This S&P 500 Stock Soared While the Market Plunged. Is It Still a Buy Now?

Roughly four out of five S&P 500 (^GSPC 9.52%) stocks are in negative territory in 2025. Most of those stocks weren't immune to the meltdown that occurred in recent days following President Trump's "Liberation Day" announcement of steep reciprocal tariffs. However, most doesn't mean all. At least one S&P 500 stock soared as the market plunged. What is this outlier -- and is it still a smart pick to buy?Going against the grainUnitedHealth Group (UNH 4.73%) has delivered a solid gain this year. Shares of the ...