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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
1013064	Roy P Vagelos	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	Disposition	2010-12-16	17,384	$32.04	153,128	No	4	S	Direct
Common Stock	Disposition	2010-12-17	12,616	$32.06	140,512	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Direct
No	4	S	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	2,156	Indirect	By 401(k) Plan
Common Stock	190,119	Indirect	by CLAT
Common Stock	125,000	Indirect	by GRAT
Common Stock	235,000	Indirect	by Spouse as Trustee

Footnotes

Disposition/acquisition made pursuant to a plan intended to comply with Rule 10b5-1(c).
The reporting person sold 17,384 shares of Company stock on December 16, 2010 at prices ranging from $32.00 to $32.20. 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 reporting person on December 16, 2010 at each separate price.
The reporting person sold 12,616 shares of Company stock on December 17, 2010 at prices ranging from $32.00 to $32.20. 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 reporting person on December 17, 2010 at each separate price.