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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1047188	Penwest Pharmaceuticals Co	PPCO	Pharmaceutical Preparations (2834)	911513032

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1100962	Endo Pharmaceuticals Holdings Inc	100 Endo Boulevard Chadds Ford PA 19317		No	No	Yes	No
1501813	West Acquisition Corp.	100 Endo Boulevard Chadds Ford PA 19317		No	No	Yes	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, Par Value $0.001 Per Share	Acquisiton	2010-11-04	3,173,334	$0.00	33,627,009	No	4	P	Indirect	owned through wholly owned corporation

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Indirect	owned through wholly owned corporation

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Options	Options	Acquisiton	2010-11-04	928	$0.00	928	$2.62
Options	Options	Acquisiton	2010-11-04	398	$0.00	398	$3.05
Options	Options	Acquisiton	2010-11-04	250	$0.00	250	$3.81

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
1,576	2009-03-13	2010-12-31	No	4	P	Indirect
1,576	2009-06-11	2010-12-31	No	4	P	Indirect
1,576	2009-01-22	2010-12-31	No	4	P	Indirect

Footnotes

Reflects shares of common stock, par value $0.001 per share ("Shares"), not tendered in the tender offer pursuant to the Agreement and Plan of Merger, dated August 9, 2010, by and among the Company, Endo Pharmaceuticals Holdings Inc. ("Parent") and West Acquisition Corp., a Delaware corporation and an indirect wholly-owned subsidiary of Parent ("Purchaser"), and deemed acquired at a price of $5.00 per Share, net to the seller in cash, without interest and less any required withholding taxes, pursuant to the consummation of the merger of the Purchaser with and into the Company (the "Merger"). At the effective time of the Merger, the aforementioned shares and options were cancelled and ceased to exist and each share of the Purchaser converted into shares of the Company. Purchaser's separate corporate existence ceased and the Company survived as an indirect wholly owned subsidiary of the Parent.