KOSAN BIOSCIENCES INC

Beneficial ownership report for a passive holder of more than 5% (Schedule 13G) (amendment)

No description available

Beneficial ownership report for a passive holder of more than 5% (Schedule 13G) (amendment)

Beneficial ownership report for a passive holder of more than 5% (Schedule 13G) (amendment)

Beneficial ownership report for a passive holder of more than 5% (Schedule 13G) (amendment)

No description available

Tender offer statement by a third party (amendment)

Notification of removal from listing and/or registration on a national securities exchange

Certification of termination of registration of a class of securities (Section 12(g))

No description available

Tender offer statement by a third party (amendment)

1.01,3.03,9.01

No description available

No description available

General form for quarterly reports under Section 13 or 15(d)

Departure of Directors or Principal Officers; Election of Directors; Appointment of Principal Officers

Results of Operations and Financial Condition

Annual Report Scanned (Paper)

Definitive Proxy Statement

8.01,9.01

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

2.05,5.02

Annual report pursuant to Section 13 or 15(d)

5.02

Results of Operations and Financial Condition

Departure of Directors or Principal Officers; Election of Directors; Appointment of Principal Officers

8.01,9.01

8.01,9.01

5.02

8.01,9.01

Departure of Directors or Principal Officers; Election of Directors; Appointment of Principal Officers

8.01,9.01

General form for quarterly reports under Section 13 or 15(d)

2.02,9.01

Termination of a Material Definitive Agreement

Notice of Effectiveness

Registration statement under Securities Act of 1933 (amendment)

Departure of Directors or Principal Officers; Election of Directors; Appointment of Principal Officers

Registration statement under Securities Act of 1933

General form for quarterly reports under Section 13 or 15(d)

Results of Operations and Financial Condition

General form for quarterly reports under Section 13 or 15(d)

2.02,9.01

Annual Report Scanned (Paper)

Definitive Proxy Statement

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Annual report pursuant to Section 13 or 15(d)

2.02,9.01

Prospectus Supplement for Primary Offering

General form for quarterly reports under Section 13 or 15(d)

Prospectus Supplement for Primary Offering

Notice of Effectiveness

Registration statement under Securities Act of 1933 (amendment)

Registration statement under Securities Act of 1933

General form for quarterly reports under Section 13 or 15(d)

FILED AS OF DATE: 20060803

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Additional Information for Proxy Statement/ Votes

General form for quarterly reports under Section 13 or 15(d)

Definitive Proxy Statement

Prospectus Supplement for Primary Offering

Prospectus Supplement for Primary Offering

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Annual report pursuant to Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

Correspondence with the SEC

Correspondence with the SEC

Prospectus Supplement for Primary Offering

Prospectus Supplement for Primary Offering

General form for quarterly reports under Section 13 or 15(d)

Prospectus Supplement for Primary Offering

General form for quarterly reports under Section 13 or 15(d)

Definitive Proxy Statement

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Annual report pursuant to Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d) (amendment)

General form for quarterly reports under Section 13 or 15(d)

Definitive Proxy Statement

Annual report pursuant to Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

Definitive Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Preliminary Proxy Statement

Cohen Pamela Sarah

Licari Peter

Timmermans Pieter B

Titus Gary

Wright Jonathan K.

Kim Helen Susan

Clemens Kevan

DELEAGE JEAN

WALSH CHRISTOPHER T PHD

KHOSLA CHAITAN PHD

DAVIS PETER PHD

CHABNER BRUCE A MD