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Board and shareholders

The company's 15-member board of directors are responsible for overall corporate management and includes the current or former CEOs of Anthem, Dow Chemical, Johnson and Johnson, Royal Dutch Shell, UPS, and Vanguard as well as the president of Cornell University and a retired U.S. Navy admiral. Vanguard Group is the largest shareholder of IBM and as of March 31, 2023, held 15.7% of total shares outstanding.

In 2011, IBM became the first technology company Warren Buffett 's holding company Berkshire Hathaway invested in. Initially he bought 64 million shares costing $10.5 billion. Over the years, Buffett increased his IBM holdings, but by the end of 2017 had reduced them by 94.5% to 2.05 million shares; by May 2018, he was completely out of IBM.