Bill Ackman Built a $2.4 Billion Stake in Microsoft, Calling It a "Core Holding" Bought at a "Highly Compelling Valuation." Here's Why He's Betting Big on Big Tech.

Earlier this year, Pershing Square (NYSE: PS) founder and CEO Bill Ackman piled into a stock well-known not only to tech investors, but the general public at large: Microsoft (NASDAQ: MSFT). Missed AI's "Act 1"? Act 2 Could Be 15x Bigger. Most investors think they missed the AI boat because they didn't buy Nvidia in 2005. But according to our analysts, we're only at the end of "Act 1"—the R&D phase. "Act 2" is the global rollout. Continue » This demonstrates the famous investor's bullish outlook on the tech sector, as four slots in the company's limited equity portfolio are held by prominent tech names (or at least heavily tech-slanted, in the case of rideshare king Uber Technologies).