The S&P 500 was flat in midday trading at 2,438.85.
The Dow Jones Industrial Average was flat at 21,200.71.
The NASDAQ fell 0.1% to 6,302.27.
The yield on a 10-year Treasury bond was flat at 2.17%.
The price of gold rose 0.2% to $1,283.
Irvine-based Endologix Inc. fell 4.9% to $4.71 and a $390 million market cap. Shares in the device maker have dropped 30% since May 18 after it said FDA guidance on clinical study results would delay possible approval for a development-stage product in the U.S.
Boot Barn Holdings Inc. in Irvine climbed 2.5% to $6.13 and a $163 million market cap. Shares of the western wear retailer fell 19% on June 2 after it missed expectations on its quarterly report.