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
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 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*
ACKLEY ROBERT W
(Last) (First) (Middle)
CROMPTON CORPORATION
1 EXTRUSION DRIVE
(Street)
PAWCATUCK CT 06379
(City) (State) (Zip)
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
X Officer (give title below) Other (specify below)
Executive V.P. - Polymer Proc.
3. Date of Earliest Transaction (Month/Day/Year)
04/05/2005
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 04/05/2005 J 11,985 A $8.3437 179,685 D
Common Stock 04/05/2005 J 12,626 A $7.92 192,311 D
Common Stock 04/05/2005 J 13,793 A $7.25 206,104 D
Common Stock 04/05/2005 J 15,673 A $6.38 221,777 D
Common Stock 2,601.4596 I By Wife
Common Stock 04/05/2005 J(1) 340.6794 A $0 3,700.07 I ESOP Trust
Common Stock 04/05/2005 J(2) 134 A $0 36,004.77 I LTIP Trust (1TA)
Common Stock 04/05/2005 J(3) 134 A $0 15,171.14 I LTIP Trust 1988
Common Stock 51.2041 I ESPP
Common Stock 04/05/2005 J(4) 72 A $0 19,340 I Restricted Stock Account
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
NQ Stock Option (Right to Buy) $5.85 10/20/2004 11/19/2013 Common Stock 45,000 45,000 D
NQ Stock Option (Right to Buy) $6.38 01/21/2004 02/20/2013 Common Stock 43,654 43,654 D
NQ Stock Option (Right to Buy) $7.25 10/22/2003 11/21/2012 Common Stock 26,207 26,207 D
NQ Stock Option (Right to Buy) $7.92 10/23/2002 11/22/2011 Common Stock 47,374 47,374 D
NQ Stock Option (Right to Buy) $8.1562 10/31/2001 11/30/2010 Common Stock 75,000 75,000 D
NQ Stock Option (Right to Buy) $8.3437 10/19/2000 11/19/2009 Common Stock 88,015 88,015 D
NQ Stock Option (Right to Buy) $13 08/04/1999 12/18/2005 Common Stock 18,808 18,808 D
NQ Stock Option (Right to Buy) $14.3438 08/05/1999 11/14/2008 Common Stock 50,000 50,000 D
NQ Stock Option (Right to Buy) $14.5 08/04/1999 09/21/2006 Common Stock 72,416 72,416 D
NQ Stock Option (Right to Buy) $16.875 08/04/1999 11/16/2006 Common Stock 20,000 20,000 D
NQ Stock Option (Right to Buy) $26.4063 08/04/1999 11/07/2007 Common Stock 20,000 20,000 D
ISO Stock Option (Right to Buy) $6.38 04/05/2005 J(5) 15,673 01/21/2005 01/21/2013 Common Stock 31,346 $6.38 15,673 D
ISO Stock Option (Right to Buy) $7.25 04/05/2005 J(5) 13,793 10/22/2004 10/22/2012 Common Stock 13,793 $7.25 0 D
ISO Stock Option (Right to Buy) $7.92 04/05/2005 J(5) 12,626 10/23/2003 10/23/2011 Common Stock 12,626 $7.92 0 D
ISO Stock Option (Right to Buy) $8.3437 04/05/2005 J(5) 11,985 10/19/2002 10/19/2009 Common Stock 11,985 $8.3437 0 D
ISO Stock Option (Right to Buy) $13 08/04/1999 10/18/2005 Common Stock 7,692 7,692 D
ISO Stock Option (Right to Buy) $14.5 08/04/1999 08/21/2006 Common Stock 27,584 27,584 D
Explanation of Responses:
1. These shares were acquired during the fiscal year pursuant to the Registrant's Employee Stock Ownership Plan and through reinvestment of dividends paid on the shares in this fund (ESOP Trust).
2. These shares were acquired during the fiscal year pursuant to the Long Term Incentive Plan (LTIP Trust (1TA)) and through reinvestment of dividends paid on the shares in this fund.
3. These shares were acquired during the fiscal year pursuant to the 1988 Long Term Incentive Plan and through reinvestment of dividends paid on the shares in this fund.
4. These shares were acquired during the fiscal year pursuant to the 2004-2006 Long Term Incentive Plan and through reinvestment of dividends paid on the shares in this fund.
5. Excercise of an Incentive Stock Option.
Robert W. Ackley 04/06/2005
** 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.
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