X0306 4 2019-06-14 false 0000051143 INTERNATIONAL BUSINESS MACHINES CORP IBM 0001604043 KEVERIAN KENNETH M IBM CORPORATION NEW ORCHARD ROAD ARMONK NY 10504 false true false false Senior Vice President Common Stock 2019-06-14 4 S false 2227.00 135.15 D 32877.596 D Common Stock 100.00 I spouse Phantom Stock Unit 0.00 2019-06-14 4 A false 6.00 135.15 A Common Stock 6.00 9432.00 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. 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. D. Condrea on behalf of K. M. Keverian 2019-06-17