X0202 4 2005-07-01 1 0000043362 GREAT LAKES CHEMICAL CORP GLK 0001206285 BRISIMITZAKIS ANGELO C 9025 NORTH RIVER ROAD SUITE 400 INDIANAPOLIS IN 46240 0 1 0 0 Executive Vice President Common 2005-07-01 4 D 0 3986.0000 D 0.00 D Common 2005-07-01 4 D 0 1388.908 D 0.00 I By 401(k) Restricted Stock Units 0.000 2005-07-01 4 D 0 8000.0000 0.000 D 2003-05-03 2010-05-03 Common 8000.0000 0.00 D Restricted Stock Units 0.000 2005-07-01 4 D 0 15000.0000 0.000 D 2006-02-08 2009-02-08 Common 15000.0000 0.00 D Stock Option (Right to Buy) 21.620 2005-07-01 4 D 0 35000.0000 21.620 D 2004-02-11 2013-02-11 Common 35000.0000 0.00 D Stock Option (Right to Buy) 25.030 2005-07-01 4 D 0 35000.0000 25.030 D 2005-02-14 2014-02-14 Common 35000.0000 0.00 D Stock Option (Right to Buy) 31.313 2005-07-01 4 D 0 12500.0000 31.313 D 2001-02-13 2010-02-13 Common 12500.0000 0.00 D Stock Option (Right to Buy) 33.140 2005-07-01 4 D 0 17500.0000 33.140 D 2002-02-11 2011-02-11 Common 17500.0000 0.00 D Stock Option (Right to Buy) 22.000 2005-07-01 4 D 0 30000.0000 22.000 D 2003-02-11 2012-02-11 Common 30000.0000 0.00 D Stock Option (Right to Buy) 35.750 2005-07-01 4 D 0 4000.0000 35.750 D 2000-02-15 2009-02-15 Common 4000.0000 0.00 D Stock Option (Right to Buy) 39.438 2005-07-01 4 D 0 10000.0000 39.438 D 1999-08-03 2008-08-03 Common 10000.0000 0.00 D Disposed of pursuant to the Agreement and Plan of Merger, dated March 8, 2005 (the "Merger Agreement"), by and among Crompton Corporation ("Crompton"), Copernicus Merger Corporation and Great Lakes Chemical Corporation ("Great Lakes") in exchange for 2.2232 shares of Crompton common stock (the "Exchange Ratio") in accordance with the terms of the Merger Agreement having a market value of $14.15 on 6/30/2005. This option, when granted, provided for vesting in 3 equal annual installments beginning on the first anniversary of the grant, and in accordance with its terms will become fully vested upon the consummation of the merger. Pursuant to the Merger Agreement, such options have been assumed by Crompton and will be exercisable for Crompton common stock based on the Exchange Ratio. These securities were held in accordance with Great Lakes 401(k) savings plan and have been assumed by Crompton pursuant to the Exchange Ratio. /s/ Karen Witte Duros 2005-07-01