Energy stocks lead US market lower

Investors are also waiting for the outcome of a vote in Greece that will determine whether the Mediterranean nation will accept austerity measures in exchange for more loans from its creditors.

The Standard & Poor's 500 index eased one point to close at 2,107 Wednesday. The Dow Jones industrial average edged down three points to 18,050. The Nasdaq composite slipped five points to 5,098.

Energy companies fell the most among the 10 industry groups in the S&P 500 index.

U.S. crude dipped $1.63, or 3 percent, to close at $51.41 a barrel in New York. A report on supplies showed a smaller-than-expected decline last week.