Since the announcement of his retirement, the value of Ballmer's stake in Microsoft has grown by more than $2 billion. Ballmer announced his retirement on Aug. 23 last year, which immediately sent shares of Microsoft up more than 7%. Ballmer's decade-plus tenure at Microsoft was criticized for a lack of growth in the company's share price, but since the announcement of his retirement, the company's share price has risen more than 23%.
At the time, Ballmer owned about 333 million shares in the company, according to the company's most recent proxy statement. Microsoft traded at $32.39 before the announcement, and closed today at $40.01, meaning his stake had grown by roughly $2.5 billion.
Arguably, it has been more than Ballmer's retirement — the appointment of product-savvy Satya Nadella as CEO, the release of Office for iPad and a number of other strategic and organizational changes — that has sent Microsoft shares on its run. But with Ballmer out of the picture, the value of his own stake in the company has grown dramatically — by enough to buy himself a basketball team.