Investors are taking profits after a strong year in the stock market.
The Standard & Poor's 500 index and the Dow Jones industrial average are both up 14 percent for the year, including dividends, as a result of solid corporate earnings. The Nasdaq composite index, meanwhile, is up about 18 percent for the year after dividends.
That's sending major indexes lower on the final day of trading as investors lock in gains, or sell underperforming stocks to reap a tax benefit.
At the opening, the Dow Jones industrial average is down 12, or 0.1 percent, at 11,557. The Standard & Poor's 500 index is down 1, or 0.1 pecent, at 1,257. The Nasdaq composite index is down 1.5, or 0.1 percent, at 2,661. Treasury prices are rising, sending yields lower.