SEC Form 4
FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number: 3235-0287
Estimated average burden
hours per response: 0.5
  
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
1. Name and Address of Reporting Person*
HERLIHY WALTER C

(Last) (First) (Middle)
C/O REPLIGEN CORPORATION
41 SEYON STREET SUITE 100, BUILDING 1

(Street)
WALTHAM MA 02453

(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
REPLIGEN CORP [ RGEN ]
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
3. Date of Earliest Transaction (Month/Day/Year)
05/03/2013
4. If Amendment, Date of Original Filed (Month/Day/Year)
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. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction 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 05/03/2013 05/03/2013 M 50,000 A $3.05 564,916 D
Common Stock 05/03/2013 05/03/2013 F 17,078(1) D $8.93 547,838 D
Common Stock 05/03/2013 05/03/2013 M 80,000 A $5.87 627,838 D
Common Stock 05/03/2013 05/03/2013 F 52,587(2) D $8.93 575,251 D
Common Stock 05/03/2013 05/03/2013 M 20,000 A $3.33 595,251 D
Common Stock 05/03/2013 05/03/2013 F 7,458(3) D $8.93 587,793 D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction 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 (Month/Day/Year) 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: 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
Stock Option (Right to Buy) $3.05(1) 05/03/2013 05/03/2013 M 50,000(1) 04/23/2005 04/30/2014 Common Stock 50,000 $0 235,000 D
Stock Option (Right to Buy) $5.87(2) 05/03/2013 05/03/2013 M 80,000(2) 06/06/2009 06/06/2018 Common Stock 80,000 $0 155,000 D
Stock Option (Right to Buy) $3.33(3) 05/03/2013 05/03/2013 M 20,000(3) 07/15/2011 07/15/2020 Common Stock 20,000 $0 135,000 D
Explanation of Responses:
1. Payment made via forfeiture of 17,078 shares of Common Stock valued at the Closing Price of $8.93 on May 3, 2013.
2. Payment made via forfeiture of 52,587 shares of Common Stock valued at the Closing Price of $8.93 on May 3, 2013.
3. Payment made via forfeiture of 7,458 shares of Common Stock valued at the Closing Price of $8.93 on May 3, 2013.
Remarks:
William J. Kelly (Attorney in Fact) 05/06/2013
** 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 Number.