Document:

Exhibit 10.17  

STOCKHOLDERS' AGREEMENT  

        This Stockholders' Agreement (the "Agreement") is made and entered into as of August 26, 2005 by and among
Ron and Marriette Woestemeyer (together, the "Woestemeyers"), Joetta W. Moulden as trustee of the Woestemeyer 1999 Gift Trust, Albert Winemiller, the
Albert Winemiller Limited Partnership and Charles H. Murphy (on behalf of himself and the Murphy family stockholders). 

        WHEREAS,
the parties wish to define certain voting and control provisions with respect to themselves as stockholders of PROS Holdings, Inc.
("PROS" or the "Company"). 

AGREEMENT  

        NOW, THEREFORE, in furtherance of the foregoing and for other good and valuable consideration, the receipt and adequacy of which is hereby acknowledged, the
parties agree as follows: 

        1.    Condition Precedent.    The rights and obligations of the parties under this Agreement shall be conditioned
precedent upon the earlier to occur of the following: 

        (a)   the
issuance of shares of voting capital stock of PROS representing at least ten percent (10%) of the total outstanding voting capital stock of the Company; 

        (b)   an
Investor Transfer; or 

        (c)   the
written consent, separate from this Agreement, of each of the Woestemeyers, Mr. Murphy and Mr. Winemiller. 

        2.    Voting.    Each party agrees to attend and vote (or cause the vote of) its shares of PROS voting securities at
each annual or special meeting of stockholders and to give or withhold its written consent, in each case in accordance with the unanimous vote (or consent) of the Woestemeyers, Mr. Winemiller
and Mr. Murphy. If the Woestemeyers, Mr. Winemiller and Mr. Murphy cannot unanimously agree to vote their shares (or provide consent) with respect to any matter described below,
then no party shall vote (or cause the vote of) its shares or provide consent with respect thereto. 

        (a)   Any
amendment of the Company's certificate of incorporation or bylaws, including any increase in the authorized shares of capital stock or designation of a new class or
series of capital stock; 

        (b)   Any
increase or change in the size or composition of the Board of Directors (the "Board"); 

        (c)   Any
increase in the number of shares reserved for issuance under the Company's existing option plans or the creation of any new equity incentive or benefit plan; 

        (d)   Any
merger, consolidation or reorganization of the Company; 

        (e)   Any
sale of a material portion of the Company's assets, or the exclusive licensing of the same, other than in the ordinary course of business; 

        (f)    Any
liquidation or dissolution of the Company; 

        (g)   Any
change or reorganization of the Company into any other legal form; 

        (h)   Any
entry into any settlement agreement or confession of a material judgment that could result in a material adverse effect on the Company; 

        (i)    Any
declaration or payment of a dividend on any class or series of stock; 

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        (j)    Any
incurrence of indebtedness for borrowed money in excess of $3,000,000; and 

        (k)   Any
removal (other than for cause) of any of the Woestemeyers, Mr. Winemiller or Mr. Murphy (if applicable) as director. 

        3.    Board of Directors.    

        (a)   Prior
to the transfer, sale or other disposition of all shares of capital stock held by TA Associates and JMI Equity Fund, L.P., and in each case funds affiliated
therewith (an "Investor Transfer"), each of the parties shall vote, or cause the vote of, all shares of voting securities of the Company over which such
party has voting control, and will take all other necessary or desirable actions within such party's control (whether in such party's capacity as a stockholder, director or officer of the Company or
otherwise) in order to ensure that (i) the size of the Board shall be no more than five (5) unless agreed to by each of the Woestemeyers, Mr. Winemiller and Mr. Murphy and
(ii) each of the Woestemeyers and Mr. Winemiller are elected to the Board. 

        (b)   Following
an Investor Transfer, each of the parties shall vote, or cause the vote of, all shares of voting securities of the Company over which such party has voting
control, and will take all other necessary or desirable actions within such party's control (whether in such party's capacity as a stockholder, director or officer of the Company or otherwise) in
order to ensure that (i) the size of the Board shall be no more than four (4) unless agreed to by each of the Woestemeyers, Mr. Winemiller and Mr. Murphy and
(ii) each of the Woestemeyers, Mr. Winemiller and Mr. Murphy are elected to the Board. 

        (c)   In
the event either of the Woestemeyers ceases to be a director for any reason, each of the parties agrees to vote its shares (or provide consent) for a successor
director designated by the Woestemeyers. 

        4.    Grant of Proxy.    Should the provisions of this Agreement be construed to constitute the granting of proxies,
such proxies shall be deemed coupled with an interest and irrevocable for the term of this Agreement. 

        5.    Application of Agreement to After-Acquired-Shares.    All of the provisions of this Agreement shall apply to all
voting securities held by the parties, whether issued before or after the date of this Agreement, and all securities issued as a replacement for the shares or with respect to the shares as a result of
any stock dividend, stock split or other similar recapitalization. 

        6.    No Heightened Duties.    Each party hereby acknowledges and agrees that no fiduciary duty, duty of care, duty of
loyalty or other heightened duty shall be created or imposed upon any party to any other party, by reason of this Agreement and/or any right or obligation hereunder. 

        7.    Term; Survival.    The initial term of this Agreement will be four (4) years. The term will automatically
extend for successive one (1)-year periods unless any party provides notice of termination within ninety (90) days of the end of the initial or any successive period.
Notwithstanding the foregoing, this Agreement shall terminate and the obligations of the parties hereto shall cease upon the earlier to occur of: 

          (i)  the
voluntary commencement of bankruptcy or insolvency proceedings; 

         (ii)  the
closing of the Company's initial underwritten public offering of its securities pursuant to a registration statement under the Securities Act of 1933, as amended; 

        (iii)  the
sale of all or substantially all the assets or business of the Company or the closing of a merger, consolidation or any other transaction or series of related
transactions as a result of which the holders of capital stock immediately prior to such transaction(s) cease to hold at least thirty percent (30%) of the voting power of the surviving entity; 

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        (iv)  the
written consent of each the Woestemeyers, Mr. Winemiller and Mr. Murphy; 

         (v)  with
respect to Mr. Winemiller or Mr. Murphy, upon the death of such party or the termination of all services of such party to the Company, whether as a
director, officer or employee. 

        8.    Survival.    The provisions of Sections
15 - 21 shall survive any termination of this Agreement. 

        9.    Further Instruments and Actions.    The parties agree to execute such further instruments and to take such
further action as may reasonably be necessary to carry out the intent of this Agreement. Each party hereto agrees to cooperate affirmatively with all other parties hereto, to the extent reasonably
requested by such parties, to enforce rights and obligations herein provided. 

        10.    Specific Performance.    The rights of the parties under this Agreement are unique and, accordingly, the
parties shall have the right, in addition to such other remedies as may be available to any of them at law or in equity, to enforce their rights hereunder by actions for specific performance in
addition to any other legal or equitable remedies they might have to the extent permitted by law. 

        11.    Entire Agreement.    This Agreement contains the entire understanding of the parties hereto with respect to the
subject matter hereof, supersedes all other agreements between or among any of the parties with respect to the subject matter hereof. 

        12.    Amendments and Waivers.    Any term of this Agreement may be amended and the observance of any term of this
Agreement may be waived (either generally or in a particular instance and either retroactively or prospectively), only with the written consent of each of the Woestemeyers, Mr. Winemiller and
Mr. Murphy. Any amendment or waiver effected in accordance with this paragraph shall be binding upon each party and their respective successors and assigns. 

        13.    Assignment; Successors and Assigns.    This Agreement shall be binding upon and shall inure to the benefit of
the parties hereto and their respective heirs, executors, legal representatives, successors and permitted transferees, except as may be expressly provided otherwise herein. 

        14.    Counterparts.    This Agreement may be executed in two (2) or more counterparts, each of which shall be
deemed an original, but all of which together shall constitute one (1) and the same instrument. 

        15.    Notices.    Any notice required or permitted by an provision of this Agreement shall be given in writing and
shall be delivered personally or by courier, or by registered or certified mail, postage prepaid, addressed (i) if to a party: to such party's address as set forth on the signature page
attached hereto or such other address as such party may designate in writing from time to time; and (ii) in the case of any permitted transferee of a party to this Agreement or its transferee,
to such transferee at its address as designated in writing by such transferee to the Company from time to time. Notices that are mailed shall be deemed received five (5) days after deposit in
the United States mail. Notices sent by courier or overnight delivery shall be deemed received two (2) days after they have been so sent. 

        16.    Separability.    In case any one or more of the provisions contained in this Agreement shall for any reason be
held to be invalid, illegal or unenforceable in any respect, such invalidity, illegality or unenforceability shall not affect any other provision of this Agreement and such invalid, illegal and
unenforceable provision shall be reformed and construed so that it will be valid, legal, and enforceable to the maximum extent permitted by law. 

        17.    Arbitration.    Each party agrees to binding arbitration of all disputes arising after the date of this
Agreement arising out of or related to this Agreement, and judgment on any arbitration 

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award
may be entered in any court having jurisdiction. If the parties to this Agreement cannot agree to an arbitrator or the arbitration procedure, then the parties agree that they will request the
then presiding Administrative District Judge in Harris County, Texas to appoint an arbitrator from JAMS and that they will abide by the procedure selected by the arbitrator appointed. The arbitrator
shall award to the prevailing party, if any, as determined by the arbitrator, all of its costs and fees, including attorneys' fees. The arbitrator will have no authority to award punitive,
consequential, or other damages not measured by the prevailing party's actual damages. A demand for arbitration must be made within six months of the party's becoming aware of the accrual of the cause
of action. The award shall be made within nine months of the filing of the demand for arbitration; this time limit may be extended by the arbitrator if necessary. 

        18.    Section Headings.    The headings contained in this Agreement are for reference purposes only and shall not in
any way affect the meaning or interpretation of this Agreement. 

        19.    Governing Law.    This Agreement shall be governed by and construed and enforced in accordance with the laws of
the State of Texas, without regard to conflicts of laws. 

        20.    Representations.    Each party represents and warrants that such party has the full right and authority to
enter into this Agreement, and that the person executing this Agreement on any entity's behalf has the full right and authority to fully commit and bind such entity. 

        21.    Confidentiality.    The terms and conditions of this Agreement, including its existence, shall be confidential
information and shall not be disclosed to any third party without the consent of the other parties, except that the parties may disclose the terms and conditions described in this Agreement to their
respective officers, directors, partners, employees, attorneys, accountants and other advisers, provided that such persons agree to the confidentiality restrictions contained herein. If any party
determines that it is required by law to disclose information regarding this Agreement, it shall, a reasonable time before making any such disclosure or filing, consult with each other party regarding
such disclosure or filing and seek confidential treatment for such portions of the disclosure or filing as may be reasonably requested by the other party. 

        22.    Legal Counsel.    All of the parties acknowledge and agree that DLA Piper Rudnick Gray
Cary US LLP and its attorneys (collectively "DLA Piper") served as legal counsel only to, and represented only, the Company in connection with the negotiation and preparation of this Agreement and the
related transactions, and DLA Piper did not and does not serve as legal counsel to, nor represent, any individual party to this Agreement (or any other party's owners, agents or representatives) with
respect to any matters arising out of, relating to or resulting from this Agreement or any related transactions.

Signature Page Follows.

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        IN
WITNESS WHEREOF, the parties have entered into this non-binding summary of terms as of the date first above written. 

	ALBERT WINEMILLER	 	ALBERT WINEMILLER LIMITED PARTNERSHIP
	

Albert Winemiller	
 	

By:	

  

	

 	

 	
 	
Name:	

  

	

Address:	

  
  
	
 	

Title:	

  

	

 	

 	
 	

Address:	

  
  

	

CHARLES H. MURPHY	
 	

RON WOESTEMEYER
	

Charles H. Murphy	
 	

Ron Woestemeyer
	

Address:	

  
	
 	

Address:	

  

	

    	

 	
 	

 	

 
	

MARIETTE WOESTEMEYER	
 	

WOESTEMEYER 1999 GIFT TRUST
	

Marriette Woestemeyer	
 	

Joetta W. Moulden, Trustee
	

Address:	

  
	
 	

Address:	

  

	

    	

 	
 	

 	

 

Signature Page to Stockholders Agreement

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Exhibit 10.18  

VOTING AGREEMENT  

        This Voting Agreement (the "Agreement") is made and entered into as of March 26, 2007, by and among
TA/Advent VIII, L.P., Advent Atlantic and Pacific III L.P., TA Venture Investors L.P. and TA Executives Fund LLC (collectively,
"TA Associates), JMI Equity Fund, III, L.P. ("JMI;" together with TA Associates, the
"Equity Sponsors"), and Ronald and Mariette Woestemeyer (the "Woestemeyers"), all of whom are holders of
Common Stock, par value $0.001 per share (the "Common Stock"), of PROS Holdings, Inc., a Delaware corporation (the
"Company"). The Company, TA Associates, JMI, and the Woestemeyers are individually referred to herein as a
"Party" and are collectively referred to herein as the "Parties." The Company's Board of Directors is
referred to herein as the "Board." 

RECITALS  

        WHEREAS, the Equity Sponsors hold substantially all of the outstanding shares of the Company's redeemable preferred stock, par value $0.001 per share (the
"Redeemable Stock") and hold a significant number of outstanding shares of the Company's Common Stock; 

        WHEREAS,
pursuant to the terms of the Company's certificate of incorporation, the holders of the Redeemable Stock are entitled to elect two (2) directors to the Board so long as
the Redeemable Stock is outstanding; 

        WHEREAS,
the Company and the holders of the Redeemable Stock have agreed to the redemption of all the Redeemable Stock; 

        WHEREAS,
as a condition to the redemption of all of the Redeemable Stock, the Equity Sponsors desire the right, in their capacity as holders of Common Stock, to designate two
(2) directors to the Board; and 

        WHEREAS,
the Woestemeyers hold or control 6,149,720 shares of Common Stock and desire to induce the holders of Redeemable Stock to agree to the redemption of Redeemable Stock by agreeing
to vote their shares of capital stock in favor of the election of directors designated by the Equity Sponsors. 

AGREEMENT  

        NOW, THEREFORE, in consideration of the foregoing premises and certain other good and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the Parties agree as follows: 

        1.    Agreement to Vote.    Each of the Woestemeyers, as a holder of Common Stock, hereby agrees on behalf of himself
or herself and any transferee or assignee of any such shares of Common Stock, to hold all of the shares of Common Stock registered in his or her name (and any securities of the Company issued with
respect to, upon conversion of, or in exchange or substitution of such Common Stock, and any other voting securities of the Company subsequently acquired by such Party) (hereinafter collectively
referred to as the "Founder Shares") subject to, and to vote the Founder Shares at regular or special meetings of stockholders (or by written consent)
in accordance with, the provisions of this Agreement. 

        2.    Election of Directors.    In any election of directors of the Company to elect directors to the Board, each of
the Woestemeyers shall vote at any regular or special meeting of stockholders (or by written consent) all shares of Common Stock then owned by him or her (or as to which he or she then has voting
power) or take any other action necessary to elect two (2) directors (the "Nominated Directors") nominated by the Equity Sponsors holding a
majority of the outstanding shares of Common Stock held by all Equity Sponsors (the "Majority-in-Interest Equity Sponsors"),
which Nominated Directors shall initially be Kurt Jaggers and Harry Gruner. 

 

        3.    Removal.    Any director of the Company may be removed from the Board in the manner allowed by law and the
Company's Certificate of Incorporation and Bylaws, as amended, but with respect to a director designated pursuant to Section 2 above, only upon
the vote or written consent of the Majority-in-Interest Equity Sponsors. Each of the Woestemeyers shall vote at any regular or special meeting of stockholders (or by written
consent) all shares of Common Stock then owned by him or her (or as to which he or she then has voting power) or take any other action necessary for the removal of any Nominated Director upon the
request of the
Majority-in-Interest Equity Sponsors then entitled to nominate such Nominated Director as set forth in Section 2 above, and for the election to the Board of Directors of
a substitute Nominated Director designated by such Majority-in-Interest Equity Sponsors in accordance with the provisions hereof. Each of the Woestemeyers further agrees to
vote all shares of Common Stock then owned by him or her (or as to which he or she then has voting power) in such manner or take any other action as shall be necessary or appropriate to ensure that
any vacancy of a Nominated Director's seat on the Board of Directors occurring for any reason shall be filled in accordance with the provisions of Section 2. 

        4.    Specific Enforcement.    It is agreed and understood that monetary damages would not adequately compensate an
injured Party for the breach of this Agreement by any other Party, that this Agreement shall be specifically enforceable, and that any breach or threatened breach of this Agreement shall be the proper
subject of a temporary or permanent injunction or restraining order. Further, each Party hereto waives any claim or defense that there is an adequate remedy at law for such breach or threatened
breach. 

        5.    Captions.    The captions, headings and arrangements used in this Agreement are for convenience only and do not
in any way limit or amplify the terms and provisions hereof. 

        6.    Notices.    All notices and other communications given or made pursuant hereto shall be in writing and shall be
deemed effectively given: (i) upon personal delivery to the party to be notified, (ii) when sent by confirmed electronic mail or facsimile if sent during normal business hours of the
recipient; if not, then on the next business day, (iii) five (5) days after having been sent by registered or certified mail, return receipt requested, postage prepaid, or
(iv) one (1) day after deposit with a nationally recognized overnight courier, specifying next day delivery, with written verification of receipt. All communications shall be sent to the
respective parties at the addresses set forth on the signature pages attached hereto (or at such other addresses as shall be specified by notice given in accordance with this  Section 6).

        7.    Term.    This Agreement shall terminate and be of no further force or effect upon (a) the consummation of
the Company's sale of its Common Stock or other securities pursuant to the Qualified Public Offering, as defined in the Company's Certificate of Incorporation dated August 29, 2002 (the
"Charter"), or (b) the consummation of a Liquidation Event or Extraordinary Transaction, as that term is defined in the Company's Charter. 

        8.    Manner of Voting.    The voting of shares pursuant to this Agreement may be effected in person, by proxy, by
written consent or in any other manner permitted by applicable law. 

        9.    Amendments and Waivers.    Any term hereof may be amended and the observance of any term hereof may be waived
(either generally or in a particular instance and either retroactively or prospectively) only with the written consent of (i) the Majority-in-Interest Equity Sponsors
and (ii) the Woestemeyers. Any amendment or waiver so effected shall be binding upon all the
Parties hereto. Any amendment or waiver not effected in accordance with this Section 9 shall be null and void. 

        10.    Stock Splits, Stock Dividends, etc.    In the event of any issuance of shares of the Company's voting
securities hereafter to any of the Parties hereto (including, without limitation, in 

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connection
with any stock split, stock dividend, recapitalization, reorganization or the like), such shares shall become subject to this Agreement. 

        11.    Severability.    Whenever possible, each provision of this Agreement shall be interpreted in such manner as to
be effective and valid under applicable law, but if any provision of this Agreement shall be held to be prohibited by or invalid under applicable law, such provision shall be ineffective only to the
extent of such prohibition or invalidity, without invalidating the remainder of such provision or the remaining provisions of this Agreement. 

        12.    Binding Effect.    In addition to any restriction on transfer that may be imposed by any other agreement by
which any Party hereto may be bound, each transferee or assignee of any shares of Common Stock of the Woestemeyers subject to this Agreement shall continue to be subject to the terms hereof, and, as a
condition precedent to the Company recognizing such transfer, each transferee or assignee shall agree in writing to be subject to each of the terms of this Agreement by executing and delivering an
Adoption Agreement substantially in the form attached hereto as Exhibit A. This Agreement shall be binding upon the Parties, their respective heirs, successors, transferees and assigns and to
such additional individuals or entities that may become stockholders of the Company and that desire to become Parties hereto. Upon the execution and delivery of an Adoption Agreement, such person
shall be deemed to be a Party hereto as if such person's signature appeared on the signature pages hereto. By its execution hereof or any Adoption Agreement, each of the Parties hereto appoints the
Company as its attorney-in-fact for the purpose of executing any Adoption Agreement which may be required to be delivered hereunder. 

        13.    Governing Law.    This Agreement shall be governed by and construed in accordance with the laws of the State of
Delaware, without regard to conflicts of law principles thereof. 

        14.    Entire Agreement.    This Agreement is intended to be the sole agreement of the Parties as it relates to the
subject matter hereof and supersede all other agreements of the Parties relating to the subject matter hereof. 

        15.    Counterparts.    This Agreement may be executed in two or more counterparts, each of which shall be deemed an
original, but all of which together shall constitute one and the same instrument. A facsimile,
telecopy or other reproduction of this Agreement may be executed by one or more parties to this Agreement, and an executed copy of this Agreement may be delivered by one or more parties to this
Agreement by facsimile or similar electronic transmission device pursuant to which the signature of or on behalf of such party can be seen, and such execution and delivery shall be considered valid,
binding and effective for all purposes. 

Signature page follows.

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        IN
WITNESS WHEREOF, the Parties have executed this Agreement as of the date first above written. 

	 	 	 	TA/ADVENT VIII L.P.
	

 	

 	
 	

By:	

TA Associates VIII LLC, its General Partner
	 	 	 	By:	TA Associates, Inc., its Manager
	

 	

 	
 	

By:	

*

	

 	

 	
 	
ADVENT ATLANTIC AND PACIFIC III L.P.
	

 	

 	
 	

By:	

TA Associates AAP III Partners, its General Partner
	 	 	 	By:	TA Associates, Inc.
	

 	

 	
 	

By:	

*

	*
 Kurt R. Jaggers, Attorney-in-Fact	 	 	 
	 	 	 	TA VENTURE INVESTORS L.P.
	Address:	  
  
  
	 	By:	*

	

 	

 	
 	
TA EXECUTIVES FUND LLC
	

 	

 	
 	

By:	

TA Associates, Inc., its Manager
	

 	

 	
 	

By:	

*

	
Signature Page to Voting Agreement

4

 

	

 	

 	
 	
JMI EQUITY FUND III, L.P.
	

 	

 	
 	

By:	

JMI Associates III LLC, its General Partner
	

 	

 	
 	

By:	

  

	 	 	 	Name:	  

	 	 	 	Title:	  

	

 	

 	
 	

Address:	

  
  
  

	

 	

 	
 	

  
 Ronald Woestemeyer
	

 	

 	
 	

Address:	

  
  
  

	

 	

 	
 	

  
 Mariette Woestemeyer
	

 	

 	
 	

Address:	

  
  
  

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EXHIBIT A
  ADOPTION AGREEMENT    
    

        This Adoption Agreement ("Adoption Agreement") is executed by the undersigned (the
"Transferee") pursuant to the terms of that certain Voting Agreement dated as of March 26, 2007 (the
"Agreement") by and among the Company and certain of its stockholders. Capitalized terms used but not defined herein shall have the respective meanings
ascribed to such terms in the Agreement. By the execution of this Adoption Agreement, the Transferee agrees as follows: 

        (a)    Acknowledgment.    Transferee acknowledges that Transferee is acquiring certain shares of the capital stock of
the Company (the "Stock"), subject to the terms and conditions of the Agreement. 

        (b)    Agreement.    Transferee (i) agrees that the Stock acquired by Transferee shall be bound by and subject
to the terms of the Agreement, and (ii) hereby adopts the Agreement with the same force and effect as if Transferee were originally a Party thereto. 

        (c)    Notice.    Any notice required or permitted by the Agreement shall be given to Transferee at the address listed
beside Transferee's signature below. 

        EXECUTED AND DATED this            day
of                        , 200    . 

	 	 	 	TRANSFEREE:
	

 	

 	
 	

By:	

  

	 	 	 	Name:	  

	 	 	 	Title:	  

	 	 	 	Address:	  

	 	 	 	Fax:	  

	

Accepted and Agreed:	
 	

 	

 
	
COMPANY

PROS HOLDINGS, INC.	
 	

 	

 
	

By:	

  
	
 	

 	

 
	Name:	  
	 	 	 
	Title:	  
	 	 	 

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EXHIBIT A ADOPTION AGREEMENT

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