The S&P 500 was down 0.02% to 1,612.92 in afternoon trading Friday.
The Dow Jones industrial average was off 0.29% to 14,980.21, while the Nasdaq was up 0.25% to 3,410.21.
The yield on a 10-year Treasury bond rose 1.37% to 2.52%.
The price of gold was up 0.30% to $1,215 per ounce.
Anaheim-based Pacific Sunwear of California Inc. rose about 10% to $3.66, a day after analysts at Wedbush Securities upgraded the company's stock from "neutral" to "outperform." Pacific Sunwear had a recent market value of $250.36 million.
Irvine-based Endologix Inc. was up about 3% to $13.49 for a market value of $846.83 million.
Medical device companies were generally mixed in afternoon trading.