X0202 5 2005-12-31 1 0 0 0001091862 Chemtura CORP CEM 0001192153 RUCK WALTER K 199 BENSON ROAD MIDDLEBURY CT 06749 0 1 0 0 Former SVP Euro, Africa & M.D. Common Stock 86505 D ISO Stock Option (Right to Buy) 5.85 2004-10-20 2003-10-19 Common Stock 735 735 D ISO Stock Option (Right to Buy) 6.38 2004-01-21 2013-01-21 Common Stock 15000 15000 D ISO Stock Option (Right to Buy) 26.4063 1999-08-04 2007-10-07 Common Stock 4278 4278 D NQ Stock Option (Right to Buy) 5.85 2004-10-20 2013-11-19 Common Stock 19265 19265 D NQ Stock Option (Right to Buy) 6.38 2004-01-21 2013-02-20 Common Stock 10690 10690 D NQ Stock Option (Right to Buy) 7.25 2003-10-22 2012-11-21 Common Stock 9863 9863 D NQ Stock Option (Right to Buy) 7.92 2002-10-23 2011-11-22 Common Stock 12500 12500 D NQ Stock Option (Right to Buy) 8.1562 2001-10-31 2010-11-30 Common Stock 30000 30000 D NQ Stock Option (Right to Buy) 8.343 2000-10-19 2009-11-19 Common Stock 81244 81244 D NQ Stock Option (Right to Buy) 26.4063 1999-08-04 2007-11-07 Common Stock 10722 10722 D Walter K. Ruck 2006-02-06