X0202 4 2004-04-29 0 0000275694 MASSMUTUAL CORPORATE INVESTORS MCI 0001194966 OCONNELL ROBERT J MASSMUTUAL FINANCIAL GROUP 1295 STATE STREET SPRINGFIELD MA 011110001 0 0 0 1 Affiliated Person of Adviser MassMutual Non-Qualified Thrift Plan 0.00 2004-04-29 4 A 0 15.58 23.15 A Capital Stock 15.58 58569.56 D Exercisable only upon termination or retirement, however, holdings may be liquidated and invested into other investment options at each month. The derivative has no actual securities underlying the agreement, which is entirely notional. By: Rosemary Baker as Attorney-in-fact for 2004-04-30