Falling commodity prices punished materials and energy companies Wednesday, pushing Wall Street’s major stock indexes to a lower close.

Crude oil lost nearly $2 to $105 a barrel, hurting energy stocks. Peabody Energy fell 3.4 percent, Chevron 1.1 percent and Exxon 0.9 percent.

Materials fell the most among the 10 industry groups in the Standard & Poor’s 500 index. Aluminum producer Alcoa fell 2.6 percent. The only stock in the Dow Jones industrial average that lost more was heavy equipment maker Caterpillar, which dropped 3.5 percent.

All three major indexes lost a half-percent. The Dow closed down 71.52 points at 13,126.21. The broader S&P 500 index lost 6.98 to 1,405.54. The Nasdaq composite index, heavy with technology stocks, fell 15.39 to 3,104.96.

One bright spot was the strong debut of Annie’s, a company that sells prepared organic foods.

In its first day of trading on the New York Stock Exchange, Annie’s leaped 89 percent to $35.92. The company, based in Berkeley, Calif., had priced its shares at $19 late Tuesday.