GUARANTEE AND COLLATERAL AGREEMENT

Exhibit 10.3

GUARANTEE AND COLLATERAL AGREEMENT

made by

INTERACTIVE BROKERS GROUP LLC

and certain of its Subsidiaries

in favor of

JPMORGAN CHASE BANK, N.A., as
Administrative Agent

Dated as of May 19, 2006

TABLE OF CONTENTS

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GUARANTEE AND COLLATERAL AGREEMENT

GUARANTEE AND COLLATERAL AGREEMENT, dated as of May 19, 2006, made by each of the signatories hereto (together with any other entity that may become a party hereto as provided herein, the " Grantors "), in favor of JPMorgan Chase Bank, N.A., as Administrative Agent (in such capacity, the " Administrative Agent ") for the banks and other financial institutions or entities (the " Lenders ") from time to time parties to the Credit Agreement, dated as of May 19, 2006 (as amended, supplemented or otherwise modified from time to time, the " Credit Agreement "), among Interactive Brokers Group LLC (the "Borrower "), the Lenders, Harris, N.A., as syndication agent (the " Syndication Agent "), Citibank, N.A. and HSBC Bank USA, National Association, as co-syndication agents, and the Administrative Agent.

W I T N E S S E T H :

WHEREAS, pursuant to the Credit Agreement, the Lenders have severally agreed to make extensions of credit to the Borrower upon the terms and subject to the conditions set forth therein;

WHEREAS, the Borrower is a member of an affiliated group of companies that includes each other Grantor;

WHEREAS, the proceeds of the extensions of credit under the Credit Agreement will be used in part to enable the Borrower to make valuable transfers to one or more of the other Grantors in connection with the operation of their respective businesses;

WHEREAS, the Borrower and the other Grantors are engaged in related businesses, and each Grantor will derive substantial direct and indirect benefit from the making of the extensions of credit under the Credit Agreement; and

WHEREAS, it is a condition precedent to the obligation of the Lenders to make their respective extensions of credit to the Borrower under the Credit Agreement that the Grantors shall have executed and delivered this Agreement to the Administrative Agent for the ratable benefit of the Lenders;

NOW, THEREFORE, in consideration of the premises and to induce the Administrative Agent and the Lenders to enter into the Credit Agreement and to induce the Lenders to make their respective extensions of credit to the Borrower thereunder, each Grantor hereby agrees with the Administrative Agent, for the ratable benefit of the Lenders, as follows:

SECTION 1. DEFINED TERMS

1.1.      Definitions . (a) Unless otherwise defined herein, terms defined in the Credit Agreement and used herein shall have the meanings given to them in the Credit Agreement, and the following terms are used herein as defined in the New York UCC: Accounts, Certificated Security, Chattel Paper, Commercial Tort Claims, Documents, Equipment, Farm Products, Fixtures, General Intangibles, Instruments, Inventory, Letter-of-Credit Rights and Supporting Obligations.

(b)        The following terms shall have the following meanings:

" Agreement ": this Guarantee and Collateral Agreement, as the same may be amended, supplemented or otherwise modified from time to time.

" Borrower Obligations ": the collective reference to the unpaid principal of and interest on the Loans and all other obligations and liabilities of the Borrower (including, without limitation, interest accruing at the then applicable rate provided in the Credit Agreement after the maturity of the Loans and interest accruing at the then applicable rate provided in the Credit Agreement after the filing of any petition in bankruptcy, or the commencement of any insolvency, reorganization or like proceeding, relating to the Borrower, whether or not a claim for post-filing or post-petition interest is allowed in such proceeding) to the Administrative Agent or any Lender (or, in the case of any Specified Swap Agreement, any Affiliate of any Lender), whether direct or indirect, absolute or contingent, due or to become due, or now existing or hereafter incurred, which may arise under the Credit Agreement, this Agreement, the other Loan Documents, any Specified Swap Agreement or any other document made, delivered or given in connection with any of the foregoing, in each case whether on account of principal, interest, reimbursement obligations, fees, indemnities, costs, expenses or otherwise (including, without limitation, all fees and disbursements of counsel to the Administrative Agent or to the Lenders that are required to be paid by the Borrower pursuant to the terms of any of the foregoing agreements).

" Capital Stock ": any and all shares, interests, participations or other equivalents (however designated) of capital stock of a corporation, any and all equivalent ownership interests in a Person (other than a corporation) and any and all warrants, rights or options to purchase any of the foregoing, except for debt securities convertible or exchangeable into such capital stock.

" Collateral ": as defined in Section 3.

" Collateral Account ": any collateral account established by the Administrative Agent as provided in Section 6.1 or 6.4.

" Copyrights ": (i) all copyrights arising under the laws of the United States, any other country or any political subdivision thereof, whether registered or unregistered and whether published or unpublished (including, without limitation, those listed in Schedule 5 ), all registrations and recordings thereof, and all applications in connection therewith, including, without limitation, all registrations, recordings and applications in the United States Copyright Office, and (ii) the right to obtain all renewals thereof.

" Copyright Licenses ": any written agreement naming any Grantor as licensor or licensee (including, without limitation, those listed in Schedule 5 ), granting any right under any Copyright, including, without limitation, the grant of rights to manufacture, distribute, exploit and sell materials derived from any Copyright.

" Guarantor Obligations ": with respect to any Guarantor, all obligations and liabilities of such Guarantor which may arise under this Agreement (including, without limitation, Section 2) or any other Loan Document to which such Guarantor is a party, in each case whether on account of guarantee obligations, reimbursement obligations, fees, indemnities, costs, expenses or otherwise (including, without limitation, all fees and disbursements of counsel to the Administrative Agent or to the Lenders that are required to be paid by such Guarantor pursuant to the terms of this Agreement or any other Loan Document).

" Guarantors ": the collective reference to each Grantor (other than the Borrower).

" Intellectual Property ": the collective reference to all rights, priorities and privileges relating to intellectual property, whether arising under United States, multinational or foreign laws or otherwise, including, without limitation, the Copyrights, the Copyright Licenses, the Patents, the Patent Licenses, the Trademarks and the Trademark Licenses, and all rights to sue at law or in equity for any

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infringement or other impairment thereof, including the right to receive all proceeds and damages therefrom.

" Intercompany Note ": any promissory note evidencing loans made by any Grantor to the Borrower or any of its Subsidiaries.

" Investment Property ": the collective reference to (i) all "investment property" as such term is defined in Section 9-102(a)(49) of the New York UCC (other than any Shared Collateral) and (ii) whether or not constituting "investment property" as so defined, all Pledged Notes.

" Issuers ": the collective reference to each issuer of any Investment Property that is a Wholly Owned Subsidiary that is a Material Subsidiary.

" New York UCC ": the Uniform Commercial Code as from time to time in effect in the State of New York.

" Obligations ": (i) in the case of the Borrower, the Borrower Obligations, and (ii) in the case of each Guarantor, its Guarantor Obligations.

" Patents ": (i) all letters patent of the United States, any other country or any political subdivision thereof, all reissues and extensions thereof and all goodwill associated therewith, including, without limitation, any of the foregoing referred to in Schedule 5 , (ii) all applications for letters patent of the United States or any other country and all divisions, continuations and continuations-in-part thereof, including, without limitation, any of the foregoing referred to in Schedule 5 , and (iii) all rights to obtain any reissues or extensions of the foregoing.

" Patent License ": all agreements, whether written or oral, providing for the grant by or to any Grantor of any right to manufacture, use or sell any invention covered in whole or in part by a Patent, including, without limitation, any of the foregoing referred to in Schedule 5 .

" Pledged Notes ": all promissory notes listed on Schedule 2 and all Intercompany Notes at any time issued to any Grantor.

" Proceeds ": all "proceeds" as such term is defined in Section 9-102(a)(64) of the New York UCC and, in any event, shall include, without limitation, all dividends or other income from the Investment Property, collections thereon or distributions or payments with respect thereto.

" Receivable ": any right to payment for goods sold or leased or for services rendered, whether or not such right is evidenced by an Instrument or Chattel Paper and whether or not it has been earned by performance (including, without limitation, any Account).

" Securities Act ": the Securities Act of 1933, as amended.

" Shared Collateral ": the collateral pledged pursuant to the Pledge and Collateral Agency Agreement.

" Trademarks ": (i) all trademarks, trade names, corporate names, company names, business names, fictitious business names, trade styles, service marks, logos and other source or business identifiers, and all goodwill associated therewith, now existing or hereafter adopted or acquired, all registrations and recordings thereof, and all applications in connection therewith, whether in the United States Patent and Trademark Office or in any similar office or agency of the United States, any State

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thereof or any other country or any political subdivision thereof, or otherwise, and all common-law rights related thereto, including, without limitation, any of the foregoing referred to in Schedule 5 , and (ii) the right to obtain all renewals thereof.

" Trademark License ": any agreement, whether written or oral, providing for the grant by or to any Grantor of any right to use any Trademark, including, without limitation, any of the foregoing referred to in Schedule 5 .

" Vehicles ": all cars, trucks, trailers, construction and earth moving equipment and other vehicles covered by a certificate of title law of any state.

1.2.      Other Definitional Provisions . (a) The words "hereof," "herein", "hereto" and "hereunder" and words of similar import when used in this Agreement shall refer to this Agreement as a whole and not to any particular provision of this Agreement, and Section and Schedule references are to this Agreement unless otherwise specified.

(b)       The meanings given to terms defined herein shall be equally applicable to both the singular and plural forms of such terms.

(c)       Where the context requires, terms relating to the Collateral or any part thereof, when used in relation to a Grantor, shall refer to such Grantor’s Collateral or the relevant part thereof.

SECTION 2. GUARANTEE

2.1.      Guarantee . (a) Each of the Guarantors hereby, jointly and severally, unconditionally and irrevocably, guarantees to the Administrative Agent, for the ratable benefit of the Lenders, (and in the case of Specified Swap Agreements, Affiliates of Lenders), and their respective successors, indorsees, transferees and assigns, the prompt and complete payment and performance by the Borrower when due (whether at the stated maturity, by acceleration or otherwise) of the Borrower Obligations.

(b)       Anything herein or in any other Loan Document to the contrary notwithstanding, the maximum liability of each Guarantor hereunder and under the other Loan Documents shall in no event exceed the amount which can be guaranteed by such Guarantor under applicable federal and state laws relating to the insolvency of debtors (after giving effect to the right of contribution established in Section 2.2).

(c)       Each Guarantor agrees that the Borrower Obligations may at any time and from time to time exceed the amount of the liability of such Guarantor hereunder without impairing the guarantee contained in this Section 2 or affecting the rights and remedies of the Administrative Agent or any Lender hereunder.

(d)       The guarantee contained in this Section 2 shall remain in full force and effect until all the Borrower Obligations and the obligations of each Guarantor under the guarantee contained in this Section 2 shall have been satisfied by payment in full and the Revolving Commitments shall be terminated, notwithstanding that from time to time during the term of the Credit Agreement the Borrower may be free from any Borrower Obligations.

(e)       No payment made by the Borrower, any of the Guarantors, any other guarantor or any other Person or received or collected by the Administrative Agent or any Lender from the Borrower, any of the Guarantors, any other guarantor or any other Person by virtue of any action or proceeding or any set-off or appropriation or application at any time or from time to time in reduction of or in payment of

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the Borrower Obligations shall be deemed to modify, reduce, release or otherwise affect the liability of any Guarantor hereunder which shall, notwithstanding any such payment (other than any payment made by such Guarantor in respect of the Borrower Obligations or any payment received or collected from such Guarantor in respect of the Borrower Obligations), remain liable for the Borrower Obligations up to the maximum liability of such Guarantor hereunder until the Borrower Obligations are paid in full and the Revolving Commitments are terminated.

2.2.      Right of Contribution . Each Guarantor hereby agrees that to the extent that a Guarantor shall have paid more than its proportionate share of any payment made hereunder, such Guarantor shall be entitled to seek and receive contribution from and against any other Guarantor hereunder which has not paid its proportionate share of such payment. Each Guarantor right of contribution shall be subject to the terms and conditions of Section 2.3. The provisions of this Section 2.2 shall in no respect limit the obligations and liabilities of any Guarantor to the Administrative Agent and the Lenders, and each Guarantor shall remain liable to the Administrative Agent and the Lenders for the full amount guaranteed by such Guarantor hereunder.

2.3.      No Subrogation . Notwithstanding any payment made by any Guarantor hereunder or any set-off or application of funds of any Guarantor by the Administrative Agent or any Lender, no Guarantor shall be entitled to be subrogated to any of the rights of the Administrative Agent or any Lender against the Borrower or any other Guarantor or any collateral security or guarantee or right of offset held by the Administrative Agent or any Lender for the payment of the Borrower Obligations, nor shall any Guarantor seek or be entitled to seek any contribution or reimbursement from the Borrower or any other Guarantor in respect of payments made by such Guarantor hereunder, until all amounts owing to the Administrative Agent and the Lenders by the Borrower on account of the Borrower Obligations are paid in full and the Revolving Commitments are terminated. If any amount shall be paid to any Guarantor on account of such subrogation rights at any time when all of the Borrower Obligations shall not have been paid in full, such amount shall be held by such Guarantor in trust for the Administrative Agent and the Lenders, segregated from other funds of such Guarantor, and shall, forthwith upon receipt by such Guarantor, be turned over to the Administrative Agent in the exact form received by such Guarantor (duly indorsed by such Guarantor to the Administrative Agent, if required), to be applied against the Borrower Obligations, whether matured or unmatured, in such order as the Administrative Agent may determine.

2.4.      Amendments, etc. with respect to the Borrower Obligations . Each Guarantor shall remain obligated hereunder notwithstanding that, without any reservation of rights against any Guarantor and without notice to or further assent by any Guarantor, any demand for payment of any of the Borrower Obligations made by the Administrative Agent or any Lender may be rescinded by the Administrative Agent or such Lender and any of the Borrower Obligations continued, and the Borrower Obligations, or the liability of any other Person upon or for any part thereof, or any collateral security or guarantee therefor or right of offset with respect thereto, may, from time to time, in whole or in part, be renewed, extended, increased, amended, modified, accelerated, compromised, waived, surrendered or released by the Administrative Agent or any Lender, and the Credit Agreement and the other Loan Documents and any other documents executed and delivered in connection therewith may be amended, modified, supplemented or terminated, in whole or in part, as the Administrative Agent (or the Required Lenders or all Lenders, as the case may be) may deem reasonably advisable from time to time, and any collateral security, guarantee or right of offset at any time held by the Administrative Agent or any Lender for the payment of the Borrower Obligations may be sold, exchanged, waived, surrendered or released. Neither the Administrative Agent nor any Lender shall have any obligation to protect, secure, perfect or insure any Lien at any time held by it as security for the Borrower Obligations or for the guarantee contained in this Section 2 or any property subject thereto.

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2.5.      Guarantee Absolute and Unconditional . Each Guarantor waives any and all notice of the creation, renewal, extension or accrual of any of the Borrower Obligations and notice of or proof of reliance by the Administrative Agent or any Lender upon the guarantee contained in this Section 2 or acceptance of the guarantee contained in this Section 2; the Borrower Obligations, and any of them, shall conclusively be deemed to have been created, contracted or incurred, or renewed, extended, amended, increased or waived, in reliance upon the guarantee contained in this Section 2; and all dealings between the Borrower and any of the Guarantors, on the one hand, and the Administrative Agent and the Lenders, on the other hand, likewise shall be conclusively presumed to have been had or consummated in reliance upon the guarantee contained in this Section 2. Each Guarantor waives diligence, presentment, protest, demand for payment and notice of default or nonpayment to or upon the Borrower or any of the Guarantors with respect to the Borrower Obligations. Each Guarantor understands and agrees that the guarantee contained in this Section 2 shall be construed as a continuing, absolute and unconditional guarantee of payment without regard to (a) the validity or enforceability of the Credit Agreement or any other Loan Document, any of the Borrower Obligations or any other collateral security therefor or guarantee or right of offset with respect thereto at any time or from time to time held by the Administrative Agent or any Lender, (b) any defense, set-off or counterclaim (other than a defense of payment or performance) which may at any time be available to or be asserted by the Borrower or any other Person against the Administrative Agent or any Lender, or (c) any other circumstance whatsoever (with or without notice to or knowledge of the Borrower or such Guarantor) which constitutes, or might be construed to constitute, an equitable or legal discharge of the Borrower for the Borrower Obligations, or of such Guarantor under the guarantee contained in this Section 2, in bankruptcy or in any other instance. When making any demand hereunder or otherwise pursuing its rights and remedies hereunder against any Guarantor, the Administrative Agent or any Lender may, but shall be under no obligation to, make a similar demand on or otherwise pursue such rights and remedies as it may have against the Borrower, any other Guarantor or any other Person or against any collateral security or guarantee for the Borrower Obligations or any right of offset with respect thereto, and any failure by the Administrative Agent or any Lender to make any such demand, to pursue such other rights or remedies or to collect any payments from the Borrower, any other Guarantor or any other Person or to realize upon any such collateral security or guarantee or to exercise any such right of offset, or any release of the Borrower, any other Guarantor or any other Person or any such collateral security, guarantee or right of offset, shall not relieve any Guarantor of any obligation or liability hereunder, and shall not impair or affect the rights and remedies, whether express, implied or available as a matter of law, of the Administrative Agent or any Lender against any Guarantor. For the purposes hereof "demand" shall include the commencement and continuance of any legal proceedings.

2.6.      Reinstatement . The guarantee contained in this Section 2 shall continue to be effective, or be reinstated, as the case may be, if at any time payment, or any part thereof, of any of the Borrower Obligations is rescinded or must otherwise be restored or returned by the Administrative Agent or any Lender upon the insolvency, bankruptcy, dissolution, liquidation or reorganization of the Borrower or any Guarantor, or upon or as a result of the appointment of a receiver, intervenor or conservator of, or trustee or similar officer for, the Borrower or any Guarantor or any substantial part of its property, or otherwise, all as though such payments had not been made.

2.7.      Payments . Each Guarantor hereby guarantees that payments hereunder will be paid to the Administrative Agent without set-off or counterclaim in Dollars at the Funding Office.

SECTION 3. GRANT OF SECURITY INTEREST

Each Grantor hereby assigns and transfers to the Administrative Agent, and hereby grants to the Administrative Agent, for the ratable benefit of the Lenders, (and in the case of Specified Swap Agreements, Affiliates of Lenders), a security interest in, all of the following property now owned or at

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any time hereafter acquired by such Grantor or in which such Grantor now has or at any time in the future may acquire any right, title or interest (collectively, the " Collateral "), as collateral security for the prompt and complete payment and performance when due (whether at the stated maturity, by acceleration or otherwise) of such Grantor’s Obligations:

(a)       all Accounts;

(b)       all Chattel Paper;

(c)       all Commercial Tort Claims notified in accordance with Section 5.7;

(d)       all Documents (other than Title Documents with respect to Vehicles);

(e)       all Equipment;

(f)        all Fixtures;

(g)       all General Intangibles;

(h)       all Instruments;

(i)        all Intellectual Property;

(j)        all Inventory;

(k)       all Investment Property;

(l)        all Letter-of-Credit Rights;

(m)      all Deposit Accounts (other than payroll accounts);

(n)       all other property not otherwise described above (except for any property specifically excluded from any clause in this section above, any property specifically excluded from any defined term used in any clause of this section above or any property otherwise specifically excluded pursuant to any other provision of this Agreement or the other Loan Documents);

(o)       all books and records pertaining to the Collateral; and

(p)       to the extent not otherwise included, all Proceeds, Supporting Obligations and products of any and all of the foregoing and all collateral security and guarantees given by any Person with respect to any of the foregoing;

provided , however , that notwithstanding any of the other provisions set forth in this Section 3, this Agreement shall not constitute a grant of a security interest in (i) any property to the extent that such grant of a security interest is prohibited by any Requirements of Law of a Governmental Authority, requires a consent not obtained (after the commercially reasonable efforts of the relevant Grantor) of any Governmental Authority pursuant to such Requirement of Law or is prohibited by, or constitutes a breach or default under or results in the termination of or requires any consent not obtained (after the commercially reasonable efforts of the relevant Grantor) under, any contract, license, agreement, instrument or other document evidencing or giving rise to such property or, in the case of any Investment Property or Pledged Note, any applicable shareholder or similar agreement, except to the extent that such Requirement of Law or the term in such contract, license, agreement, instrument or other document or

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shareholder or similar agreement providing for such prohibition, breach, default or termination or requiring such consent is ineffective under applicable law or (ii) Collateral owned by any Grantor on the date hereof or hereafter acquired that is subject to a Lien securing a purchase money obligation or Capital Lease Obligation permitted to be incurred pursuant to the Credit Agreement if the contract or other agreement in which such Lien is granted (or the documentation providing for such purchase money obligation or Capital Lease Obligation) validly prohibits the creation of any other Lien on such Collateral; and provided , further , that notwithstanding anything in this Agreement to the contrary, in no event shall the Collateral include any Shared Collateral.

SECTION 4. REPRESENTATIONS AND WARRANTIES

To induce the Administrative Agent and the Lenders to enter into the Credit Agreement and to induce the Lenders to make their respective extensions of credit to the Borrower thereunder, each Grantor hereby represents and warrants to the Administrative Agent and each Lender that:

4.1.      Title; No Other Liens . Except for the security interest granted to the Administrative Agent for the ratable benefit of the Lenders, (and in the case of Specified Swap Agreements, Affiliates of Lenders), pursuant to this Agreement and the other Liens permitted to exist on the Collateral by the Credit Agreement, such Grantor owns each item of the Collateral free and clear of any and all Liens or claims of others. No Grantor has filed, consented to or authorized the filing of any financing statement or other public notice with respect to all or any part of the Collateral in any public office, except such as have been filed in favor of the Administrative Agent, for the ratable benefit of the Lenders, (and in the case of Specified Swap Agreements, Affiliates of Lenders), pursuant to this Agreement or as are permitted by the Credit Agreement. For the avoidance of doubt, it is understood and agreed that any Grantor may, as part of its business, grant licenses to third parties to use Intellectual Property owned or developed by a Grantor. For purposes of this Agreement and the other Loan Documents, such licensing activity shall not constitute a "Lien" on such Intellectual Property. Each of the Administrative Agent and each Lender understands that any such licenses may be exclusive to the applicable licensees, and such exclusivity provisions may limit the ability of the Administrative Agent to utilize, sell, lease or transfer the related Intellectual Property or otherwise realize value from such Intellectual Property pursuant hereto.

4.2.      Perfected First Priority Liens . When financing statements and the other filings specified on Schedule 3 in appropriate form are filed in the offices specified in Schedule 3 and Pledged Notes have been delivered to the Administrative Agent, as required (assuming continued possession by the Administrative Agent of such certificates and that such certificates are located in the United States), this Agreement will be effective to create, in favor of the Administrative Agent, for the ratable benefit of the Lenders, (and in the case of Specified Swap Agreements, Affiliates of Lenders), a valid and perfected security interest under the New York UCC in all of the respective right, title and interest of each Grantor in, to and under the Collateral, as collateral security for payment of the Obligations to the extent perfection can be achieved by filing Uniform Commercial Code financing statements and delivering Pledged Notes and such security interest will be prior to all other Liens on the Collateral in existence on the date hereof except for Liens permitted by the Credit Agreement.

4.3.      Jurisdiction of Organization; Chief Executive Office . On the date hereof, such Grantor’s jurisdiction of organization, identification number from the jurisdiction of organization (if any), and the location of such Grantor’s chief e