The S&P 500 was up 0.1% in midday trading to 2,547.93.
The Dow Jones Industrial Average climbed 0.3% to 22,819.94.
The NASDAQ was unchanged at 6,580.18.
The yield on a 10-year Treasury bond fell 1% to 2.34%.
The price of gold rose 0.6% to $1,293.
Irvine-based Endologix Inc. (Nasdaq: ELGX) declined 3.8% to $5.28 and a $441 million market cap. Shares are still up about 24% since Sept. 21, when it announced European approval of aneurysm sealing system Nellix.
Acacia Research Corp. (Nasdaq: ACTG) of Newport Beach climbed 4.3% to $4.28 and a $367 million market cap. The patent licenser has a significant investment in Costa Mesa-based Veritone Inc., which was up 1.6% today.