Sanofi — Director's Dealing 2011

Apr 6, 2011

SEC Form 3 — Initial Statement of Beneficial Ownership

Issuer: GENZYME CORP (GENZ)
CIK: 0000732485
Period of Report: 2011-04-05

Reporting Person: SANOFI-AVENTIS (10% Owner)
Reporting Person: GC Merger Corp. (10% Owner)

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock, $0.01 par value	184038545	Indirect

Footnotes

F1: Reflects shares exchanged in an exchange offer.

F2: The shares are held by GC Merger Corp. (the "Purchaser"). The Purchaser is direct wholly-owned subsidiary of sanofi-aventis ("Parent") and is the owner of the shares purchased in the exchange offer. The shares may also be deemed to be indirectly beneficially owned by Parent.