If any investor has stood the test of time, it's Warren Buffett, and with good reason. For years, the Oracle of Omaha has had a rock-star-like presence in the investing world, and his annual Berkshire Hathaway shareholders meeting draws thousands of loyal investor fans. Buffett remains one of the world's most prominent investors, known for his long buy-and-hold strategies and massive portfolio of public and private holdings.
Unafraid of concentration risk, Ackman channels billions into select names he believes are undervalued giants, as evidenced by past winners like Chipotle Mexican Grill ( ) and Hilton Worldwide Holdings ( ). His strategy prioritizes quality management and long-term moats over diversification. In the first quarter, he launched a blockbuster stake in Uber Technologies ( ), acquiring 30.3 million shares worth $2.21 billion at the time - now valued at $2.8 billion and comprising 21% of his $13.7 billion portfolio. Yet, he hasn't added since, content with the position amid Uber's rally.