SECURITIES AND EXCHANGE COMMISSION
                     Washington, D.C.  20549


                            FORM 11-K

(Mark One)

[X]  Annual Report pursuant to Section 15 (d) of the Securities
     Exchange Act of 1934

     For the fiscal year ended December 31, 2002

                               OR

[ ]  Transition report pursuant to Section 15 (d) of the
     Securities Exchange Act of 1934

     For the transition period from ________ to _________

     Commission file number 0-30270

A.   Full title of the Plan and the address of the Plan, if
     different from that of the issuer named below:

                      CROMPTON CORPORATION
                  EMPLOYEE STOCK OWNERSHIP PLAN

B.   Name of issuer of the securities held pursuant to the Plan
     and the address of its principal executive office:

                      Crompton Corporation
                           Benson Road
                 Middlebury, Connecticut  06749


                      CROMPTON CORPORATION
                  EMPLOYEE STOCK OWNERSHIP PLAN

                  Index to Financial Statements


Independent Auditors' Report

Statements of Net Assets Available for Plan Benefits as of
December 31, 2002 and 2001

Statements of Changes in Net Assets Available for Plan Benefits
for the Years Ended December 31, 2002 and 2001

Notes to Financial Statements

Supplemental Schedule:

Schedule H, Line 4i - Schedule of Assets (Held at End of Year)







Signature

Exhibit 23 - Consent of KPMG LLP, Independent Auditors

Exhibit 99.1 - Certification of Vice President and Treasurer and
Senior Vice President, Organization & Administration Pursuant to
18 U.S.C. Section 1350 as Adopted Pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002



                      CROMPTON CORPORATION

                  EMPLOYEE STOCK OWNERSHIP PLAN

         Financial Statements and Supplemental Schedule

                   December 31, 2002 and 2001

           (With Independent Auditors' Report Thereon)



                      CROMPTON CORPORATION
                  EMPLOYEE STOCK OWNERSHIP PLAN





                              INDEX


Independent Auditors' Report


Statements of Net Assets Available for  Plan  Benefits  as  of
December 31, 2002 and 2001


Statements of Changes in Net Assets Available for Plan  Benefits
for the Years Ended
December 31, 2002 and 2001


Notes to Financial Statements



Supplemental Schedule:

Schedule H, Line 4i - Schedule of Assets (Held at End of Year)



                    Independent Auditors' Report


The Board of Directors
Crompton Corporation:

We  have  audited the accompanying statements of net assets available
for   plan  benefits  of  the  Crompton  Corporation  Employee  Stock
Ownership Plan (the "Plan") as of December 31, 2002 and 2001, and the
related  statements  of  changes in net  assets  available  for  plan
benefits  for  the years then ended.  These financial statements  are
the  responsibility of the Plan's management.  Our responsibility  is
to  express  an opinion on these financial statements  based  on  our
audits.

We  conducted  our  audits  in  accordance  with  auditing  standards
generally  accepted in the United States of America.  Those standards
require  that  we  plan  and perform the audit to  obtain  reasonable
assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence
supporting  the amounts and disclosures in the financial  statements.
An  audit also includes assessing the accounting principles used  and
significant  estimates made by management, as well as evaluating  the
overall financial statement presentation.  We believe that our audits
provide a reasonable basis for our opinion.

In  our  opinion, the financial statements referred to above  present
fairly,  in all material respects, the net assets available for  plan
benefits  as  of December 31, 2002 and 2001, and the changes  in  net
assets  available  for  plan benefits for the years  then  ended,  in
conformity  with  accounting principles  generally  accepted  in  the
United States of America.

Our  audits  were performed for the purpose of forming an opinion  on
the  basic  financial statements taken as a whole.  The  supplemental
schedule of assets (held at end of year) is presented for the purpose
of  additional  analysis  and is not a required  part  of  the  basic
financial statements but is supplementary information required by the
Department  of  Labor's  Rules  and  Regulations  for  Reporting  and
Disclosure under the Employee Retirement Income Security Act of 1974.
This  supplemental  schedule  is the  responsibility  of  the  Plan's
management.   The  supplemental schedule has been  subjected  to  the
auditing  procedures  applied in the audits of  the  basic  financial
statements  and,  in our opinion, is fairly stated  in  all  material
respects  in relation to the basic financial statements  taken  as  a
whole.



/s/KPMG LLP
Stamford, Connecticut
June 20, 2003





                      CROMPTON CORPORATION
                  EMPLOYEE STOCK OWNERSHIP PLAN

      Statements of Net Assets Available for Plan Benefits

                   December 31, 2002 and 2001

                                            2002          2001
   Investments, at fair value:
    Common stock of Crompton            $14,989,723    $24,362,058
     Corporation
    Fixed Income Fund                    12,019,047     12,071,789

    Mutual Funds                         14,393,489     18,242,752

   Contributions receivable from            332,966        333,454
    participants
   Contribution receivable from             214,614        231,246
    Crompton Corporation

       Net assets available for plan    $41,949,839    $55,241,299
                 benefits


   See accompanying notes to financial statements.



                     CROMPTON CORPORATION
                 EMPLOYEE STOCK OWNERSHIP PLAN

Statements of Changes In Net Assets Available for Plan Benefits

                  December 31, 2002 and 2001

                                            2002          2001


  Additions to net assets attributed to:
    Interest and dividends               $   793,940    $ 1,426,720

    Contributions:
       Participant rollovers                       -         37,881
       Participants                        4,397,318      5,217,557
       Employer                            2,906,735      3,378,177

         Total additions                   8,097,993     10,060,335



  Deductions from net assets attributed to:

    Net depreciation in fair value of    (10,920,025)    (5,354,656)
     investments
    Withdrawals and distributions        (10,410,114)    (8,150,844)

    Administrative expenses                  (59,314)       (36,136)
         Total deductions                (21,389,453)   (13,541,636)

  Net decrease                           (13,291,460)    (3,481,301)

Net assets available for plan benefits at
 the beginning of the year                55,241,299     58,722,600

  Net assets available for plan benefits
   at the end of the year                $41,949,839    $55,241,299


See accompanying notes to financial statements.



                      CROMPTON CORPORATION
                  EMPLOYEE STOCK OWNERSHIP PLAN

                  Notes to Financial Statements

                    December 31, 2002 and 2001

1.  Basis of Presentation
    The  accompanying financial statements have been prepared  on
    the  accrual basis of accounting and present the  net  assets
    available for plan benefits and changes in those net assets.

2.  Plan Description
    The  Employee Stock Purchase and Savings Plan was adopted  by
    the   Board   of  Directors  of  Crompton  Corporation   (the
    "Company") on January 27, 1976.  Effective July 1, 1989,  the
    Board  of  Directors amended the Plan to convert it  into  an
    Employee  Stock Ownership Plan (the "Plan").   The  following
    description  of  the Plan provides only general  information.
    For complete information see the Plan document.  The Plan  is
    a  defined contribution plan and is subject to the provisions
    of  the  Employee Retirement Income Security Act of 1974,  as
    amended (ERISA).

    The  Plan  is administered by the Employee Benefits Committee
    consisting of persons appointed by the Board of Directors  of
    the Company.

    Beginning in 2001, Fidelity Investments(R) (the "Trustee") was
    selected  by the Company as custodial trustee for a  majority
    of  the  Plan  assets.  Prior to 2001,  Fleet  Bank  was  the
    custodial  trustee  of the Plan.  The Trustee  has  custodial
    responsibility  for a trust fund on behalf of  the  Plan  and
    maintains accounting records for all Plan assets.

    Eligibility
    Employees  of  participating affiliates of  the  Company  are
    eligible  to participate upon  having worked for at  least  a
    thirty (30) consecutive day period of employment.

    Contributions and Vesting
    The Plan permits an eligible employee to elect to participate
    by  authorizing a withholding of an amount equal to  1%,  2%,
    3%, 4%, 5% or 6% of compensation as the basic contribution to
    the  Plan.  Contributions by the Company to the Plan are made
    at   an  amount  equal  to  66  2/3%  of  each  participating
    employee's  basic  employee contribution  to  the  Plan.   If
    participants   are  not  eligible  for  any   other   defined
    contribution  plan, additional employee contributions  in  1%
    increments  up  to  10%  of  compensation  can  be  made   as
    supplemental  employee  contributions. Supplemental  employee
    contributions   are   not  eligible  for   matching   Company
    contributions.

    A  participant  in  the Plan is fully vested  in  his  basic,
    supplemental    and    rollover   contributions.     Employer
    contributions vest 100% over a four-year period at a rate  of
    25% per year of service. Any amounts forfeited under the Plan
    are accumulated and used to reduce Company contributions.  At
    December  31,  2002,  forfeited  non-vested  amounts  totaled
    $75,740,  and  at  December  2001 forfeited  non-vested
    accounts totaled $71,433.

    Withdrawals/Benefit Payments
    Upon termination, death, or retiring, a participant's account
    shall be distributed.  However, funds can remain in the  Plan
    after  retirement  indefinitely  with  quarterly  withdrawals
    permitted and as long as funds begin to be distributed  after
    the participant reaches the age of 70 1/2.

    A  participant may elect to make one withdrawal of his  basic
    or   supplemental   contributions  in  a   12-month   period.
    Withdrawal of basic contributions will cause a suspension  of
    contributions for a three-month period.  A participant who is
    fully  vested  and  has  withdrawn  all  of  his  basic   and
    supplemental contributions may also elect to withdraw all  or
    part  of  his employer contributions.  Withdrawal of employer
    contributions  will result in a suspension  of  contributions
    for a six-month period.

    The Plan does not allow for participant loans.

    Investments Options
    The  Company's  contribution to the Plan is invested  in  the
    Crompton  Corporation Common Stock Fund.  The  Plan  provides
    for  investment  of employee contributions  in  the  Crompton
    Corporation  Stock  Fund and among various  investment  funds
    maintained  by  Fidelity  Investments  and  Fleet  Investment
    Management.

    Each  participant  is permitted to elect to  have  his  basic
    contribution invested in any of the funds in 1% increments.

    Fund  transfers can be made on a daily basis in a minimum  of
    1% increments.

3.  Summary of Accounting Policies
    Use of Estimates
    The  preparation  of financial statements in conformity  with
    accounting principles generally accepted in the United States
    of   America   requires  the  Plan  to  make  estimates   and
    assumptions  that affect the reported amounts of  assets  and
    liabilities   and   disclosure  of  contingent   assets   and
    liabilities at the date of the financial statements  and  the
    reported  changes in net assets available for  plan  benefits
    during  the  reporting period.  Actual results  could  differ
    from those estimates.

    Investment Valuation and Income Recognition
    The  Plan's  investments are stated at fair value except  for
    the  benefit-responsive investment contract, which is  valued
    at contract-value (Note 5).  Quoted market prices are used to
    value investments.  Shares of mutual funds are valued at  the
    net  asset value of shares held by the Plan at year-end.  The
    Crompton Corporation Common Stock Fund is valued at its year-
    end closing price.

    Net  appreciation (depreciation) in fair value of investments
    includes  investments bought and sold  and  held  during  the
    year.   Purchases and sales of securities are recorded  on  a
    trade-date basis.  Interest income is recorded on an  accrual
    basis and dividends are recorded on the ex-dividend date.

    Payment of Benefits
    Benefits are recorded when paid.

    Plan Expenses
    Plan expenses may be paid by the Company, however if not paid
    by  the  Company,  may be charged to the Plan.   The  Company
    provides administrative and accounting services for the  Plan
    at no charge.

4.  Investments
    The  Plan's  investments  that  exceeded  5%  of  net  assets
    available for plan benefits as of December 31, 2002 and  2001
    are as follows:
                                           2002          2001
        Crompton  Corporation Common   $14,989,723   $24,362,058
         Stock
        Fidelity Blended Income Fund    12,019,047    12,071,789
        Fidelity Magellan Fund           3,239,041     4,965,324
        Fidelity  U.S. Equity Index      2,299,620     2,886,325
         Commingled Fund
        Fidelity Freedom 2010            2,253,476     2,662,243

    During  2002  and  2001,  the Plan's  investments  (including
    gains  and losses on investments bought and sold, as well  as
    held during the year) depreciated in value as follows:

                                           2002          2001
        Mutual Funds                  ($4,238,475)  ($2,241,222)
        Common Stock of Crompton       (6,681,550)   (3,113,434)
         Corporation
                                      ($10,920,025) ($5,354,656)

5. Investment Contracts with Insurance Company
   The   Fidelity  Blended  Income  Fund  invests   in   benefit-
   responsive  guaranteed investment contracts  ("GICs")  offered
   by  major  insurance  companies and other  approved  financial
   institutions and in certain types of fixed income  securities.
   These  GICs  are  stated at contract value, as  determined  by
   Fidelity, which approximates fair value. The average yield  on
   the  Company's  GICs  was 5.18% and 5.93%,  respectively,  for
   2002 and 2001.  The crediting interest rate on these GICs  was
   4.69% and 2.43%, respectively, at December 31, 2002 and 2001.

6.  Income Taxes
    The  Internal Revenue Service ("IRS") has determined and  has
    informed  the  Company by a letter dated November  16,  1994,
    that  the  Plan and related trust are designed in  accordance
    with   applicable  sections  of  the  Internal  Revenue  Code
    ("IRC").   The  Plan  has been amended  since  receiving  the
    determination  letter.  However, the Plan  administrator  and
    the  Plan's tax counsel believe that the Plan is designed and
    is currently being operated in compliance with the applicable
    requirements  of the IRC.  The Company received  a  favorable
    tax  determination  letter effective October 30, 2002,  which
    stated  that  the Plan and related trust are  designed  in
    accordance with the applicable sections of the IRC.

7.  Party-in-Interest Transactions
    In 2002, Fidelity Investments and the Company are parties-in-
    interest  as  defined in Section 3 (14) of  ERISA.   In  2001,
    Fidelity  Investments(R),  Fleet Bank  and  the  Company  are
    parties-in-interest as defined in Section 3  (14)  of  ERISA.
    During  the  years  2002 and 2001, there were  no  prohibited
    party-in-interest transactions.

8.  Priorities Upon Termination of the Plan
    The  Board  of Directors of the Company shall have the  right
    from  time  to time to add to, modify or amend the Plan,  and
    the  Board of Directors shall have the right to terminate the
    Plan.   The  Board  of  Directors  may  also  authorize   the
    inclusion  in  any contract entered into by the Company  with
    the union or unions representing employees, or with any group
    or  groups of employees, of a provision or provisions  having
    the   effect  of  limiting  or  foregoing  any  such  rights.
    Further,   no   addition  to,  modification,   amendment   or
    termination of the Plan shall have the effect of reducing the
    entitlement of any participant benefit accrued under the Plan
    or  of diverting any part of the assets of the Trust Fund for
    purposes other than provided in the Plan.

    Upon  termination  of the Plan, or a complete  and  permanent
    discontinuance  of  contributions of  all  participants,  the
    value  of  each  participant account, if not already  vested,
    shall vest fully and all amounts remaining in all participant
    accounts  shall be delivered and paid as soon as  practicable
    in accordance with the Plan Document.


                                              Schedule H, Line 4i
                      CROMPTON CORPORATION
                  EMPLOYEE STOCK OWNERSHIP PLAN

            Schedule of Assets (Held at End-of-Year)

                          December 31, 2002

                      Description of Investment
       Identity of    Including Maturity Date,
       Issue,         Rate of Interest,                 Current
       Borrower,      Collateral, Par or Maturity        Value
       Lessor or      Value
       Similar
       Party

       * Crompton     Common Stock                   $14,989,723
         Corporation

       * Fidelity     Blended Income Fund             12,019,047

       * Fidelity     Fidelity Magellan Fund           3,239,041

       * Fidelity     U.S. Equity Index Commingled     2,299,620
                       Fund

       * Fidelity     Fidelity Freedom 2010            2,253,476

       * Fidelity     Fidelity Growth Company Fund     1,822,733

        Dreyfus       Dreyfus Small Company Fund       1,188,887

        Dreyfus       Dreyfus Premium Core Bond        1,119,197

        Putnam        Putnam Int'l Growth Fund A       1,002,943
        Investments

       * Fidelity     MSIFT Equity Fund                  467,983

       * Fidelity     Fidelity Freedom 2020              226,318

       * Fidelity     Dodge & Cox Stock                  524,500

       * Fidelity     Fidelity Freedom 2030               69,531

       * Fidelity     Fidelity Freedom Income             52,034

        Dreyfus       Dreyfus Founders Discovery A        86,934

       * Fidelity     Fidelity Freedom 2040               11,182

       * Fidelity     Fidelity Freedom 2000               29,110

                             TOTAL INVESTMENTS       $41,402,259


* Denotes a party-in-interest to the Plan
 See accompanying independent auditors' report



                             SIGNATURE




     The Plan.  Pursuant to the requirements of the Securities
and Exchange Act of 1934, the trustees (or other persons who
administer the employee benefit plan) have duly caused this
annual report to be signed on its behalf by the undersigned
hereunto duly authorized.



                      CROMPTON CORPORATION
                  EMPLOYEE STOCK OWNERSHIP PLAN





Date:  June 20, 2003       By:/s/Peter Barna
                                 Peter Barna
                                 Senior Vice President &
                                 Chief Financial Officer