY                                         $3,640,250             $3,355,016
                                                                                   ==========             ==========

                                           Balance Sheet Items Excluding
                       Cash Performance Bonds and Security Deposits and Securities Lending(1)

                                                                                June 30, 2003          Dec. 31, 2002
Current assets                                                                       $470,501               $401,640
Total assets                                                                          613,957                541,525
Current liabilities                                                                    88,865                 76,003
Total liabilities                                                                     108,924                 95,386

1 Securities lending and cash performance bonds and securities deposits are
  excluded from this presentation, as there are current assets for these
  balances that have equal and offsetting current liabilities. This
  presentation results in a more meaningful indication to investors of the
  assets owned and related obligations of the company. Clearing firms are
  subject to performance bond requirements pursuant to the rules of the
  exchange. The clearing firm can elect to satisfy these requirements in cash,
  which is reflected in the consolidated balance sheets, or by depositing
  securities, which are not reflected in the consolidated balance sheets. The
  balance of cash performance bonds and security deposits that are deposited
  by clearing firms may change daily as a result of changes in the clearing
  firms' open positions and how clearing firms elect to satisfy their
  performance bond requirements. Securities lending transactions utilize a
  portion of the securities that clearing firms have deposited to satisfy
  their proprietary performance bond requirements.






                             Chicago Mercantile Exchange Holdings Inc. and Subsidiaries
                                         Consolidated Statements of Income
                             (dollars in thousands, except share and per share amounts)

                                                                    Quarter Ended                Six Months Ended
                                                                       June 30,                      June 30,
                                                               2003            2002           2003           2002
                                                               ----            ----           ----           ----
REVENUES
                                                                                                
   Clearing & transaction fees                                $115,808         $84,274       $218,207       $162,159
   Quotation data fees                                          13,570          11,925         25,369         24,390
   GLOBEX access fees                                            3,883           3,278          7,605          6,408
   Communication fees                                            2,412           2,506          4,828          4,911
   Investment income                                             2,164           1,304          3,310          2,921
   Securities lending interest income                            2,029           6,275          4,886          9,789
   Other operating revenue                                       4,429           3,518          8,690          6,571
                                                               -------         -------        -------        -------
       TOTAL REVENUES                                          144,295         113,080        272,895        217,149
   Securities lending interest expense                          (1,904)         (5,548)        (4,488)        (8,525)
                                                               -------         -------        -------        --------
       NET REVENUES                                            142,391         107,532        268,407        208,624
                                                               -------         -------        -------        -------

EXPENSES
   Compensation & benefits                                      37,970          29,335         71,214         60,108
   Occupancy                                                     6,294           5,308         12,575         11,089
   Professional fees, outside services & licenses                7,561           8,377         14,939         15,638
   Communications & computer & software                         11,182          11,325         23,299         21,633
       maintenance
   Depreciation & amortization                                  13,321          12,337         26,532         23,151
   Marketing, advertising & public relations                     1,534           1,354          7,136          2,917
   Other operating expense                                       5,159           5,007          9,588          8,436
                                                                ------          ------        -------        -------
       TOTAL EXPENSES                                           83,021          73,043        165,283        142,972
                                                                ------          ------        -------        -------

Income before income taxes                                      59,370          34,489        103,124         65,652
Income tax provision                                           (24,357)        (13,498)       (41,990)       (26,002)
                                                               --------        --------       --------      ---------
       NET INCOME                                             $ 35,013        $ 20,991        $61,134       $ 39,650
                                                              ========        ========        =======       ========

EARNINGS PER SHARE
Basic                                                           $ 1.07          $ 0.73         $ 1.88         $ 1.38
                                                                ======          ======         ======         ======
Diluted                                                         $ 1.03          $ 0.71         $ 1.81         $ 1.33
                                                                ======          ======         ======         ======

Weighted average number of common shares:
       Basic(2)                                             32,624,015      28,800,423     32,579,249     28,787,562
       Diluted(2)                                           33,867,000      29,656,429     33,865,295     29,706,321

2 In December 2002, CME Holdings issued approximately 3.7 million shares in its initial public offering.






                                  Average Daily Volume (Round Turns, in Thousands)
                                                             2Q           3Q           4Q           1Q           2Q
                                                            2002         2002         2002         2003         2003
                                                                                                 
Interest rates                                              1,295        1,290        1,030        1,121        1,389
Equity E-mini                                                 598          812          848          958          936
Equity standard-size                                          140          161          138          142          134
Foreign exchange                                              102           93           93          127          137
Commodities                                                    32           28           29           35           34
                                                            -----       ------        -----        -----        -----
    Subtotal                                                2,167        2,384        2,138        2,383        2,630
TRAKRS                                                         --           31          122           18           46
                                                            -----       ------        -----        -----        -----
    Total                                                   2,167        2,415        2,260        2,401        2,676
                                                            =====        =====        =====        =====        =====

Open outcry                                                 1,467        1,471        1,192        1,299        1,548
Electronic (including TRAKRS)                                 667          915        1,036        1,063        1,087
Privately negotiated                                           33           29           32           39           41
                                                            -----       ------        -----        -----        -----
    Total                                                   2,167        2,415        2,260        2,401        2,676
                                                            =====        =====        =====        =====        =====

                                          Transaction Fees (in Thousands)
                                                             2Q(3)        3Q           4Q           1Q           2Q(4)
                                                            2002         2002         2002          2003         2003
Interest rates                                            $35,809      $38,314      $33,506      $33,763      $47,174
Equity E-mini                                              25,946       37,018       37,639       41,607       39,692
Equity standard-size                                        9,149       11,948       10,691       10,594       10,641
Foreign exchange                                           11,606       10,320       11,322       14,502       16,235
Commodities                                                 1,764        1,650        1,766        1,920        2,034
                                                           ------       ------      -------      -------      -------
    Subtotal                                               84,274       99,250       94,924      102,386      115,776
TRAKRS                                                         --            5           58           13           32
                                                          -------      -------      -------     --------     --------
    Total                                                 $84,274      $99,255      $94,982     $102,399     $115,808
                                                          =======      =======      =======     ========     ========

Open outcry                                               $43,968      $49,032      $43,568      $43,986      $56,308
Electronic (including TRAKRS)                              32,760       43,489       43,322       48,936       49,245
Privately negotiated                                        7,546        6,734        8,092        9,477       10,255
                                                          -------      -------      -------     --------     --------
    Total                                                 $84,274      $99,255      $94,982     $102,399     $115,808
                                                          =======      =======      =======     ========     ========

                                               Average Rate Per Trade
                                                            2Q(3)         3Q           4Q            1Q          2Q(4)
                                                            2002         2002         2002          2003         2003
Interest rates                                             $ 0.43       $ 0.46       $ 0.51        $ 0.49      $ 0.54
Equity E-mini                                                0.68         0.71         0.69          0.71        0.67
Equity standard-size                                         1.02         1.16         1.21          1.22        1.26
Foreign exchange                                             1.77         1.73         1.90          1.88        1.89
Commodities                                                  0.87         0.92         0.95          0.91        0.95
                                                           ------       ------      -------        -------     -------
    Average excluding TRAKRS                                 0.61         0.65         0.69          0.70        0.70
TRAKRS                                                         --         0.003        0.007         0.012       0.011
                                                           -------      -------     --------       -------     -------
    Overall rate per trade                                 $ 0.61       $ 0.64       $ 0.66        $ 0.70      $ 0.69

Open outcry                                                $ 0.47       $ 0.52       $ 0.57        $ 0.56      $ 0.58
Electronic (including TRAKRS)                                0.77         0.74         0.65          0.75        0.72
Privately negotiated                                         3.62         3.64         3.90          3.96        4.00
                                                           ------       ------       ------        ------      ------
    Overall rate per trade                                 $ 0.61       $ 0.64       $ 0.66        $ 0.70      $ 0.69

3 Second quarter 2002 transaction fees reflect a $5 million reduction for a
  fund established for clearing firms related to a one-time adjustment. This
  reduced the overall rate per trade by 3.6 cents from 64.4 cents to 60.8
  cents, impacting all product groups.

4 Second quarter 2003 transaction fees include a $2.5 million assessment to a
  clearing firm which primarily affected the rate per trade for interest rate
  contracts. Without this assessment, the interest rate contract rate per
  trade would have been 51.2 cents, the assessment increased it 2.7 cents to
  53.9 cents. The overall rate per trade, excluding TRAKRS, would have been
  68.4 cents, and was increased by 1.5 cents to 69.9 cents. Transaction fee
  assessments occur in the regular course of business.



03-108                              # # #