REPLIGEN CORP — Director's Dealing 2018

Jul 31, 2018

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: REPLIGEN CORP (RGEN)
CIK: 0000730272
Period of Report: 2018-07-26

Reporting Person: EDDLEMAN ROY T (10% Owner)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2018-07-26	Call option(obligation to sell)	$53.9372	S	1	Disposed	2019-07-26	Common Stock (250000)	Indirect
2018-07-26	Put option (right to sell)	$43.891	P	1	Acquired	2019-07-26	Common Stock (250000)	Indirect

Footnotes

F1: The reporting person entered into a so-called zero-cost collar arrangement pursuant to which he wrote a covered call option and purchased a put option. Only one of the options can be "in the money" on the expiration date, at which time the in-the-money option will be exercised (or settled in cash), and the other option will expire. If neither option is in the money on the expiration date, both will expire.

F2: The securities shown are held of record by the Roy T. Eddleman Living Trust UAD 8-7-2000, of which the reporting person is the sole trustee and, as such, has investment and voting control over such securities.