1. Name and Address of Reporting Person Ferguson II, John T. 199 Benson Road Middlebury, CT 06749 USA 2. Issuer Name and Ticker or Trading Symbol Crompton Corporation 3. IRS or Social Security Number of Reporting Person (Voluntary) 4. Statement for Month/Day/Year 01/21/2003 5. If Amendment, Date of Original (Month/Day/Year) 6. Relationship of Reporting Person(s) to Issuer (Check all applicable) ( ) Director ( ) 10% Owner (X) Officer (give title below) ( ) Other (specify below) Senior V.P. & General Counsel 7. 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 |2. Trans- |2A.Execu- |3. Trans-|4. Securities Acquired (A)|5. Amount of |6. Owner- |7. Nature | | | action | action | action| or Disposed of (D) |Securities | ship | of In- | | | Date | Date | Code | |Beneficially | Form: | direct | | | | | | |Owned | Direct | Bene- | | | (Month/ | (Month/ | | |Following | (D) or | ficial | | | Day/ | Day/ +-----+---+-----------+---+----------+Reported | Indirect| Owner- | | | Year) | Year) |Code |V |Amount |A/D|Price |Transaction(s)| (I) | ship | +------------------------------+----------+----------+-----+---+-----------+---+----------+--------------+-----------+------------+ Common Stock 47841 D Common Stock 0 I ESOP TRUST Common Stock 24149 I BEP TRUST Common Stock 8532.54 I LTIP TRUST (1988) TABLE II -- Derivative Securities Acquired, Disposed of, or Beneficially Owned +----------+--------+-------+-------+---------+-----------+---------------------+----------------+----------+-------+-------+------+ |1. |2. |3. |3A. |4. |5. |6. |7. |8. |9. |10. |11. | | | | | | | | | | |Number |Owner- | | | | | | | | | | | |of |ship | | | | | | | | | | | |Deriv- |Form of| | | | | | | | | |Title and Amount| |ative |Deriv- | | | | | | | | | |of Underlying | |Secur- |ative |Nature| | |Conver- |Trans- |Execu- | |Number of | |Securities | |ities |Secur- |of | | |sion or |action |tion | |Derivative |Date Exercisable +-------+--------+ |Benefi-|ity: |In- | | |Exercise|Date |Date | |Securities |and Expiration Date | |Amount | |cially |Direct |direct| | |Price of| | |Transac- |Acquired(A)|(Month/Day/Year) | |or | |Owned |(D) or |Bene- | |Title of |Deriv- |(Month/|(Month/|tion Code|Disposed(D)+----------+----------+ |Number |Price of | |In- |ficial| |Derivative|ative | Day/ | Day/ +------+--+-----+-----+Date Exer-|Expira- | |of |Derivative| |direct |Owner-| |Security |Security|Year) |Year) |Code |V |(A) |(D) |cisable |tion Date |Title |Shares |Security | |(I) |ship | +----------+--------+-------+-------+------+--+-----+-----+----------+----------+-------+--------+----------+-------+-------+------+ NQ Stock $6.38 01/21/2 A43654 01/21/2004 02/20/2013 Common 43654 $0.0000 43654 D Option 003 Stock (Right to Buy) NQ Stock $7.25 11/21/2012 Common 36207 D Option Stock (Right to Buy) NQ Stock $7.92 11/22/2011 Common 47374 D Option Stock (Right to Buy) NQ Stock $8.1562 11/30/2010 Common 75000 D Option Stock (Right to Buy) NQ Stock $8.3437 11/19/2009 Common 188015 D Option Stock (Right to Buy) NQ Stock $13 11/18/2005 Common 4589 D Option Stock (Right to Buy) NQ Stock $14.3438 11/14/2008 Common 40000 D Option Stock (Right to Buy) NQ Stock $14.5 09/21/2006 Common 70227 D Option Stock (Right to Buy) NQ Stock $14.625 11/19/2004 Common 5685 D Option Stock (Right to Buy) NQ Stock $16.875 11/16/2006 Common 20000 D Option Stock (Right to Buy) NQ Stock $19.3125 11/20/2003 Common 3795 D Option Stock (Right to Buy) NQ Stock $26.4063 11/07/2007 Common 20000 D Option Stock (Right to Buy) ISO Stock $6.38 01/21/2 A 31346 01/21/2005 01/21/2013 Common 31346 $0.0000 31346 D Option 003 Stock (Right to Buy) ISO Stock $7.25 10/22/2012 Common 13793 D Option Stock (Right to Buy) ISO Stock $7.92 10/23/2011 Common 12626 D Option Stock (Right to Buy) ISO Stock $8.3437 10/19/2009 Common 11985 D Option Stock (Right to Buy) ISO Stock $13 10/18/2005 Common 5911 D Option Stock (Right to Buy) ISO Stock $14.5 08/21/2006 Common 29773 D Option Stock (Right to Buy) ISO Stock $14.625 10/19/2004 Common 6815 D Option Stock (Right to Buy) ISO Stock $19.3125 10/20/2003 Common 5705 D Option Stock (Right to Buy) Explanation of Responses: SIGNATURE OF REPORTING PERSON /s/ John T. Ferguson II DATE 01/23/2003 Options will vest as follows: 25,000 on 1/21/2004, 9,327 on 1/21/2005 and 9,327 on 1/21/2006. Options will vest as follows: 15,673 on 1/21/2005 and 15,673 on 1/21/2006.