Document:

Form of Debt Securities Warrant Agreement and Warrant Certificate

 EXHIBIT 4.13 
 CORGENTECH INC. 
 and 
 _________________, As Warrant Agent 
 FORM OF DEBT SECURITIES 
 WARRANT AGREEMENT 
 Dated As Of
____________________ 

					
	 ARTICLE 1
	  	ISSUANCE OF WARRANTS AND EXECUTION AND DELIVERY OF WARRANT CERTIFICATES	  	1
			
	 1.1
	  	Issuance of Warrants	  	1
			
	 1.2
	  	Execution and Delivery of Warrant Certificates	  	2
			
	 1.3
	  	Issuance of Warrant Certificates	  	3
			
	ARTICLE 2	  	WARRANT PRICE, DURATION AND EXERCISE OF WARRANTS	  	3
			
	 2.1
	  	Warrant Price	  	3
			
	 2.2
	  	Duration of Warrants	  	3
			
	 2.3
	  	Exercise of Warrants	  	3
			
	 ARTICLE 3
	  	OTHER PROVISIONS RELATING TO RIGHTS OF HOLDERS OF WARRANT CERTIFICATES	  	5
			
	 3.1
	  	No Rights as Holders of Warrant Debt Securities Conferred by Warrants or Warrant Certificates	  	5
			
	 3.2
	  	Lost, Stolen, Mutilated or Destroyed Warrant Certificates	  	5
			
	 3.3
	  	Holder of Warrant Certificate May Enforce Rights	  	5
			
	 3.4
	  	Merger, Sale, Conveyance or Lease	  	5
			
	 3.5
	  	Notice to Warrantholders	  	6
		
	ARTICLE 4 EXCHANGE AND TRANSFER OF WARRANT CERTIFICATES	  	6
			
	 4.1
	  	Exchange and Transfer of Warrant Certificates	  	6
			
	 4.2
	  	Treatment of Holders of Warrant Certificates	  	7
			
	 4.3
	  	Cancellation of Warrant Certificates	  	7
		
	ARTICLE 5 CONCERNING THE WARRANT AGENT	  	8
			
	 5.1
	  	Warrant Agent	  	8
			
	 5.2
	  	Conditions of Warrant Agent’s Obligations	  	8
			
	 5.3
	  	Resignation, Removal and Appointment of Successors	  	9
		
	ARTICLE 6 MISCELLANEOUS	  	11
			
	 6.1
	  	Amendment	  	11
			
	 6.2
	  	Notices and Demands to the Company and Warrant Agent	  	11
			
	 6.3
	  	Addresses	  	11
			
	 6.4
	  	Governing Law	  	11
			
	 6.5
	  	Delivery of Prospectus	  	11
			
	 6.6
	  	Obtaining of Governmental Approvals	  	11
			
	 6.7
	  	Persons Having Rights Under Warrant Agreement	  	12

					
			
	 6.8
	  	Headings	  	12
			
	 6.9
	  	Counterparts	  	12
			
	 6.10
	  	Inspection of Agreement	  	12

 CORGENTECH INC. 
 Form of Debt Securities Warrant Agreement 
 DEBT SECURITIES
WARRANT AGREEMENT, dated as of                      between CORGENTECH
INC., a Delaware corporation (the “Company”) and                     , a [corporation]
[national banking association] organized and existing under the laws of                      and having a corporate trust office in
                    , as warrant agent (the “Warrant Agent”). 
 WHEREAS, the Company has entered into an indenture dated as of
[                     (the “Senior Indenture”), with
                    , as trustee (such trustee, and any successors to such trustee, herein called the “Senior
Trustee”), providing for the issuance from time to time of its unsubordinated debt securities, to be issued in one or more series as provided in the Senior Indenture (the “Debt Securities”);]
[                     (the “Subordinated Indenture”), with
                    , as trustee (such trustee, and any successors to such trustee, herein called the “Subordinated
Trustee”), providing for the issuance from time to time of its subordinated debt securities, to be issued in one or more series as provided in the Subordinated Indenture (the “Debt Securities”);] 
 WHEREAS, the Company proposes to sell [If Warrants are sold with other securities — title of such other Securities being
offered (the “Other Securities”) with] warrant certificates evidencing one or more warrants (the “Warrants” or, individually, a “Warrant”) representing the right to purchase
[title of Debt Securities purchasable through exercise of Warrants] (the “Warrant Debt Securities”), such warrant certificates and other warrant certificates issued pursuant to this Agreement being herein called the
“Warrant Certificates”; and 
 WHEREAS, the Company desires the Warrant Agent to act on behalf
of the Company, and the Warrant Agent is willing so to act, in connection with the issuance, registration, transfer, exchange, exercise and replacement of the Warrant Certificates, and in this Agreement wishes to set forth, among other things, the
form and provisions of the Warrant Certificates and the terms and conditions on which they may be issued, registered, transferred, exchanged, exercised and replaced; 
 NOW, THEREFORE, in consideration of the premises and of the mutual agreements herein contained, the parties hereto agree as follows: 
 ARTICLE 1 
 ISSUANCE OF WARRANTS AND
EXECUTION AND 
 DELIVERY OF WARRANT CERTIFICATES 
 1.1 Issuance of Warrants. [If Warrants alone — Upon issuance, each Warrant Certificate shall evidence one or more Warrants.] [If Other Securities and Warrants — Warrant Certificates shall be
[initially] issued in connection with the issuance of the Other Securities [but shall be separately transferable on and after
                                        
(the “Detachable Date”)] [and shall not be separately transferable] and each Warrant Certificate shall evidence one or more Warrants.] Each Warrant evidenced thereby shall represent the right, 

  

 1. 

 
subject to the provisions contained herein and therein, to purchase one Warrant Debt Security. [If Other Securities and Warrants - Warrant Certificates shall
be initially issued in units with the Other Securities and each Warrant Certificate included in such a unit shall evidence
                     Warrants for each [$             principal amount] [
                     shares] of Other Securities included in such unit.]. 
 1.2 Execution and Delivery of Warrant Certificates. Each Warrant Certificate, whenever issued, shall be in registered form substantially in
the form set forth in Exhibit A hereto, shall be dated the date of its countersignature by the Warrant Agent and may have such letters, numbers, or other marks of identification or designation and such legends or endorsements printed, lithographed
or engraved thereon as the officers of the Company executing the same may approve (execution thereof to be conclusive evidence of such approval) and as are not inconsistent with the provisions of this Agreement, or as may be required to comply with
any law or with any rule or regulation made pursuant thereto or with any rule or regulation of any securities exchange on which the Warrants may be listed, or to conform to usage. The Warrant Certificates shall be signed on behalf of the Company by
any of its present or future chief executive officers, presidents, senior vice presidents, vice presidents, chief financial officers, chief legal officers, treasurers, assistant treasurers, controllers, assistant controllers, secretaries or
assistant secretaries under its corporate seal reproduced thereon. Such signatures may be manual or facsimile signatures of such authorized officers and may be imprinted or otherwise reproduced on the Warrant Certificates. The seal of the Company
may be in the form of a facsimile thereof and may be impressed, affixed, imprinted or otherwise reproduced on the Warrant Certificates. 
 No
Warrant Certificate shall be valid for any purpose, and no Warrant evidenced thereby shall be exercisable, until such Warrant Certificate has been countersigned by the manual signature of the Warrant Agent. Such signature by the Warrant Agent upon
any Warrant Certificate executed by the Company shall be conclusive evidence that the Warrant Certificate so countersigned has been duly issued hereunder. 
 In case any officer of the Company who shall have signed any of the Warrant Certificates either manually or by facsimile signature shall cease to be such officer before the Warrant Certificates so signed shall have
been countersigned and delivered by the Warrant Agent, such Warrant Certificates may be countersigned and delivered notwithstanding that the person who signed Warrant Certificates ceased to be such officer of the Company; and any Warrant Certificate
may be signed on behalf of the Company by such persons as, at the actual date of the execution of such Warrant Certificate, shall be the proper officers of the Company, although at the date of the execution of this Agreement any such person was not
such officer. 
 The term “holder” or “holder of a Warrant Certificate” as used herein shall mean any person in whose
name at the time any Warrant Certificate shall be registered upon the books to be maintained by the Warrant Agent for that purpose [If Other Securities and Warrants are not immediately detachable - or upon the registration of the Other Securities
prior to the Detachable Date. Prior to the Detachable Date, the Company will, or will cause the registrar of the Other Securities to, make available at all times to the Warrant Agent such information as to holders of the Other Securities as may be
necessary to keep the Warrant Agent’s records up to date]. 
  

 2. 

 1.3 Issuance of Warrant Certificates. Warrant Certificates evidencing the right to purchase
Warrant Debt Securities may be executed by the Company and delivered to the Warrant Agent upon the execution of this Warrant Agreement or from time to time thereafter. The Warrant Agent shall, upon receipt of Warrant Certificates duly executed on
behalf of the Company, countersign such Warrant Certificates and shall deliver such Warrant Certificates to or upon the order of the Company. 
 ARTICLE 2 
 WARRANT PRICE, DURATION AND 
 EXERCISE OF WARRANTS 
 2.1 Warrant Price. During the period specified in Section 2.2,
each Warrant shall, subject to the terms of this Warrant Agreement and the applicable Warrant Certificate, entitle the holder thereof, to purchase the principal amount of Warrant Debt Securities specified in the applicable Warrant Certificate at an
exercise price of     % of the principal amount thereof [plus accrued amortization, if any, of the original issue discount of the Warrant Debt Securities] [plus accrued interest, if any, from the most recent date from
which interest shall have been paid on the Warrant Debt Securities or, if no interest shall have been paid on the Warrant Debt Securities, from the date of their initial issuance.] [The original issue discount
($             for each $1,000 principal amount of Warrant Debt Securities) will be amortized at a       % annual rate, computed on a[n] [semi-]
annual basis [using a 360-day year consisting of twelve 30-day months].] Such purchase price for the Warrant Debt Securities is referred to in this Agreement as the “Warrant Price.” 
 2.2 Duration of Warrants. Each Warrant may be exercised in whole or in part at any time, as specified herein, on or after [the date
thereof] [            ] and at or before [            ] p.m., [City] time, on
                     or such later date as the Company may designate by notice to the Warrant Agent and the holders of Warrant Certificates
mailed to their addresses as set forth in the record books of the Warrant Agent (the “Expiration Date”). Each Warrant not exercised at or before
[            ] p.m., [City] time, on the Expiration Date shall become void, and all rights of the holder of the Warrant Certificate evidencing such Warrant under this Agreement shall
cease. 
 2.3 Exercise of Warrants. 
 (a) During the period specified in Section 2.2, the Warrants may be exercised to purchase a whole number of Warrant Debt Securities in registered form by providing certain information as set forth on the
reverse side of the Warrant Certificate and by paying in full, in lawful money of the United States of America, [in cash or by certified check or official bank check in New York Clearing House funds] [by bank wire transfer in immediately available
funds] the Warrant Price for each Warrant Debt Security with respect to which a Warrant is being exercised to the Warrant Agent at its corporate trust office, provided that such exercise is subject to receipt within five business days of such
payment by the Warrant Agent of the Warrant Certificate with the form of election to purchase Warrant Debt Securities set forth on the reverse side of the Warrant Certificate properly completed and duly executed. The date on which payment in full of
the Warrant Price is received by the Warrant Agent shall, subject to 

  

 3. 

 
receipt of the Warrant Certificate as aforesaid, be deemed to be the date on which the Warrant is exercised; provided, however, that if, at the date
of receipt of such Warrant Certificates and payment in full of the Warrant Price, the transfer books for the Warrant Debt Securities purchasable upon the exercise of such Warrants shall be closed, no such receipt of such Warrant Certificates and no
such payment of such Warrant Price shall be effective to constitute the person so designated to be named as the holder of record of such Warrant Debt Securities on such date, but shall be effective to constitute such person as the holder of record
of such Warrant Debt Securities for all purposes at the opening of business on the next succeeding day on which the transfer books for the Warrant Debt Securities purchasable upon the exercise of such Warrants shall be opened, and the certificates
for the Warrant Debt Securities in respect of which such Warrants are then exercised shall be issuable as of the date on such next succeeding day on which the transfer books shall next be opened, and until such date the Company shall be under no
duty to deliver any certificate for such Warrant Debt Securities. The Warrant Agent shall deposit all funds received by it in payment of the Warrant Price in an account of the Company maintained with it and shall advise the Company by telephone at
the end of each day on which a payment for the exercise of Warrants is received of the amount so deposited to its account. The Warrant Agent shall promptly confirm such telephone advice to the Company in writing. 
 (b) The Warrant Agent shall, from time to time, as promptly as practicable, advise the Company of (i) the number of Warrant
Debt Securities with respect to which Warrants were exercised, (ii) the instructions of each holder of the Warrant Certificates evidencing such Warrants with respect to delivery of the Warrant Debt Securities to which such holder is entitled
upon such exercise, (iii) delivery of Warrant Certificates evidencing the balance, if any, of the Warrants for the remaining Warrant Debt Securities after such exercise, and (iv) such other information as the Company or the [Senior]
[Subordinated] Trustee shall reasonably require. 
 (c) As soon as practicable after the exercise of any Warrant, the
Company shall issue, pursuant to the Indenture, in authorized denominations, to or upon the order of the holder of the Warrant Certificate evidencing such Warrant, the Warrant Debt Securities to which such holder is entitled, in fully registered
form, registered in such name or names as may be directed by such holder. If fewer than all of the Warrants evidenced by such Warrant Certificate were exercised, the Company shall execute, and an authorized officer of the Warrant Agent shall
manually countersign and deliver, a new Warrant Certificate evidencing Warrants for the number of Warrant Debt Securities remaining unexercised. 
 (d) The Company shall not be required to pay any stamp or other tax or other governmental charge required to be paid in connection with any transfer involved in the issue of the Warrant Debt Securities, and in
the event that any such transfer is involved, the Company shall not be required to issue or deliver any Warrant Debt Securities until such tax or other charge shall have been paid or it has been established to the Company’s satisfaction that no
such tax or other charge is due. 
  

 4. 

 ARTICLE 3 
 OTHER PROVISIONS RELATING TO RIGHTS OF 
 HOLDERS OF WARRANT CERTIFICATES 
 3.1 No Rights as Holders of Warrant Debt Securities Conferred by Warrants or Warrant Certificates. No Warrant Certificate or Warrant
evidenced thereby shall entitle the holder thereof to any of the rights of a holder of Warrant Debt Securities, including, without limitation, the right to receive the payment of principal of (or premium, if any) or interest, if any, on the Warrant
Debt Securities or to enforce any of the covenants in the Indenture. 
 3.2 Lost, Stolen, Mutilated or Destroyed Warrant
Certificates. Upon receipt by the Warrant Agent of evidence reasonably satisfactory to it and the Company of the ownership of and the loss, theft, destruction or mutilation of any Warrant Certificate and/or indemnity reasonably satisfactory to
the Warrant Agent and the Company and, in the case of mutilation, upon surrender of the mutilated Warrant Certificate to the Warrant Agent for cancellation, then, in the absence of notice to the Company or the Warrant Agent that such Warrant
Certificate has been acquired by a bona fide purchaser, the Company shall execute, and an authorized officer of the Warrant Agent shall manually countersign and deliver, in exchange for or in lieu of the lost, stolen, destroyed or mutilated Warrant
Certificate, a new Warrant Certificate of the same tenor and evidencing Warrants for a like principal amount of Warrant Debt Securities. Upon the issuance of any new Warrant Certificate under this Section 3.2, the Company may require the
payment of a sum sufficient to cover any tax or other governmental charge that may be imposed in relation thereto and any other expenses (including the fees and expenses of the Warrant Agent) in connection therewith. Every substitute Warrant
Certificate executed and delivered pursuant to this Section 3.2 in lieu of any lost, stolen or destroyed Warrant Certificate shall represent an additional contractual obligation of the Company, whether or not the lost, stolen or destroyed
Warrant Certificate shall be at any time enforceable by anyone, and shall be entitled to the benefits of this Agreement equally and proportionately with any and all other Warrant Certificates duly executed and delivered hereunder. The provisions of
this Section 3.2 are exclusive and shall preclude (to the extent lawful) all other rights and remedies with respect to the replacement of mutilated, lost, stolen or destroyed Warrant Certificates. 
 3.3 Holder of Warrant Certificate May Enforce Rights. Notwithstanding any of the provisions of this Agreement, any holder of any Warrant
Certificate, without the consent of the Warrant Agent, the [Senior] [Subordinated] Trustee, the holder of any Warrant Debt Securities or the holder of any other Warrant Certificate, may, in such holder’s own behalf and for such holder’s
own benefit, enforce, and may institute and maintain any suit, action or proceeding against the Company suitable to enforce, or otherwise in respect of, such holder’s right to exercise the Warrants evidenced by such holder’s Warrant
Certificate in the manner provided in such holder’s Warrant Certificates and in this Agreement. 
 3.4 Merger, Sale,
Conveyance or Lease. In case of (a) any share exchange, merger or similar transaction of the Company with or into another person or entity (other than a share exchange, merger or similar transaction in which the Company is the acquiring or
surviving corporation) or (b) the sale, exchange, lease, transfer or other disposition of all or substantially all of the properties and assets of the Company as an entirety (in any such case, a 

  

 5. 

 
“Reorganization Event”), then, as a condition of such Reorganization Event, lawful provisions shall be made, and duly executed
documents evidencing the same from the Company’s successor shall be delivered to the holders of the Warrants, so that such successor shall succeed to and be substituted for the Company, and assume all the Company’s obligations under, this
Agreement and the Warrants. The Company shall thereupon be relieved of any further obligation hereunder or under the Warrants, and the Company as the predecessor corporation may thereupon or at any time thereafter be dissolved, wound up or
liquidated. Such successor or assuming entity thereupon may cause to be signed, and may issue either in its own name or in the name of the Company, any or all of the Warrants issuable hereunder which heretofore shall not have been signed by the
Company, and may execute and deliver securities in its own name, in fulfillment of its obligations to deliver Warrant Debt Securities upon exercise of the Warrants. All the Warrants so issued shall in all respects have the same legal rank and
benefit under this Agreement as the Warrants theretofore or thereafter issued in accordance with the terms of this Agreement as though all of such Warrants had been issued at the date of the execution hereof. In any case of any such Reorganization
Event, such changes in phraseology and form (but not in substance) may be made in the Warrants thereafter to be issued as may be appropriate. 
 The Warrant Agent may receive a written opinion of legal counsel as conclusive evidence that any such Reorganization Event complies with the provisions of this Section 3.4. 
 3.5 Notice to Warrantholders. In case the Company shall (a) effect any Reorganization Event or (b) make any distribution on or in
respect of the [title of Warrant Debt Securities] in connection with the dissolution, liquidation or winding up of the Company, then the Company shall mail to each holder of Warrants at such holder’s address as it shall appear on the books of
the Warrant Agent, at least ten days prior to the applicable date hereinafter specified, a notice stating the date on which such Reorganization Event, dissolution, liquidation or winding up is expected to become effective, and the date as of which
it is expected that holders of [title of Warrant Debt Securities] of record shall be entitled to exchange their shares of [title of Warrant Debt Securities] for securities or other property deliverable upon such Reorganization Event, dissolution,
liquidation or winding up. No failure to mail such notice nor any defect therein or in the mailing thereof shall affect any such transaction. 
 ARTICLE 4 
 EXCHANGE AND TRANSFER OF WARRANT CERTIFICATES 
 4.1 Exchange and Transfer of Warrant Certificates. [If Other Securities with Warrants which are immediately detachable —Upon] [If
Other Securities with Warrants which are not immediately detachable — Prior to the Detachable Date, a Warrant Certificate may be exchanged or transferred only together with the Other Security to which the Warrant Certificate was initially
attached, and only for the purpose of effecting or in conjunction with an exchange or transfer of such Other Security. Prior to any Detachable Date, each transfer of the Other Security shall operate also to transfer the related Warrant Certificates.
After the Detachable Date, upon] surrender at the corporate trust office of the Warrant Agent, Warrant Certificates evidencing Warrants may be exchanged for Warrant Certificates in other denominations evidencing such Warrants or the transfer thereof
may be registered in whole or in part; provided that such other Warrant Certificates evidence Warrants for the same aggregate principal amount 

  

 6. 

 
of Warrant Debt Securities as the Warrant Certificates so surrendered. The Warrant Agent shall keep, at its corporate trust office, books in which, subject
to such reasonable regulations as it may prescribe, it shall register Warrant Certificates and exchanges and transfers of outstanding Warrant Certificates, upon surrender of the Warrant Certificates to the Warrant Agent at its corporate trust office
for exchange or registration of transfer, properly endorsed or accompanied by appropriate instruments of registration of transfer and written instructions for transfer, all in form satisfactory to the Company and the Warrant Agent. No service charge
shall be made for any exchange or registration of transfer of Warrant Certificates, but the Company may require payment of a sum sufficient to cover any stamp or other tax or other governmental charge that may be imposed in connection with any such
exchange or registration of transfer. Whenever any Warrant Certificates are so surrendered for exchange or registration of transfer, an authorized officer of the Warrant Agent shall manually countersign and deliver to the person or persons entitled
thereto a Warrant Certificate or Warrant Certificates duly authorized and executed by the Company, as so requested. The Warrant Agent shall not be required to effect any exchange or registration of transfer which will result in the issuance of a
Warrant Certificate evidencing a Warrant for a fraction of a Warrant Debt Security or a number of Warrants for a whole number of Warrant Debt Securities and a fraction of a Warrant Debt Security. All Warrant Certificates issued upon any exchange or
registration of transfer of Warrant Certificates shall be the valid obligations of the Company, evidencing the same obligations and entitled to the same benefits under this Agreement as the Warrant Certificate surrendered for such exchange or
registration of transfer. 
 4.2 Treatment of Holders of Warrant Certificates. [If Other Securities and Warrants are not
immediately detachable—Prior to the Detachable Date, the Company, the Warrant Agent and all other persons may treat the owner of the Other Security as the owner of the Warrant Certificates initially attached thereto for any purpose and as the
person entitled to exercise the rights represented by the Warrants evidenced by such Warrant Certificates, any notice to the contrary notwithstanding. After the Detachable Date and prior to due presentment of a Warrant Certificate for registration
of transfer, the] [The] Company, the Warrant Agent and all other persons may treat the registered holder of a Warrant Certificate as the absolute owner thereof for any purpose and as the person entitled to exercise the rights represented by the
Warrants evidenced thereby, any notice to the contrary notwithstanding. 
 4.3 Cancellation of Warrant Certificates. Any
Warrant Certificate surrendered for exchange, registration of transfer or exercise of the Warrants evidenced thereby shall, if surrendered to the Company, be delivered to the Warrant Agent and all Warrant Certificates surrendered or so delivered to
the Warrant Agent shall be promptly canceled by the Warrant Agent and shall not be reissued and, except as expressly permitted by this Agreement, no Warrant Certificate shall be issued hereunder in exchange therefor or in lieu thereof. The Warrant
Agent shall deliver to the Company from time to time or otherwise dispose of canceled Warrant Certificates in a manner satisfactory to the Company. 
  

 7. 

 ARTICLE 5 
 CONCERNING THE WARRANT AGENT 
 5.1 Warrant Agent. The Company hereby appoints
                                        
as Warrant Agent of the Company in respect of the Warrants and the Warrant Certificates upon the terms and subject to the conditions herein set forth, and
                     hereby accepts such appointment. The Warrant Agent shall have the powers and authority granted to and conferred upon it
in the Warrant Certificates and hereby and such further power and authority to act on behalf of the Company as the Company may hereafter grant to or confer upon it. All of the terms and provisions with respect to such power and authority contained
in the Warrant Certificates are subject to and governed by the terms and provisions hereof. 
 5.2 Conditions of Warrant
Agent’s Obligations. The Warrant Agent accepts its obligations herein set forth upon the terms and conditions hereof, including the following to all of which the Company agrees and to all of which the rights hereunder of the holders from
time to time of the Warrant Certificates shall be subject: 
 (a) Compensation and Indemnification. The Company
agrees promptly to pay the Warrant Agent the compensation to be agreed upon with the Company for all services rendered by the Warrant Agent and to reimburse the Warrant Agent for reasonable out-of-pocket expenses (including reasonable counsel fees)
incurred without negligence, bad faith or willful misconduct by the Warrant Agent in connection with the services rendered hereunder by the Warrant Agent. The Company also agrees to indemnify the Warrant Agent for, and to hold it harmless against,
any loss, liability or expense incurred without negligence, bad faith or willful misconduct on the part of the Warrant Agent, arising out of or in connection with its acting as Warrant Agent hereunder, including the reasonable costs and expenses of
defending against any claim of such liability. 
 (b) Agent for the Company. In acting under this Warrant
Agreement and in connection with the Warrant Certificates, the Warrant Agent is acting solely as agent of the Company and does not assume any obligations or relationship of agency or trust for or with any of the holders of Warrant Certificates or
beneficial owners of Warrants. 
 (c) Counsel. The Warrant Agent may consult with counsel satisfactory to it,
which may include counsel for the Company, and the written advice of such counsel shall be full and complete authorization and protection in respect of any action taken, suffered or omitted by it hereunder in good faith and in accordance with the
advice of such counsel. 
 (d) Documents. The Warrant Agent shall be protected and shall incur no liability for
or in respect of any action taken or omitted by it in reliance upon any Warrant Certificate, notice, direction, consent, certificate, affidavit, statement or other paper or document reasonably believed by it to be genuine and to have been presented
or signed by the proper parties. 
 (e) Certain Transactions. The Warrant Agent, and its officers, directors and
employees, may become the owner of, or acquire any interest in, Warrants, with the same rights 

  

 8. 

 
that it or they would have if it were not the Warrant Agent hereunder, and, to the extent permitted by applicable law, it or they may engage or be interested
in any financial or other transaction with the Company and may act on, or as depositary, trustee or agent for, any committee or body of holders of Warrant Securities or other obligations of the Company as freely as if it were not the Warrant Agent
hereunder. Nothing in this Warrant Agreement shall be deemed to prevent the Warrant Agent from acting as [Senior] [Subordinated] Trustee under the [Senior] [Subordinated] Indenture. 
 (f) No Liability for Interest. Unless otherwise agreed with the Company, the Warrant Agent shall have no liability for
interest on any monies at any time received by it pursuant to any of the provisions of this Agreement or of the Warrant Certificates. 
 (g) No Liability for Invalidity. The Warrant Agent shall have no liability with respect to any invalidity of this Agreement or any of the Warrant Certificates (except as to the Warrant Agent’s
countersignature thereon). 
 (h) No Responsibility for Representations. The Warrant Agent shall not be
responsible for any of the recitals or representations herein or in the Warrant Certificates (except as to the Warrant Agent’s countersignature thereon), all of which are made solely by the Company. 
 (i) No Implied Obligations. The Warrant Agent shall be obligated to perform only such duties as are herein and in the
Warrant Certificates specifically set forth and no implied duties or obligations shall be read into this Agreement or the Warrant Certificates against the Warrant Agent. The Warrant Agent shall not be under any obligation to take any action
hereunder which may tend to involve it in any expense or liability, the payment of which within a reasonable time is not, in its reasonable opinion, assured to it. The Warrant Agent shall not be accountable or under any duty or responsibility for
the use by the Company of any of the Warrant Certificates authenticated by the Warrant Agent and delivered by it to the Company pursuant to this Agreement or for the application by the Company of the proceeds of the Warrant Certificates. The Warrant
Agent shall have no duty or responsibility in case of any default by the Company in the performance of its covenants or agreements contained herein or in the Warrant Certificates or in the case of the receipt of any written demand from a holder of a
Warrant Certificate with respect to such default, including, without limiting the generality of the foregoing, any duty or responsibility to initiate or attempt to initiate any proceedings at law or otherwise or, except as provided in
Section 6.2 hereof, to make any demand upon the Company. 
 5.3 Resignation, Removal and Appointment of Successors. 

(a) The Company agrees, for the benefit of the holders from time to time of the Warrant Certificates, that there shall at all
times be a Warrant Agent hereunder until all the Warrants have been exercised or are no longer exercisable. 
 (b) The
Warrant Agent may at any time resign as agent by giving written notice to the Company of such intention on its part, specifying the date on which its desired resignation shall become effective; provided that such date shall not be less than
three months after the date on which such notice is given unless the Company otherwise agrees. The Warrant 

  

 9. 

 
Agent hereunder may be removed at any time by the filing with it of an instrument in writing signed by or on behalf of the Company and specifying such
removal and the intended date when it shall become effective. Such resignation or removal shall take effect upon the appointment by the Company, as hereinafter provided, of a successor Warrant Agent (which shall be a bank or trust company authorized
under the laws of the jurisdiction of its organization to exercise corporate trust powers) and the acceptance of such appointment by such successor Warrant Agent. The obligation of the Company under Section 5.2(a) shall continue to the extent
set forth therein notwithstanding the resignation or removal of the Warrant Agent. 
 (c) In case at any time the
Warrant Agent shall resign, or shall be removed, or shall become incapable of acting, or shall be adjudged a bankrupt or insolvent, or shall commence a voluntary case under the Federal bankruptcy laws, as now or hereafter constituted, or under any
other applicable Federal or state bankruptcy, insolvency or similar law or shall consent to the appointment of or taking possession by a receiver, custodian, liquidator, assignee, trustee, sequestrator (or other similar official) of the Warrant
Agent or its property or affairs, or shall make an assignment for the benefit of creditors, or shall admit in writing its inability to pay its debts generally as they become due, or shall take corporate action in furtherance of any such action, or a
decree or order for relief by a court having jurisdiction in the premises shall have been entered in respect of the Warrant Agent in an involuntary case under the Federal bankruptcy laws, as now or hereafter constituted, or any other applicable
Federal or state bankruptcy, insolvency or similar law, or a decree or order by a court having jurisdiction in the premises shall have been entered for the appointment of a receiver, custodian, liquidator, assignee, trustee, sequestrator (or similar
official) of the Warrant Agent or of its property or affairs, or any public officer shall take charge or control of the Warrant Agent or of its property or affairs for the purpose of rehabilitation, conservation, winding up or liquidation, a
successor Warrant Agent, qualified as aforesaid, shall be appointed by the Company by an instrument in writing, filed with the successor Warrant Agent. Upon the appointment as aforesaid of a successor Warrant Agent and acceptance by the successor
Warrant Agent of such appointment, the Warrant Agent shall cease to be Warrant Agent hereunder. 
 (d) Any successor
Warrant Agent appointed hereunder shall execute, acknowledge and deliver to its predecessor and to the Company an instrument accepting such appointment hereunder, and thereupon such successor Warrant Agent, without any further act, deed or
conveyance, shall become vested with all the authority, rights, powers, trusts, immunities, duties and obligations of such predecessor with like effect as if originally named as Warrant Agent hereunder, and such predecessor, upon payment of its
charges and disbursements then unpaid, shall thereupon become obligated to transfer, deliver and pay over, and such successor Warrant Agent shall be entitled to receive, all monies, securities and other property on deposit with or held by such
predecessor, as Warrant Agent hereunder. 
 (e) Any corporation into which the Warrant Agent hereunder may be merged or
converted or any corporation with which the Warrant Agent may be consolidated, or any corporation resulting from any merger, conversion or consolidation to which the Warrant Agent shall be a party, or any corporation to which the Warrant Agent shall
sell or otherwise transfer all or substantially all the assets and business of the Warrant Agent, provided that it shall be qualified as aforesaid, shall be the successor Warrant Agent under this Agreement without the execution or filing of
any paper or any further act on the part of any of the parties hereto. 
  

 10. 

 ARTICLE 6 
 MISCELLANEOUS 
 6.1 Amendment. This Agreement may be amended by the parties hereto, without
the consent of the holder of any Warrant Certificate, for the purpose of curing any ambiguity, or of curing, correcting or supplementing any defective provision contained herein, or making any other provisions with respect to matters or questions
arising under this Agreement as the Company and the Warrant Agent may deem necessary or desirable; provided that such action shall not materially adversely affect the interests of the holders of the Warrant Certificates. 
 6.2 Notices and Demands to the Company and Warrant Agent. If the Warrant Agent shall receive any notice or demand addressed to the Company by the
holder of a Warrant Certificate pursuant to the provisions of the Warrant Certificates, the Warrant Agent shall promptly forward such notice or demand to the Company. 
 6.3 Addresses. Any communication from the Company to the Warrant Agent with respect to this Agreement shall be addressed to ______________, Attention: ____________ and any communication from the Warrant Agent
to the Company with respect to this Agreement shall be addressed to 650 Gateway Boulevard, South San Francisco, CA 94080, Attn: General Counsel (or such other address as shall be specified in writing by the Warrant Agent or by the Company).

 6.4 Governing Law. This Agreement and each Warrant Certificate issued hereunder shall be governed by and construed in accordance
with the laws of the State of New York. 
 6.5 Delivery of Prospectus. The Company shall furnish to the Warrant Agent sufficient
copies of a prospectus meeting the requirements of the Securities Act of 1933, as amended, relating to the Warrant Debt Securities deliverable upon exercise of the Warrants (the “Prospectus”), and the Warrant Agent agrees
that upon the exercise of any Warrant, the Warrant Agent will deliver to the holder of the Warrant Certificate evidencing such Warrant, prior to or concurrently with the delivery of the Warrant Debt Securities issued upon such exercise, a
Prospectus. 
 The Warrant Agent shall not, by reason of any such delivery, assume any responsibility for the accuracy or adequacy of such Prospectus.

 6.6 Obtaining of Governmental Approvals. The Company will from time to time take all action which may be necessary to obtain and
keep effective any and all permits, consents and approvals of governmental agencies and authorities and securities act filings under United States Federal and state laws (including without limitation a registration statement in respect of the
Warrants and Warrant Debt Securities under the Securities Act of 1933, as amended), which may be or become requisite in connection with the issuance, sale, transfer, and delivery of the Warrant Debt Securities issued upon exercise of the Warrants,
the issuance, sale, transfer and delivery of the Warrants or upon the expiration of the period during which the Warrants are exercisable. 
  

 11. 

 6.7 Persons Having Rights Under Warrant Agreement. Nothing in this Agreement shall give to any
person other than the Company, the Warrant Agent and the holders of the Warrant Certificates any right, remedy or claim under or by reason of this Agreement. 
 6.8 Headings. The descriptive headings of the several Articles and Sections of this Agreement are inserted for convenience only and shall not control or affect the meaning or construction of any of the
provisions hereof. 
 6.9 Counterparts. This Agreement may be executed in any number of counterparts, each of which as so executed
shall be deemed to be an original, but such counterparts shall together constitute but one and the same instrument. 
 6.10 Inspection of
Agreement. A copy of this Agreement shall be available at all reasonable times at the principal corporate trust office of the Warrant Agent for inspection by the holder of any Warrant Certificate. The Warrant Agent may require such holder to
submit his Warrant Certificate for inspection by it. 
  

 12. 

 IN WITNESS WHEREOF, the parties hereto have caused
this Agreement to be duly executed, all as of the day and year first above written. 
  

									
		 		 	CORGENTECH INC.
					
		 		 		 	 By    
	 	  
					
		 		 		 	 Its
	 	  
					
	 Attest:
	 	  	 		 		 	
				
		 		 		 	 _______________________________________________, as

				
		 		 		 	 Warrant Agent

					
		 		 		 	 By    
	 	  
					
		 		 		 	 Its     
	 	  
					
	 Attest:
	 	  	 		 		 	

 [SIGNATURE PAGE TO DEBT
SECURITIES WARRANT AGREEMENT] 

 EXHIBIT A 
 FORM OF WARRANT CERTIFICATE 
 [Face of Warrant Certificate] 
  

			
	[Form if Warrants are attached to Other Securities and are not immediately detachable.	  	Prior to _____________, this Warrant Certificate cannot be transferred or exchanged unless attached to a [Title of Other Security].]
	[Form of Legend if Warrants are not immediately exercisable.	  	Prior to _____________, Warrants evidenced by this Warrant Certificate cannot be exercised.]

 EXERCISABLE ONLY IF COUNTERSIGNED BY THE WARRANT 
 AGENT AS PROVIDED HEREIN 
 VOID AFTER
[            ] P.M., [CITY] TIME, ON ______________, 
 CORGENTECH INC.

 WARRANT CERTIFICATE REPRESENTING 
 WARRANTS TO PURCHASE 
 [TITLE OF WARRANT DEBT SECURITIES] 
  

  

			
	No.	  	Warrants

 This certifies that _________________ or registered assigns is the registered owner of the above
indicated number of Warrants, each Warrant entitling such owner [If Warrants are attached to Other Securities and are not immediately detachable —, subject to the registered owner qualifying as a “Holder” of this Warrant Certificate,
as hereinafter defined)] to purchase, at any time [after [            ] p.m., [City] time, on ________ and] on or before
[            ] p.m., [City] time, on __________, $________ principal amount of [Title of Warrant Debt Securities] (the “Warrant Debt Securities”), of Corgentech Inc.
(the “Company”), issued or to be issued under the Indenture (as hereinafter defined), on the following basis: during the period from _________, through and including _______, each Warrant shall entitle the Holder thereof,
subject to the provisions of this Agreement, to purchase the principal amount of Warrant Debt Securities stated in the Warrant Certificate at the warrant price (the “Warrant Price”) of ____% of the principal amount thereof
[plus accrued amortization, if any, of the original issue discount of the Warrant Debt Securities] [plus accrued interest, if any, from the most recent date from which interest shall have been paid on the Warrant Debt Securities or, if no interest
shall have been paid on the Warrant Debt Securities, from the date of their original issuance]. [The original issue discount ($_____ for each $1,000 principal amount of Warrant Debt Securities) will be amortized at a ____% annual rate, computed on
a[n] [semi-]annual basis [using a 360-day year consisting of twelve 30-day months]. The Holder may exercise the Warrants evidenced hereby by providing certain information set forth on the back hereof and by paying in full, in lawful 

  

 A-1 

 
money of the United States of America, [in cash or by certified check or official bank check in New York Clearing House funds] [by bank wire transfer in
immediately available funds], the Warrant Price for each Warrant Debt Security with respect to which this Warrant is exercised to the Warrant Agent (as hereinafter defined) and by surrendering this Warrant Certificate, with the purchase form on the
back hereof duly executed, at the corporate trust office of [name of Warrant Agent], or its successor as warrant agent (the “Warrant Agent”), which is, on the date hereof, at the address specified on the reverse hereof, and
upon compliance with and subject to the conditions set forth herein and in the Warrant Agreement (as hereinafter defined). 
 The term
“Holder” as used herein shall mean [If Warrants are attached to Other Securities and are not immediately detachable—, prior to ___________, _____ (the “Detachable Date”), the registered owner of
the Company’s [title of Other Securities] to which this Warrant Certificate was initially attached, and after such Detachable Date,] the person in whose name at the time this Warrant Certificate shall be registered upon the books to be
maintained by the Warrant Agent for that purpose pursuant to Section 4 of the Warrant Agreement. 
 The Warrants evidenced by this
Warrant Certificate may be exercised to purchase Warrant Debt Securities in the principal amount of $1,000 or any integral multiple thereof in registered form. Upon any exercise of fewer than all of the Warrants evidenced by this Warrant
Certificate, there shall be issued to the Holder hereof a new Warrant Certificate evidencing Warrants for the aggregate principal amount of Warrant Debt Securities remaining unexercised. 
 This Warrant Certificate is issued under and in accordance with the Warrant Agreement dated as of _____________, ____ (the “Warrant
Agreement”), between the Company and the Warrant Agent and is subject to the terms and provisions contained in the Warrant Agreement, to all of which terms and provisions the Holder of this Warrant Certificate consents by acceptance
hereof. Copies of the Warrant Agreement are on file at the above-mentioned office of the Warrant Agent. 
 The Warrant Debt Securities
to be issued and delivered upon the exercise of Warrants evidenced by this Warrant Certificate will be issued under and in accordance with an Indenture, [dated as of _________, ______ (the “Senior Indenture”), between the
Company and _____________, as trustee (such trustee, and any successors to such trustee, the “Senior Trustee”)] [dated as of __________, ______, (the “Subordinated Indenture”), between the Company and
_____________, as trustee (such trustee, and any successors to such trustee, the “Subordinated Trustee”)] and will be subject to the terms and provisions contained in the Warrant Debt Securities and in the Indenture.
Copies of the [Senior] [Subordinated] Indenture, including the form of the Warrant Debt Securities, are on file at the corporate trust office of the Trustee. 
 [If Warrants are attached to Other Securities and are not immediately detachable—Prior to the Detachable Date, this Warrant Certificate may be exchanged or transferred only together with the [Title of Other
Securities] (the “Other Securities”) to which this Warrant Certificate was initially attached, and only for the purpose of effecting or in conjunction with, an exchange or transfer of such Other Security. Additionally, on or
prior to the Detachable Date, each transfer of such Other Security on the register of the Other Securities shall operate also to transfer this Warrant Certificate. After such date, transfer of this] [If Warrants are attached to Other 

  

 A-2 

 
Securities and are immediately detachable — Transfer of this] Warrant Certificate may be registered when this Warrant Certificate is surrendered at the
corporate trust office of the Warrant Agent by the registered owner or such owner’s assigns, in the manner and subject to the limitations provided in the Warrant Agreement. 
 [If Other Securities with Warrants which are not immediately detachable-Except as provided in the immediately preceding paragraph, after] [If Other
Securities with Warrants which are immediately detachable or Warrants alone—After] countersignature by the Warrant Agent and prior to the expiration of this Warrant Certificate, this Warrant Certificate may be exchanged at the corporate trust
office of the Warrant Agent for Warrant Certificates representing Warrants for the same aggregate principal amount of Warrant Debt Securities. 
 This Warrant Certificate shall not entitle the Holder hereof to any of the rights of a holder of the Warrant Debt Securities, including, without limitation, the right to receive payments of principal of (and premium, if any) or interest, if
any, on the Warrant Debt Securities or to enforce any of the covenants of the Indenture. 
 Reference is hereby made to the further
provisions of this Warrant Certificate set forth on the reverse hereof, which further provisions shall for all purposes have the same effect as if set forth at this place. 
 This Warrant Certificate shall not be valid or obligatory for any purpose until countersigned by the Warrant Agent. 
  

 A-3 

 IN WITNESS WHEREOF, the Company has caused this
Warrant to be executed in its name and on its behalf by the facsimile signatures of its duly authorized officers. 
  

									
	 Dated:
	 	  	 		 	CORGENTECH INC.
					
		 		 		 	 By
	 	  
					
		 		 		 	 Its
	 	  
			
	 Attest:
	 		 	
				
	  	 		 		 	
			
	 Countersigned:
	 		 	
				
	  	 		 		 	
	 As Warrant Agent
	 		 		 	
					
	By	 	  	 		 		 	
		 	 Authorized Signature
	 		 		 	

  

 A-4 

 [REVERSE OF WARRANT CERTIFICATE] 
 (Instructions for Exercise of Warrants) 
 To exercise any Warrants evidenced hereby for
Warrant Debt Securities (as hereinafter defined), the Holder must pay, in lawful money of the United States of America, [in cash or by certified check or official bank check in New York Clearing House funds] [by bank wire transfer in immediately
available funds], the Warrant Price in full for Warrants exercised, to [Warrant Agent] [address of Warrant Agent], Attn: _____________, which payment must specify the name of the Holder and the number of Warrants exercised by such Holder. In
addition, the Holder must complete the information required below and present this Warrant Certificate in person or by mail (certified or registered mail is recommended) to the Warrant Agent at the appropriate address set forth above. This Warrant
Certificate, completed and duly executed, must be received by the Warrant Agent within five business days of the payment. 
 (To be executed
upon exercise of Warrants) 
 The undersigned hereby irrevocably elects to exercise __________ Warrants, represented by this Warrant
Certificate, to purchase $______ principal amount of the [Title of Warrant Debt Securities] (the “Warrant Debt Securities”) of Corgentech, Inc. and represents that he has tendered payment for such Warrant Debt Securities, in
lawful money of the United States of America, [in cash or by certified check or official bank check in New York Clearing House funds] [by bank wire transfer in immediately available funds], to the order of Corgentech Inc., c/o [insert name and
address of Warrant Agent], in the amount of $__________ in accordance with the terms hereof. The undersigned requests that said principal amount of Warrant Debt Securities be in fully registered form in the authorized denominations, registered in
such names and delivered all as specified in accordance with the instructions set forth below. 
 If the number of Warrants exercised is less
than all the Warrants evidenced hereby, the undersigned requests that a new Warrant Certificate evidencing the Warrants for the aggregate principal amount of Warrant Debt Securities remaining unexercised be issued and delivered to the undersigned
unless otherwise specified in the instructions below. 
  

					
	Dated___________________	 	Name	 	  
	 	 		 	(Please Print)
			
		 	 Address
	 	  
		
		 	  
		
		 	  
		
		 	 (Insert Social Security or Other Identifying
 Number of Holder)

  

 A-5 

					
	Signature Guaranteed	 		 	  
	 	 		 	Signature
			
		 		 	 (Signature must conform in all respects to
 name of
holder as specified on the face of
 this Warrant Certificate and must bear a
 signature guarantee by a bank, trust
 company or member broker of the New
 York, Midwest or Pacific Stock Exchange)

 This Warrant may be exercised at the following addresses: 
  

			
	By hand at 	  	  
		  	  
		  	  

  

			
	By mail at 	  	  
		  	  
		  	  

  
 [Instructions as to form and delivery
of Warrant Debt Securities and, if applicable, Warrant Certificates evidencing Warrants for the number of Warrant Debt Securities remaining unexercised — complete as appropriate.] 
  

 A-6 

 ASSIGNMENT 
 [Form of assignment to be executed if 
 Warrant Holder desires to transfer Warrant] 
 FOR VALUE RECEIVED, ______________________________________________________ hereby sells, assigns and transfers unto: 
  

					
	 	 		 	
	 	 		 	
	   
	(Please print name and address including zip code)	 		 	Please insert Social Security or other identifying number

 the right represented by the within Warrant to purchase $_______ aggregate principal amount of [Title of Warrant
Debt Securities] of Corgentech Inc. to which the within Warrant relates and appoints ____________ attorney to transfer such right on the books of the Warrant Agent with full power of substitution in the premises. 
  

					
	 Dated________________________
	 		 	  
		 		 	 Signature

			
	 	 		 	(Signature must conform in all respects to name of holder as specified on the face of the Warrant)
			
	 Signature Guaranteed
	 		 	
			
	  	 		 	

  

 A-7Sixth Amendment to Credit Agreement

 Exhibit 10.4 
 REVOLVER CREDIT AGREEMENT 
 SIXTH AMENDMENT TO CREDIT AGREEMENT 
 This SIXTH AMENDMENT TO CREDIT AGREEMENT (this “Amendment”) is entered into as of March     ,
2006, among WESTLAKE CHEMICAL CORPORATION (“Westlake”) and certain of its domestic subsidiaries listed as Borrowers to the Credit Agreement described below (collectively, the “Borrowers”),
Lenders under the Credit Agreement, BANK OF AMERICA, N.A., in its capacity as Agent for Lenders under the Credit Agreement (the “Agent”), and Guarantors under the Credit Agreement (hereinafter defined). 
 Reference is made to the Credit Agreement, dated as of July 31, 2003 (as amended, modified, and supplemented, the “Credit
Agreement”), among the Borrowers, the Agent, and Lenders party thereto. Unless otherwise defined in this Amendment, capitalized terms used herein shall have the meanings set forth in the Credit Agreement and all Section references
herein are to Sections in the Credit Agreement. 
 RECITALS 
 A. Borrowers have requested that Lenders agree to amend certain provisions of the Credit Agreement, including without limitation, amending certain
covenants and increasing the Maximum Inventory Loan Amount. 
 B. Subject to the terms and conditions of this Amendment, Lenders are willing
to agree to such amendments. 
 Accordingly, for adequate and sufficient consideration, the parties hereto agree, as follows: 
 Paragraph 1. Amendments to Credit Agreement. By execution of this Amendment, the Credit Agreement is hereby amended as follows: 
 1.1 December Financial Reports. The first sentence of Section 5.2(c) of the Credit Agreement is amended in its entirety to
read as follows: 
 “(c) As soon as available, but in any event not later than thirty (30) days after the end of each month other
than March, June, September, or December (and, as soon as available, but in any event not later than forty-five (45) days after the end of each March, June, and September, and, as soon as available, but in any event not later than the earlier
of (i) the filing of Financial Statements with the SEC pursuant to Section 5.2(a) and (ii) ninety (90) days after the end of each December, and without duplication of the Financial Statements required by
Section 5.2(b)), consolidated unaudited balance sheets of Westlake and its Subsidiaries as at the end of such month, and consolidated unaudited income statements and cash flow statements for Westlake and its Subsidiaries for such
month and for the period from the beginning of the Fiscal Year to the end of such month, all in reasonable detail, fairly presenting the financial position and results of operations of Westlake and its Subsidiaries as at the date thereof and for
such periods, and prepared in accordance with GAAP (except for the inclusion of necessary footnotes) applied consistently with the audited Financial Statements required to be delivered pursuant to Section 5.2(a), together with a
schedule setting forth in reasonable detail the calculation of the Fixed Charge Coverage Ratio for the immediately preceding twelve (12) month period.” 
  

					
		  	    1        	  	Sixth Amendment to Revolver Credit Agreement

 1.2 Accounts Receivable Reporting. Section 5.2(l) of the Credit Agreement is
amended in its entirety to read as follows: 
 “ (l) As soon as available, but in any event by the second Business Day of each week
for the prior week ending on the last Business Day of such prior week; provided that not more than four (4) times in any fiscal year, the following may be delivered by the third Business Day of such week, in form and substance reasonably
satisfactory to the Agent: (i) a schedule of each Loan Party’s Accounts created, credit memoranda, and collections for the applicable week, together with a reconciliation of each Loan Party’s Accounts created, credit memos,
collections and other adjustments to Accounts since the last such weekly reconciliation and a Borrowing Base Certificate; (ii) a summary of each credit memorandum in excess of $1,000,000; (iii) after the occurrence of the Account
Triggering Date, an Inventory report; and (iv) with the delivery of each of the foregoing, a certificate executed by a Responsible Officer on behalf of all of the Loan Parties certifying as to the accuracy and completeness of the foregoing;
provided that so long as the sum of Availability plus the unrestricted cash of Westlake and its Subsidiaries (A) exceeds $200,000,000 or (B) becomes less than $200,000,000 (during which time the reports and information required to
be delivered pursuant to this Section 5.2(l) shall be delivered on a weekly basis as aforesaid) but thereafter exceeds $250,000,000 for a period of three consecutive months and continues to exceed $200,000,000 after the end of
such three consecutive month period, the reports and other information required to be delivered pursuant to this Section 5.2(l) shall be required to be delivered as soon as available, but in any event within fifteen (15) days
after the end of each month or more frequently as requested by the Agent to determine Availability or otherwise.” 
 1.3 Maximum Inventory Loan
Amount. The definition of Maximum Inventory Loan Amount in Annex A to the Credit Agreement is amended in its entirety to read as follows: 
 "“Maximum Inventory Loan Amount” means $200,000,000.” 
 Paragraph 2. Amendments to
Security Agreements. By execution of this Amendment, each of the “$100,000,” “$250,000,” and “$500,000” amounts appearing in Sections 11(b), (d) and (e) of each of
the Security Agreements is amended to read “$1,000,000.” 
 Paragraph 3. Effective Date. Notwithstanding any contrary
provision, this Amendment is not effective until the date (the “Effective Date”) upon which: 
 (a) the Agent has
received counterparts of this Amendment executed by each Borrower, each Guarantor, Agent, and each Lender; 
 (b) all representations and
warranties made hereunder and in the other Loan Documents shall be true and correct as of the date hereof as though made on and as of the date hereof, other than any such representation or warranty which relates to a specified prior date;

 (c) No Default or Event of Default shall have occurred and be continuing; and 
 (d) Borrowers shall have paid Attorney Costs of the Agent incurred in connection with the Loan Documents, including any outstanding Attorney Costs of the
Agent on the Effective Date. 
 Paragraph 4. Acknowledgment and Ratification. As a material inducement to the Agent and Lenders to
execute and deliver this Amendment, each Borrower and each Guarantor (a) consent to the agreements in this Amendment; and (b) agree and acknowledge that the execution, delivery, and performance of this Amendment shall in no way release,
diminish, impair, reduce, or otherwise affect the respective obligations of Borrowers or Guarantors under their respective Loan Documents, which Loan Documents shall remain in full force and effect, and all Liens, guaranties, and rights thereunder
are hereby ratified and confirmed. 
  

					
		  	    2        	  	Sixth Amendment to Revolver Credit Agreement

 Paragraph 5. Representations. As a material inducement to Lenders to execute and deliver this
Amendment, each Borrower and each Guarantor represent and warrant to Lenders (with the knowledge and intent that Lenders are relying upon the same in entering into this Amendment) that as of the Effective Date and as of the date of execution of this
Amendment, (a) all representations and warranties in the Loan Documents are true and correct in all material respects as though made on the date hereof, except to the extent that (i) any of them speak to a different specific date or
(ii) the facts on which any of them were based have been changed by transactions contemplated or permitted by the Credit Agreement, (b) no Default or Event of Default exists, (c) the attachments to, and the certifications made in, the
Officer’s Certificates executed and delivered to the Agent and Lenders in connection with the Fifth Amendment to the Credit Agreement dated as of January 6, 2006, have not been modified or amended, remain in full force and effect, and are
hereby ratified and confirmed and (d) the execution, delivery and performance of this Amendment have been duly authorized by all necessary partnership and corporate action and this Amendment constitutes the valid and binding obligation of each
of them. 
 Paragraph 6. Fees and Expenses. Borrowers shall pay all reasonable costs, fees, and expenses paid or
incurred by the Agent in connection with this Amendment, including, without limitation, Attorney Costs of the Agent in connection with the negotiation, preparation, delivery, and execution of this Amendment and any related documents. 
 Paragraph 7. Waiver. Each Loan Party (i) acknowledges and agrees that, as of the date hereof, it has no actual or potential claim or cause of
action against Agent or any Lender relating to any Loan Documents or any actions or events occurring on or before the date of this Amendment and (ii) waives and releases any right to assert such claim or cause of action to the extent based on
actions or events occurring on or before the date hereof. 
 Paragraph 8. Miscellaneous. 
 8.1 This Amendment is a “Loan Document” referred to in the Credit Agreement, and the provisions relating to Loan Documents in
Article 13 of the Credit Agreement are incorporated in this Amendment by reference. Unless stated otherwise (a) the singular number includes the plural and vice versa and words of any gender include each other gender,
in each case, as appropriate, (b) headings and captions may not be construed in interpreting provisions, (c) this Amendment must be construed, and its performance enforced, under New York law, (d) if any part of this Amendment is for
any reason found to be unenforceable, all other portions of it nevertheless remain enforceable, and (e) this Amendment may be executed in any number of counterparts with the same effect as if all signatories had signed the same document, and
all of those counterparts must be construed together to constitute the same document. 
 8.2 The Loan Documents shall remain unchanged and in
full force and effect, except as provided in this Amendment, and are hereby ratified and confirmed. On and after the Effective Date, all references to the “Credit Agreement” shall be to the Credit Agreement as herein amended. The
execution, delivery, and effectiveness of this Amendment shall not, except as expressly provided herein, operate as a waiver of any rights of Lenders under any Loan Document, nor constitute a waiver under any of the Loan Documents. 
 Paragraph 9. ENTIRE AGREEMENT. THIS AMENDMENT
REPRESENTS THE FINAL AGREEMENT BETWEEN THE PARTIES ABOUT THE SUBJECT MATTER
OF THIS AMENDMENT AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR,
CONTEMPORANEOUS, OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO
UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES. 
 Paragraph 10. Parties. This Amendment binds and inures to Borrowers, Guarantors, the Agent, Lenders, and their respective successors and assigns. 
 The parties hereto have executed this Amendment in multiple counterparts to be effective as of the Effective Date. 
 Remainder of Page Intentionally Blank. 
 Signature Pages to Follow. 
  

					
		  	    3        	  	Sixth Amendment to Revolver Credit Agreement

 Signature Page to that certain Sixth Amendment to Credit Agreement dated as of the date first stated above, among
Westlake Chemical Corporation and certain of its domestic subsidiaries, as Borrowers, Bank of America, N.A., in its capacity as Agent, Required Lenders, and Guarantors. 
 BANK OF AMERICA, N.A., as the Agent and a Lender 
  

			
	By:	 	 /s/ Robert Mostert

	Name:	 	Robert Mostert
	Title:	 	Vice President

  

 Signature Page to Sixth Amendment 

 Signature Page to that certain Sixth Amendment to Credit Agreement dated as of the date first stated above, among
Westlake Chemical Corporation and certain of its domestic subsidiaries, as Borrowers, Bank of America, N.A., in its capacity as Agent, Required Lenders, and Guarantors. 
 GENERAL ELECTRIC CAPITAL CORPORATION, 
 as a Lender 
  

			
	By:	 	 /s/ Bond Harberts

	Name:	 	Bond Harberts
	Title:	 	Duly Authorized Signatory

  

 Signature Page to Sixth Amendment 

 Signature Page to that certain Sixth Amendment to Credit Agreement dated as of the date first stated above, among
Westlake Chemical Corporation and certain of its domestic subsidiaries, as Borrowers, Bank of America, N.A., in its capacity as Agent, Required Lenders, and Guarantors. 
 THE CIT GROUP/BUSINESS CREDIT, INC., 
 as a Lender 
  

			
	By:	 	 /s/ David Rothberg

	Name:	 	David Rothberg
	Title:	 	Assistant Vice President

  

 Signature Page to Sixth Amendment 

 Signature Page to that certain Sixth Amendment to Credit Agreement dated as of the date first stated above, among
Westlake Chemical Corporation and certain of its domestic subsidiaries, as Borrowers, Bank of America, N.A., in its capacity as Agent, Required Lenders, and Guarantors. 
 PNC BANK, NATIONAL ASSOCIATION, 
 as a Lender 
  

			
	By:	 	 /s/ Timothy S. Culver

	Name:	 	Timothy S. Culver
	Title:	 	Vice President

  

 Signature Page to Sixth Amendment 

 Signature Page to that certain Sixth Amendment to Credit Agreement dated as of the date first stated above, among
Westlake Chemical Corporation and certain of its domestic subsidiaries, as Borrowers, Bank of America, N.A., in its capacity as Agent, Required Lenders, and Guarantors. 
 WELLS FARGO FOOTHILL, LLC, 
 as a Lender 
  

			
	By:	 	 /s/ Juan Barrera

	Name:	 	Juan Barrera
	Title:	 	Vice President

  

 Signature Page to Sixth Amendment 

 Signature Page to that certain Sixth Amendment to Credit Agreement dated as of the date first stated above, among
Westlake Chemical Corporation and certain of its domestic subsidiaries, as Borrowers, Bank of America, N.A., in its capacity as Agent, Required Lenders, and Guarantors. 
 LASALLE BUSINESS CREDIT, LLC, 
 as a Lender 
  

			
	 By:
	 	 /s/ Douglas Colletti

	Name:	 	Douglas Colletti
	Title:	 	Senior Vice President

  

 Signature Page to Sixth Amendment 

 Signature Page to that certain Sixth Amendment to Credit Agreement dated as of the date first stated above, among
Westlake Chemical Corporation and certain of its domestic subsidiaries, as Borrowers, Bank of America, N.A., in its capacity as Agent, Required Lenders, and Guarantors. 
 UBS AG, STAMFORD BRANCH, 
 as a Lender 
  

			
	By:	 	 /s/ Luis Pistecchia

	Name:	 	Louis Pistecchia
	Title:	 	Director Banking Products Services, US
		
	By:	 	 /s/ Douglas Gervolino

	Name:	 	Douglas Gervolino
	Title:	 	Associated Director Banking Products Services, US

  

 Signature Page to Sixth Amendment 

 Signature Page to that certain Sixth Amendment to Credit Agreement dated as of the date first stated above, among
Westlake Chemical Corporation and certain of its domestic subsidiaries, as Borrowers, Bank of America, N.A., in its capacity as Agent, Required Lenders, and Guarantors. 
 CREDIT SUISSE FIRST BOSTON, acting through 
 its Cayman Islands Branch, as a
Lender 
  

			
	By:	 	 /s/ Alain Dacust

	Name:	 	Alain Dacust
	Title:	 	Director
		
	By:	 	 /s/ Denise L. Alvarez

	Name:	 	Denise L. Alvarez
	Title:	 	Associate

  

 Signature Page to Sixth Amendment 

 Signature Page to that certain Sixth Amendment to Credit Agreement dated as of the date first stated above, among
Westlake Chemical Corporation and certain of its domestic subsidiaries, as Borrowers, Bank of America, N.A., in its capacity as Agent, Required Lenders, and Guarantors. 
 DEUTSCHE BANK TRUST COMPANY AMERICAS, 
 as a Lender 
  

			
	By:	 	 /s/ Marguerite Sutton

	Name:	 	Marguerite Sutton
	Title:	 	Director
		
	By:	 	 /s/ Frank Fazio

	Name:	 	Frank Fazio
	Title:	 	Director

  

 Signature Page to Sixth Amendment 

 Signature Page to that certain Sixth Amendment to Credit Agreement dated as of the date first stated above, among
Westlake Chemical Corporation and certain of its domestic subsidiaries, as Borrowers, Bank of America, N.A., in its capacity as Agent, Required Lenders, and Guarantors. 
  

							
		 	BORROWERS AND GUARANTORS:
			
		 		 	 WESTLAKE CHEMICAL CORPORATION,
 a Delaware corporation

		 		 	 WESTLAKE PVC CORPORATION,
 a
Delaware corporation

		 		 	 WESTLAKE VINYLS, INC.,
 a
Delaware corporation

		 		 	 NORTH AMERICAN BRISTOL CORPORATION,
 a Delaware corporation

				
		 		 	By:	 	 /s/ Albert Chao

		 		 		 	Albert Chao
		 		 		 	President of the above Borrowers

  

 Signature Page to Sixth Amendment 

 Signature Page to that certain Sixth Amendment to Credit Agreement dated as of the date first stated above, among
Westlake Chemical Corporation and certain of its domestic subsidiaries, as Borrowers, Bank of America, N.A., in its capacity as Agent, Required Lenders, and Guarantors. 
  

			
	NORTH AMERICAN PIPE CORPORATION,
	a Delaware corporation
	 VAN BUREN PIPE CORPORATION,
 a
Delaware corporation

	 WESTECH BUILDING PRODUCTS, INC.,
 a
Delaware corporation

	 WESTECH PROFILES LIMITED,
 a Delaware
corporation

		
	By:	 	 /s/ Wayne D. Morse

		 	Wayne D. Morse
		 	President of the above Borrowers

  

 Signature Page to Sixth Amendment 

 Signature Page to that certain Sixth Amendment to Credit Agreement dated as of the date first stated above, among
Westlake Chemical Corporation and certain of its domestic subsidiaries, as Borrowers, Bank of America, N.A., in its capacity as Agent, Required Lenders, and Guarantors. 
  

							
	WESTLAKE VINYLS COMPANY LP,
	a Delaware limited partnership
		 	By:	 	GVGP, Inc., its general partner
	
	 WESTLAKE PETROCHEMICALS LP,
 a
Delaware limited partnership

		 	By:	 	Westlake Chemical Investments, Inc., its general partner
	
	 WESTLAKE POLYMERS LP,
 a
Delaware limited partnership

		 	By:	 	Westlake Chemical Investments, Inc., its general partner
	
	 WESTLAKE STYRENE LP,
 a
Delaware limited partnership

		 	By:	 	Westlake Chemical Holdings, Inc., its general partner
	
	 WPT LP,
 a Delaware limited
partnership

		 	By:	 	Westlake Chemical Holdings, Inc., its general partner
			
		 	By:	 	 /s/ Albert Chao

		 		 	Albert Chao
		 		 	President of the general partners of the above Borrowers

  

 Signature Page to Sixth Amendment 

 Signature Page to that certain Sixth Amendment to Credit Agreement dated as of the date first stated above, among
Westlake Chemical Corporation and certain of its domestic subsidiaries, as Borrowers, Bank of America, N.A., in its capacity as Agent, Required Lenders, and Guarantors. 
  

			
	GUARANTORS:
	
	GVGP, INC., a Delaware corporation
	WESTLAKE CHEMICAL HOLDINGS, INC.,
	a Delaware corporation
	WESTLAKE CHEMICAL INVESTMENTS, INC.,
	a Delaware corporation
	WESTLAKE MANAGEMENT SERVICES, INC.,
	a Delaware corporation
	WESTLAKE OLEFINS CORPORATION,
	a Delaware corporation
	WESTLAKE RESOURCES CORPORATION,
	a Delaware corporation
	WESTLAKE VINYL CORPORATION,
	a Delaware corporation
	WESTLAKE INTERNATIONAL CORPORATION,
	a Delaware corporation
	WESTLAKE NG I CORPORATION,
	a Delaware corporation
	WESTLAKE NG II CORPORATION
	a Delaware corporation
		
	By:	 	 /s/ Albert Chao

		 	Albert Chao
		 	President of the above entities

  

 Signature Page to Sixth Amendment 

 Signature Page to that certain Sixth Amendment to Credit Agreement dated as of the date first stated above, among
Westlake Chemical Corporation and certain of its domestic subsidiaries, as Borrowers, Bank of America, N.A., in its capacity as Agent, Required Lenders, and Guarantors. 
  

			
	 GEISMAR HOLDINGS, INC.,
 a Delaware
corporation

	 WESTLAKE CHEMICAL MANUFACTURING, INC.,
 a Delaware corporation

	 WESTLAKE CHEMICAL PRODUCTS, INC.,
 a
Delaware corporation

	 WESTLAKE DEVELOPMENT CORPORATION,
 a
Delaware corporation

		
	By:	 	 /s/ R. Michael Looney

		 	R. Michael Looney
		 	President of the above entities

  

 Signature Page to Sixth Amendment

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