FORM 4
[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public
Utility Holding Company Act of 1935 or Section 30(f) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Reiner Andres
2. Issuer Name and Ticker or Trading Symbol

PROS Holdings, Inc. [ PRO ]
5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

__ X __ Director                      _____ 10% Owner
__ X __ Officer (give title below)      _____ Other (specify below)
President & CEO
(Last)          (First)          (Middle)

3100 MAIN STREET, SUITE 900
3. Date of Earliest Transaction (MM/DD/YYYY)

3/13/2012
(Street)

HOUSTON, TX 77002
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock   3/13/2012     M    8333   A $18.87   (1) 119072   (2) D    
Common Stock   3/13/2012     F    3038   D $18.87   (1) 116034   D    

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Restricted Stock Units     (3) 3/13/2012     M         8333      (4)   (4) Common Stock   8333   $ 0   167500   (2) D    

Explanation of Responses:
( 1)  Represents the price of PROS Holdings, Inc. common stock at the close of market on March 13, 2012.
( 2)  Includes (i) 15,000 of unvested restricted stock which will vest in equal installments over the next two years on February 24th associated with the March 9, 2010 grant, (ii) 37,500 of unvested restricted stock which will vest in in equal installments over the next three years on the date of grant associated with the December 14, 2010 grant, (iii) 35,000 of unvested restricted stock which will vest in equal installments over the next four years on the date of grant associated with the May 10, 2011 grant and (iv) 80,000 of unvested restricted stock units which will vest in equal installments over the next four years on January 1st associated with a February 14, 2012 grant.
( 3)  Each restricted stock unit represents the contingent right to receive one share of PROS Holdings, Inc. common stock.
( 4)  The original restricted stock unit grant was awarded on March 13, 2009 in the amount of 25,000 restricted stock units and vest annually, in equal installments, over a three year period commencing March 13, 2010.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Reiner Andres
3100 MAIN STREET
SUITE 900
HOUSTON, TX 77002
X
President & CEO

Signatures
J. Scott McClendon, Attorney-in-fact for Andres Reiner 3/14/2012
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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