Stephen Mandel

Stephen Mandel’s Lone Pine Capital enters 2026 with a concentrated bet on the power and data center complex. The fund’s largest position, Vistra Corp, accounts for 7.4 percent of the portfolio, with Talen Energy also in the top ten. This is a high-conviction wager on electricity demand from artificial intelligence, a theme that separates Lone Pine from growth peers who have leaned into mega-cap software. The fund pairs this with a significant stake in Carpenter Technology, a specialty alloys maker, and Teradyne, a semiconductor test equipment firm, creating a thesis that spans grid infrastructure and advanced manufacturing. The portfolio shows a willingness to hold volatile, idiosyncratic names. Carvana, a stock that has seen extreme price swings, sits in the top ten, as does AppLovin, the mobile ad platform. These are not passive index holdings; they are active bets on companies with large addressable markets and substantial short interest. The inclusion of Nu Holdings and LPL Financial adds a financials tilt, while Medline provides exposure to healthcare supplies. The fund’s total equity value is roughly $12.5 billion, and the top ten positions account for over 51 percent of the portfolio, indicating a high degree of confidence in these specific names. Lone Pine’s style remains classic growth with a cyclical overlay. The fund is not hiding in defensives; it is leaning into the buildout of digital infrastructure and consumer finance. The concentration in Vistra and Carpenter suggests a view that the energy transition and AI buildout are durable, multi-year trends. The fund’s positioning is a clear statement that the market’s next leg is being powered by electrons and the hardware that manages them.