Overview

• Berkshire Hathaway disclosed a purchase of more than 5 million UnitedHealth shares at the end of June, making it its 18th-largest holding at roughly $1.6 billion.
• UnitedHealth stock surged up to 14 percent on August 15, marking its best one-day gain since 2008 and driving the Dow Jones to an intraday record.
• The insurer remains under a DOJ investigation into its Medicare billing practices and has pulled 2025 guidance after CEO Andrew Witty’s resignation.
• The UnitedHealth acquisition was part of a broader Q2 rebalancing that included new positions in Nucor, Lamar Advertising, Allegion, Lennar and D.R. Horton alongside reductions in Apple and Bank of America.
• Analysts say Berkshire portfolio managers Todd Combs or Ted Weschler likely executed the trade as Warren Buffett prepares to hand over CEO duties to Greg Abel by year-end.