US STOCKS-Wall St flat after six-day gain, homebuilders rally
* Homebuilders rally after existing home sales data
* Wisconsin Energy to buy Integrys for $9.1 bln
* ParkerVision plummets on its heaviest-ever volume
* Indexes down: Dow 0.2 pct, S&P 0.1 pct, Nasdaq flat (Updates to midday trading)
By Ryan Vlastelica
NEW YORK, June 23 (Reuters) - U.S. stocks fell slightly on Monday as investors found few reasons to keep buying following a six-day rally in the S&P 500, though homebuilders rallied on strong sales data.
The S&P is coming off its longest streak of advances since mid-April, and both it and the Dow closed at records on Friday. While Wall Street's uptrend is still viewed as intact, signs of mixed global economic growth could constrain further gains.
Financial data firm Markit's Composite Purchasing Managers' Index for the euro zone fell more than expected, though the HSBC/Markit Flash China Manufacturing Purchasing Managers' Index rose into expansion territory for the first time in six months.
U.S. data was positive, with May existing home sales rising 4.9 percent, more than twice the rate of growth that had been expected, while a preliminary read on June manufacturing rose more than expected to its highest since May 2010, according to financial data firm Markit. Continuación...