X0306 4 2015-12-30 false 0000051143 INTERNATIONAL BUSINESS MACHINES CORP IBM 0001180452 KELLY JOHN E III IBM CORPORATION P.O. BOX 218 YORKTOWN HEIGHTS NY 10598 false true false false Senior Vice President Rst. Stock Unit 0.00 2015-12-30 4 A false 55922.00 0.00 A Common Stock 55922.00 55922.00 D These units (retention restricted stock units) are payable in cash or the company's common stock upon lapse of the restrictions. The restrictions lapse for 27,961 of these units on December 30, 2017, for 13,980 units on December 30, 2018 and the restrictions lapse for the remaining 13,981 of these units on December 30, 2019. M. Clemens on behalf of J. E. Kelly III 2015-12-31