Warren Buffett’s Berkshire Hathaway disclosed a new stake of slightly more than five million UnitedHealth Group shares, valued at about $1.6 billion, in its latest quarterly 13F filing. The conglomerate also revealed fresh positions in steelmaker Nucor and homebuilders Lennar and DR Horton, while trimming long-standing holdings in Apple and Bank of America. News of the investment sent UnitedHealth up roughly 12 percent on Friday—its largest single-day advance since March 2020—after a year in which the health-insurer’s stock had fallen nearly 40 percent amid a federal probe and weakening results. The rally helped the price-weighted Dow Jones Industrial Average touch an intraday record and close 0.10 percent higher at 44,955.09, even as the S&P 500 and Nasdaq finished lower. Homebuilders followed suit, with Lennar rising about 3 percent and DR Horton almost 3 percent in early trading, reflecting investors’ read-through from Berkshire’s bets on the housing sector. Steelmaker Nucor also gained after the filing became public. Berkshire’s move into UnitedHealth was echoed by hedge-fund managers Michael Burry and David Tepper, whose latest regulatory reports show new or enlarged positions in the insurer. The confluence of high-profile buying appeared to ease concerns over regulatory headwinds and surging medical-cost trends that had weighed on the stock.