Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 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 *
OSAR KAREN R
   2. Issuer Name and Ticker or Trading Symbol
Chemtura CORP [CEM] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Exec. V.P. & CFO
(Last)
(First)
(Middle)
199 BENSON ROAD		 3. Date of Earliest Transaction (Month/Day/Year)
01/30/2006
(Street)

MIDDLEBURY, CT 06749		 4. If Amendment, Date 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
(City)
(State)
(Zip)
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 01/30/2006(1)   J(2)   4,217 A $ 12.1 57,289 D  
Common Stock 01/30/2006(3)   J(4)   6,623 D $ 12.1 12,505 I Restricted Stock Account
Common Stock               16,500 I Restricted Stock Account II
Common Stock               16,710 I Restricted Stock Account III
Common Stock               567 I Savings Plan (401k) Trust

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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 Underlying Securities
(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 of Derivative Security: 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
NQ Stock Option (Right to Buy) $ 11.24             11/23/2005 12/22/2014 Common Stock 50,000   50,000 D  
NQ Stock Option (Right to Buy) $ 12.92             02/23/2006 03/22/2015 Common Stock 50,000   50,000 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
OSAR KAREN R
199 BENSON ROAD
MIDDLEBURY, CT 06749		       Exec. V.P. & CFO  

Signatures

 Karen R. Osar   01/30/2006
**Signature of Reporting Person Date

Explanation of Responses:

* 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).
(3) Transaction date was January 24, 2006. Filing software would not accept the January 24, 2006 date in this Form 4 as a Form 5 for the Reporting Person was filed on January 27, 2006.
(1) Transaction date was January 24, 2006. Filing software would not accept the January 24, 2006 date in this Form 4 as a Form 5 for the Reporting Person was filed on January 27, 2006.
(2) Direct holdings increased by 4,217 shares transferred from the 2004-2006 Long-Term Incentive Plan (Restricted Stock Account).
(4) 6,623 shares were distributed to the Reporting Person in connection with the 2004-2006 Long-Term Incentive Plan from the Restricted Stock Account, of which 2,406 shares werw withheld to satisfy tax withholding requirements.

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