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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
872589	Regeneron Pharmaceuticals Inc	REGN	Pharmaceutical Preparations (2834)	133444607

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1225472	M Eric Shooter	777 Old Saw Mill River Road Tarrytown NY 10591		Yes	No	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2012-02-23	10,000	$0.00	10,000	No	4	C	Indirect	GRAT self
Common Stock	Disposition	2012-02-23	9,600	$103.51	400	No	4	S	Indirect	GRAT self
Common Stock	Disposition	2012-02-23	400	$104.05	0	No	4	S	Indirect	GRAT self
Common Stock	Acquisiton	2012-02-23	10,000	$0.00	10,000	No	4	C	Indirect	GRAT spouse
Common Stock	Disposition	2012-02-23	9,600	$103.51	400	No	4	S	Indirect	GRAT spouse
Common Stock	Disposition	2012-02-23	400	$104.05	0	No	4	S	Indirect	GRAT spouse

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	C	Indirect	GRAT self
No	4	S	Indirect	GRAT self
No	4	S	Indirect	GRAT self
No	4	C	Indirect	GRAT spouse
No	4	S	Indirect	GRAT spouse
No	4	S	Indirect	GRAT spouse

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Class A Stock	Disposition	2012-02-23	10,000	$0.00	10,000	$0.00
Common Stock	Class A Stock	Disposition	2012-02-23	10,000	$0.00	10,000	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
10,000			No	4	C	Indirect
10,000			No	4	C	Indirect

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	5,000	Indirect	by Trust

Reported Derivative Holdings

Sec. Name	Sec. Type	Price	Date	Expiration Date	Amount	Remaning Holdings	Nature of Ownership
Common Stock	Class A Stock	$0.00			36,911	36,911	Indirect

Expiration Date	Amount	Remaning Holdings	Nature of Ownership
	36,911	36,911	Indirect

Footnotes

Class A Stock of Regeneron Pharmaceuticals, Inc. ("Regeneron") converts to Common Stock of Regeneron on a one-to-one basis upon certain events.
Represents volume-weighted average price of sales of 9,600 shares of Company stock on February 23, 2012 at prices ranging from $103.01 to $103.98. 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 GRAT on February 23, 2012 at each separate price.
Represents volume-weighted average price of sales of 400 shares of Company stock on February 23, 2012 at prices ranging from $104.01 to $104.12. 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 GRAT on February 23, 2012 at each separate price.
Exercisable date, exercise date, exercise price, purchase price, sales price, and/or expiration date is/are not applicable in this case.
The reporting person and his spouse are co-trustees and beneficiaries of the Shooter Family Trust.