FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  Tobin Matthew
 2. Date of Event Requiring Statement (Month/Day/Year)
08/28/2012		 3. Issuer Name and Ticker or Trading Symbol
CODEXIS INC [CDXS]
(Last)
(First)
(Middle)
C/O CODEXIS, INC., 200 PENOBSCOT DRIVE		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
SVP, Research & Development
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

REDWOOD CITY, CA 94063		 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock 46,941 (1)
D
 

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Option (Right to Buy)   (2) 05/26/2013 Common Stock 3,033 $ 0.6 D  
Stock Option (Right to Buy)   (3) 01/04/2015 Common Stock 2,000 $ 0.9 D  
Stock Option (Right to Buy)   (4) 12/12/2015 Common Stock 6,666 $ 1.05 D  
Stock Option (Right to Buy)   (5) 08/27/2017 Common Stock 5,333 $ 6.71 D  
Stock Option (Right to Buy)   (6) 12/10/2017 Common Stock 6,666 $ 8.69 D  
Stock Option (Right to Buy)   (7) 01/28/2018 Common Stock 10,000 $ 10.5 D  
Stock Option (Right to Buy)   (8) 06/01/2019 Common Stock 19,999 $ 7.46 D  
Stock Option (Right to Buy)   (9) 04/26/2020 Common Stock 20,666 $ 10.92 D  
Stock Option (Right to Buy)   (10) 01/25/2021 Common Stock 15,000 $ 9.15 D  
Stock Option (Right to Buy)   (11) 03/06/2022 Common Stock 29,000 $ 3.56 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Tobin Matthew
C/O CODEXIS, INC.
200 PENOBSCOT DRIVE
REDWOOD CITY, CA 94063		       SVP, Research & Development  

Signatures

/s/ Dave Swarthout, as Attorney-in-Fact for Matthew Tobin 09/07/2012
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Includes 22,500 Restricted Stock Units. The Reporting Person is entitled to receive one (1) share of common stock for each one (1) restricted stock unit.
(2) Option vested with respect to 25% of the shares subject thereto on May 16, 2004, and 1/48th of the shares vested monthly thereafter, such that the option was fully vested and exercisable on May 16, 2007.
(3) Option vested with respect to 25% of the shares subject thereto on January 1, 2006, and 1/48th of the shares vested monthly thereafter, such that the option was fully vested and exercisable on January 1, 2009.
(4) Option vested with respect to 25% of the shares subject thereto on January 1, 2007, and 1/48th of the shares vested monthly thereafter, such that the option was fully vested and exercisable on January 1, 2010.
(5) Option vested with respect to 25% of the shares subject thereto on August 28, 2008, and 1/48th of the shares vested monthly thereafter, such that the option was fully vested and exercisable on August 28, 2011.
(6) Option vested with respect to 25% of the shares subject thereto on November 16, 2008, and 1/48th of the shares vested monthly thereafter, such that the option was fully vested and exercisable on November 16, 2011.
(7) Option vested with respect to 25% of the shares subject thereto on January 1, 2009, and 1/48th of the shares vested monthly thereafter, such that the option was fully vested and exercisable on January 1, 2012.
(8) Option vests with respect to 1/24th of the shares subject thereto on each monthly anniversary of January 1, 2011, such that the option will be fully vested and exercisable on January 1, 2013.
(9) Option vested with respect to 25% of the shares subject thereto on January 1, 2011, with 1/48th of the shares vesting monthly thereafter, such that the option will be fully vested and exercisable on January 1, 2014.
(10) Option vested with respect to 25% of the shares subject thereto on January 26, 2012, with 1/48th of the shares vesting monthly thereafter, such that the option will be fully vested and exercisable on January 26, 2015.
(11) Option vests with respect to 25% of the shares subject thereto on March 7, 2013, with 1/48th of the shares vesting monthly thereafter, such that the option will be fully vested and exercisable on March 7, 2016.

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