Ownership Submission
FORM 5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Form 3 Holdings Reported
Form 4 Transactions Reported
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

ANNUAL 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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1. Name and Address of Reporting Person *
CALARCO VINCENT A
 2. Issuer Name and Ticker or Trading Symbol
CROMPTON CORP [CK] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
_____ Officer (give title below) __X__ Other (specify below)
Former Director
(Last)
(First)
(Middle)

199 BENSON ROAD		 3. Statement for Issuer's Fiscal Year Ended (Month/Day/Year)
12/31/2004
(Street)


MIDDLEBURY, CT 06749		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Reporting
(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 at end of Issuer's Fiscal Year
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Amount (A) or (D) Price
Common Stock             1,081,350 D  
Common Stock             60,816.4413 I DRIP

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. 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 control number. SEC 2270 (9-02)

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 at End of Issuer's Fiscal Year
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
(A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
NQ Stock Option (Right to Buy) $ 6.38           01/21/2005 06/30/2009 Common Stock
390,000
  390,000
D
 
NQ Stock Option (Right to Buy) $ 7.25           10/22/2003 06/30/2009 Common Stock
225,000
  225,000
D
 
NQ Stock Option (Right to Buy) $ 7.92           10/23/2003 06/30/2009 Common Stock
350,000
  350,000
D
 
NQ Stock Option (Right to Buy) $ 8.1562           10/31/2001 06/30/2009 Common Stock
375,000
  375,000
D
 
NQ Stock Option (Right to Buy) $ 8.3437           10/19/2002 06/30/2009 Common Stock
800,000
  800,000
D
 
NQ Stock Option (Right to Buy) $ 13           08/04/1999 10/18/2005 Common Stock
7,692
  7,692
D
 
NQ Stock Option (Right to Buy) $ 13           08/04/1999 11/18/2005 Common Stock
102,308
  102,308
D
 
NQ Stock Option (Right to Buy) $ 14.3437           08/05/1999 11/14/2008 Common Stock
250,000
  250,000
D
 
NQ Stock Option (Right to Buy) $ 14.5           08/04/1999 08/21/2006 Common Stock
27,584
  27,584
D
 
NQ Stock Option (Right to Buy) $ 14.5           08/04/1999 09/21/2006 Common Stock
472,416
  472,416
D
 
NQ Stock Option (Right to Buy) $ 16.875           08/04/1999 11/16/2006 Common Stock
120,000
  120,000
D
 
NQ Stock Option (Right to Buy) $ 26.4063           08/04/1999 11/07/2007 Common Stock
120,000
  120,000
D
 

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
CALARCO VINCENT A
199 BENSON ROAD
MIDDLEBURY, CT 06749		       Former Director

Signatures

Vincent A. Calarco 02/10/2005
**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).

Note: File three copies of this Form, one of which must be manually signed. If space provided is insufficient, see Instruction 6 for procedure.

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