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SEC FORM 4 SEC Form 4
FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940 		 
OMB APPROVAL
OMB Number: 3235-0287
Estimated average burden
hours per response: 0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
1. Name and Address of Reporting Person*
van Walsem Johan
(Last) (First) (Middle)
C/O METABOLIX, INC.
21 ERIE STREET
(Street)
CAMBRIDGE MA 02139
(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
METABOLIX, INC. [ MBLX ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director 10% Owner
X Officer (give title below) Other (specify below)
VP Mfg, Dev. and Ops.
3. Date of Earliest Transaction (Month/Day/Year)
10/01/2007
4. If Amendment, Date of Original Filed (Month/Day/Year)
 6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 10/01/2007 M(1) 5,000 A $1.6518 5,000 D
Common Stock 10/01/2007 S(1) 5,000 D $23.97(3) 0 D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year) 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Option (right to buy) $1.6518 10/01/2007 M(1) 5,000 (2) 09/20/2015 Common Stock 5,000 $0 154,806 D
Explanation of Responses:
1. Transaction effected pursuant to a Rule 10b5-1 trading plan established by the reporting person on 3/15/07.
2. This stock option vests in quarterly installments over a period of 4 years from 10/1/04.
3. Price reflected is the average sale price for the shares sold. Please see attached Exhibit 99 for a complete list of all sales by sale price.
/s/ Sarah P. Cecil, attorney-in-fact 10/02/2007
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
Exhibit 99 to Form 4 filed on behalf of Johan Van
Walsem for Transaction Date 10/1/07

PRICE	QUANTITY
$23.8500  100
$23.8600  100
$23.8700  100
$23.9400  200
$24.0400  100
$24.0800  100
$24.0900  100
$24.1000  200
$23.9600  100
$23.9700  400
$23.9900  100
$24.0500  100
$24.1300  100
$24.1400  100
$24.1600  100
$23.3500  286
$23.3800  214
$23.4400  100
$23.4500  300
$23.5400  100
$24.2400  100
$24.2500  400
$24.2700  100
$24.3000  100
$24.3300  100
$24.3500  100
$24.3600  100
$24.0200  100
$24.0600  200
$24.0700  100
$24.0800 100
$24.0900 100
$24.1900 100
$24.2000 100
$24.2300 200