X0306 4 2018-11-02 false 0000051143 INTERNATIONAL BUSINESS MACHINES CORP IBM 0001333712 Rometty Virginia M IBM CORPORATION ONE NEW ORCHARD ROAD ARMONK NY 10504 true true false false Chairman, Pres. and CEO Common Stock 2018-11-02 4 P false 8500.00 117.51 A 174030.6661 I trust 2 Common Stock 11367.8311 D Common Stock 66500.00 I trust 1 Phantom Stock Unit 0.00 2018-11-02 4 I false 17291.00 115.67 A Common Stock 17291.00 34804.00 D The reporting person disclaims beneficial ownership of the securities, and this report shall not be deemed an admission that the reporting person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose. Phantom stock units convert to the cash value of the company's common stock on a one-for-one basis. Intra-plan transfer into the IBM Stock Fund of 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 account under such plan. M. Clemens on behalf of V. M. Rometty 2018-11-05