By Anora Mahmudova and Barbara Kollmeyer, MarketWatch

NEW YORK (MarketWatch) -- U.S. stocks moved lower on Tuesday as investors digested earnings beats and misses, but kept their attention firmly focused on Apple Inc.'s hotly anticipated product event later in the day.

The S&P 500 (SPX) was 9 points, or 0.5%, at 1,992.24. The Dow Jones Industrial Average (DJI) dropped 94 points, or 0.6%, to 17,018.50 at the open. The Nasdaq Composite (RIXF) lost 18 points, or 0.4%, to 4,573.52.

"The S&P 500 continues to consolidate around the technical resistance level of 2,000 and it could do so for a while," said Randy Frederick, managing director of trading & derivatives at Schwab Center for Financial Research.

"We are also at a juncture where stocks are fairly priced, not too expensive, but not too cheap either. In the absence of earnings news or major economic data, it is not unusual to see sideways moves," he added.

Among economic news, small-business sentiment in August nudged up to its second-highest reading since October 2007, a trade group said Tuesday. July job openings ticked down to 4.67 million from to 4.68 million in June. Also read: Michael Sincere on why this stock market will never go down

Stocks to watch: The iPhone maker (AAPL) will hold its product event at 10 a.m. PDT (1 p.m. Eastern) near its headquarters in Cupertino, Calif. The unveiling of the newest version of its flagship phone and a new iWatch wearable device are among the things that could help boost shares of Apple. Also read: Tim Mullaney on why Apple exemplifies everything that's wrong about Silicon Valley.

McDonald's (MCD) said global comparable sales fell 3.7% in August and blamed "several headwinds" for the decline. The fast-food restaurant chain also warned that problems with a supplier in China will hurt third-quarter results. Also read: The secret to a long life? Fast food

Shares of Annie's Inc.(BNNY) rose 37%, on the heels of a similar late-session rally after General Mills Inc. (GIS) offered to buy the organic-foods company for $820 million in cash.

Shares of Pinnacle Foods Inc.(PF) fell 4.3% after the packaged-foods company said some shareholders tied primarily to investment firm Blackstone will sell 15 million common shares.

Barnes & Noble Inc. (BKS) shares reversed losses made immediately in the wake of the bookseller's quarterly results. They were up 2.6%. Same-store sales fell by more than expected, but the loss was not as large as expected. Read about more of the day's notable stock moves here.

Other markets:The yield on the 10-year Treasurys(10_YEAR) rose 3 basis points to 2.5%, its highest since the beginning of August on a closing basis. Brent crude oil prices held steady at $100 a barrel, while the dollar charted new highs against the yen (USDJPY) and the euro (EURUSD). Europe stocks posted mild losses, while Asia markets saw mostly modest gains.

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