Stock Market Today: Dow Dives 411 Points as UnitedHealth Slumps

Stocks closed lower on Wednesday as market participants took profits following a bull run. In fact, all three major indices are hovering around all-time highs and are poised to close out May with solid gains.

At closing, the Nasdaq Composite fell 0.6% to 16,920 and the S&P 500 fell 0.7% to 5,266. He Dow Jones Industrial Average fell 1.1% to 38,441 as UnitedHealth Group (UNH) fell 3.8% after the health insurer forecast "some disruption" to its Medicaid business. Priced at about $484, UNH stock has the largest weighting of the 30 price-weighted Dow stocks.