X0202 4 2006-03-24 0001100813 OPSWARE INC OPSW 0001160077 ANDREESSEN MARC L C/O OPSWARE INC. 599 N MATHILDA AVENUE SUNNYVALE CA 94086 1 0 1 0 Common stock 2006-03-24 4 S 0 161436 8.00 D 1328564 I By Trust Common stock 2006-03-27 4 S 0 25259 8.00 D 1303305 I By Trust Common stock 2006-03-28 4 S 0 303305 8.00 D 1000000 I By Trust Common stock 6153785 I By Trust Common stock 1438000 I By Trust Sales reported on this Form 4 are pursuant to a 10b5-1 Plan adopted by the reporting person on September 1, 2004 and amended August 31, 2005. These shares are held by Wilmington Trust Company, as Trustee, pursuant to a 10b5-1 Plan adopted by the reporting person on September 1, 2004, amended August 31, 2005. These shares are owned directly by the 1996 Andreessen Living Trust, and indirectly by Marc L. Andreessen or Michael G. Mohr as trustees of the Trust. Marc L. Andreessen is a director and a ten percent owner of the issuer. These shares are owned directly by the 1996 Andreessen Charitable Remainder Trust, and indirectly by Marc L. Andreessen or Michael G. Mohr as trustees of the Trust. Marc L. Andreessen is a director and a ten percent owner of the issuer. /s/Robert R. Ghoorah, Attorney-in-fact 2006-03-28