REGENERON PHARMACEUTICALS, INC. — Director's Dealing 2011

Sep 8, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: REGENERON PHARMACEUTICALS INC (REGN)
CIK: 0000872589
Period of Report: 2011-09-06

Reporting Person: SCHLEIFER LEONARD S (Director, CEO & President)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-09-06	Common Stock	S	90	$63.01	Disposed	810	Indirect
2011-09-06	Common Stock	S	180	$65.56	Disposed	630	Indirect
2011-09-06	Common Stock	S	630	$66.54	Disposed	0	Indirect
2011-09-06	Common Stock	C	7000	—	Acquired	7000	Indirect
2011-09-06	Common Stock	S	3500	$65.27	Disposed	3500	Indirect
2011-09-06	Common Stock	S	2700	$66.42	Disposed	800	Indirect
2011-09-06	Common Stock	S	300	$67.50	Disposed	500	Indirect
2011-09-06	Common Stock	S	500	$68.42	Disposed	0	Indirect

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-09-06	Class A Stock	$0	C	7000	Disposed		Common Stock (7000)	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	78765	Direct
Common Stock	100000	Indirect
Common Stock	5416	Indirect

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Class A Stock	$0		Common Stock (1710790)	1710790	Direct

Footnotes

F1: Disposition/acquisition made pursuant to a plan intended to comply with Rule 10b5-1(c).

F2: Represents volume-weighted average price of sales of 180 shares of Company stock on September 6, 2011 at prices ranging from $65.53 to $65.64. Upon request by the Commission staff, the Company, or a security holder of the Company, the reporting person will provide full information regarding the number of shares sold by the trust on September 6, 2011 at each separate price.

F3: Represents volume-weighted average price of sales of 630 shares of Company stock on September 6, 2011 at prices ranging from $66.08 to $66.99.. Upon request by the Commission staff, the Company, or a security holder of the Company, the reporting person will provide full information regarding the number of shares sold by the trust on September 6, 2011 at each separate price.

F4: Shares of Class A Stock are convertible at any time on a share-for-share basis into Common Stock.

F5: Represents volume-weighted average price of sales of 3,500 shares of Company stock on September 6, 2011 at prices ranging from $65.00 to $65.98. Upon request by the Commission staff, the Company, or a security holder of the Company, the reporting person will provide full information regarding the number of shares sold by the trust on September 6, 2011 at each separate price.

F6: Represents volume-weighted average price of sales of 2,700 shares of Company stock on September 6, 2011 at prices ranging from $66.03 to $66.94. Upon request by the Commission staff, the Company, or a security holder of the Company, the reporting person will provide full information regarding the number of shares sold by the trust on September 6, 2011 at each separate price.

F7: Represents volume-weighted average price of sales of 300 shares of Company stock on September 6, 2011 at prices ranging from $67.25 to $67.81. Upon request by the Commission staff, the Company, or a security holder of the Company, the reporting person will provide full information regarding the number of shares sold by the trust on September 6, 2011 at each separate price.

F8: Represents volume-weighted average price of sales of 500 shares of Company stock on September 6, 2011 at prices ranging from $68.15 to $68.88. Upon request by the Commission staff, the Company, or a security holder of the Company, the reporting person will provide full information regarding the number of shares sold by the trust on September 6, 2011 at each separate price.

F9: Exercisable date, exercise date, exercise price, purchase price, sales price, and/or expiration date is/are not applicable in this case.