X0202 4 2006-01-26 0 0001018952 KOS PHARMACEUTICALS INC KOSP 0001253346 BALDINI ROBERT E 1 0 0 0 Common Stock, $.01 par value 2006-01-26 4 A 0 3950 0 A 17336 D Stock Option (Right to Buy) 44.86 2006-01-26 4 A 0 7900 0 A 2014-01-25 Common Stock 7900 7900 D The grant of restricted stock and stock options was approved by the Compensation and Stock Option Committee of the Board of Directors of Kos Pharmaceuticals, Inc. on January 26, 2006, subject to shareholder approval of an amendment to the Kos Pharmaceuticals, Inc. 1996 Stock Option Plan. One share owned jointly with spouse. Includes 13,385 Kos common stock acquired by the reporting person under the Kos 401(k) plan and the Kos Employee Stock Purchase Plan in transactions exempt under Section 16 of the Exchange Act. The options are exercisable in the following amounts on the following exercise dates: 1,975 on January 26, 2007 1,975 on January 26, 2008 1,975 on January 26, 2009 1,975 on January 26, 2010 Juan F. Rodriguez, Attorney-in-Fact 2006-01-30