X0306 4 2016-11-08 false 0000051143 INTERNATIONAL BUSINESS MACHINES CORP IBM 0001576105 Rosamilia Thomas W IBM CORPORATION 294 ROUTE 100 SOMERS NY 10589 false true false false Senior Vice President Phantom Stock Unit 0.00 2016-11-08 4 A false 152.00 0.00 A Common Stock 152.00 16912.00 D Phantom stock units convert to the cash value of the company's common stock on a one-for-one basis. Acquisition of phantom stock units under the IBM Excess 401(k) Plus Plan. Distribution of phantom stock units under the IBM Excess 401(k) Plus Plan is deferred until separation from the company. The reporting person may transfer these phantom stock units into an alternative investment account under such plan. A. Gomes da Silva on behalf of T. W. Rosamilia 2016-11-09