Exhibit 10.26

COMPENSATION INFORMATION FOR EXECUTIVE OFFICERS

The table below provides information regarding the 2005 cash bonus,
December 2, 2005 stock option grant, 2006 stock option grants through March 15, 2006, 2006 annual base salary and 2006 target cash bonus of each executive officer of Kosan Biosciences Incorporated listed below.



|                                                                                                             |  |                 |         |   |                                                  |         |   |                                        |        |                        |   |                          |  |     |  
|------------------------------------------------------------------------------------------------------------ |  | --------------- | ------- | - | ------------------------------------------------ | ------- | - | -------------------------------------- | ------ | ---------------------- | - | ------------------------ |  | --- | -
|Executive Officer                                                                                            |  | 2005 Cash Bonus |         |   | December 2, 2005 Stock OptionGrant(1) (# shares) |         |   | 2006 Stock Option Grants(2) (#
shares) |        | 2006 AnnualBase Salary |   | 2006 TargetCash Bonus(3) | 
|Robert G. Johnson, Jr., M.D., Ph.D. Chief Executive Officer                                                  |  | $               | 75,000  |   |                                                  | 52,500  |   |                                        | 25,000 |                        | $ | 365,000                  |  | 45  | %
|                                                                                                             |  |                 |         |   |                                                 
|Margaret A. Horn, J.D. Senior Vice President, Legal and Corporate Development, General Counsel and Secretary |  |                 | (4      | ) |                                                  | 150,000 |   |                                        | 20,000 |                        | $ | 300,000                  |  | 35  | %
|                                                                                                             |  |                 |         |   |                                                 
|Peter J. Licari, Ph.D. Senior Vice President, Manufacturing and Operations                                   |  |                 | (5      | ) |                                                  | (5      | ) |                                        | 15,000 |                        | $ | 222,610                  |  | 30  | %
|                                                                                                             |  |                 |         |   |                                                 
|Pieter B.M.W.M. Timmermans, Ph.D. Senior Vice President, Drug Discovery and Preclinical Research             |  |                 | (5      | ) |                                                  | (5      | ) |                                        | 20,000 |                        | $ | 249,890                  |  | 30  | %
|                                                                                                             |  |                 |         |   |                                                 
|Daniel V. Santi, M.D., Ph.D.(6) Former Chairman and Chief Executive Officer                                  |  | $               | 105,000 |   |                                                  | 78,750  |   |                                        |       |                        | $ | 445,000                  |  | 45  | %
|                                                                                                             |  |                 |         |   |                                                 
|Susan M. Kanaya(7) Former Senior Vice President, Finance and Chief Financial Officer                         |  | $               | 57,000  |   |                                                  | 37,500  |   |                                        |       |                        |   | N/A                      |  | N/A |  

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|(1) | Granted on December 2, 2005, with an exercise price per share of $7.21, except that the option grant to Dr. Santi had an exercise price per share equal to $7.93. Each of
these stock options vests ratably over 48 months, except that the stock option granted to Ms. Horn vests 25% on December 1, 2006 and 1/48 monthly thereafter for three years.
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|(2) | Ms. Horns stock option was granted on January 3, 2006 with an exercise price per share of $4.46. Dr. Johnsons stock option was granted on
February 14, 2006 with an exercise price per share of $4.875. Dr. Licaris and Dr. Timmermans stock options were granted on February 17, 2006 with an exercise price per share equal to $4.66. Each of these stock options
vests 25% one year after the date of grant and 1/48 monthly thereafter for three years, except that Dr. Johnsons stock option vests ratably over 48 months.
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|(3) | Percentage of each executive officers 2006 annual base salary.
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|(4) | Ms. Horn joined the Company on December 1, 2005, and therefore, did not receive a 2005 cash bonus.
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|(5) | Drs. Licari and Timmermans were named as executive officers of the Company on February 17, 2006.
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|(6) | Dr. Santi resigned as Chief Executive Officer of the Company effective February 13, 2006.
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|(7) | Ms. Kanaya resigned as Senior Vice President, Finance and Chief Financial Officer of the Company effective January 1, 2006.
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