Pfizer, Drug Stocks Leading S&P 500 on Pricing Deal with White HouseStock Market News From Sept. 30, 2025: Dow Hits New RecordLast Updated:7 hours agoPharmaceutical stocks were giving the market a big boost on Tuesday.Merck was the top S&P 500 stock, while Pfizer was also among the leaders. The S&P 500 health care sector overall was up 1.6%, well above the other major sectors. The second-best sector was consumer staples, up just 0.4%.President Donald Trump said Tuesday that Pfizer will lower prices for drugs sold into the Medicaid system. He said it will also launch new drugs in the U.S. at lower prices to match other wealthy nations.