364-DAY REVOLVING CREDIT AGREEMENT

Exhibit 10.1

EXECUTION COPY

$3,000,000,000

364-DAY REVOLVING CREDIT AGREEMENT

Dated as of

July 27, 2007

among

CME GROUP INC.,

as Borrower,

The Lenders Party Hereto,

and

LEHMAN COMMERCIAL PAPER INC,

as Administrative Agent

LEHMAN BROTHERS INC.,

as Sole Lead Arranger and Sole Bookrunner

This 364-DAY REVOLVING CREDIT AGREEMENT (“Agreement”), dated as of July 27, 2007, is made and entered into by and among CME GROUP INC., a Delaware corporation (the “Borrower”), the several banks, financial institutions and other entities from time to time parties hereto (the “Lenders”) and LEHMAN COMMERCIAL PAPER INC., as Administrative Agent.

The parties hereto agree as follows:

ARTICLE I

Definitions

SECTION 1.01. Defined Terms. As used in this Agreement, the following terms have the meanings specified below:

“ Adjusted LIBOR Rate ” means, with respect to any Eurodollar Borrowing for any Interest Period, an interest rate per annum (rounded upwards, if necessary, to the next 1/100 of 1%) equal to the LIBOR Rate for such Interest Period.

“ Administrative Agent ” means Lehman Commercial Paper Inc., in its capacity as administrative agent for the Lenders hereunder.

“ Administrative Questionnaire ” means an Administrative Questionnaire in a form supplied by the Administrative Agent.

“ Affiliate ” means, with respect to a specified Person, another Person that directly, or indirectly through one or more intermediaries, Controls or is Controlled by or is under common Control with the Person specified.

“ Applicable Facility Fee Rate ” means 0.02% per annum.

“ Applicable Margin ” means 0.13% per annum.

“ Applicable Percentage ” means, with respect to any Lender, the percentage of the total Commitments represented by such Lender’s Commitment. If the Commitments have terminated or expired, the Applicable Percentages shall be determined based upon the percentage of the total Loans represented by such Lender’s Loans.

“ Arranger ” means Lehman Brothers Inc., in its capacity as sole lead arranger.

“ Assignment and Assumption ” means an assignment and assumption entered into by a Lender and an assignee (with the consent of any party whose consent is required by Section 9.04), and accepted by the Administrative Agent, substantially in the form of Exhibit A or any other form approved by the Administrative Agent.

“ Availability Period ” means the period from and including the Effective Date to but excluding the earlier of the Maturity Date and the date of termination of the Commitments.

“ Base Rate ” means for any day, a rate per annum (rounded upwards, if necessary, to the next 1/100 of 1%) equal to the greater of (a) the Prime Rate in effect on such day and (b) the Federal Funds Effective Rate in effect on such day plus  ¹ / 2 of 1%. Any change in the Base Rate due to a change in the Prime Rate or the Federal Funds Effective Rate shall be effective as of the opening of business on the effective day of such change in the Prime Rate or the Federal Funds Effective Rate, respectively.

“ Base Rate Loans ” means Loans for which the applicable rate of interest is based upon the Base Rate.

“ Board ” means the Board of Governors of the Federal Reserve System of the United States of America.

“ Borrower ” means CME Group Inc., a Delaware corporation, as successor in interest to Chicago Mercantile Exchange Holdings Inc.

“ Borrowing ” means Loans of the same Type, made, converted or continued on the same date and, in the case of Eurodollar Loans, as to which a single Interest Period is in effect.

“ Borrowing Request ” means a request by the Borrower for a Borrowing in accordance with Section 2.03.

“ Business Day ” means any day that is not a Saturday, Sunday or other day on which commercial banks in New York City or Chicago, Illinois are authorized or required by law to remain closed; provided that, when used in connection with a Eurodollar Loan, the term “ Business Day ” shall also exclude any day on which banks are not open for dealings in dollar deposits in the London interbank market.

“ Capital Lease ” means, with respect to any Person, any lease of (or other arrangement conveying the right to use) real or personal property, or a combination thereof, required to be classified and accounted for as a capital lease on a balance sheet of such Person under GAAP.

“ Capital Lease Obligations ” of any Person means the obligations of such Person to pay rent or other amounts under any Capital Lease, and the amount of such obligations shall be the capitalized amount thereof determined in accordance with GAAP.

“ Change in Control ” means (a) the acquisition of ownership, directly or indirectly, beneficially or of record, by any Person or group (within the meaning of the Securities Exchange Act of 1934 and the rules of the Securities and Exchange Commission thereunder as in effect on the date hereof), of Equity Interests representing more than 50% of the aggregate ordinary voting power represented by the issued and outstanding Equity Interests of the Borrower; or (b) occupation of a majority of the seats (other than vacant seats) on the board of directors of the Borrower by Persons who were neither (i) nominated by, or whose election was approved by, the board of directors of the Borrower nor (ii) appointed by directors so nominated or elected; it being understood that the consummation of the Merger and the Share Repurchase Offer in accordance with the Merger Agreement and the transactions contemplated by the Merger Agreement shall not be deemed a Change in Control.

“ Change in Law ” means (a) the adoption of any law, rule or regulation after the date of this Agreement, (b) any change in any law, rule or regulation or in the interpretation or application thereof by any Governmental Authority after the date of this Agreement or (c) compliance by any Lender (or, for purposes of Section 2.12(b), by any lending office of such Lender or by such Lender’s holding company, if any) with any request, guideline or directive (whether or not having the force of law) of any Governmental Authority made or issued after the date of this Agreement.

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“ Clearinghouse Facility ” means that certain Credit Agreement dated as of October 13, 2006 among Chicago Mercantile Exchange Inc., each of the banks and other financial institutions from time to time party thereto, Bank of Montreal as Administrative Agent, and The Bank of New York as Collateral Agent, as amended, restated, supplemented, increased, extended, renewed, replaced, refinanced (with the same or other lenders) or otherwise modified from time to time.

“ Code ” means the Internal Revenue Code of 1986, as amended from time to time.

“ Commitment ” means, with respect to each Lender, the commitment of such Lender to make Loans, expressed as an amount representing the maximum aggregate amount of such Lender’s Revolving Credit Exposure hereunder, as such commitment may be (a) reduced from time to time pursuant to Section 2.06 and (b) reduced or increased from time to time pursuant to assignments by or to such Lender pursuant to Section 9.04. The initial amount of each Lender’s Commitment is set forth on Schedule 2.01, or in the Assignment and Assumption pursuant to which such Lender shall have assumed its Commitment, as applicable. The initial aggregate amount of the Lenders’ Commitments is $3,000,000,000.

“ Consolidated Net Worth ” means at any date, all amounts that would, in conformity with GAAP, be included on a consolidated balance sheet of the Borrower and its Subsidiaries under shareholders’ equity at such date.

“ Control ” means the possession, directly or indirectly, of the power to direct or cause the direction of the management or policies of a Person, whether through the ability to exercise voting power, by contract or otherwise. “ Controlling ” and “ Controlled ” have meanings correlative thereto.

“ Default ” means any of the events specified in Article VII whether or not any requirement for the giving of notice, lapse of time or both has been satisfied.

“ dollars ” or “ $ ” refers to lawful money of the United States of America.

“ Effective Date ” means the date on which the conditions specified in Section 4.01 are satisfied (or waived in accordance with Section 9.02).

“ Environmental Laws ” means all laws, rules, regulations, codes, ordinances, orders, decrees, judgments, injunctions, notices or binding agreements issued, promulgated or entered into by any Governmental Authority, relating in any way to the environment, preservation or reclamation of natural resources, the management, release or threatened release of any Hazardous Material or to health and safety matters.

“ Equity Interests ” means shares of capital stock, partnership interests, membership interests in a limited liability company, beneficial interests in a trust or other equity ownership interests in a Person, and any warrants, options or other rights entitling the holder thereof to purchase or acquire any such equity interest.

“ ERISA ” means the Employee Retirement Income Security Act of 1974, as amended from time to time.

“ ERISA Affiliate ” means any trade or business (whether or not incorporated) that, together with the Borrower, is treated as a single employer under Section 414(b) or (c) of the Code or, solely for purposes of Section 302 of ERISA and Section 412 of the Code, is treated as a single employer under Section 414 of the Code.

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“ ERISA Event ” means (a) any “reportable event”, as defined in Section 4043 of ERISA or the regulations issued thereunder with respect to a Plan (other than an event for which the 30-day notice period is waived); (b) the existence with respect to any Plan of an “accumulated funding deficiency” (as defined in Section 412 of the Code or Section 302 of ERISA), whether or not waived; (c) the filing pursuant to Section 412(d) of the Code or Section 303(d) of ERISA of an application for a waiver of the minimum funding standard with respect to any Plan; (d) the incurrence by the Borrower or any of its ERISA Affiliates of any liability under Title IV of ERISA with respect to the termination of any Plan; (e) the receipt by the Borrower or any ERISA Affiliate from the PBGC or a plan administrator of any notice relating to an intention to terminate any Plan or Plans or to appoint a trustee to administer any Plan; (f) the incurrence by the Borrower or any of its ERISA Affiliates of any liability with respect to the withdrawal or partial withdrawal from any Plan or Multiemployer Plan; or (g) the receipt by the Borrower or any ERISA Affiliate of any notice, or the receipt by any Multiemployer Plan from the Borrower or any ERISA Affiliate of any notice, concerning the imposition of Withdrawal Liability or a determination that a Multiemployer Plan is, or is expected to be, insolvent or in reorganization, within the meaning of Title IV of ERISA.

“ Eurodollar ”, when used in reference to any Loan or Borrowing, refers to whether such Loan, or the Loans comprising such Borrowing, are bearing interest at a rate determined by reference to the Adjusted LIBOR Rate.

“ Event of Default ” has the meaning assigned to such term in Article VII.

“ Excluded Taxes ” means, with respect to the Administrative Agent, any Lender or any other recipient of any payment to be made by or on account of any obligation of the Borrower hereunder (for purposes of this definition, a “Lender”), (a) income or franchise taxes imposed on (or measured by) its net income by the United States of America, or by the jurisdiction under the laws of which such recipient is organized or in which its principal office is located or in which it is otherwise subject to such taxation (other than a jurisdiction in which such Person would not have been subject to such tax but for and solely as a result of its execution and delivery of this Agreement or its exercise of its rights or performance of its obligations hereunder) or, in the case of any Lender, in which its applicable lending office is located, (b) any branch profits taxes imposed by the United States of America or any similar tax imposed by any other jurisdiction in which the Borrower is located, (c) any withholding tax (other than with respect to an assignee pursuant to a request by the Borrower under Section 2.16(b)) (i) except to the extent that it would not have been imposed but for and solely as a result of a change in the Borrower’s circumstances or a change in law occurring after the time such Foreign Lender becomes a party to this Agreement (or designates a new lending office) or acquires its interest herein, except to the extent that such Foreign Lender (or its assignor, if any) was entitled, at the time of designation of a new lending office (or assignment), to receive additional amounts from the Borrower with respect to such withholding tax pursuant to Section 2.14(a) or (ii) attributable to such Foreign Lender’s or the Administrative Agent’s failure to comply with Section 2.14(e), and (d) backup withholding taxes imposed under section 3406 of the Code.

“ Federal Funds Effective Rate ” means, for any day, the rate per annum equal to the weighted average (rounded upwards, if necessary, to the next 1/100 of 1%) of the rates on overnight Federal funds transactions with members of the Federal Reserve System arranged by Federal funds brokers, as published on the next succeeding Business Day by the Federal Reserve Bank of New York, or, if such rate is not so published for any day that is a Business Day, the average (rounded upwards, if necessary, to the next 1/100 of 1%) of the quotations for such day for such transactions received by the Administrative Agent from three Federal funds brokers of recognized standing selected by it.

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“ Financial Officer ” means the chief financial officer, chief accounting officer, treasurer or controller of the Borrower.

“ Foreign Lender ” means any Lender that is organized under the laws of a jurisdiction other than that in which the Borrower is located. For purposes of this definition, the United States of America, each State thereof and the District of Columbia shall be deemed to constitute a single jurisdiction.

“ GAAP ” means generally accepted accounting principles in the United States of America.

“ GFX ” means GFX Corporation.

“ GFX Guaranty ” means certain Guarantees by the Borrower or any Subsidiaries issued to counterparties of GFX in respect of over-the-counter foreign exchange transactions entered into by GFX, or certain Guarantees by the Borrower or any Subsidiary issued to a banking institution that has provided performance bond collateral, or met performance bond or variation margin obligations on behalf of, or issued letters of credit for the account of, GFX, in respect of such transactions.

“ Governmental Authority ” means the government of the United States of America, any other nation or any political subdivision thereof, whether state or local, and any agency, authority, instrumentality, regulatory body, court, central bank or other entity exercising executive, legislative, judicial, taxing, regulatory or administrative powers or functions of or pertaining to government.

“ Guarantee ” of or by any Person (the “ guarantor ”) means any obligation, contingent or otherwise, of the guarantor guaranteeing or having the economic effect of guaranteeing any Indebtedness of any other Person (the “ primary obligor ”) in any manner, and including any obligation of the guarantor (a) to purchase or pay (or advance or supply funds for the purchase or payment of) such Indebtedness or to purchase (or to advance or supply funds for the purchase of) any security for the payment thereof, (b) to purchase or lease property, securities or services for the purpose of assuring the owner of such Indebtedness of the payment thereof, (c) to maintain working capital, equity capital or any other financial statement condition or liquidity of the primary obligor so as to enable the primary obligor to pay such Indebtedness or (d) as an account party in respect of any letter of credit issued to support such Indebtedness; provided , that the term “Guarantee” shall not include endorsements for collection or deposit in the ordinary course of business.

“ Hazardous Materials ” means all explosive or radioactive substances or wastes and all hazardous or toxic substances, wastes or other pollutants, including petroleum or petroleum distillates, asbestos or asbestos containing materials, polychlorinated biphenyls, radon gas, infectious or medical wastes and all other substances or wastes of any nature regulated pursuant to any Environmental Law.

“ Indebtedness ” of any Person means, without duplication, (a) all obligations of such Person for borrowed money (other than a daylight overdraft incurred by such Person), (b) all obligations of such Person evidenced by bonds, debentures, notes or similar instruments, (c) all obligations of such Person under conditional sale or other title retention agreements relating to property acquired by such Person, (d) all obligations of such Person in respect of the deferred purchase price of property or services (excluding accounts payable incurred in the ordinary course of business), (e) all Indebtedness of others secured by (or for which the holder of such Indebtedness has an existing right, contingent or otherwise, to be secured by) any Lien on property owned or acquired by such Person, whether or not the Indebtedness

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secured thereby has been assumed, (f) all Guarantees by such Person of Indebtedness of others, (g) all Capital Lease Obligations of such Person, (h) all obligations, contingent or otherwise, of such Person as an account party in respect of letters of credit and (i) all obligations, contingent or otherwise, of such Person in respect of bankers’ acceptances. The Indebtedness of any Person shall include the Indebtedness of any other entity (including any partnership in which such Person is a general partner) to the extent such Person is liable therefor as a result of such Person’s ownership interest in or other relationship with such entity, except to the extent the terms of such Indebtedness provide that such Person is not liable therefor.

“ Indemnified Taxes ” means Taxes other than Excluded Taxes.

“ Interest Election Request ” means a request by the Borrower to convert or continue a Borrowing in accordance with Section 2.05.

“ Interest Payment Date ” means (a) with respect to any Base Rate Loan, the last day of each March, June, September and December, and (b) with respect to any Eurodollar Loan, the last day of the Interest Period applicable to the Borrowing of which such Loan is a part and, in the case of a Eurodollar Borrowing with an Interest Period of more than three months’ duration, each day prior to the last day of such Interest Period that occurs at intervals of three months’ duration after the first day of such Interest Period.

“ Interest Period ” means with respect to any Eurodollar Borrowing, the period commencing on the date of such Borrowing and ending on the numerically corresponding day in the calendar month that is one, two, three or six months thereafter, as the Borrower may elect; provided , that (i) if any Interest Period would end on a day other than a Business Day, such Interest Period shall be extended to the next succeeding Business Day unless such next succeeding Business Day would fall in the next calendar month, in which case such Interest Period shall end on the next preceding Business Day and (ii) any Interest Period pertaining to a Eurodollar Borrowing that commences on the last Business Day of a calendar month (or on a day for which there is no numerically corresponding day in the last calendar month of such Interest Period) shall end on the last Business Day of the last calendar month of such Interest Period. For purposes hereof, the date of a Borrowing initially shall be the date on which such Borrowing is made and, in the case of a Borrowing, thereafter shall be the effective date of the most recent conversion or continuation of such Borrowing.

“ Lenders ” means the Persons listed on Schedule 2.01 and any other Person that shall have become a party hereto pursuant to an Assignment and Assumption, other than any such Person that ceases to be a party hereto pursuant to an Assignment and Assumption.

“ LIBOR Rate ” means, with respect to any Eurodollar Borrowing for any Interest Period, the rate appearing on Page 3750 of the Dow Jones Market Service (or on any successor or substitute page of such service, or any successor to or substitute for such service, providing rate quotations comparable to those currently provided on such page of such service, as determined by the Administrative Agent from time to time for purposes of providing quotations of interest rates applicable to dollar deposits in the London interbank market) at approximately 11:00 a.m., London time, two Business Days prior to the commencement of such Interest Period, as the rate for dollar deposits with a maturity comparable to such Interest Period. In the event that such rate is not available at such time for any reason, then the “ LIBOR Rate ” with respect to such Eurodollar Borrowing for such Interest Period shall be the arithmetic average (rounded upward, if necessary, to the next higher 1/100 ^th of 1%) of rates quoted by not fewer than two (2) major banks in New York City, selected by the Administrative Agent (which banks may include the principal New York City office of the Administrative Agent), in an amount comparable to the principal amount of the applicable Loan and with a maturity comparable to such Interest Period at approximately 10:00 a.m., New York City time, two Business Days prior to the commencement of such Interest Period.

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“ Lien ” means, with respect to any asset, (a) any mortgage, deed of trust, lien, pledge, hypothecation, encumbrance, charge or security interest in, on or of such asset and (b) the interest of a vendor or a lessor under any conditional sale agreement, capital lease or title retention agreement (or any financing lease having substantially the same economic effect as any of the foregoing) relating to such asset.

“ Loans ” means the loans made by the Lenders to the Borrower pursuant to this Agreement.

“ Margin Regulations ” means Regulations T, U and X of the Board as amended and in effect from time to time.

“ Material Adverse Effect ” means a material adverse effect on the business or financial condition of the Borrower and the Subsidiaries taken as a whole.

“ Material Indebtedness ” means Indebtedness (other than the Loans), or obligations in respect of one or more Swap Agreements, of any one or more of the Borrower and its Subsidiaries in an aggregate principal amount exceeding $100,000,000. For purposes of determining Material Indebtedness, the “principal amount” of the obligations of the Borrower or any Subsidiary in respect of its Swap Agreements at any time shall be the net aggregate amount (giving effect to any netting agreements) that the Borrower or such Subsidiary would be required to pay if such Swap Agreements were terminated at such time.

“ Maturity Date ” means July 25, 2008.

“ Merger ” means the merger of the Target with and into the Borrower (with the survivor company being renamed CME Group Inc.).

“ Merger Agreement ” means the Agreement and Plan of Merger among the Borrower, the Target and Board of Trade of the City of Chicago, Inc., dated as of October 17, 2006, as amended by the first amendment thereto, dated as of December 2006, as further amended by the second amendment thereto, dated as of May 1, 2007, as further amended by the third amendment thereto, dated as of June 14, 2007, and as further amended by the fourth amendment thereto, dated as of July 6, 2007 (and as may be further amended waived, restated, supplemented or otherwise modified from time, but without giving effect to any further amendments or any restatements, waivers, supplements or other modifications, in each case that are materially adverse to the Lenders without the consent of the Arranger).

“ Moody’s ” means Moody’s Investors Service, Inc.

“ Multiemployer Plan ” means a multiemployer plan as defined in Section 4001(a) (3) of ERISA.

“ Net Cash Proceeds ” means, in connection with any issuance or sale of Equity Interests or the incurrence of Indebtedness (including a Capital Lease entered into in connection with a sale and leaseback transaction), the cash proceeds received from such issuance or incurrence (in the case of a Capital Lease entered into in connection with a sale and leaseback transaction, constituting the cash proceeds received from such sale) net of (a) attorneys’ fees, investment banking fees, accountants’ fees, underwriting discounts and commissions and other customary fees and expenses actually incurred in connection therewith, (b) the amount of all payments required to be made by the Borrower and its Subsidiaries as a result of such sale to repay Indebtedness (other than the Loans) secured by such asset or

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otherwise subject to mandatory prepayment as a result of such sale, (c) the amount of any reserves established by the Borrower and the Subsidiaries to fund contingent liabilities reasonably estimated to be payable, in each case that are attributable to such event, as reasonably determined by the Borrower and (d) Taxes incurred in connection therewith or any transaction occurring, or for taxation purposes, deemed to occur to effect a required prepayment hereunder.

“ Other Taxes ” means any and all present or future stamp or documentary taxes or any other excise or property taxes, charges or similar levies arising from any payment made hereunder or from the execution, delivery or enforcement of, or otherwise with respect to, this Agreement, excluding, however, such amounts imposed as a result of an assignment or other transfer (other than an assignment or other transfer that occurs as a result of the Borrower’s request pursuant to Section 2.16).

“ Participant ” has the meaning set forth in Section 9.04.

“ PBGC ” means the Pension Benefit Guaranty Corporation referred to and defined in ERISA and any successor entity performing similar functions.

“ Permitted Encumbrances ” means:

(a) Liens imposed by law for taxes, assessments, levies or governmental charges of any Governmental Authority, in each case that are not yet overdue by more than 60 days or are being contested in good faith (and, if necessary, by appropriate proceedings) for which adequate reserves have been established in accordance with GAAP;

(b) Liens imposed by law or which arise by operation of law and which are incurred in the ordinary course of business, such as carriers’, warehousemen’s, materialmen’s, repairmen’s and mechanics’ liens, and landlords’ liens;

(c) Liens incurred or pledges or deposits made in the ordinary course of business in compliance with workers’ compensation, unemployment insurance and other social security laws or regulations;

(d) Liens incurred or pledges or deposits made to secure the performance of bids, trade contracts, tenders, leases, statutory obligations, surety, customs and appeal bonds, performance bonds, customer deposits and other obligations of a similar nature, in each case in the ordinary course of business;

(e) judgment liens in respect of judgments that do not constitute an Event of Default under clause (k) of Article VII;

(f) easements, zoning restrictions, rights-of-way, leases, subleases and similar charges, minor defects or irregularities in title and other similar encumbrances on the real property of such Person imposed by law or arising in the ordinary course of business that do not secure any monetary obligations (other than customary maintenance requirements) and which could not reasonably be expected to have a Material Adverse Effect;

(g) statutory and common law rights of set-off and other similar rights and remedies as to deposits of cash, securities, commodities and other funds in favor of banks, other depositary institutions, securities or commodities intermediaries or brokerage;

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(h) Liens of a collecting bank arising in the ordinary course of business under Section 4-208 of the Uniform Commercial Code in effect in the relevant jurisdiction and covering only the items being collected upon;

(i) Liens of sellers of goods to the Borrower or a Subsidiary arising under Article 2 of the Uniform Commercial Code in effect in the relevant jurisdiction or similar provisions of applicable law in the ordinary course of business;

(j) any interest or title of a lessor, licensor or sublessor under any lease, license or sublease (other than a Capital Lease or Synthetic Lease) entered into by the Borrower or a Subsidiary in the ordinary course of business;

(k) leases or subleases of personal property of the Borrower or a Subsidiary or licenses of patents, trademarks, copyrights or other intellectual property rights of the Borrower or any Subsidiary granted in the ordinary course of business and which could not reasonably be expected to have a Material Adverse Effect; and

(l) Liens consisting of an agreement to sell, transfer or dispose of any asset (to the extent such sale, transfer or disposition is not prohibited by this Agreement);

provided that the term “Permitted Encumbrances” shall not include any Lien securing Indebtedness.

“ Person ” means any natural person, corporation, limited liability company, trust, joint venture, association, company, partnership, Governmental Authority or other entity.

“ Plan ” means any employee pension benefit plan (other than a Multiemployer Plan) subject to the provisions of Title IV of ERISA or Section 412 of the Code or Section 302 of ERISA, and in respect of which the Borrower or any ERISA Affiliate is (or, if such plan were terminated, would under Section 4069 of ERISA be deemed to be) an “employer” as defined in Section 3(5) of ERISA.

“ Prime Rate ” means the prime lending rate as set forth on the British Banking Association Telerate Page 5 (or such other comparable publicly available page as may, in the reasonable opinion of the Administrative Agent after notice to the Borrower, replace such page for the purpose of displaying such rate if such rate no longer appears on the British Bankers Association Telerate page 5), as in effect from time to time. The Prime Rate is a reference rate and does not necessarily represent the lowest or best rate actually available.

“ Register ” has the meaning set forth in Section 9.04.

“ Related Parties ” means, with respect to any specified Person, such Person’s Affiliates and the respective directors, officers, employees, agents and advisors of such Person and such Person’s Affiliates.

“ Required Lenders ” means, at any time, Lenders having Revolving Credit Exposures and unused Commitments representing more than 50% of the sum of the total Revolving Credit Exposures and unused Commitments at such time.

“ Revolving Credit Exposure ” means, with respect to any Lender at any time, the sum of the outstanding principal amount of such Lender’s Loans.

“ S&P ” means Standard & Poor’s Ratings Group.

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“ Senior Officer ” means the chief executive officer, president, any managing director, any corporate secretary, or any Financial Officer of the Borrower.

“ SGX Mutual Offset Agreement ” means an agreement between Chicago Mercantile Exchange Inc. and Singapore Exchange Limited (“SGX”) which allows trades in certain fungible products (i.e. “Eurodollars”) executed at one exchange to be transferred to the other exchange for liquidation. The mutual offset arrangement is designed to allow futures traders to manage overnight risk.

“ Share Repurchase Offer ” means an offer by the company surviving the Merger to purchase pursuant to a tender offer, as promptly as practicable following the date on which the Merger has been consummated and substantially in accordance with all applicable laws and regulations, up to 6,250,000 shares of CME Holdings Class A Common Stock at a fixed cash price of $560 per share.

“ Significant Subsidiary ” means any Subsidiary of the Borrower having, as of the end of the Borrower’s most recently completed fiscal year, (a) assets with a value of not less than 10% of the total value of the assets of the Borrower and its Subsidiaries, taken as a whole, or (b) income from continuing operations before income taxes, extraordinary items and cumulative effect of a change in accounting principles of not less than 10% of such income of the Borrower and its Subsidiaries, taken as a whole.

“ subsidiary ” means, with respect to any Person (the “ parent ”) at any date, any corporation, limited liability company, partnership, association or other entity the accounts of which would be consolidated with those of the parent in the parent’s consolidated financial statements if such financial statements were prepared in accordance with GAAP as of such date, as well as any other corporation, limited liability company, partnership, association or other entity of which securities or other ownership interests representing more than 50% of the equity or more than 50% of the ordinary voting power or, in the case of a partnership, more than 50% of the general partnership interests are, as of such date, owned, controlled or held.

“ Subsidiary ” means any subsidiary of the Borrower.

“ Swap Agreement ” means any agreement with respect to any swap, forward, future, credit attributes or derivative transaction or option or similar agreement involving, or settled by reference to, one or more rates, currencies, commodities, equity or debt instruments or securities, or economic, financial or pricing indices or measures of economic, financial or pricing risk or value or any similar transaction or any combination of these transactions; provided that no phantom stock or similar plan providing for payments only on account of services provided by, or salary deferred by, current or former directors, officers, employees or consultants of the Borrower or the Subsidiaries shall be a Swap Agreement.

“ Synthetic Lease ” means any tax retention or other synthetic lease which is treated as an operating lease under GAAP but the liabilities under which are or would be characterized as indebtedness of such Person for tax purposes.

“ Synthetic Lease Obligations ” of any Person means the obligations of such Person to pay rent or other amounts under any Synthetic Lease.

“ Target ” means CBOT Holdings Inc.

“ Taxes ” means any and all present or future taxes, levies, imposts, duties, deductions, charges or withholdings imposed by any Governmental Authority.

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“ Transactions ,” with respect to any date, means the execution, delivery and performance by the Borrower of this Agreement, the borrowing of Loans on and as of such date and the use of the proceeds thereof.

“ Type ”, when used in reference to any Loan or Borrowing, refers to whether the rate of interest on such Loan, or on the Loans comprising such Borrowing, is determined by reference to the Adjusted LIBOR Rate or the Base Rate.

“ Withdrawal Liability ” means liability to a Multiemployer Plan as a result of a complete or partial withdrawal from such Multiemployer Plan, as such terms are defined in Part I of Subtitle E of Title IV of ERISA.

SECTION 1.02. Classification of Loans and Borrowings. For purposes of this Agreement, Loans and Borrowings may be classified and referred by Type.

SECTION 1.03. Terms Generally. The definitions of terms herein shall apply equally to the singular and plural forms of the terms defined. Whenever the context may require, any pronoun shall include the corresponding masculine, feminine and neuter forms. The words “include”, “includes” and “including” shall be deemed to be followed by the phrase “without limitation”. The word “will” shall be construed to have the same meaning and effect as the word “shall”. Unless the context requires otherwise (a) any definition of or reference to any agreement, instrument or other document herein shall be construed as referring to such agreement, instrument or other document as from time to time amended, supplemented or otherwise modified (subject to any restrictions on such amendments, supplements or modifications set forth herein), (b) any reference herein to any Person shall be construed to include such Person’s successors and assigns, (c) the words “herein”, “hereof” and “hereunder”, and words of similar import, shall be construed to refer to this Agreement in its entirety and not to any particular provision hereof, (d) all references herein to Articles, Sections, Exhibits and Schedules shall be construed to refer to Articles and Sections of, and Exhibits and Schedules to, this Agreement and (e) the words “asset” and “property” shall be construed to have the same meaning and effect and to refer to any and all tangible and intangible assets and properties, including cash, securities, accounts and contract rights.

SECTION 1.04. Accounting Terms; GAAP. Except as otherwise expressly provided herein, all terms of an accounting or financial nature shall be construed in accordance with GAAP, as in effect from time to time; provided that, if the Borrower notifies the Administrative Agent that the Borrower requests an amendment to any provision hereof to eliminate the effect of any change occurring after the date hereof in GAAP or in the application thereof on the operation of such provision (or if the Administrative Agent notifies the Borrower that the Required Lenders request an amendment to any provision hereof for such purpose), regardless of whether any such notice is given before or after such change in GAAP or in the application thereof, then such provision shall be interpreted on the basis of GAAP as in effect and applied immediately before such change shall have become effective until such notice shall have been withdrawn or such provision amended in accordance herewith.

ARTICLE II

The Credits

SECTION 2.01. Commitments. Subject to the terms and conditions set forth herein, each Lender agrees to make Loans to the Borrower from time to time during the Availability Period in an aggregate principal amount that will not result in (a) such Lender’s Revolving Credit Exposure exceeding

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such Lender’s Commitment or (b) the aggregate Revolving Credit Exposures exceeding the aggregate Commitments. Within the foregoing limits and subject to the terms and conditions set forth herein, the Borrower may borrow, prepay and reborrow Loans.

SECTION 2.02. Loans and Borrowings. (a) Each Loan shall be made as part of a Borrowing consisting of Loans made by the Lenders ratably in accordance with their respective Commitments. The failure of any Lender to make any Loan required to be made by it shall not relieve any other Lender of its obligations hereunder; provided that the Commitments of the Lenders are several and no Lender shall be responsible for any other Lender’s failure to make Loans as required.

(b) Subject to Section 2.11, each Borrowing shall be comprised entirely of Base Rate Loans or Eurodollar Loans as the Borrower may request in accordance herewith. Each Lender at its option may make any Eurodollar Loan by causing any domestic or foreign branch or Affiliate of such Lender to make such Loan; provided that any exercise of such option shall not affect the obligation of the Borrower to repay such Loan in accordance with the terms of this Agreement.

(c) At the commencement of each Interest Period for any Eurodollar Borrowing, such Borrowing shall be in an aggregate amount that is an integral multiple of $1,000,000 and not less than $5,000,000. At the time that each Base Rate Borrowing is made, such Borrowing shall be in an aggregate amount that is an integral multiple of $1,000,000 and not less than $1,000,000; provided that a Base Rate Borrowing may be in an aggregate amount that is equal to the entire unused balance of the total Commitments. Borrowings of more than one Type may be outstanding at the same time; provided that there shall not at any time be more than a total of 10 Eurodollar Borrowings outstanding.

(d) Notwithstanding any other provision of this Agreement, the Borrower shall not be entitled to request, or to elect to convert or continue, any Borrowing if the Interest Period requested with respect thereto would end after the Maturity Date.

SECTION 2.03. Requests for Borrowings. To request a Borrowing, the Borrower shall notify the Administrative Agent of such request by telephone (a) in the case of a Eurodollar Borrowing, not later than 11:00 a.m., New York City time, three Business Days before the date of the proposed Borrowing or (b) in the case of a Base Rate Borrowing, not later than 11:00 a.m., New York City time, on the date of the proposed Borrowing. Each such telephonic Borrowing Request shall be irrevocable and shall be confirmed promptly by hand delivery or telecopy to the Administrative Agent of a written Borrowing Request in substantially the form of Exhibit C or otherwise in a form approved by the Administrative Agent and signed by the Borrower. Each such telephonic and written Borrowing Request shall specify the following information in compliance with Section 2.02:

(i) the aggregate amount of the requested Borrowing;

(ii) the date of such Borrowing, which shall be a Business Day;

(iii) whether such Borrowing is to be a Base Rate Borrowing or a Eurodollar Borrowing;

(iv) in the case of a Eurodollar Borrowing, the initial Interest Period to be applicable thereto, which shall be a period contemplated by the definition of the term “Interest Period”; and

(v) the location and number of the Borrower’s account to which funds are to be disbursed, which shall comply with the requirements of Section 2.04.

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If no election as to the Type of Borrowing is specified, then the requested Borrowing shall be a Base Rate Borrowing. If no Interest Period is specified with respect to any requested Eurodollar Borrowing, then the Borrower shall be deemed to have selected an Interest Period of one month’s duration. Promptly following receipt of a Borrowing Request in accordance with this Section 2.03, the Administrative Agent shall advise each Lender of the details thereof and of the amount of such Lender’s Loan to be made as part of the requested Borrowing.

SECTION 2.04. Funding of Borrowings. (a) Each Lender shall make each Loan to be made by it hereunder on the proposed date thereof by wire transfer of immediately available funds by 12:00 noon, New York City time, to the account of the Administrative Agent most recently designated by it for such purpose by notice to the Lenders. The Administrative Agent will make such Loans available to the Borrower by promptly crediting the amounts so received, in like funds, to an account of the Borrower designated by the Borrower in the applicable Borrowing Request.

(b) Unless the Administrative Agent shall have received notice from a Lender prior to the proposed date of any Borrowing that such Lender will not make available to the Administrative Agent such Lender’s share of such Borrowing, the Administrative Agent may assume that such Lender has made such share available on such date in accordance with paragraph (a) of this Section 2.04 and may, in reliance upon such assumption, make available to the Borrower a corresponding amount. In such event, if a Lender has not in fact made its share of the applicable Borrowing available to the Administrative Agent, then the applicable Lender and the Borrower severally agree to pay to the Administrative Agent forthwith on demand such corresponding amount with interest thereon, for each day from and including the date such amount is made available to the Borrower to but excluding the date of payment to the Administrative Agent, at (i) in the case of such Lender, the greater of the Federal Funds Effective Rate and a rate determined by the Administrative Agent in accordance with banking industry rules on interbank compensation or (ii) in the case of the Borrower, the interest rate applicable to Base Rate Loans. If such Lender pays such amount to the Administrative Agent, then such amount shall constitute such Lender’s Loan included in such Borrowing. Nothing herein shall be deemed to relieve any Lender from its duty to fulfill its obligations hereunder or to prejudice any rights which the Borrower may have against any Lender as a result of any default by such Lender hereunder.

SECTION 2.05. Interest Elections. (a) Each Borrowing initially shall be of the Type specified in the applicable Borrowing Request and, in the case of a Eurodollar Borrowing, shall have an initial Interest Period as specified in such Borrowing Request. Thereafter, the Borrower may elect to convert such Borrowing to a different Type or to continue such Borrowing and, in the case of a Eurodollar Borrowing, may elect Interest Periods therefor, all as provided in this Section 2.05. The Borrower may elect different options with respect to different portions of the affected Borrowing, in which case each such portion shall be allocated ratably among the Lenders holding the Loans comprising such Borrowing, and the Loans comprising each such portion shall be considered a separate Borrowing.

(b) To make an election pursuant to this Section 2.05, the Borrower shall notify the Administrative Agent of such election by telephone by the time that a Borrowing Request would be required under Section 2.03 if the Borrower were requesting a Borrowing of the Type resulting from such election to be made on the effective date of such election. Each such telephonic Interest Election Request shall be irrevocable and shall be confirmed promptly by hand delivery or telecopy to the Administrative Agent of a written Interest Election Request in a form approved by the Administrative Agent and signed by the Borrower.

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(c) Each telephonic and written Interest Election Request shall specify the following information in compliance with Section 2.02:

(i) the Borrowing to which such Interest Election Request applies and, if different options are being elected with respect to different portions thereof, the portions thereof to be allocated to each resulting Borrowing (in which case the information to be specified pursuant to clauses (iii) and (iv) below shall be specified for each resulting Borrowing);

(ii) the effective date of the election made pursuant to such Interest Election Request, which shall be a Business Day;

(iii) whether the resulting Borrowing is to be a Base Rate Borrowing or a Eurodollar Borrowing; and

(iv) if the resulting Borrowing is a Eurodollar Borrowing, the Interest Period to be applicable thereto after giving effect to such election, which shall be a period contemplated by the definition of the term “Interest Period”.

If any such Interest Election Request requests a Eurodollar Borrowing but does not specify an Interest Period, then the Borrower shall be deemed to have selected an Interest Period of one month’s duration.

(d) Promptly following receipt of an Interest Election Request, the Administrative Agent shall advise each Lender of the details thereof and of such Lender’s portion of each resulting Borrowing.

(e) If the Borrower fails to deliver a timely Interest Election Request with respect to a Eurodollar Borrowing prior to the end of the Interest Period applicable thereto, then, unless such Borrowing is repaid as provided herein, at the end of such Interest Period such Borrowing shall be converted to a Base Rate Borrowing. Notwithstanding any contrary provision hereof, if an Event of Default has occurred and is continuing and the Administrative Agent, at the request of the Required Lenders, so notifies the Borrower, then, so long as an Event of Default is continuing (i) no outstanding Borrowing may be converted to or continued as a Eurodollar Borrowing and (ii) unless repaid, each Eurodollar Borrowing shall be converted to a Base Rate Borrowing at the end of the Interest Period applicable thereto.

SECTION 2.06. Termination and Reduction of Commitments. (a) Unless previously terminated, the Commitments shall terminate on the Maturity Date.

(b) The Borrower may at any time, without premium or penalty, terminate, or from time to time reduce, the Commitments; provided that (i) each reduction of the Commitments shall be in an amount that is an integral multiple of $1,000,000 and not less than $5,000,000 and (ii) the Borrower shall not terminate or reduce the Commitments if, after giving effect to any concurrent prepayment of the Loans in accordance with Section 2.08, the aggregate Revolving Credit Exposures would exceed the aggregate Commitments.

(c) The Borrower shall notify the Administrative Agent of any election to terminate or reduce the Commitments under paragraph (b) of this Section 2.06 at least three Business Days prior to the effective date of such termination or reduction, specifying such election and the effective date thereof. Promptly following receipt of any notice, the Administrative Agent shall advise the Lenders of the contents thereof. Each notice delivered by the Borrower pursuant to this Section 2.06 shall be irrevocable; provided that a notice of termination of the Commitments delivered by the Borrower may state that such notice is conditioned upon the effectiveness of other credit facilities, in which case such notice may be revoked by the Borrower (by notice to the Administrative Agent on or prior to the specified effective date) if such condition is not satisfied. Any termination or reduction of the Commitments shall be permanent. Each reduction of the Commitments shall be made ratably among the Lenders in accordance with their respective Commitments.

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SECTION 2.07. Repayment of Loans; Evidence of Debt. (a) The Borrower hereby unconditionally promises to pay to the Administrative Agent for the account of each Lender the then unpaid principal amount of each Loan on the Maturity Date.

(b) Each Lender shall maintain in accordance with its usual practice an account or accounts evidencing the indebtedness of the Borrower to such Lender resulting from each Loan made by such Lender, including the amounts of principal and interest payable and paid to such Lender from time to time hereunder.

(c) The Administrative Agent shall maintain accounts in which it shall record (i) the amount of each Loan made hereunder, the Type thereof and the Interest Period applicable thereto, (ii) the amount of any principal or interest due and payable or to become due and payable from the Borrower to each Lender hereunder and (iii) the amount of any sum received by the Administrative Agent hereunder for the account of the Lenders and each Lender’s share thereof.

(d) The entries made in the accounts maintained pursuant to paragraph (b) or (c) of this Section 2.07 shall be prima facie evidence (absent manifest error) of the existence and amounts of the obligations recorded therein; provided that the failure of any Lender or the Administrative Agent to maintain such accounts or any error therein shall not in any manner affect the obligation of the Borrower to repay the Loans in accordance with the terms of this Agreement.

(e) Any Lender may request that Loans made by it be evidenced by a promissory note. In such event, the Borrower shall prepare, execute and deliver to such Lender a promissory note payable to such Lender (or, if requested by such Lender, to such Lender or its registered assigns) substantially in the form of Exhibit D hereto. Thereafter, the Loans evidenced by such promissory note and interest thereon shall at all times (including after assignment pursuant to Section 9.04) be represented by one or more promissory notes in such form payable to the payee named therein (or to such payee or its registered assigns).

SECTION 2.08. Prepayment of Loans. (a)  Optional Prepayments . The Borrower shall have the right at any time and from time to time, without premium or penalty, to prepay any Borrowing in whole or in part, subject to prior notice in accordance with paragraph (c) of this Section 2.07.

(b) Mandatory Prepayments . If any Equity Interests (including equity-linked securities and preferred equity, but excluding Equity Interests issued pursuant to any employee stock plan or issued to the Borrower or any Subsidiary) shall be issued or sold, or Indebtedness under clauses (a), (b) or, if such Net Cash Proceeds are received in connection with a Capital Lease entered into in connection with a sale and lease back transaction, clause (g) of the definition thereof incurred, by the Borrower or any of its Subsidiaries, then within 3 Business Days of the date of such issuance, sale or incurrence, the Loans shall be prepaid, and the Commitments shall be permanently reduced by an amount equal to the amount of the Net Cash Proceeds of such issuance, sale or incurrence (excluding (A) all Net Cash Proceeds from (w) the issuance of commercial paper by the Borrower, (x) any Indebtedness incurred by any such Subsidiary permitted by Section 6.02 (other than paragraph (m) thereof), (y) any Indebtedness incurred by the Borrower that it would have been permitted to incur in reliance on Section 6.02 (other than paragraph (m) thereof) if such Section including clauses (a) through (l) thereof applied to the Borrower and (z) any Indebtedness of the Borrower under this Agreement and (B) the first $25,000,000 of Net Cash Proceeds in the aggregate from the incurrence of Indebtedness under clause (a), (b) or, if such Net Cash Proceeds are received in connection with a Capital Lease entered into in connection with a sale and lease back transaction, clause (g) of the definition thereof received by the Borrower and/or any Subsidiary after the Effective Date).

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(c) Notice of Prepayments . The Borrower shall notify the Administrative Agent by telephone (confirmed by telecopy) of any prepayment hereunder (i) in the case of prepayment of a Eurodollar Borrowing, not later than 11:00 a.m., New York City time, three Business Days before the date of prepayment, or (ii) in the case of prepayment of a Base Rate Borrowing, not later than 11:00 a.m., New York City time, on the date of prepayment; provided that, if a notice of prepayment is given in connection with a conditional notice of termination of the Commitments as contemplated by Section 2.06, then such notice of prepayment may be revoked if such notice of termination is revoked in accordance with Section 2.06. Promptly following receipt of any such notice relating to a Borrowing, the Administrative Agent shall advise the Lenders of the contents thereof. Each partial prepayment of any Borrowing shall be in an amount that would be permitted in the case of an advance of a Borrowing of the same Type as provided in Section 2.02. Each prepayment of a Borrowing shall be applied ratably to the Loans included in the prepaid Borrowing. Prepayments shall be accompanied by accrued interest to the extent required by Section 2.10.

SECTION 2.09. Fees. (a) The Borrower agrees to pay to the Administrative Agent for the account of each Lender a facility fee, which shall accrue at a rate per annum equal to the Applicable Facility Fee Rate on the daily amount of the Commitment of such Lender (whether used or unused) during the period from and including the date hereof to but excluding the date on which such Commitment terminates; provided that, if such Lender continues to have any Revolving Credit Exposure after its Commitment terminates, then such facility fee shall continue to accrue on the daily amount of such Lender’s Revolving Credit Exposure from and including the date on which its Commitment terminates to but excluding the date on which such Lender ceases to have any Revolving Credit Exposure. Facility fees accrued through and including the last day of March, June, September and December of each year shall be payable on the third Business Day following such last day, commencing on the first such date to occur after the date hereof; provided that all such fees shall be payable on the date on which the Commitments terminate and any such fees accruing after the date on which the Commitments terminate shall be payable on demand. All facility fees shall be computed on the basis of a year of 360 days and shall be payable for the actual number of days elapsed (including the first day but excluding the last day).

(b) The Borrower agrees to pay to the Administrative Agent, for its own account, fees payable in the amounts and at the times separately agreed upon between the Borrower and the Administrative Agent.

(c) All fees payable hereunder shall be paid on the dates due, in immediately available funds, to the Administrative Agent for distribution, in the case of facility fees, to the Lenders. Fees paid shall not be refundable under any circumstances.

SECTION 2.10. Interest. (a) The Loans comprising each Base Rate Borrowing shall bear interest at the Base Rate.

(b) The Loans comprising each Eurodollar Borrowing shall bear interest at the LIBOR Rate for the Interest Period in effect for such Borrowing plus the Applicable Margin.

(c) Notwithstanding the foregoing, if any principal of or interest on any Loan or any fee or other amount payable by the Borrower hereunder is not paid when due, whether at stated maturity, upon acceleration or otherwise, such overdue amount shall bear interest, after as well as before judgment, at a rate per annum equal to 2% plus the rate applicable to Base Rate Loans as provided in paragraph (a) of this Section 2.10.

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(d) Accrued interest on each Loan shall be payable in arrears on each Interest Payment Date for such Loan and upon termination of the Commitments; provided that (i) interest accrued pursuant to paragraph (c) of this Section 2.10 shall be payable on demand, (ii) in the event of any repayment or prepayment of any Loan (other than a prepayment of a Base Rate Loan prior to the end of the Availability Period), accrued interest on the principal amount repaid or prepaid shall be payable on the date of such repayment or prepayment and (iii) in the event of any conversion of any Eurodollar Loan prior to the end of the current Interest Period therefor, accrued interest on such Loan shall be payable on the effective date of such conversion.

(e) All interest hereunder shall be computed on the basis of a year of 360 days, except that interest computed by reference to the Base Rate at times when the Base Rate is based on the Prime Rate shall be computed on the basis of a year of 365 days (or 366 days in a leap year), and in each case shall be payable for the actual number of days elapsed (including the first day but excluding the last day). The applicable Base Rate or Adjusted LIBOR Rate shall be determined by the Administrative Agent, and such determination shall be conclusive absent manifest error.

SECTION 2.11. Alternate Rate of Interest. If prior to the commencement of any Interest Period for a Eurodollar Borrowing:

(a) the Administrative Agent determines (which determination shall be conclusive absent manifest error) that, by reason of circumstances affecting the relevant market, adequate and reasonable means do not exist for ascertaining the Adjusted LIBOR Rate for such Interest Period; or

(b) the Administrative Agent is advised by the Required Lenders that, in the good faith determination of such Lenders, the Adjusted LIBOR Rate for such Interest Period will not adequately and fairly reflect the cost to such Lenders (or Lender) of making or maintaining their Loans (or its Loan) included in such Borrowing for such Interest Period;

then the Administrative Agent shall give notice thereof to the Borrower and the Lenders by telephone or telecopy as promptly as pra