Updated from 4:11 p.m. ESTStocks ended to the downside after enduring wide swings Friday, a session that was marked by a sales warning from chip giant Intel ( INTC) and a strong showing by the U.S. services sector. The Dow Jones Industrial Average lost 3.92 points, or 0.04%, to close at 11,021.59. The index was as low as 10,985 and as high as 11,107. The S&P 500, which had a 13-point trading band, slipped 1.91 points, or 0.15%, to 1287.23, and the Nasdaq Composite shed 8.51 points, or 0.37%, to 2302.60. "Today was one of the days where everything was negative," said Art Hogan, chief market analyst with Jefferies. "The market did hold in there pretty well, though. We're finishing up the week showing how much volatility we should expect over the next few weeks. We should be pleased we ended up where we did because it could've been a lot worse." About 1.57 billion shares changed hands on the New York Stock Exchange, and volume on the Nasdaq was 2.42 billion shares. Decliners outpaced advancers 9 to 7. Intel was the corporate story of the day. The company reduced its first-quarter revenue estimate to a range of $8.7 billion to $9.1 billion, citing lower-than-expected demand and a slight market-share loss. In January, the semiconductor maker said it expected revenue of $9.1 billion to $9.7 billion, a forecast that at the time was well short of Wall Street's $10 billion consensus estimate. Shares of Intel fell 17 cents, or 0.8%, to close at $20.32. Still, the shares finished above the worst level of the session, having touched a 52-week low of $19.86 during morning trading. For the week, the Dow gave up about 40 points, and the Nasdaq added around 25 points. The S&P lost 2 points, snapping a three-week run of gains.