X0202 4 2005-07-01 1 0000043362 GREAT LAKES CHEMICAL CORP GLK 0001189751 PROOPS JAY D 9025 NORTH RIVER ROAD SUITE 400 INDIANAPOLIS IN 46240 1 0 0 0 Common 2005-07-01 4 D 0 20000.0000 D 0.00 D Common 2005-07-01 4 D 0 22600.0000 D 0.00 I By Family LP Phantom Stock Units 0.000 2005-07-01 4 D 0 2477.0000 0.000 D 2005-07-01 2005-07-01 Common 2477.0000 0.00 D Stock Option (Right to Buy) 22.720 2005-07-01 4 D 0 2750.0000 22.720 D 2003-02-12 2012-02-12 Common 2750.0000 0.00 D Stock Option (Right to Buy) 21.620 2005-07-01 4 D 0 3000.0000 21.620 D 2004-02-11 2013-02-11 Common 3000.0000 0.00 D Stock Option (Right to Buy) 24.460 2005-07-01 4 D 0 3000.0000 24.460 D 2005-05-06 2014-05-06 Common 3000.0000 0.00 D Stock Option (Right to Buy) 31.313 2005-07-01 4 D 0 2750.0000 31.313 D 2001-02-13 2010-02-13 Common 2750.0000 0.00 D Stock Option (Right to Buy) 48.313 2005-07-01 4 D 0 2000.0000 48.313 D 2000-05-05 2009-05-04 Common 2000.0000 0.00 D Stock Option (Right to Buy) 32.000 2005-07-01 4 D 0 2750.0000 32.000 D 2002-05-03 2011-05-03 Common 2750.0000 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. /s/ Karen Witte Duros, Attorney-in-Fact for Jay D. Proops 2005-07-01