US Stocks fell moderately today as investors took a break after four weeks of gains that brought the market to record highs.
Energy companies fell more than the rest of the market as the price of oil took another turn lower.
Yahoo fell after Verizon Communications announced it would buy most of Yahoo's internet businesses for 4.83 billion dollars.
The Dow Jones industrial average lost 77.79 points, or 0.4%, to 18,493.06. The Standard & Poor's 500 index lost 6.55 points, or 0.3%, to 2,168.48 and the Nasdaq composite lost 2.53 points, or 0.1%, to 5,097.63.
It is common for a market that has run up quickly to retreat. With the slow summer trading season and lack of economic news, traders say there are few reasons to be buying the market right now.
"This is a broad, but benign, sell-off," said Ryan Larson, head of US equity trading for RBC global asset management.
Mr Larson pointed out the recent price-to-earnings ratio on the S&P 500, or the amount money that investors are paying for each dollar of earnings, which was trading at nearly 20. That's far above the 14-16 times that investors are typically comfortable with.
"It's another reason why the market looks fatigued at the moment," he said.
This week, while heavy on individual company earnings, is light on economic data.
Later this week the Bank of Japan and Federal Reserve will hold policy meetings.
With Japan's economy barely growing, economists are speculating about whether its central bank may push more stimulus, likely lowering its interest rate further into negative territory when it announces its decision on Friday.
The US economy is in better shape than other advanced economies, but expectations are that the Fed will hold interest rates steady and look to raise interest rates later this year.
Securities that bet on which way the Fed will move interest rates show only a 10% chance of a rate increase this week.
The Fed's two-day meeting starts on Tuesday.
Technology companies will dominate quarterly earnings news this week, including results from Apple, Amazon, Google and Facebook. Their reports are also likely to heavily impact trading this week.
In individual company news, Yahoo fell 1.06 dollars, or 2.7%, to 38.32 dollars after the company announced that Verizon would buy Yahoo's advertising, media and email businesses for 4.83 billion dollars, ending a five-month auction. Verizon will add Yahoo to its portfolio of recently purchased media companies, including AOL.
Once finished, Yahoo will be a shell of its former self, existing mainly as a holding company for its Alibaba and Yahoo Japan investments, as well as its patent portfolio. Verizon fell 23 cents, or 0.4%, to 55.87 dollars.
Oil prices continued on their month-long slide. The price of crude fell 1.06 dollars, or 2.4%, to close at 43.13 dollars a barrel. US crude oil is down 12% this month. Brent crude, the global benchmark, dropped 97 cents, or 2.1%, to close at 44.72 dollars a barrel in London.
The 2% drop in oil prices dragged down major energy companies. Chevron lost 2.59 dollars, or 2.5%, to 103.07 dollars and Exxon Mobil gave up 1.81 dollars, or 2%, to 92.20 dollars, the two biggest drops in the Dow Jones industrial average.
In other energy trading, wholesale petrol fell three cents to 1.33 dollars a gallon, heating oil fell 3 cents to 1.32 dollars a gallon and natural gas also fell three cents to close at 2.75 per 1,000 cubic feet.
US government bond prices did not move much. The yield on the 10-year Treasury note held steady at 1.57%. The dollar fell to 105.85 yen from 106.17 yen. The euro rose to 1.0989 dollars from 1.0961.
The price of gold fell 3.90 dollars to 1,319.50 dollars an ounce, silver fell four cents to 19.65 dollars an ounce and copper fell two cents to 2.22 dollars a pound.