The S&P 500 was up 0.1% in midday trading to 2,672.69.
The Dow Jones Industrial Average was flat at 24,461.09.
The Nasdaq was down 0.1% to 7,142.65.
The yield on a 10-year Treasury bond jumped 1.3% to 2.95%.
The price of gold fell 1% to $1,325.
Irvine-based Endologix Inc. (Nasdaq: ELGX) fell 8.3% to $4.22 and a $353 million market cap. Shares of the maker of endovascular stent grafts are down 21% this year.
GBGI Ltd., (LSI: GBGI) plunged 30% to 78 pence (USD $1.09) and a 97 million-pound market cap (USD $135 million). The provider of insurance for expatriates has its main operations in Foothill Ranch. Yesterday it reported 2017 profit was hurt by a rise in net claims paid and an impairment in its Angola operations.