Document:

General Continuing Guaranty dated as of April 29, 2008

 Exhibit 10.19 
 GENERAL CONTINUING GUARANTY 
 This GENERAL CONTINUING
GUARANTY (this “Guaranty”), dated as of April 29, 2008, is executed and delivered by SERVICESOURCE INTERNATIONAL INC., a Delaware corporation (“Guarantor”), in favor of WELLS FARGO FOOTHILL, INC., a
California corporation, as arranger and administrative agent for the below defined Lenders (in such capacity, together with its successors and assigns, if any, in such capacity, “Agent”), in light of the following: 

WHEREAS, ServiceSource International, LLC, a Delaware limited liability company (“Borrower”), the below defined Lenders,
and Agent are, contemporaneously herewith, entering into that certain Amended and Restated Credit Agreement of even date herewith (as amended, restated, modified, renewed or extended from time to time, the “Credit Agreement”); 

WHEREAS, Guarantor is a Subsidiary of Borrower and, as such, will benefit by virtue of the financial accommodations extended to
Borrower by the Lender Group; and 
 WHEREAS, in order to induce the Lender Group to enter into the Credit Agreement and
the other Loan Documents and to extend the loans and other financial accommodations to Borrower pursuant to the Credit Agreement, and in consideration thereof, and in consideration of any loans or other financial accommodations heretofore or
hereafter extended by the Lender Group to Borrower pursuant to the Loan Documents, Guarantor has agreed to guaranty the Guarantied Obligations. 
 NOW, THEREFORE, in consideration of the foregoing, Guarantor hereby agrees as follows: 
 1. Definitions and Construction. 
 (a) Definitions.
Capitalized terms used herein and not otherwise defined herein shall have the meanings ascribed to them in the Credit Agreement. The following terms, as used in this Guaranty, shall have the following meanings: 

“Agent” has the meaning set forth in the preamble to this Guaranty. 

“Borrower” has the meaning set forth in the recitals to this Guaranty. 

“Credit Agreement” has the meaning set forth in the recitals to this Guaranty. 

“Guarantied Obligations” means all of the Obligations now or hereafter existing under any Loan Document, whether for
principal, interest (including all interest that accrues after the commencement of any Insolvency Proceeding irrespective of whether a claim therefor is allowed in such case or proceeding), fees, expenses or otherwise, and any and all expenses
(including reasonable counsel fees and expenses) incurred by the Agent, the Lenders or the Issuing Lender (or any of them) in enforcing any rights under this Guaranty. Without limiting the generality of the foregoing, Guarantied Obligations shall
include all amounts that constitute part of the Guarantied Obligations and would be owed by the Borrower to the Agent, the Lenders or the Issuing Lender 

 
under any Loan Document but for the fact that they are unenforceable or not allowable, including due to the existence of a bankruptcy, reorganization or similar proceeding involving Borrower or
any other guarantor. 
 “Guarantor” has the meaning set forth in the preamble to this Guaranty. 

“Guaranty” has the meaning set forth in the preamble to this Guaranty. 

“Lender Group” means, individually and collectively, each of the Lenders and Agent. 

“Lenders” means, individually and collectively, each of the lenders identified on the signature pages to the Credit
Agreement, and shall include any other Person made a party to the Credit Agreement in accordance with the provisions of Section 13.1 thereof (together with their respective successors and assigns). 

“Record” means information that is inscribed on a tangible medium or which is stored in an electronic or other medium
and is retrievable in perceivable form. 
 “Voidable Transfer” has the meaning set forth in
Section 9 of this Guaranty. 
 (b) Construction. Unless the context of this Guaranty clearly requires
otherwise, references to the plural include the singular, references to the singular include the plural, the part includes the whole, the terms “includes” and “including” are not limiting, and the term “or” has, except
where otherwise indicated, the inclusive meaning represented by the phrase “and/or.” The words “hereof,” “herein,” “hereby,” “hereunder,” and other similar terms in this Guaranty refer to this
Guaranty as a whole and not to any particular provision of this Guaranty. Section, subsection, clause, schedule, and exhibit references herein are to this Guaranty unless otherwise specified. Any reference in this Guaranty to any agreement,
instrument, or document shall include all alterations, amendments, changes, extensions, modifications, renewals, replacements, substitutions, joinders, and supplements, thereto and thereof, as applicable (subject to any restrictions on such
alterations, amendments, changes, extensions, modifications, renewals, replacements, substitutions, joinders, and supplements set forth herein). Neither this Guaranty nor any uncertainty or ambiguity herein shall be construed or resolved against the
Lender Group or Borrower, whether under any rule of construction or otherwise. On the contrary, this Guaranty has been reviewed by all parties and shall be construed and interpreted according to the ordinary meaning of the words used so as to
accomplish fairly the purposes and intentions of Guarantor and Agent. Any reference herein to the satisfaction or payment in full of the Guarantied Obligations shall mean the payment in full in cash (or cash collateralization in accordance with the
terms of the Credit Agreement) of all Guarantied Obligations other than contingent indemnification Guarantied Obligations and other than any Bank Product Obligations that, at such time, are allowed by the applicable Bank Product Provider to remain
outstanding and are not required to be repaid or cash collateralized pursuant to the provisions of the Credit Agreement and the full and final termination of any commitment to extend any financial accommodations under the Credit Agreement and any
other Loan Document. Any reference herein to any Person shall be construed to include such Person’s successors and assigns. Any requirement of a writing contained herein shall be satisfied by the transmission of a Record and

  
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any Record transmitted shall constitute a representation and warranty as to the accuracy and completeness of the information contained therein. The captions and headings are for convenience of
reference only and shall not affect the construction of this Guaranty. 
 2. Guarantied Obligations. Guarantor
hereby irrevocably and unconditionally guaranties to Agent, for the benefit of the Lender Group and the Bank Product Providers, as and for its own debt, until the final and indefeasible payment in full thereof, in cash, has been made, (a) the
due and punctual payment of the Guarantied Obligations, when and as the same shall become due and payable, whether at maturity, pursuant to a mandatory prepayment requirement, by acceleration, or otherwise; it being the intent of Guarantor that the
guaranty set forth herein shall be a guaranty of payment and not a guaranty of collection; and (b) the punctual and faithful performance, keeping, observance, and fulfillment by Borrower of all of the agreements, conditions, covenants, and
obligations of Borrower contained in the Credit Agreement and under each of the other Loan Documents. 
 3. Continuing
Guaranty. This Guaranty includes Guarantied Obligations arising under successive transactions continuing, compromising, extending, increasing, modifying, releasing, or renewing the Guarantied Obligations, changing the interest rate, payment
terms, or other terms and conditions thereof, or creating new or additional Guarantied Obligations after prior Guarantied Obligations have been satisfied in whole or in part. To the maximum extent permitted by law, Guarantor hereby waives any right
to revoke this Guaranty as to future Guarantied Obligations. If such a revocation is effective notwithstanding the foregoing waiver, Guarantor acknowledges and agrees that (a) no such revocation shall be effective until written notice thereof
has been received by Agent, (b) no such revocation shall apply to any Guarantied Obligations in existence on the date of receipt by Agent of such written notice (including any subsequent continuation, extension, or renewal thereof, or change in
the interest rate, payment terms, or other terms and conditions thereof), (c) no such revocation shall apply to any Guarantied Obligations made or created after such date to the extent made or created pursuant to a legally binding commitment of
the Lender Group in existence on the date of such revocation, (d) no payment by Guarantor, Borrower, or from any other source, prior to the date of Agent’s receipt of written notice of such revocation shall reduce the maximum obligation of
Guarantor hereunder, and (e) any payment by Borrower or from any source other than Guarantor subsequent to the date of such revocation shall first be applied to that portion of the Guarantied Obligations as to which the revocation is effective
and which are not, therefore, guarantied hereunder, and to the extent so applied shall not reduce the maximum obligation of Guarantor hereunder. 
 4. Performance Under this Guaranty. In the event that Borrower fails to make any payment of any Guarantied Obligations, on or prior to the due date thereof, or if Borrower shall fail to
perform, keep, observe, or fulfill any other obligation referred to in clause (b) of Section 2 of this Guaranty in the manner provided in the Credit Agreement or any other Loan Document, Guarantor immediately shall cause, as
applicable, such payment in respect of the Guarantied Obligations to be made or such obligation to be performed, kept, observed, or fulfilled. 
 5. Primary Obligations. This Guaranty is a primary and original obligation of Guarantor, is not merely the creation of a surety relationship, and is an absolute, unconditional, and

  
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continuing guaranty of payment and performance which shall remain in full force and effect without respect to future changes in conditions. Guarantor hereby agrees that it is directly, jointly
and severally with any other guarantor of the Guarantied Obligations, liable to Agent, for the benefit of the Lender Group and the Bank Product Providers, that the obligations of Guarantor hereunder are independent of the obligations of Borrower or
any other guarantor, and that a separate action may be brought against Guarantor, whether such action is brought against Borrower or any other guarantor or whether Borrower or any other guarantor is joined in such action. Guarantor hereby agrees
that its liability hereunder shall be immediate and shall not be contingent upon the exercise or enforcement by any member of the Lender Group or any Bank Product Provider of whatever remedies they may have against Borrower or any other guarantor,
or the enforcement of any lien or realization upon any security by any member of the Lender Group or any Bank Product Provider. Guarantor hereby agrees that any release which may be given by Agent to Borrower or any other guarantor, or with respect
to any property or asset subject to a Lien, shall not release Guarantor. Guarantor consents and agrees that no member of the Lender Group nor any Bank Product Provider shall be under any obligation to marshal any property or assets of Borrower or
any other guarantor in favor of Guarantor, or against or in payment of any or all of the Guarantied Obligations. 
 6.
Waivers. 
 (a) To the fullest extent permitted by applicable law, Guarantor hereby waives: (i) notice of
acceptance hereof; (ii) notice of any loans or other financial accommodations made or extended under the Credit Agreement, or the creation or existence of any Guarantied Obligations; (iii) notice of the amount of the Guarantied
Obligations, subject, however, to Guarantor’s right to make inquiry of Agent to ascertain the amount of the Guarantied Obligations at any reasonable time; (iv) notice of any adverse change in the financial condition of Borrower or of any
other fact that might increase Guarantor’s risk hereunder; (v) notice of presentment for payment, demand, protest, and notice thereof as to any instrument among the Loan Documents; (vi) notice of any Default or Event of Default under
any of the Loan Documents; and (vii) all other notices (except if such notice is specifically required to be given to Guarantor under this Guaranty or any other Loan Documents to which Guarantor is a party) and demands to which Guarantor might
otherwise be entitled. 
 (b) To the fullest extent permitted by applicable law, Guarantor hereby waives the right by statute or
otherwise to require any member of the Lender Group or any Bank Product Provider, to institute suit against Borrower or any other guarantor or to exhaust any rights and remedies which any member of the Lender Group or any Bank Product Provider, has
or may have against Borrower or any other guarantor. In this regard, Guarantor agrees that it is bound to the payment of each and all Guarantied Obligations, whether now existing or hereafter arising, as fully as if the Guarantied Obligations were
directly owing to Agent, the Lender Group, or the Bank Product Providers, as applicable, by Guarantor. Guarantor further waives any defense arising by reason of any disability or other defense (other than the defense that the Guarantied Obligations
shall have been fully and finally performed and indefeasibly paid in full in cash, to the extent of any such payment) of Borrower or by reason of the cessation from any cause whatsoever of the liability of Borrower in respect thereof. 

  
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 (c) To the fullest extent permitted by applicable law, Guarantor hereby waives: (i) any
right to assert against any member of the Lender Group or any Bank Product Provider, any defense (legal or equitable), set-off, counterclaim, or claim which Guarantor may now or at any time hereafter have against Borrower or any other party liable
to any member of the Lender Group or any Bank Product Provider; (ii) any defense, set-off, counterclaim, or claim, of any kind or nature, arising directly or indirectly from the present or future lack of perfection, sufficiency, validity, or
enforceability of the Guarantied Obligations or any security therefor; (iii) any right or defense arising by reason of any claim or defense based upon an election of remedies by any member of the Lender Group or any Bank Product Provider
including any defense based upon an election of remedies by any member of the Lender Group; and (iv) the benefit of any statute of limitations affecting Guarantor’s liability hereunder or the enforcement thereof, and any act which shall
defer or delay the operation of any statute of limitations applicable to the Guarantied Obligations shall similarly operate to defer or delay the operation of such statute of limitations applicable to Guarantor’s liability hereunder.

 (d) Until the Guarantied Obligations have been paid in full in cash, (i) Guarantor hereby postpones and agrees not to
exercise any right of subrogation Guarantor has or may have as against Borrower with respect to the Guarantied Obligations; (ii) Guarantor hereby postpones and agrees not to exercise any right to proceed against Borrower or any other Person now
or hereafter liable on account of the Obligations for contribution, indemnity, reimbursement, or any other similar rights (irrespective of whether direct or indirect, liquidated or contingent); and (iii) Guarantor hereby postpones and agrees
not to exercise any right it may have to proceed or to seek recourse against or with respect to any property or asset of Borrower or any other Person now or hereafter liable on account of the Obligations. Notwithstanding anything to the contrary
contained in this Guaranty, Guarantor shall not exercise any rights of subrogation, contribution, indemnity, reimbursement or other similar rights against, and shall not proceed or seek recourse against or with respect to any property or asset of,
Borrower or any other guarantor (including after payment in full of the Guaranteed Obligations) if all or any portion of the Obligations have been satisfied in connection with an exercise of remedies in respect of the Stock of Borrower or such other
guarantor whether pursuant to the Security Agreement or otherwise. 
 (e) If any of the Guarantied Obligations or the
obligations of Guarantor under this Guaranty at any time are secured by a mortgage or deed of trust upon real property, any member of the Lender Group or any Bank Product Provider may elect, in its sole discretion, upon a default with respect to the
Guarantied Obligations or the obligations of Guarantor under this Guaranty, to foreclose such mortgage or deed of trust judicially or nonjudicially in any manner permitted by law, before or after enforcing this Guaranty, without diminishing or
affecting the liability of Guarantor hereunder. Guarantor understands that (a) by virtue of the operation of antideficiency law applicable to nonjudicial foreclosures, an election by any member of the Lender Group or any Bank Product Provider
to nonjudicially foreclose on such a mortgage or deed of trust probably would have the effect of impairing or destroying rights of subrogation, reimbursement, contribution, or indemnity of Guarantor against Borrower or other guarantors or sureties,
and (b) absent the waiver given by Guarantor herein, such an election would estop any member of the Lender Group and the Bank Product Providers from enforcing this Guaranty against Guarantor. Understanding the foregoing, and understanding that
Guarantor is hereby relinquishing a defense to the enforceability of this Guaranty. 

  
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Guarantor hereby waives any right to assert against any member of the Lender Group or any Bank Product Provider any defense to the enforcement of this Guaranty, whether denominated
“estoppel” or otherwise, based on or arising from an election by any member of the Lender Group or any Bank Product Provider to nonjudicially foreclose on any such mortgage or deed of trust. Guarantor understands that the effect of the
foregoing waiver may be that Guarantor may have liability hereunder for amounts with respect to which Guarantor may be left without rights of subrogation, reimbursement, contribution, or indemnity against Borrower or other guarantors or sureties.
Guarantor also agrees that the “fair market value” provisions of Section 580a of the California Code of Civil Procedure (and any similar law of any other applicable jurisdiction) shall have no applicability with respect to the
determination of Guarantor’s liability under this Guaranty. 
 (f) Without limiting the generality of any other waiver or
other provision set forth in this Guaranty, Guarantor waives all rights and defenses that Guarantor may have if all or part of the Guarantied Obligations are secured by real property. This means, among other things: 

(i) Any member of the Lender Group or any Bank Product Provider may collect from Guarantor without first foreclosing on any real or
personal property collateral that may be pledged by Guarantor, Borrower, or any other guarantor. 
 (ii) If any member of the
Lender Group or any Bank Product Provider forecloses on any real property collateral that may be pledged by Guarantor, Borrower or any other guarantor: 
 (1) The amount of the Guarantied Obligations or any obligations of any guarantor in respect thereof may be reduced only by the price for which that collateral is sold at the foreclosure sale, even if the
collateral is worth more than the sale price. 
 (2) Agent may collect from Guarantor even if any member of the Lender Group or
any Bank Product Provider, by foreclosing on the real property collateral, has destroyed any right Guarantor may have to collect from Borrower or any other Guarantor. 
 This is an unconditional and irrevocable waiver of any rights and defenses Guarantor may have if all or part of the Guarantied Obligations are secured by real property. These rights and defenses are based
upon Section 580a, 580b, 580d, or 726 of the California Code of Civil Procedure and any similar law of any other jurisdiction. 
 (g) WITHOUT LIMITING THE GENERALITY OF ANY OTHER WAIVER OR OTHER PROVISION SET FORTH IN THIS GUARANTY, GUARANTOR HEREBY WAIVES, TO THE MAXIMUM EXTENT SUCH WAIVER IS PERMITTED BY LAW, ANY AND ALL BENEFITS
OR DEFENSES ARISING DIRECTLY OR INDIRECTLY UNDER ANY ONE OR MORE OF CALIFORNIA CIVIL CODE §§ 2787, 2799, 2808, 2815, 2819, 2820, 2821, 2822, 2838, 2839, 2847, 2848, AND 2855, CALIFORNIA CODE OF CIVIL PROCEDURE §§ 580A,
580B, 580C, 580D, AND 726, AND CHAPTER 2 OF TITLE 14 OF THE CALIFORNIA CIVIL CODE OR ANY SIMILAR LAWS OF ANY OTHER APPLICABLE JURISDICTION. 

  
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 (h) WITHOUT LIMITING THE GENERALITY OF ANY OTHER WAIVER OR OTHER PROVISION SET FORTH IN THIS
GUARANTY, GUARANTOR WAIVES ALL RIGHTS AND DEFENSES ARISING OUT OF AN ELECTION OF REMEDIES BY ANY MEMBER OF THE LENDER GROUP OR ANY BANK PRODUCT PROVIDER, EVEN THOUGH SUCH ELECTION OF REMEDIES, SUCH AS A NONJUDICIAL FORECLOSURE WITH RESPECT TO
SECURITY FOR THE GUARANTIED OBLIGATIONS, HAS DESTROYED GUARANTOR’S RIGHTS OF SUBROGATION AND REIMBURSEMENT AGAINST BORROWER BY THE OPERATION OF APPLICABLE LAW INCLUDING §580D OF THE CALIFORNIA CODE OF CIVIL PROCEDURE OR ANY SIMILAR LAWS OF
ANY OTHER APPLICABLE JURISDICTION. 
 (i) Without limiting the generality of any other waiver or other provision set forth in
this Guaranty, Guarantor hereby also agrees to the following waivers: 
 (i) Agent’s right to enforce this Guaranty is
absolute and is not contingent upon the genuineness, validity or enforceability of the Guarantied Obligations or any of the Loan Documents. Guarantor waives all benefits and defenses it may have under California Civil Code Section 2810 or any
similar laws in any other applicable jurisdiction and agrees that Agent’s rights under this Guaranty shall be enforceable even if Borrower had no liability at the time of execution of the Loan Documents or the Guarantied Obligations are
unenforceable in whole or in part, or Borrower ceases to be liable with respect to all or any portion of the Guarantied Obligations. 
 (ii) Guarantor waives all benefits and defenses it may have under California Civil Code Section 2809 or any similar laws in any other applicable jurisdiction with respect to its obligations under
this Guaranty and agrees that Agent’s rights under the Loan Documents will remain enforceable even if the amount secured by the Loan Documents is larger in amount and more burdensome than that for which Borrower is responsible. The
enforceability of this Guaranty against Guarantor shall continue until all sums due under the Loan Documents have been paid in full and shall not be limited or affected in any way by any impairment or any diminution or loss of value of any security
or collateral for Borrower’s obligations under the Loan Documents, from whatever cause, the failure of any security interest in any such security or collateral or any disability or other defense of Borrower, any other guarantor of
Borrower’s obligations under any other Loan Document, any pledgor of collateral for any person’s obligations to Agent or any other person in connection with the Loan Documents. 

(iii) Guarantor waives all benefits and defenses it may have under California Civil Code §§ 2845, 2849 and 2850 or any
similar laws of any other applicable jurisdiction with respect to its obligations under this Guaranty, including the right to require Agent to (A) proceed against Borrower, any guarantor of Borrower’s obligations under any Loan Document,
any other pledgor, of collateral for any person’s obligations to Agent or any other person in connection with the Guarantied Obligations, (B) proceed against or exhaust any other security or collateral Agent may hold, or (C) pursue
any other right or remedy for Guarantor’s benefit, and agrees that Agent may exercise its right under this Guaranty without taking any action against Borrower, any other guarantor of Borrower’s obligations under the Loan Documents, any
pledgor of collateral for any person’s obligations to Agent or any other person in connection with the 

  
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Guarantied Obligations, and without proceeding against or exhausting any security or collateral Agent holds. 
 7. Releases. Guarantor consents and agrees that, without notice to or by Guarantor and without affecting or impairing the obligations of Guarantor hereunder, any member of the Lender Group
or any Bank Product Provider may, by action or inaction, compromise or settle, shorten or extend the Maturity Date or any other period of duration or the time for the payment of the Obligations, or discharge the performance of the Obligations, or
may refuse to enforce the Obligations, or otherwise elect not to enforce the Obligations, or may, by action or inaction, release all or any one or more parties to, any one or more of the terms and provisions of the Credit Agreement or any of the
other Loan Documents or may grant other indulgences to Borrower or any other guarantor in respect thereof, or may amend or modify in any manner and at any time (or from time to time) any one or more of the Obligations, the Credit Agreement or any
other Loan Document (including any increase or decrease in the principal amount of any Obligations or the interest, fees or other amounts that may accrue from time to time in respect thereof), or may, by action or inaction, release or substitute the
Borrower or any guarantor, if any, of the Guarantied Obligations, or may enforce, exchange, release, or waive, by action or inaction, any security for the Guarantied Obligations or any other guaranty of the Guarantied Obligations, or any portion
thereof. 
 8. No Election. The Lender Group and the Bank Product Providers shall have the right to seek recourse
against Guarantor to the fullest extent provided for herein and no election by any member of the Lender Group or any Bank Product Provider to proceed in one form of action or proceeding, or against any party, or on any obligation, shall constitute a
waiver of the Lender Group’s or any Bank Product Provider’s right to proceed in any other form of action or proceeding or against other parties unless Agent, on behalf of the Lender Group or the Bank Product Providers, has expressly waived
such right in writing. Specifically, but without limiting the generality of the foregoing, no action or proceeding by the Lender Group or the Bank Product Providers under any document or instrument evidencing the Guarantied Obligations shall serve
to diminish the liability of Guarantor under this Guaranty except to the extent that the Lender Group and the Bank Product Providers finally and unconditionally shall have realized indefeasible payment in full of the Guarantied Obligations by such
action or proceeding. 
 9. Revival and Reinstatement. If the incurrence or payment of the Guarantied Obligations
or the obligations of Guarantor under this Guaranty by Guarantor or the transfer by Guarantor to Agent of any property of Guarantor should for any reason subsequently be declared to be void or voidable under any state or federal law relating to
creditors’ rights, including provisions of the Bankruptcy Code relating to fraudulent conveyances, preferences, or other voidable or recoverable payments of money or transfers of property (collectively, a “Voidable Transfer”),
and if the Lender Group is required to repay or restore, in whole or in part, any such Voidable Transfer, or elects to do so upon the reasonable advice of its counsel, then, as to any such Voidable Transfer, or the amount thereof that the Lender
Group is required or elects to repay or restore, and as to all reasonable costs, expenses, and attorneys fees of the Lender Group related thereto, the liability of Guarantor automatically shall be revived, reinstated, and restored and shall exist as
though such Voidable Transfer had never been made. 

  
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 10. Financial Condition of Borrower. Guarantor represents and warrants to the
Lender Group and the Bank Product Providers that it is currently informed of the financial condition of Borrower and of all other circumstances which a diligent inquiry would reveal and which bear upon the risk of nonpayment of the Guarantied
Obligations. Guarantor further represents and warrants to the Lender Group and the Bank Product Providers that it has read and understands the terms and conditions of the Credit Agreement and each other Loan Document. Guarantor hereby covenants that
it will continue to keep itself informed of Borrower’s financial condition, the financial condition of other guarantors, if any, and of all other circumstances which bear upon the risk of nonpayment or nonperformance of the Guarantied
Obligations. 
 11. Payments; Application. All payments to be made hereunder by Guarantor shall be made in
Dollars, in immediately available funds, and without deduction (whether for taxes or otherwise) or offset and shall be applied to the Guarantied Obligations in accordance with the terms of the Credit Agreement. 

12. Attorneys Fees and Costs. Guarantor agrees to pay, on demand, all attorneys fees and all other costs and expenses which
may be incurred by Agent or the Lender Group in connection with the enforcement of this Guaranty or in any way arising out of, or consequential to, the protection, assertion, or enforcement of the Guarantied Obligations (or any security therefor),
irrespective of whether suit is brought. 
 13. Notices. All notices and other communications hereunder to Agent
shall be in writing and shall be mailed, sent, or delivered in accordance Section 11 of the Credit Agreement. All notices and other communications hereunder to Guarantor shall be in writing and shall be mailed, sent, or delivered in care of
Borrower in accordance with Section 11 of the Credit Agreement. 
 14. Cumulative Remedies. No remedy under
this Guaranty, under the Credit Agreement, or any other Loan Document is intended to be exclusive of any other remedy, but each and every remedy shall be cumulative and in addition to any and every other remedy given under this Guaranty, under the
Credit Agreement, or any other Loan Document, and those provided by law. No delay or omission by the Lender Group or Agent on behalf thereof to exercise any right under this Guaranty shall impair any such right nor be construed to be a waiver
thereof. No failure on the part of the Lender Group or Agent on behalf thereof to exercise, and no delay in exercising, any right under this Guaranty shall operate as a waiver thereof; nor shall any single or partial exercise of any right under this
Guaranty preclude any other or further exercise thereof or the exercise of any other right. 
 15. Severability of
Provisions. Each provision of this Guaranty shall be severable from every other provision of this Guaranty for the purpose of determining the legal enforceability of any specific provision. 

16. Entire Agreement; Amendments. This Guaranty constitutes the entire agreement between Guarantor and the Lender Group
pertaining to the subject matter contained herein. This Guaranty may not be altered, amended, or modified, nor may any provision hereof be waived or 

  
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noncompliance therewith consented to, except by means of a writing executed by Guarantor and Agent, on behalf of the Lender Group. Any such alteration, amendment, modification, waiver, or consent
shall be effective only to the extent specified therein and for the specific purpose for which given. No course of dealing and no delay or waiver of any right or default under this Guaranty shall be deemed a waiver of any other, similar or
dissimilar, right or default or otherwise prejudice the rights and remedies hereunder. 
 17. Successors and
Assigns. This Guaranty shall be binding upon Guarantor and its successors and assigns and shall inure to the benefit of the successors and assigns of the Lender Group and the Bank Product Providers; provided, however, Guarantor
shall not assign this Guaranty or delegate any of its duties hereunder without Agent’s prior written consent and any unconsented to assignment shall be absolutely null and void. In the event of any assignment, participation, or other transfer
of rights by the Lender Group or the Bank Product Providers, the rights and benefits herein conferred upon the Lender Group and the Bank Product Providers shall automatically extend to and be vested in such assignee or other transferee. 

18. No Third Party Beneficiary. This Guaranty is solely for the benefit of each member of the Lender Group, each Bank
Product Provider, and each of their successors and assigns and may not be relied on by any other Person. 
 19. CHOICE OF
LAW AND VENUE; JURY TRIAL WAIVER; JUDICIAL REFERENCE. 
 (a) THE VALIDITY OF THIS GUARANTY, THE CONSTRUCTION,
INTERPRETATION, AND ENFORCEMENT HEREOF, AND THE RIGHTS OF THE PARTIES HERETO WITH RESPECT TO ALL MATTERS ARISING HEREUNDER OR RELATED HERETO SHALL BE DETERMINED UNDER, GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF
CALIFORNIA. 
 (b) THE PARTIES AGREE THAT ALL ACTIONS OR PROCEEDINGS ARISING IN CONNECTION WITH THIS GUARANTY SHALL BE
TRIED AND LITIGATED ONLY IN THE STATE AND, TO THE EXTENT PERMITTED BY APPLICABLE LAW, FEDERAL COURTS LOCATED IN THE COUNTY OF LOS ANGELES, STATE OF CALIFORNIA, PROVIDED, HOWEVER, THAT ANY SUIT SEEKING ENFORCEMENT AGAINST ANY COLLATERAL OR OTHER
PROPERTY MAY BE BROUGHT, AT AGENT’S OPTION, IN THE COURTS OF ANY JURISDICTION WHERE AGENT ELECTS TO BRING SUCH ACTION OR WHERE SUCH COLLATERAL OR OTHER PROPERTY MAY BE FOUND. GUARANTOR AND EACH MEMBER OF THE LENDER GROUP WAIVE, TO THE EXTENT
PERMITTED UNDER APPLICABLE LAW, ANY RIGHT EACH MAY HAVE TO ASSERT THE DOCTRINE OF FORUM NON CONVENIENS OR TO OBJECT TO VENUE TO THE EXTENT ANY PROCEEDING IS BROUGHT IN ACCORDANCE WITH THIS SECTION 19. 

(c) GUARANTOR AND EACH MEMBER OF THE LENDER GROUP HEREBY WAIVE, TO THE EXTENT PERMITTED BY APPLICABLE LAW, THEIR

  
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RESPECTIVE RIGHTS TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING OUT OF THIS GUARANTY OR ANY OF THE TRANSACTIONS CONTEMPLATED HEREIN, INCLUDING CONTRACT CLAIMS, TORT
CLAIMS, BREACH OF DUTY CLAIMS, AND ALL OTHER COMMON LAW OR STATUTORY CLAIMS. GUARANTOR AND EACH MEMBER OF THE LENDER GROUP REPRESENT THAT EACH HAS REVIEWED THIS WAIVER AND EACH KNOWINGLY AND VOLUNTARILY WAIVES ITS JURY TRIAL RIGHTS FOLLOWING
CONSULTATION WITH LEGAL COUNSEL. IN THE EVENT OF LITIGATION, A COPY OF THIS SECTION MAY BE FILED AS A WRITTEN CONSENT TO A TRIAL BY THE COURT. 
 (d) GUARANTOR AND EACH MEMBER OF THE LENDER GROUP PREFER THAT ANY DISPUTE BETWEEN OR AMONG THEM BE RESOLVED IN LITIGATION SUBJECT TO A JURY TRIAL WAIVER AS SET FORTH IN SECTION 19(c). IF,
HOWEVER, UNDER THE THEN APPLICABLE LAW OF THE JURISDICTION IN WHICH A PARTY SEEKS TO COMMENCE ANY SUCH LITIGATION, A PRE-DISPUTE JURY TRIAL WAIVER OF THE TYPE PROVIDED FOR IN SECTION 19(c) IS UNENFORCEABLE IN LITIGATION TO RESOLVE ANY
DISPUTE, CLAIM, CAUSE OF ACTION OR CONTROVERSY UNDER THIS GUARANTY (EACH, A “CLAIM”), THEN, UPON THE WRITTEN REQUEST OF SUCH PARTY, SUCH CLAIM, INCLUDING ANY AND ALL QUESTIONS OF LAW OR FACT RELATING THERETO, SHALL BE DETERMINED
EXCLUSIVELY BY A JUDICIAL REFERENCE PROCEEDING. EXCEPT AS OTHERWISE PROVIDED IN SECTION 19(b), VENUE FOR ANY SUCH REFERENCE PROCEEDING SHALL BE IN THE STATE OR FEDERAL COURT IN THE COUNTY OR DISTRICT WHERE VENUE IS APPROPRIATE UNDER
APPLICABLE LAW (THE “COURT”). THE PARTIES SHALL SELECT A SINGLE NEUTRAL REFEREE, WHO SHALL BE A RETIRED STATE OR FEDERAL JUDGE. IF THE PARTIES CANNOT AGREE UPON A REFEREE, THE COURT SHALL APPOINT THE REFEREE. THE REFEREE SHALL REPORT A
STATEMENT OF DECISION TO THE COURT. NOTHING IN THIS PARAGRAPH SHALL LIMIT THE RIGHT OF ANY PARTY AT ANY TIME TO EXERCISE SELF-HELP REMEDIES, FORECLOSE AGAINST COLLATERAL OR OBTAIN PROVISIONAL REMEDIES (INCLUDING, WITHOUT LIMITATION, CLAIM AND
DELIVERY, INJUNCTIVE RELIEF, ATTACHMENT OR THE APPOINTMENT OF A RECEIVER). THE PARTIES SHALL BEAR THE FEES AND EXPENSES OF THE REFEREE EQUALLY UNLESS THE REFEREE ORDERS OTHERWISE. THE REFEREE ALSO SHALL DETERMINE ALL ISSUES RELATING TO THE
APPLICABILITY, INTERPRETATION, AND ENFORCEABILITY OF THIS SECTION 19(d). THE PARTIES ACKNOWLEDGE THAT ANY CLAIM DETERMINED BY REFERENCE PURSUANT TO THIS SECTION 19(d) SHALL NOT BE ADJUDICATED BY A JURY. 

20. Counterparts; Electronic Execution. This Guaranty may be executed in any number of counterparts and by different
parties on separate counterparts, each of which, when executed and delivered, shall be deemed to be an original, and all of which, when taken together, shall constitute but one and the same Guaranty. Delivery of an executed counterpart of this

  
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Guaranty by telefacsimile or other electronic method of transmission shall be equally as effective as delivery of an original executed counterpart of this Guaranty. Any party delivering an
executed counterpart of this Guaranty by telefacsimile or other electronic method of transmission also shall deliver an original executed counterpart of this Guaranty but the failure to deliver an original executed counterpart shall not affect the
validity, enforceability, and binding effect of this Guaranty. 
 21. Agreement to be Bound. Guarantor hereby
agrees to be bound by each and all of the terms and provisions of the Credit Agreement applicable to Guarantor. Without limiting the generality of the foregoing, by its execution and delivery of this Guaranty, Guarantor hereby: (a) makes to the
Lender Group each of the representations and warranties set forth in the Credit Agreement applicable to Guarantor fully as though Guarantor were a party thereto, and such representations and warranties are incorporated herein by this reference,
mutatis mutandis; and (b) agrees and covenants (i) to do each of the things set forth in the Credit Agreement that Borrower agrees and covenants to cause Guarantor to do, and (ii) to not do each of the things set forth in the Credit
Agreement that Borrower agrees and covenants to cause Guarantor not to do, in each case, fully as though Guarantor was a party thereto, and such agreements and covenants are incorporated herein by this reference, mutatis mutandis. 

[Signature page to follow] 

  
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 IN WITNESS WHEREOF, the undersigned has executed and delivered this Guaranty as of
the date first written above. 
  

			
	 SERVICESOURCE INTERNATIONAL INC.,

	a Delaware corporation
		
	By:	 	 /s/ John Adams

	Title:	 	CFO

  
 S-1Waiver dated as of March 19, 2010

 Exhibit 10.20 
 WAIVER 
 This WAIVER (this
“Waiver”) is made this 19th day of
March 2010, by and among SERVICESOURCE INTERNATIONAL, LLC, a Delaware limited liability company (“Borrower”), WELLS FARGO CAPITAL FINANCE, INC. (formerly known as Wells Fargo Foothill, Inc.), as administrative agent
(“Agent”), and the undersigned parties constituting all the Lenders party, as of the date hereof, to that certain Amended and Restated Credit Agreement dated April 29, 2008 by and among Borrower, Agent and the Lenders (as amended,
restated, extended, renewed, replaced or otherwise modified from time to time, the “Credit Agreement”; all capitalized terms used herein shall have meanings defined for such terms in the Credit Agreement unless otherwise defined herein).

 WITNESSETH: 
 WHEREAS, pursuant to Section 2.4(c)(iv) of the Credit Agreement, Borrower is required to prepay the Obligations in an amount equal to 25% of its Excess Cash Flow for its fiscal year ended on
December 31, 2009 (the “2009 Fiscal Year”); 
 WHEREAS, Borrower has requested that the Lenders waive the
Excess Cash Flow prepayment requirement for the 2009 Fiscal Year and the Lenders are willing to provide such a waiver, as set forth herein. 
 NOW, THEREFORE, in consideration of the premises and the agreements herein contained, the parties hereto agree as follows: 

 

	 	1.	The Lenders hereby waive the requirement under Section 2.4(c)(iv) of the Credit Agreement that Borrower prepay the Obligations in an amount equal to 25% of its
Excess Cash Flow for the 2009 Fiscal Year and acknowledge that Borrower’s failure to make such prepayment shall not cause an Event of Default under the Credit Agreement. 

 

	 	2.	Borrower shall cause ServiceSource Inc. to execute the Acknowledgement by Guarantor attached hereto as Exhibit “A”. 

 

	 	3.	The undersigned Lenders hereby constitute all Lenders, as such term is defined under the Credit Agreement, and each Lender hereby acknowledges that this Waiver
constitutes its agreement to the terms of this Waiver. 

  

	 	4.	This Waiver may be executed in two or more counterparts, each of which shall be deemed an original, but all of which together shall constitute one instrument.

  

	 	5.	This Waiver shall be governed by, and construed in accordance with, the laws of the State of California. 

  
 -1-

	 	6.	Borrower confirms that each Loan Document executed by it shall continue in full force and effect and agrees that it shall continue to be obligated under each such Loan
Document in accordance with the terms thereof, except as modified by the terms of this Waiver. This Waiver will not be construed to waive any of the rights of Agent or any Lender under the Credit Agreement or any other Loan Document, except as
specifically set forth in Section 1 above. 

 IN WITNESS WHEREOF, the parties hereto have caused this
Waiver to be duly executed and delivered by their respective officers thereunto duly authorized as of the date first written above, 
  

			
	SERVICESOURCE INTERNATIONAL, LLC, as Borrower
		
	 By: 
	 	 /s/ Paul D. Warenski

	 Name:
	 	Paul D. Warenski
	 Title: 
	 	 SVP & General Counsel

  
 -2-

 
			
	WELLS FARGO CAPITAL FINANCE, INC., as Agent and as a Lender
		
	By: 	 	 /s/ Michael Ganann

	Name:	 	Michael Ganann
	Title: 	 	Vice President
	
	COMERICA BANK, as a Lender
		
	By: 	 	 /s/ K. Crosslin

	Name:	 	Kim Crosslin
	Title: 	 	V.P.
	
	KEYBANK NATIONAL ASSOCIATION, as a Lender
		
	By: 	 	 /s/ Raed Y. Alfayoumi

	Name:	 	Raed Y. Alfayoumi
	Title :	 	Vice President

  
 -3-

 Exhibit “A” 

ACKNOWLEDGEMENT BY GUARANTOR 
 Dated as of March 19, 2010 
 In order to induce the Lender Group to execute
the foregoing Waiver (the “Waiver”), with respect to that certain Amended and Restated Credit Agreement (as amended, restated, extended, renewed, replaced or otherwise modified from time to time, the “Credit Agreement”), dated as
of April 29, 2008, among ServiceSource International, LLC, the Lenders and Wells Fargo Capital Finance, Inc., as administrative agent for the Lenders, the undersigned hereby represents, warrants and agrees that the undersigned has reviewed and
approved the Waiver and that nothing contained therein shall diminish, alter, amend or otherwise affect the undersigned’s obligations under the Guaranty or any other Loan Document executed by it in connection with the Credit Agreement. The
undersigned further confirms that each Loan Document executed by it shall continue in full force and effect and agrees that it shall continue to be obligated under each such Loan Document in accordance with the terms thereof. The undersigned further
confirms that it has no defense, counterclaim or offset right whatsoever with respect to its obligations under the Loan Documents. Unless otherwise defined, capitalized terms set forth in this Acknowledgment by Guarantor shall have the meaning
defined for such term in the Credit Agreement. 
  

			
	SERVICESOURCE INC.
		
	By: 	 	 /s/ Paul D. Warenski

	Name:	 	Paul D. Warenski
	Title: 	 	SVP & General Counsel

  
 -4-

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