If you purchased or otherwise acquired the securities of Crompton Corporation (“Crompton”) during the period between October 26, 1998 and October 8, 2002, inclusive (the “Class Period”), including without limitation all persons and entities that purchased or otherwise acquired Crompton securities pursuant to the merger between Crompton & Knowles Corporation and Witco Corporation and who were damaged thereby (the “Class”), you could receive a payment from a class action settlement. A MODIFICATION TO THE SETTLEMENT OF THIS CLASS ACTION THAT MAY AFFECT YOU HAS BEEN PROPOSED. PLEASE READ THE NOTICE CAREFULLY AND IN ITS ENTIRETY.

Important Update: The Fairness Hearing was held as scheduled on August 17, 2010, and the Court has granted final approval to the Settlement in connection with this Lawsuit. Accordingly, the Plan of Allocation is approved as fair and reasonable, and Co-Lead Counsel and the Claims Administrator are directed to administer the Settlement in accordance with the terms and provisions of the Amended Stipulation.

The purpose of this website is to inform you of a proposed settlement of a class action lawsuit against Crompton Corporation (“Crompton” or the “Company”) and certain of the Company’s officers and directors. The proposed Settlement consists of $11,357,500 in cash.

A proposed settlement of the class action lawsuit entitled In re Crompton Corp. Securities Litigation, No. 3:03-CV-1293 (EBB) (the “Lawsuit”), in the amount of $20,650,000, was previously publicized in early 2009. Before that settlement was finalized, Chemtura Corporation (“Chemtura”), Crompton’s successor, filed for bankruptcy. As a result, the Lawsuit was stayed pursuant to 11 U.S.C. § 362(a) of the U.S. Bankruptcy Code, and, pursuant to 11 U.S.C. §§ 547 and 550, the contribution to the original settlement made by the Company was returned to it.

Lead Plaintiffs have determined that it is unlikely that renewed litigation against bankrupt Chemtura or the remaining Defendants will result in any increased recovery. Accordingly, Lead Plaintiffs have elected to modify the original settlement of the Lawsuit and have agreed to accept the $11,357,500 Defendants paid or caused to be paid from Chemtura’s Directors & Officers Insurance as full and final satisfaction of this Lawsuit (the “Settlement”). By proceeding with a modified settlement, Chemtura will allow the bankruptcy stay (which could last until the conclusion of Chemtura’s chapter 11 case) to be lifted, and this will enable Class members to receive a recovery more quickly. Please read the Notice for additional information regarding the modified settlement.

Please Note:If you previously submitted a Proof of Claim and Release form (“Proof of Claim”) in connection with the original settlement of this Lawsuit and wish to participate in this Settlement, you do not need to do anything else. Your previously submitted Proof of Claim will be included in connection with the modified settlement. If you have not yet submitted a Proof of Claim but wish to participate in this Settlement, you may still do so in accordance with the instructions set forth in the Notice. If you previously objected to or requested exclusion from the original settlement, you need not re-file your objection or exclusion. If you wish to object to or exclude yourself from this Settlement, you may still do so, even if you previously submitted a Proof of Claim in connection with the original settlement.

You need to decide whether to stay in the Class or exclude yourself. In order to exclude yourself, you must mail your exclusion request so that it is received no later than July 28, 2010.

Click the navigational links above to read the relevant case documents, read frequently asked questions and their answers, submit your claim online, or, if you are a nominee, find information on how to send us mailing lists of your clients, request blank copies of the Notice and Proof of Claim form, or submit electronic claims.

If you have additional questions, you may contact the Claims Administrator by email at questions@cromptonsecuritiessettlement.com or by phone toll-free at 1-866-840-0341.

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