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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1068796	Maxygen Inc	MAXY	Services-Commercial Physical & Biological Research (8731)	770449487

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1180772	Isaac Stein	C/O Maxygen, Inc. 515 Galveston Drive Redwood City CA 94063		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	2011-05-19	20,000	$5.16	312,706	No	4	P	Indirect	Trust

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Indirect	Trust

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	260,000	Direct
Common Stock	63,198	Indirect	By Technogen

Footnotes

The purchase price reported in column 4 of Table I represents the weighted average purchase price of the shares purchased ranging from $5.10 to $5.19 per share. Upon request by the Commission staff, the issuer, or a security holder of the issuer, the reporting person will provide full information regarding the number of shares purchased at each separate price within the range set forth in this footnote (1).
Stein 1995 Revocable Trust
Includes 160,000 shares of restricted stock that have not yet vested.
The amount of securities reported consists of shares of common stock of the Company held by Technogen Enterprises, L.L.C. Mr. Stein is a Managing Member of Technogen Enterprises, L.L.C. and has shared power to vote or direct the vote of and shared power to dispose or direct the disposition of the shares held by the limited liability company. Mr. Stein disclaims beneficial ownership of these shares except to the extent of his pecuniary interest in the limited liability company.