Former Microsoft CEO Steve Ballmer's "devices and services" strategy may be in tatters, discarded by his successor, Satya Nadella, but Ballmer must be smiling all the way to the bank. According to U.S. Securities and Exchange (SEC) documents, Ballmer owns more than 333 million shares in Microsoft. At Monday's closing price of $44.83, those shares were valued at $14.9 billion. On the day before Ballmer stepped aside, Microsoft's share price was $36.48, putting his portfolio's worth at just over $12.1 billion. Because of the 23% increase in share value since Feb. 3, Ballmer's Microsoft holdings have appreciated in value by almost $2.8 billion. The "Nadella Effect" -- Wall Street's assumption that the new CEO will turn around Microsoft's fortunes -- has also put more on the ledger sheets of other executives, past and present.