REPLIGEN CORP - Director's Dealing 2007

SEC Form 4/A — Form 4/A

Issuer: REPLIGEN CORP (RGEN)
CIK: 0000730272
Period of Report: 2007-12-13

Reporting Person: HERLIHY WALTER C (Director, PRESIDENT, CEO)

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2007-12-13	Common Stock	S	2600	$6.15	Disposed	499603	Direct
2007-12-13	Common Stock	S	16850	$6.14	Disposed	482753	Direct
2007-12-13	Common Stock	S	8850	$6.13	Disposed	473903	Direct
2007-12-13	Common Stock	S	12033	$6.12	Disposed	461870	Direct
2007-12-13	Common Stock	S	6467	$6.11	Disposed	455403	Direct
2007-12-13	Common Stock	S	600	$6.105	Disposed	454803	Direct
2007-12-13	Common Stock	S	2600	$6.10	Disposed	452203	Direct

F1: Incorrectly reported these securities as acquired, when in fact they were disposed of as a sale.

F2: Incorrectly reported these securities as acquired, when in fact they were disposed of as a sale.

F3: Incorrectly reported these securities as acquired, when in fact they were disposed of as a sale.

F4: Incorrectly reported these securities as acquired, when in fact they were disposed of as a sale.

F5: Incorrectly reported these securities as acquired, when in fact they were disposed of as a sale.

F6: Incorrectly reported these securities as acquired, when in fact they were disposed of as a sale.

F7: Incorrectly reported this sales transaction code as a "D", when in fact it was an open market sale.

F8: Incorrectly reported this sales transaction code as a "D", when in fact it was an open market sale.

F9: Incorrectly reported this sales transaction code as a "D", when in fact it was an open market sale.

F10: Incorrectly reported this sales transaction code as a "D", when in fact it was an open market sale.

F11: Incorrectly reported this sales transaction code as a "D", when in fact it was an open market sale.

F12: Incorrectly reported this sales transaction code as a "D", when in fact it was an open market sale.

F13: Incorrectly reported this sales transaction code as a "D", when in fact it was an open market sale.