Alphabet oversees more than $2.5 billion of invested assets. In the March quarter, it dumped shares of two of its largest holdings and nearly quadrupled its stake in a fast-growing artificial intelligence (AI) stock.Once every quarter, institutional money managers with more than$100 million in assets under management are required to file Form 13F with the Securities and Exchange Commission. A 13F provides an under-the-hood look at what Wall Street's brightest investment minds have been buying and selling i ...