X0306 4 2015-10-22 false 0000051143 INTERNATIONAL BUSINESS MACHINES CORP IBM 0001538976 Di Leo Allen Bruno V IBM CORPORATION ONE NORTH CASTLE DRIVE ARMONK NY 10504 false true false false Senior Vice President Common Stock 2015-10-22 4 S false 295.00 143.33 D 32250.302 D Common Stock 2015-10-22 4 S false 405.00 143.34 D 31845.302 D Common Stock 2015-10-22 4 S false 100.00 143.35 D 31745.302 D Common Stock 2015-10-22 4 S false 1200.00 143.37 D 30545.302 D Common Stock 2015-10-22 4 S false 1200.00 143.39 D 29345.302 D Common Stock 2015-10-22 4 S false 800.00 143.40 D 28545.302 D Common Stock 2015-10-22 4 S false 900.00 143.41 D 27645.302 D Common Stock 2015-10-22 4 S false 1200.00 143.42 D 26445.302 D Common Stock 2015-10-22 4 S false 400.00 143.43 D 26045.302 D Common Stock 2015-10-22 4 S false 100.00 143.44 D 25945.302 D Common Stock 2015-10-22 4 S false 300.00 143.45 D 25645.302 D Common Stock 2015-10-22 4 S false 400.00 143.46 D 25245.302 D Common Stock 2015-10-22 4 S false 300.00 143.47 D 24945.302 D Common Stock 2015-10-22 4 S false 400.00 143.48 D 24545.302 D Common Stock 2015-10-22 4 S false 800.00 143.495 D 23745.302 D Common Stock 2015-10-22 4 S false 773.00 143.50 D 22972.302 D Common Stock 2015-10-22 4 S false 3627.00 143.51 D 19345.302 D Common Stock 2015-10-22 4 S false 900.00 143.52 D 18445.302 D Common Stock 2015-10-22 4 S false 100.00 143.53 D 18345.302 D Common Stock 2015-10-22 4 S false 2300.00 143.54 D 16045.302 D Common Stock 2015-10-22 4 S false 100.00 143.56 D 15945.302 D Common Stock 2015-10-22 4 S false 200.00 143.58 D 15745.302 D Common Stock 2015-10-22 4 S false 700.00 143.59 D 15045.302 D Common Stock 2015-10-22 4 S false 300.00 143.60 D 14745.302 D Common Stock 2015-10-22 4 S false 100.00 143.62 D 14645.302 D Common Stock 2015-10-22 4 S false 500.00 143.63 D 14145.302 D Common Stock 2015-10-22 4 S false 100.00 143.65 D 14045.302 D Phantom Stock Unit 0.00 2015-10-22 4 I false 11969.00 144.09 A Common Stock 11969.00 11969.00 D The transactions reported above consist of a disposition of 18,500 shares of Common Stock and an intra-plan transfer under the IBM Excess 401(k) Plus Plan of 11,969 phantom stock units into the IBM Stock Fund. Phantom stock units convert to the cash value of the company's common stock on a one-for-one basis. Intra-plan transfer 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. M. Clemens on behalf of B. V. Di Leo Allen 2015-10-23