UnitedHealth Stock Eyes Best Day Since 2020 on Buffett Stake

Group 1 - UnitedHealth Group Inc shares surged 10.1% to $298.71 following a SEC filing revealing Berkshire Hathaway's stake purchase of approximately 5 million shares for about $1.6 billion [1] - The stock is experiencing its largest daily increase since March 2020, indicating a significant boost in market sentiment [1] - Despite this surge, UnitedHealth has faced several challenges, including rising healthcare costs, Department of Justice investigations, and the death of CEO Brian Thompson, resulting in a 40% decline in 2025 [2] Group 2 - Options trading activity has increased significantly, with 377,000 calls and 121,000 puts exchanged, six times the average daily volume [3] - The most popular options are the expiring August 300, 305, and 310 calls, indicating a bullish sentiment among short-term traders [3] - The Schaeffer's put/call open interest ratio (SOIR) stands at 0.44, placing it in the 5th percentile of readings over the past year, suggesting a strong call bias [3] Group 3 - UnitedHealth's stock has historically outperformed volatility expectations, as indicated by a Schaeffer's Volatility Scorecard (SVS) of 96 out of 100 [4]