* Core U.S. retail sales rise 0.5 percent in April
* Yum Brands falls as monthly Chinese sales drop
* Indexes: Dow down 0.2 pct, S&P flat, Nasdaq up 0.1 pct
By Caroline Valetkevitch
NEW YORK, May 13 (Reuters) - U.S. stocks ended flat on Monday, pausing after hitting record highs last week, but strength in healthcare issues helped to keep declines in check.
The S&P 500 healthcare sector climbed 0.7 percent and was the day's best performer.
Shares of Theravance jumped 17.9 percent to $41.20 after Irish drugmaker Elan agreed to a $1 billion deal to buy 21 percent of the royalties that Theravance receives from GlaxoSmithKline for its respiratory drugs.
The day's flat activity follows a third straight week of gains on the major indexes, with both the Dow and S&P 500 setting record closing highs last week. The S&P 500 remains up 14.5 percent for the year so far.
While some analysts argue the long-term trend is still higher, many see momentum waning in the near term in the absence of positive catalysts. Volume has been lighter than average, and volatility has been low in recent days.
"Intraday volatility has essentially been nonexistent. I think it means people are really sitting on the sidelines right now seeing which way it's going to go," said Uri Landesman, president of Platinum Partners in New York.
The CBOE Volatility index ended down 0.3 percent.
The Dow Jones industrial average was down 26.81 points, or 0.18 percent, at 15,091.68. The Standard & Poor's 500 Index was up 0.07 points at 1,633.77. The Nasdaq Composite Index was up 2.21 points, or 0.06 percent, at 3,438.79.
Among the day's decliners, Yum Brands Inc fell 2 percent to $68.92. After the market closed on Friday, the fast food chain operator posted a steep decline in Chinese April sales.
Helping to limit the market's downside, retail sales rose 0.1 percent in April, better than the 0.3 percent drop that had been expected, and returning to growth following a decline in March. Excluding autos, gasoline and building materials, core sales rose 0.5 percent. Retail sales account for about 30 percent of U.S. consumer spending.
Investors are at odds over whether positive economic data can help the market rise further, or whether it will spell the end of the Federal Reserve's monetary stimulus, which could derail the rally, said Joseph Tanious, global market strategist at J.P. Morgan Funds.
Other data showed business inventories were unchanged in March for a second straight month, versus expectations of 0.3 percent rise, suggesting restocking could help second-quarter economic growth.
Earnings have been mostly better than expected. With 90 percent of the S&P 500 having reported, 67.2 percent of companies have topped earnings expectations, according to Thomson Reuters data, even with the average over the past four quarters. Only 46.9 percent have beaten revenue expectations, below the 52 percent average over the past four quarters.
U.S.-listed shares of Perion Network surged 10.6 percent to $13.94 after the Israeli consumer Internet company posted first-quarter earnings.