Document:

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                                                                   Exhibit 10.15

                                                                  EXECUTION COPY
                         CONSENT AND FIRST AMENDMENT TO
             SECOND AMENDED AND RESTATED LOAN AND SECURITY AGREEMENT

           This CONSENT AND FIRST AMENDMENT TO SECOND AMENDED AND RESTATED LOAN
AND SECURITY AGREEMENT (this "Agreement") is dated as of August 6, 2004, and is
entered into by and among BEACON ROOFING SUPPLY CANADA COMPANY ("Borrower") and
GE CANADA FINANCE HOLDING COMPANY, for itself as a Lender and as Agent.

           WHEREAS, Agent, Lenders and Borrower are parties to a certain Second
Amended and Restated Loan and Security Agreement dated as of March 12, 2004 (as
such agreement has been or may hereafter be from time to time further amended,
restated, supplemented or otherwise modified, the "Loan Agreement"); and

           WHEREAS, Beacon Roofing Supply, Inc. ("Holdings") has begun the steps
necessary to consummate an initial public offering of its common stock, the
proceeds of which shall be used to (i) redeem all of the Senior Subordinated
Notes, the Best Seller Notes and the Investor Seller Notes, (ii) redeem warrants
covering 2,839,937 shares of Holdings' common stock (after giving effect to a
4,550 to 1 stock split anticipated to occur prior to such initial public
offering) and (iii) repay a portion of the outstanding US Facility Revolving
Loans;

           WHEREAS, Borrower and the other Loan Parties have requested that
Agent and Lenders consent to the proposed initial public offering of Holdings'
common stock and use of proceeds thereof as described herein;

           WHEREAS, the parties also desire to amend the Loan Agreement as
hereinafter set forth;

           NOW THEREFORE, in consideration of the mutual conditions and
agreements set forth in the Loan Agreement and this Agreement, and other good
and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto hereby agree as follows:

           1.   DEFINITIONS. Capitalized terms used in this Agreement, unless
otherwise defined herein, shall have the meaning ascribed to such terms in the
Loan Agreement.

           2.   CONSENTS. Subject to the terms and conditions set forth below,
Agent and Lenders hereby consent to:

           (a)  the closing of an initial public offering of Holdings' common
stock for cash proceeds (net of underwriting discounts and commissions and other
costs associated therewith) ("Net Issuance Proceeds") to Holdings of not less
than US$75,000,000 (the "IPO"); and

           (b)  the application of the Net Issuance Proceeds of the IPO in the
following manner:

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                   (i)    to redeem all outstanding Senior Subordinated Notes,
     Best Seller Notes and Investor Subordinated Notes at par, plus accrued and
     unpaid interest thereon;

                   (ii)   to redeem warrants covering 2,839,937 shares of
     Holdings' common stock (after giving effect to a 4,550 to 1 stock split
     anticipated to occur before the IPO) at a price per share equal to 93% of
     the per share price to the public in the IPO; and

                   (iii)  to repay a portion of the outstanding US Facility
     Revolving Loans in an amount equal to the greater of (1) US$500,000 and (2)
     the balance of the Net Issuance Proceeds of the IPO remaining after payment
     of the amounts referred to in clauses (i) and (ii) above.

           3.   AMENDMENTS TO LOAN AGREEMENT.

     3.1   The first sentence of SUBSECTION 2.6 of the Loan Agreement is hereby
amended to read as follows:

           This Agreement shall be effective until the earliest of (a) September
     30, 2009, (b) the acceleration of all Obligations pursuant to SUBSECTION
     8.3 and (c) the date of termination of US Facility Lenders' obligations to
     make the US Facility Revolving Loans or permit existing US Facility
     Revolving Loans to remain outstanding (the "Termination Date").

     3.2   SUBSECTION 4.25 of the Loan Agreement is hereby amended to read as
follows:

           4.25    COLLECTION OF ACCOUNTS AND PAYMENTS. As promptly as
     practicable and in any event within 60 days following the First Amendment
     Date, Borrower shall establish lockboxes and blocked accounts
     (collectively, "Blocked Accounts") in its name with such banks ("Collecting
     Banks") as are acceptable to Agent (subject to irrevocable instructions
     acceptable to Agent as hereinafter set forth) to which all account debtors
     of Borrower shall directly remit all payments on Accounts of Borrower and
     in which Borrower will immediately deposit all payments made for Inventory
     or other payments constituting proceeds of Borrower Collateral in the
     identical form in which such payment was made, whether by cash or cheque.
     The Collecting Banks shall acknowledge and agree, in a manner satisfactory
     to Agent, that the Collecting Banks have no right to setoff against the
     Blocked Accounts at any time. The Collecting Banks shall further
     acknowledge and agree, in a manner satisfactory to Agent, that during the
     Activation Period: (i) all payments made to the Blocked Accounts are the
     sole and exclusive property of Agent and US Facility Agent for their
     benefit and for the benefit of Lenders and US Facility Lenders and (ii) all
     such payments received will be promptly transferred to Agent's Account.
     Borrower hereby agrees that (i) Agent and US Facility Agent, for their
     benefit and for the benefit of Lenders and US Facility Lenders, have been
     granted a Lien on such Blocked Accounts and all funds on deposit therein as
     additional collateral security for the

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     Obligations and the indebtedness and obligations under the US Facility Loan
     Agreement and (ii) during the Activation Period, all payments made to such
     Blocked Accounts or otherwise received by Agent and whether on the Accounts
     or as proceeds of other Borrower Collateral or otherwise will be the sole
     and exclusive property of Agent and US Facility Agent, for their benefit
     and for the benefit of Lenders and US Facility Lenders. Borrower shall
     irrevocably instruct each Collecting Bank to promptly transfer, during the
     Activation Period, all payments or deposits to the Blocked Accounts into
     Agent's Account. If Borrower, or any of its Affiliates, employees, agents
     or other Person acting for or in concert with Borrower, shall during the
     Activation Period receive any monies, cheques, notes, drafts or any other
     payments relating to and/or proceeds of Accounts of Borrower or other
     Borrower Collateral, Borrower shall cause such Person to hold such
     instrument or funds in trust for Agent, and, immediately upon receipt
     thereof, shall remit the same or cause the same to be remitted, in kind, to
     the Blocked Accounts or to Agent at its address set forth in SUBSECTION
     10.3 below. Notwithstanding any provision to the contrary herein or in any
     other Loan Document, prior to the Activation Period: (i) Borrower shall
     have sole dominion and control over the funds in the Blocked Accounts and
     the Collecting Banks shall transfer or apply funds on deposit therein in
     accordance with the instructions of Borrower, (ii) Borrower shall have no
     obligation to apply the funds in the Blocked Accounts to reduce any
     Obligations, and the Lenders and US Facility Lenders shall not have any
     right to cause such funds to be so applied, and (iii) neither the Agent nor
     the US Facility Agent shall have any right to endorse or collect any
     payments made to the Blocked Accounts, or to withdraw any funds from the
     Blocked Accounts, or to direct how the funds in the Blocked Accounts are
     applied. An Activation Notice shall not be given unless and until either
     (i) an Event of Default occurs or (ii) Excess Availability is less than
     US$10,000,000 and, in the case of this clause (ii), Requisite Lenders have
     directed that such Activation Notice be given or have consented thereto.

     3.3   SUBSECTION 7.1 of the Loan Agreement is hereby amended to read as
follows:

           SUBSECTION 7.1 INDEBTEDNESS AND LIABILITIES. Directly or indirectly
     create, incur, assume, guarantee, or otherwise become or remain directly or
     indirectly liable, on a fixed or contingent basis, with respect to any
     Indebtedness except:

           (a)  the Obligations;

           (b)  intercompany Indebtedness (i) outstanding on the Closing Date
     and (ii) arising from loans made by US Borrower to its Subsidiaries
     following the Closing Date to fund working capital requirements of such
     Subsidiaries in the ordinary course of business and to fund Permitted
     Acquisitions; PROVIDED, HOWEVER, that the aggregate outstanding principal
     amount of intercompany loans from US Borrower to Beacon Canada Holdings and
     Borrower shall not exceed an amount equal to the outstanding balance of
     such intercompany loan as of the Closing Date (after giving effect to the
     Related Transactions on the Closing Date) plus US$3,000,000 or the
     Equivalent Amount thereof in Canadian Dollars at any

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     time; PROVIDED, FURTHER, that upon the request of Agent at any time, such
     Indebtedness shall be evidenced by promissory notes having terms reasonably
     satisfactory to Agent, the sole originally executed counterparts of which
     shall be delivered to US Facility Agent and shall be pledged to (i) US
     Facility Agent, for the benefit of US Facility Agent and US Facility
     Lenders, as security for the obligations under the US Facility Loan
     Documents and (ii) Agent, for the benefit of Agent and Lenders, as security
     for the payee Loan Party's Obligations;

           (c)  [Intentionally Omitted];

           (d)  [Intentionally Omitted];

           (e)  [Intentionally Omitted];

           (f)  [Intentionally Omitted];

           (g)  [Intentionally Omitted];

           (h)  [Intentionally Omitted];

           (i)  [Intentionally Omitted];

           (j)  Indebtedness of US Borrower pursuant to the US Facility Loan
     Documents;

           (k)  in the case of the Loan Parties, other than Borrower and its
     Subsidiaries, Indebtedness permitted under the US Facility Loan Agreement;

           (l)  Indebtedness not to exceed US$12,000,000, or the Equivalent
     Amount thereof in Canadian Dollars, in the aggregate for all Loan Parties
     at any time outstanding secured by purchase money Liens or incurred with
     respect to Capital Leases;

           (m)  unsecured, subordinated Indebtedness evidenced by the
     Stockholder Notes;

           (n)  unsecured Indebtedness not to exceed US$10,000,000, or the
     Equivalent Amount thereof in Canadian Dollars, in the aggregate for all
     Loan Parties at any time outstanding which is subordinated to the
     Obligations in a manner satisfactory to Agent and Requisite Lenders;

           (o)  Indebtedness existing on the Closing Date and identified on
     SCHEDULE 7.1; and

           (p)  unsecured Indebtedness of Holdings incurred in connection with
     any Permitted Acquisition; provided, however, that any such Indebtedness
     shall (i) have a maturity date no earlier than ninety (90) days after the
     date set forth in CLAUSE (a) of the definition of "Termination Date", (ii)
     shall be fully subordinated

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     to the Obligations in a manner satisfactory to Agent and (iii) be otherwise
     issued pursuant to terms and conditions reasonably satisfactory to Agent.

           Loan Parties will not, and will not permit the other Loan Parties to,
     incur any Liabilities except for Indebtedness permitted herein and trade
     payables and normal accruals in the ordinary course of business not yet due
     and payable or with respect to which any Loan Party is contesting in good
     faith the amount or validity thereof by appropriate proceedings and then
     only to the extent that such Loan Party has established adequate reserves
     therefor under US GAAP.

     3.4   SUBSECTION 7.5 of the Loan Agreement is hereby amended to read as
follows:

           7.5  RESTRICTED JUNIOR PAYMENTS. Directly or indirectly declare,
     order, pay, make or set apart any sum for any Restricted Junior Payment,
     except that:

           (a)  Borrower may make payments and distributions to Beacon Canada
     Holdings that are used by Beacon Canada Holdings to make payments and
     distributions to US Borrower, the proceeds of which payments and
     distributions US Borrower uses to make payments and distributions to
     Holdings in order that Holdings may pay US federal and state income taxes
     then due and owing, franchise taxes and other similar licensing expenses
     incurred in the ordinary course of business; provided that Borrower's
     aggregate contribution to taxes as a result of the filing of a consolidated
     or combined return by Holdings shall not be greater, nor the aggregate
     receipt of tax benefits less, than they would have been had Borrower and
     its Subsidiaries not filed a consolidated or combined return with Holdings;

           (b)  Subsidiaries of Borrower may make Restricted Junior Payments to
     Borrower;

           (c)  [Intentionally Omitted];

           (d)  [Intentionally Omitted];

           (e)  [Intentionally Omitted];

           (f)  US Borrower may make distributions to Holdings to permit
     Holdings to redeem (and Holdings may redeem) shares of its capital stock
     (or warrants or options to acquire any such shares) from employees of US
     Borrower and its Subsidiaries upon the death or other termination of
     employment of such employees, or to permit Holdings to pay interest or
     principal in respect of any Stockholder Notes issued by Holdings to any
     such employees or their executors or administrators in payment of all or
     any portion of such redemption price, provided all of the following
     conditions are satisfied:

                (i)   no Default or Event of Default shall have occurred and be
           continuing or would arise as a result of such distribution or
           redemption;

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                (ii)  after giving effect to such distribution and redemption,
           the Loan Parties shall be in compliance on a pro forma basis with all
           covenants and agreements set forth in the Financial Covenants Rider
           (excluding PARAGRAPH A thereof) recomputed for the twelve-month
           period ending on the last day of the most recent fiscal quarter for
           which Agent has received the monthly financial statements required to
           be delivered pursuant to paragraph (A) of the Reporting Rider;

                (iii) the aggregate amount of such distributions permitted in
           any fiscal year of US Borrower shall not exceed US$500,000; and

                (iv)  after giving effect to such distribution and payment and
           the making of any US Facility Revolving Loan to fund such
           distribution, Excess Availability is at least US$7,500,000;

           (g)  [Intentionally Omitted];

           (h)  [Intentionally Omitted];

           (i)  [Intentionally Omitted);

           (j)  [Intentionally Omitted];

           (k)  The Loan Parties may pay to CHS the management fees set forth on
     Schedule 7.8 to the extent accrued prior to the closing of the IPO and
     permitted under SUBSECTION 7.8; and

           (l)  Subsidiaries of the US Borrower, other than Borrower and its
     Subsidiaries, may make Restricted Junior Payments permitted under the US
     Facility Loan Agreement.

     3.5   CLAUSE (d) of SUBSECTION 7.8 of the Loan Agreement is hereby amended
to read as follows:

           (d)  for payment of reasonable fees to independent directors.

     3.6   SUBSECTION 7.11 of the Loan Agreement is hereby amended to read as
follows:

           7.11  SUBSIDIARIES. Other than the Subsidiaries set forth on SCHEDULE
     7.11, establish, create or acquire any new Subsidiaries other than in
     connection with a Permitted Acquisition.

     3.7   The first sentence of SUBSECTION 7.13 of the Credit Agreement is
hereby amended to read as follows:

           Borrower agrees that none of it, the other Loan Parties or any of
     their respective Affiliates will in the future issue any press releases or
     other public disclosure, including any prospectus, proxy statement or other
     materials filed with

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     any Governmental Authority relating to a public offering of the Stock of
     any Loan Party or any of its Subsidiaries, using the name of GE Canada
     Finance or GE Capital or any of their respective Affiliates or specifically
     referring to this Agreement, the other Loan Documents or the Related
     Transactions Documents without at least two (2) Business Days' prior notice
     to GE Canada Finance and GE Capital and without the prior written consent
     of GE Canada Finance and GE Capital except that, to the extent (and only to
     the extent) such disclosure is required under applicable law or under the
     applicable rules of any national securities exchange, national securities
     association, national market system or similar provincial self-regulatory
     organization or any other self-regulatory organization, the Loan Parties
     may make such disclosure without the consent of GE Capital and GE Canada
     Finance, and except in the case of any material disclosure, without giving
     prior notice to GE Capital and GE Canada Finance, provided that the Loan
     Parties must in all events use reasonable efforts to consult with GE
     Capital and GE Canada Finance before making such disclosure.

     3.8   SUBSECTION 8.1(F) of the Loan Agreement is hereby amended to read as
follows:

           (F)  CHANGE IN CONTROL. (1) Any person or group of persons
     (within the meaning of the Securities Exchange Act of 1934) other than the
     underwriters in a public offering or CHS shall acquire beneficial ownership
     (within the meaning of Rule 13d-3 promulgated by the Securities and
     Exchange Commission under the Securities Exchange Act of 1934) of 25% or
     more of the issued and outstanding shares of capital stock of Holdings
     having the right to vote for the election of directors of Holdings under
     ordinary circumstances; or (2) Holdings ceases to beneficially and of
     record own and control all of the issued and outstanding capital stock or
     other equity securities of US Borrower free and clear of all Liens other
     than Liens in favour of Agent and US Facility Agent; or (3) US Borrower
     ceases to beneficially own and control, directly or indirectly, free and
     clear of all Liens other than Liens in favour of Agent and US Facility
     Agent, 100% of the issued and outstanding shares of each class of capital
     stock or other equity securities entitled (without regard to the occurrence
     of any contingency) to vote for the election of a majority of the members
     of the boards of directors of any Loan Party other than US Borrower and
     Holdings; or

     3.9   SECTION 11 of the Loan Agreement is hereby amended by inserting the
following new definitions in their proper alphabetical order:

           "ACTIVATION NOTICE" means written notice from Agent or US Facility
     Agent instructing the Collecting Bank to transfer funds in such Blocked
     Account to Agent or US Facility Agent or as otherwise instructed by Agent
     or US Facility Agent.

           "ACTIVATION PERIOD" means, with respect to a Blocked Account at a
     Collecting Bank, the period which commences as soon as possible but in any
     event within a reasonable period of time (not to exceed two Business Days)
     after

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     such Collecting Bank's receipt of an Activation Notice with respect to such
     Blocked Account.

           "FIRST AMENDMENT" means the Consent and First Amendment to Second
     Amended and Restated Loan and Security Agreement dated as of the First
     Amendment Date by and among Borrower, Agent and Lenders.

           "FIRST AMENDMENT DATE" means August 6, 2004.

           "PRO FORMA EBITDA" has the meaning assigned to it in the US Facility
     Loan Agreement.

           "TOTAL INDEBTEDNESS" means the aggregate outstanding principal
     balance of all Indebtedness of Holdings and its Subsidiaries on a
     consolidated basis.

     3.10  The definitions of "EBITDA" and "Equity Documents" set forth in
SUBSECTION 11.1 of the Loan Agreement are hereby amended to read as follows:

           "EBITDA" means, for any period, without duplication, the total of the
     following for Holdings and its Subsidiaries on a consolidated basis, each
     calculated for such period: (1) net income determined in accordance with US
     GAAP; PLUS, to the extent included in the calculation of net income, (2)
     the sum of (a) income, capital and franchise taxes paid or accrued; (b)
     interest expenses, net of interest income, paid or accrued; (c)
     amortization and depreciation, (d) other non-cash charges (excluding
     accruals for cash expenses made in the ordinary course of business) and (e)
     out-of-pocket expenses incurred in connection with the consummation of the
     IPO (as such term is defined in the First Amendment), including without
     limitation the amendment fee required to be paid by US Borrower pursuant to
     Section 4.6 of the First Amendment; LESS, to the extent included in the
     calculation of net income, (3) the sum of (a) the income of any Person
     (other than US Borrower and wholly-owned Subsidiaries of US Borrower) in
     which Holdings or a wholly-owned Subsidiary of Holdings has an ownership
     interest except to the extent such income is received by US Borrower or a
     wholly-owned Subsidiary of US Borrower in a cash distribution during such
     period; (b) gains or losses from sales or other dispositions of assets
     (other than Inventory in the normal course of business); and (c)
     extraordinary or non-recurring gains, but not net of extraordinary or
     non-recurring "cash" losses.

           "Equity Documents" means (i) the Chief Executive Securities Agreement
     dated as of August 21, 1997 by and among Holdings, CHS and Andrew Logie and
     (ii) the Executive Securities Agreements among Holdings, CHS and certain
     managers of the Loan Parties.

     3.11  EXHIBIT C (COMPLIANCE CERTIFICATE) to the Loan Agreement is hereby
replaced with EXHIBIT C attached hereto.

     3.12  The Reporting Rider to the Loan Agreement is hereby amended by
inserting the following as PARAGRAPH M thereto:

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           (M)  SEC FILINGS AND PRESS RELEASES. Promptly upon their becoming
     available, Borrower will deliver to Agent copies of (1) all financial
     statements, reports, notices and proxy statements sent or made available by
     Holdings to its stockholders, (2) all regular and periodic reports and all
     registration statements and prospectuses, if any, filed by Holdings with
     any securities exchange or with the Securities and Exchange Commission or
     any private regulatory authority, and (3) all press releases and other
     statements made available by Holdings to the public concerning developments
     in the business of any Loan Party.

     3.13  PARAGRAPH G of the Reporting Rider is hereby amended to read as
follows:

           (G)  [Intentionally Omitted.]

     3.14  The Financial Covenants Rider to the Loan Agreement is hereby
replaced with the Financial Covenant to Rider attached hereto.

           4.   CONDITIONS. The effectiveness of this Agreement is subject to
the following conditions precedent (unless specifically waived in writing by
Agent and Lenders):

     4.1   Borrower, Agent and Lenders shall have executed and delivered this
Agreement.

     4.2   Holdings shall have completed the IPO and the Net Issuance Proceeds
thereof shall have been applied in accordance with SECTION 2 of this Agreement
and, in each case, Agent shall have been provided with satisfactory evidence
thereof.

     4.3   Agent shall have received a written opinion of Blake Cassels &
Graydon LLP, Canadian counsel for Borrower and the Loan Parties, in form and
substance reasonably satisfactory to Agent and its counsel.

     4.4   Borrower shall have delivered such other documents as Agent may have
reasonably requested.

     4.5   All proceedings taken in connection with the transactions
contemplated by this Agreement and all documents, instruments and other legal
matters incident thereto shall be satisfactory to Agent and Lenders and their
respective legal counsel

     4.6   US Borrower shall have paid to US Facility Agent, for the ratable
benefit of US Facility Lenders, Agent and Lenders, an amendment fee in the
amount of US$237,750.

     4.7   No Default or Event of Default shall have occurred and be continuing.

     4.8   US Borrower, the other Loan Parties, US Facility Agent and US
Facility Lenders shall have entered into an amendment to the US Facility Loan
Agreement in form and substance satisfactory to Agent, all of the conditions
precedent to the effectiveness of such amendment shall have been satisfied.

     4.9   US Borrower and each other Loan Party shall have executed the Consent
and Reaffirmation (Loan Parties) attached to this Agreement.

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           This Agreement shall be terminated and of no further force or effect
(i) if the IPO shall not have closed on or prior to October 15, 2004 or (ii) at
the election of the Requisite Lenders, if an Event of Default shall occur and be
continuing prior to the closing of the IPO.

           5.   REPRESENTATIONS AND WARRANTIES. To induce Agent and Lenders to
enter into this Agreement, Borrower represents and warrants to Agent and
Lenders:

           (a)  that Borrower has all requisite organizational power and
authority to enter into, and carry out the transactions contemplated by, this
Agreement and all other agreement and documents executed in connection therewith
to which Borrower is party;

           (b)  that the execution, delivery and performance of this Agreement
and all other agreements and documents executed in connection therewith have
been duly authorized by all requisite action on the part of Borrower and that
this Agreement has been duly executed and delivered by Borrower;

           (c)  that each of the representations and warranties set forth in
SECTION 4 of the Loan Agreement (other than those which, by their terms,
specifically are made as of certain date prior to the date hereof) are true and
correct in all material respects as of the date hereof; and

           (d)  that, after giving effect to this Agreement, no Default or Event
of Default has occurred and is continuing.

           6.   SEVERABILITY. Any provision of this Agreement held by a court of
competent jurisdiction to be invalid or unenforceable shall not impair or
invalidate the remainder of this Agreement and the effect thereof shall be
confined to the provision so held to be invalid or unenforceable.

           7.   COUNTERPARTS. This Agreement may be executed in one or more
counterparts, each of which shall constitute an original, but all of which taken
together shall be one and the same instrument. Any party may deliver an executed
copy of this Agreement by fax but that party shall immediately deliver to the
other parties an originally executed copy of this Agreement.

           8.   RATIFICATION. Except as expressly set forth herein, the terms
and provisions set forth in this Agreement shall not be deemed to be a
modification or waiver of any term or condition of the Loan Agreement. The terms
and provisions of the Loan Agreement, as amended hereby, and the other Loan
Documents are ratified and confirmed and shall continue in full force and effect
and all Collateral encumbered by any of the Loan Documents will continue to
secure, to the fullest extent possible, the payment and performance of all
Obligations under or in respect of the Loan Agreement or any of the other Loan
Documents.

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           IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
be duly executed under seal and delivered by their respective duly authorized
officers on the date first written above.

                                           BEACON ROOFING SUPPLY CANADA
                                           COMPANY

                                           By:    /s/ Peter M. Gotsch
                                              --------------------------
                                           Title: Vice President
                                                 -----------------------

                                                               CONSENT AND FIRST
                                                                       AMENDMENT

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                                GE CANADA FINANCE HOLDING
                                COMPANY, as Agent and as Lender

                                By: /s/ Stephen B. Smith
                                   ---------------------------------------
                                Its Authorized
                                Signatory:     STEPHEN B. SMITH
                                          --------------------------------
                                                        President
                                            GE Canada Finance Holding Company

                                                               CONSENT AND FIRST
                                                                       AMENDMENT

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                    CONSENT AND REAFFIRMATION (LOAN PARTIES)

           Each of the undersigned Loan Parties hereby (i) acknowledges receipt
of a copy of the foregoing Consent and First Amendment to Loan and Security
Agreement; (ii) consents to Borrower's execution and delivery thereof; and (iii)
affirms that nothing contained therein shall modify in any respect whatsoever
its guaranty of the obligations of Borrower to Agent and Lenders pursuant to the
terms of the Existing Guaranty to which such Loan Party is a party and reaffirms
that such Existing Guaranty is and shall continue to remain in full force and
effect and that each other Loan Document to which such Loan Party is a party or
otherwise bound and all Collateral encumbered thereby will continue to guaranty
or secure, as the case may be, to the fullest extent possible, the payment and
performance of all obligations under or in respect of such Existing Guaranty and
such other Loan Documents.

           For purposes of this Consent and Reaffirmation (Loan Parties): (A)
the term "EXISTING GUARANTIES" means (i) the Guaranty dated as of June 8, 2001
given by Holdings for the benefit of Agent in its capacity as Agent for the
Lenders, (ii) the Guaranty dated as of June 8, 2001 given by US Facility
Borrower for the benefit of Agent in its capacity as Agent for the Lenders and
(iii) the Subsidiary Guaranty dated as of June 8, 2001 given by Quality Roofing
Supply Company, Inc., Beacon Canada, Inc., Best Distributing Co., The Roof
Center, Inc. and West End Lumber Company Inc., for the benefit of Agent in its
capacity as Agent for the Lenders, in each case as reaffirmed and amended
pursuant to that certain Master Reaffirmation and Amendment to Collateral
Documents made as of March 12, 2004 by each of the undersigned Loan Parties in
favour of Agent and Lenders and (B) the term "EXISTING GUARANTY" means any of
the Existing Guaranties.

           Although each of the undersigned has been informed of the matters set
forth herein and has acknowledged and consented to same, each of the undersigned
understands that Agent and Lenders have no obligation to inform it of such
matters in the future or to seek its acknowledgment or consent to future
agreements or waivers, and nothing herein shall create such a duty.

                      [THIS SPACE INTENTIONALLY LEFT BLANK]

                                     - 13 -                    CONSENT AND FIRST
                                                                       AMENDMENT

<Page>

           IN WITNESS WHEREOF, each of the undersigned has executed this Consent
and Reaffirmation (Loan Parties) as of this 10th day of August, 2004.

                                           BEACON SALES ACQUISITION, INC.

                                           By:     /s/ Peter M. Gotsch
                                              -------------------------
                                           Title:  Vice President
                                                 ----------------------

                                           QUALITY ROOFING SUPPLY
                                           COMPANY, INC.

                                           By:     /s/ Peter M. Gotsch
                                              -------------------------
                                           Title:  Vice President
                                                 ----------------------

                                           BEACON CANADA, INC.

                                           By:     /s/ Peter M. Gotsch
                                              -------------------------
                                           Title:  Vice President
                                                 ----------------------

                                           BEST DISTRIBUTING CO.

                                           By:     /s/ Peter M. Gotsch
                                              -------------------------
                                           Title:  Vice President
                                                 ----------------------

                                           THE ROOF CENTER, INC.

                                           By:     /s/ Peter M. Gotsch
                                              -------------------------
                                           Title:  Vice President
                                                 ----------------------

                                           WEST END LUMBER COMPANY, INC.

                                           By:     /s/ Peter M. Gotsch
                                              -------------------------
                                           Title:  Vice President
                                                 ----------------------

                                           BEACON ROOFING SUPPLY, INC.

                                           By:     /s/ Peter M. Gotsch
                                              -------------------------
                                           Name:   Peter M. Gotsch
                                                 ----------------------
                                           Title:  Vice President

                                                               CONSENT AND FIRST
                                                                       AMENDMENT

<Page>

                            FINANCIAL COVENANTS RIDER

           This Financial Covenants Rider is attached and made a part of that
certain Second Amended and Restated Loan and Security Agreement, dated as of
March 12, 2004 and entered into among Beacon Roofing Supply Canada Company,
Agent and Lenders.

           A. EXCESS AVAILABILITY. Excess Availability shall be maintained at
all times in an amount of at least US$5,000,000.

           B. CAPITAL EXPENDITURE LIMITS. The aggregate amount of all Capital
Expenditures of US Borrower and its Subsidiaries, Capital Leases with respect to
fixed assets of US Borrower and its Subsidiaries (which shall be considered to
be expended in full on the date such Capital Lease is entered into) and other
contracts with respect to fixed assets initially capitalized on US Borrower's or
any Subsidiary's balance sheet prepared in accordance with US GAAP (which shall
be considered to be expended in full on the date such contract is entered into)
(excluding, in each case, expenditures for trade-ins and replacement of assets
to the extent funded with casualty insurance proceeds and excluding the purchase
price allocated to fixed assets acquired in connection with a Permitted
Acquisition) will not exceed US$8,500,000 in any Fiscal Year. Fifty percent
(50%) of the amount set forth above not made in any Fiscal Year may be carried
over for one year only to the next Fiscal Year; PROVIDED, HOWEVER, any
carried-over amount will be deemed used only after all otherwise permitted
amounts for that Fiscal Year have been used.

           C. FIXED CHARGE COVERAGE. Fixed Charge Coverage for each twelve (12)
month period ending as of any date set forth below shall not be less than the
ratio set forth below for such date:

<Table>
<Caption>
                DATE                                       RATIO
                ----                                       -----
                <S>                                        <C>
                September 30, 2004 and the last            1.35
                day of each fiscal quarter thereafter
</Table>

           D. SENIOR INDEBTEDNESS TO EBITDA. The ratio of Senior Indebtedness
calculated as of any date set forth below to EBITDA for the twelve (12) month
period ending on such date shall not be greater than the ratio set forth below
for such date:

<Table>
<Caption>
                DATE                                       RATIO
                ----                                       -----
                <S>                                        <C>
                September 30, 2004 and the last            3.00
                day of each fiscal quarter thereafter
</Table>

The aggregate balances of the Revolving Loan and the US Facility Revolving Loans
included in Senior Indebtedness as of any date of determination shall be equal
to the average balance of the Revolving Loan and the US Facility Revolving
Loans, respectively, for such date and the last day of the two immediately
preceding months.

With respect to each Target acquired by US Borrower during any such twelve month
period, EBITDA shall be adjusted by an amount equal to the Pro Forma EBITDA of
such Target for the

                                                               CONSENT AND FIRST
                                                                       AMENDMENT

<Page>

                                                                  EXECUTION COPY

portion of such twelve (12) month period which precedes the acquisition of such
Target by US Borrower.

           E. TOTAL INDEBTEDNESS TO EBITDA. The ratio of Total Indebtedness
calculated as of any date set forth below to EBITDA for the twelve (12) month
period ending on such date shall not be greater than the ratio set forth below
for such date:

<Table>
<Caption>
                DATE                                       RATIO
                ----                                       -----
                <S>                                        <C>
                September 30, 2004 and the last            4.25
                day of each fiscal quarter thereafter
</Table>

The aggregate balance of the Revolving Loan and the US Facility Revolving Loans
included in Total Indebtedness as of any date of determination shall be equal to
the average balance of the Revolving Loan and the US Facility Revolving Loans,
respectively, for such date and the last day of the two immediately preceding
months.

With respect to each Target acquired by US Borrower during any such twelve month
period, EBITDA shall be adjusted by an amount equal to the Pro Forma EBITDA of
such Target for the portion of such twelve (12) month period which precedes the
acquisition of such Target by US Borrower.

           F. LEASE LIMITS. No Loan Party or any of its Subsidiaries will,
directly or indirectly, become or remain liable in any way, whether directly or
by assignment or as a guarantor or other surety, for the obligations of the
lessee under any operating lease, synthetic lease or similar off-balance sheet
financing, if the aggregate amount of all rents (or substantially equivalent
payments) paid by the Loan Parties and their Subsidiaries under all such leases
would exceed US$11,000,000, or the Equivalent Amount thereof, in any fiscal year
of Borrower.

                                                               CONSENT AND FIRST
                                                                       AMENDMENTQuickLinks
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Exhibit 4.3  

 
 

FIRST SUPPLEMENTAL INDENTURE    
    

        FIRST
SUPPLEMENTAL INDENTURE (this "Supplemental Indenture"), dated as of August 20, 2004, among Yona Venetian, LLC, a Delaware
limited liability company, and Interface Employee Leasing, LLC, a Nevada limited liability company (together, the "Guaranteeing Subsidiaries"), each, an
indirect wholly owned subsidiary of Las Vegas Sands, Inc., a Nevada corporation (the "Company"), the Company, Venetian Casino Resort, LLC
("Venetian" and, together with the Company, the "Issuers"), the other Note Guarantors (as defined in the
Indenture referred to below) and U.S. Bank National Association, as trustee under the Indenture referred to below (the "Trustee"). 

 
 

WITNESSETH    
    

        WHEREAS, the Company has heretofore executed and delivered to the Trustee an indenture (the "Indenture"), dated as
of June 4, 2002 providing for the issuance of 11.00% Mortgage Notes due 2010 (the "Notes"); 

        WHEREAS,
the Indenture provides that under certain circumstances the Guaranteeing Subsidiaries shall execute and deliver to the Trustee a supplemental indenture pursuant to which the
Guaranteeing Subsidiaries shall unconditionally guarantee all of the Issuers' Obligations under the Notes and the Indenture on the terms and conditions set forth herein (the
"Note Guarantee"); and 

        WHEREAS,
pursuant to Section 9.01 of the Indenture, the Trustee is authorized to execute and deliver this Supplemental Indenture. 

        NOW
THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the Guaranteeing Subsidiaries and the Trustee
mutually covenant and agree for the equal and ratable benefit of the Holders of the Notes as follows: 

        1.    Capitalized Terms.    Capitalized terms used herein without definition shall have the meanings assigned, to them
in the Indenture. 

        2.    Agreement to Guarantee.    Each Guaranteeing Subsidiary hereby agrees as follows: 

        (a)   Along
with all Note Guarantors named in the Indenture, to jointly and severally Guarantee to each Holder of a Note authenticated and delivered by the Trustee and to the
Trustee and its successors and assigns, the Notes or the obligations of the Issuers hereunder or thereunder, that: 

          (i)  the
principal of, and premium and Liquidated Damages, if any, and interest on the Notes will be promptly paid in full when due, whether at maturity, by acceleration,
redemption or otherwise, and interest on the overdue principal of and interest on the Notes, if any, if lawful, and all other obligations of the Issuers to the Holders or the Trustee hereunder or
thereunder will be promptly paid in full or performed, all in accordance with the terms hereof and thereof; and 

         (ii)  in
case of any extension of time of payment or renewal of any Notes or any of such other obligations, that same will be promptly paid in full when due or performed in
accordance with the terms of the extension or renewal, whether at stated maturity, by acceleration, prepayment, declaration, demand or otherwise. Failing payment when due of any amount so guaranteed
for whatever reason, the Note Guarantors shall be jointly and severally obligated to pay the same immediately. 

        (b)   The
obligations hereunder shall be unconditional, irrespective of the validity or enforceability of the Notes or the Indenture, the absence of any action to enforce the
same, any waiver or consent by any Holder of the Notes with respect to any provisions hereof or thereof, the 

 

recovery
of any judgment against the Issuers, any action to enforce the same or any other circumstance which might otherwise constitute a legal or equitable discharge or defense of a Note Guarantor. 

        (c)   The
following is hereby waived: diligence, presentment, demand of payment, filing of claims with a court in the event of insolvency or bankruptcy of the Issuers, any
right to require a proceeding first against the Issuers, protest, notice and all demands whatsoever. 

        (d)   This
Note Guarantee shall not be discharged except by complete performance of the obligations contained in the Notes and the Indenture, and the Guaranteeing Subsidiary
accepts all obligations of a Note Guarantor under the Indenture. 

        (e)   If
any Holder or the Trustee is required by any court or otherwise to return to either the Issuers, or any Note Guarantor, or any custodian, trustee or similar official
acting in relation to either of the Issuers or such Note Guarantor, any amount paid by either to the Trustee or such Holder, this Note Guarantee, to the extent theretofore discharged, shall be
reinstated in full force and effect. 

        (f)    The
Guaranteeing Subsidiary shall not be entitled to any right of subrogation in relation to the Holders in respect of any obligations guaranteed hereby until payment in
full of all obligations guaranteed hereby. 

        (g)   As
between the Note Guarantors, on the one hand, and the Holders and the Trustee, on the other hand, (x) the maturity of the obligations guaranteed hereby may be
accelerated as provided in Article 6 of the Indenture for the purposes of this Note Guarantee, notwithstanding any stay, injunction or other prohibition preventing such acceleration in respect
of the obligations guaranteed hereby, and (y) in the event of any declaration of acceleration of such obligations as provided in Article 6 of the Indenture, such obligations (whether or
not due and payable) shall forthwith become due and payable by the Note Guarantors for the purpose of this Note Guarantee. 

        (h)   The
Note Guarantors shall have the right to seek contribution from any non-paying Note Guarantor so long as the exercise of such right does not impair the
rights of the Holders under the Note Guarantee. 

        (i)    Pursuant
to Section 11.03 of the Indenture, after giving effect to any maximum amount and all other (contingent or otherwise) liabilities that are relevant under
any applicable Bankruptcy or fraudulent conveyance laws, and after giving effect to any collections from, rights to receive contribution from or payments made by or on behalf of any other Note
Guarantor in respect of the obligations of such other Note Guarantor under Article 11 of the Indenture, this new Note Guarantee shall be limited to the maximum amount permissible such that the
obligations of such Note Guarantor under this Note Guarantee will not constitute a fraudulent transfer or conveyance. 

        3.    Execution and Delivery.    Each Guaranteeing Subsidiary agrees that the Note Guarantees shall remain in full
force and effect notwithstanding any failure to endorse on each Note a notation of such Note Guarantee. 

        4.    Guaranteeing Subsidiaries May Consolidate, etc. on Certain Terms.    

        (a)   Except
in the event of a disposition of all or substantially all of the assets of a Note Guarantor by way of merger or consolidation or other merger or consolidation
permitted by this Indenture in which the Note Guarantor ceases to be a Restricted Subsidiary, no Note Guarantor shall consolidate with or merge with or into (whether or not such Note Guarantor is the
surviving Person), another Person whether or not affiliated with such Note Guarantor unless (i) subject to the provisions of the following paragraph and Section 11.05 of the Indenture,
the Person formed by or surviving any such consolidation or merger (if other than such Note Guarantor) assumes all 

2

 

the
obligations of such Note Guarantor pursuant to a supplemental indenture and supplemental Collateral Documents in a form reasonably satisfactory to the Trustee pursuant to which such Person shall
unconditionally guarantee all of such Note Guarantor's obligations under such Note Guarantee, this Indenture and the Collateral Documents on the terms set forth in this Indenture;
(ii) immediately after giving effect to such transaction, no Default or Event of Default exists; and (iii) such transaction will not result in the loss or suspension or material
impairment of any material Gaming License of the Issuers or any of their Restricted Subsidiaries. In case of any such consolidation, merger, sale or conveyance and upon the assumption by the successor
Person, by supplemental indenture, executed and delivered to the Trustee and reasonably satisfactory in form to the Trustee, of the Note Guarantee in this Indenture and the due and punctual
performance and observance of all of the covenants and conditions of this Indenture to be performed by the Note Guarantor, such successor Person shall succeed to and be substituted for the Note
Guarantor with the same effect as if it had been named herein as a Note Guarantor. 

        (b)   Notwithstanding
the foregoing, (A) a Note Guarantor may consolidate with or merge with or into, or sell or otherwise dispose of all or substantially all of its
assets to, the Issuers, provided, that the surviving corporation (if other than the Issuers) shall expressly assume by supplemental indenture complying
with the requirements of this Indenture, the due and punctual payment of the principal of, premium and Liquidated Damages, if any, and interest on all of the Notes, and the due and punctual
performance and observance of all the covenants and conditions of this Indenture to be performed by the Issuers and (B) a Note Guarantor may consolidate with or merge with or into, or sell or
otherwise dispose of all or substantially all of its assets to, any other Note Guarantor. 

        5.    Releases.    

        (a)   Upon
(i) a sale or other disposition of all or substantially all of the assets of any Note Guarantor, by way of merger, consolidation or otherwise, (ii) a
Note Guarantor becoming an Unrestricted Subsidiary pursuant to the terms of this Indenture, (iii) a sale or other disposition of all of the Capital Stock of any Note Guarantor that is a
Subsidiary or (iv) a sale of Capital Stock or other transaction which results in such Note Guarantor ceasing to be a Restricted Subsidiary, then, without any action required on the part of the
Trustee or any Holder of the Notes, such Note Guarantor (in the event of a sale or other disposition, by way of such a merger, consolidation or otherwise, of all or a portion of the Capital Stock of
such Note Guarantor or the Note Guarantor becoming an Unrestricted Subsidiary pursuant to the terms of this Indenture) or the person acquiring the property (in the event of a sale or other disposition
of all or substantially all of the assets of such Note Guarantor) shall be released and relieved of any obligations under its Note Guarantee without any action required on the part of the Trustee or
any Holder of the Notes; provided, that (i) immediately after giving effect to such transaction, no Default or Event of Default shall have
occurred and be continuing or would occur as a consequence thereof and (ii) if applicable, the Net Proceeds of such sale or other disposition are applied in accordance with Section 4.10
of the Indenture and the Collateral Documents. 

        (b)   If
any Note Guarantor is released from its Guarantee to the lenders under any First Lien Credit Facility, such Note Guarantor shall be released from its obligations
under the Note Guarantee without any action required on the part of the Trustee or any Holder of Notes. A Note Guarantor may also be released from its obligations under its Note Guarantee pursuant to
the Articles 8, 9 or 12 of the Indenture. 

        6.    No Recourse Against Others.    No past, present or future director, officer, employee, incorporator, member,
partner or stockholder of the Guaranteeing Subsidiaries, as such, shall have any liability for any obligations of the Issuers or any Guaranteeing Subsidiary under the Notes, any Note Guarantees, the
Indenture or this Supplemental Indenture or for any claim based on, in respect of, or 

3

 

by
reason of, such obligations or their creation. Each Holder of the Notes by accepting a Note waives and releases all such liability. The waiver and release are part of the consideration for issuance
of the Notes. 

        7.    NEW YORK LAW TO GOVERN.    THE INTERNAL LAW OF THE STATE OF NEW YORK SHALL GOVERN AND BE USED TO CONSTRUE THIS
SUPPLEMENTAL INDENTURE BUT WITHOUT GIVING EFFECT TO APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT THAT THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION WOULD BE REQUIRED THEREBY. 

        8.    Counterparts.    The parties may sign any number of copies of this Supplemental Indenture. Each signed copy
shall be an original, but all of them together represent the same agreement. 

        9.    Effect of Headings.    The Section headings herein are for convenience only and shall not affect the
construction hereof. 

        10.    The Trustee.    The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity
or sufficiency of this Supplemental Indenture or for or in respect of the recitals contained herein, all of which recitals are made solely by the Guaranteeing Subsidiaries and the Issuers. 

        IN
WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed and attested, all as of the date first above written. 

	Dated: August 20, 2004	 	 	 
	

 	
 	

YONA VENETIAN, LLC
	

 	
 	

By:	

Las Vegas Sands, Inc., its member
	

 	
 	

By:	

/s/  ROBERT G. GOLDSTEIN      
 Name: Robert G. Goldstein

Title: Senior Vice President
	

 	
 	

INTERFACE EMPLOYEE LEASING, LLC
	

 	
 	

By:	

Las Vegas Sands, Inc., its member
	

 	
 	

By:	

/s/  ROBERT G. GOLDSTEIN      
 Name: Robert G. Goldstein

Title: Senior Vice President
	 	 	 	 

4

 

	

 	
 	

U.S. BANK NATIONAL ASSOCIATION,

as Trustee
	

 	
 	

By:	

/s/  RICHARD PROKOSCH      
 Name: Richard Prokosch

Title: Vice President
	

 	
 	

ACKNOWLEDGED AND AGREED:
	

 	
 	

LAS VEGAS SANDS, INC.
	

 	
 	

By:	

/s/  ROBERT G. GOLDSTEIN      
 Name: Robert G. Goldstein

Title: Senior Vice President
	

 	
 	

VENETIAN CASINO RESORT, LLC
	

 	
 	

By:	

Las Vegas Sands, Inc., its

managing member
	

 	
 	

By:	

/s/  ROBERT G. GOLDSTEIN      
 Name: Robert G. Goldstein

Title: Senior Vice President
	

 	
 	

MALL INTERMEDIATE HOLDING COMPANY, LLC
	

 	
 	

By:	

Venetian Casino Resort, LLC, its member
	

 	
 	

By:	

Las Vegas Sands, Inc., its managing member
	

 	
 	

By:	

/s/  ROBERT G. GOLDSTEIN      
 Name: Robert G. Goldstein

Title: Senior Vice President
	 	 	 	 

5

 

	

 	
 	

VENETIAN HOTEL OPERATIONS, LLC
	

 	
 	

By:	

Venetian Casino Resort, LLC, its member
	

 	
 	

By:	

Las Vegas Sands, Inc., its managing member
	

 	
 	

By:	

/s/  ROBERT G. GOLDSTEIN      
 Name: Robert G. Goldstein

Title: Senior Vice President
	

 	
 	

LIDO INTERMEDIATE HOLDING COMPANY, LLC
	

 	
 	

By:	

Venetian Casino Resort, LLC, its member
	

 	
 	

By:	

Las Vegas Sands, Inc., its managing member
	

 	
 	

By:	

/s/  ROBERT G. GOLDSTEIN      
 Name: Robert G. Goldstein

Title: Senior Vice President
	

 	
 	

VENETIAN VENTURE DEVELOPMENT, LLC
	

 	
 	

By:	

Venetian Casino Resort, LLC, its member
	 	 	By:	Las Vegas Sands, Inc., its managing member
	

 	
 	

By:	

/s/  ROBERT G. GOLDSTEIN      
 Name: Robert G. Goldstein

Title: Senior Vice President
	 	 	 	 

6

 

	

 	
 	

VENETIAN OPERATING COMPANY, LLC
	

 	
 	

By:	

Venetian Casino Resort, LLC, its member
	

 	
 	

By:	

Las Vegas Sands, Inc., its managing member
	

 	
 	

By:	

/s/  ROBERT G. GOLDSTEIN      
 Name: Robert G. Goldstein

Title: Senior Vice President
	

 	
 	

VENETIAN MARKETING INC.
	

 	
 	

By:	

/s/  ROBERT G. GOLDSTEIN      
 Name: Robert G. Goldstein

Title: President
	

 	
 	

VENETIAN TRANSPORT, LLC
	

 	
 	

By:	

Las Vegas Sands, Inc., its managing member
	

 	
 	

By:	

/s/  ROBERT G. GOLDSTEIN      
 Name: Robert G. Goldstein

Title: Senior Vice President

7

QuickLinks

FIRST SUPPLEMENTAL INDENTURE

WITNESSETH

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