According to @StockMKTNewz, multiple marquee investors including Warren Buffett and Bill Ackman updated their portfolios this week, with a thread outlining their largest holdings as of the end of Q3 2025 (source: @StockMKTNewz, Nov 16, 2025). According to @StockMKTNewz, the thread begins with Berkshire Hathaway’s positions, providing a snapshot of where major institutional capital was concentrated at Q3-end for trading reference (source: @StockMKTNewz). According to the U.S. SEC, quarterly equity holdings by qualifying managers are disclosed on Form 13F up to 45 days after quarter-end, offering traders a standardized view into institutional long positions for the prior quarter (source: U.S. SEC, Form 13F).