X0306 4 2015-11-02 0 0001091862 Chemtura CORP CHMT 0001454798 Swiech Alan M 199 BENSON ROAD MIDDLEBURY CT 06749 0 1 0 0 See Remarks Common Stock 2015-11-02 4 M 0 23006 16.03 A 93416 D Common Stock 2015-11-02 4 S 0 23006 31.87 D 70410 D Employee Stock Option (right to buy) 16.03 2015-11-02 4 M 0 23006 0.00 D 2021-03-10 Common Stock 23006 0 D The option exercise and sale reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $31.57 to $32.10, inclusive. The reporting person undertakes to provide Chemtura Corporation, any security holder of Chemtura Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within. This option, which initially represented a right to purchase a total of 46,012 shares (23,006 of which were purchased on October 9, 2015), became exercisable in three equal installments on the date of grant, March 31, 2012 and March 31, 2013. EVP, Organometallics Specialties & Support Services /s/ Alan Schutzman by Power of Attorney 2015-11-04