The S&P 500 was down 0.2% in midday trading to 2,473.06.
The Dow Jones Industrial Average was up 0.1% to 22,035.12.
The NASDAQ was down 0.3% to 6,344.24.
The yield on a 10-year Treasury bond fell 1% to 2.24%.
The price of gold was down 0.3% to $1,274.
Masimo Corp. (NASDAQ: MASI) in Irvine fell 9% to $87.46 and a $4.5 billion market cap. The patient monitoring device maker beat analyst expectations on revenue and net income and guided full-year results higher, but shares had already risen nearly 60% year-to-date.
Glaukos Corp. (NYSE: GKOS) declined 8% to $36.60 and a $1.3 billion market cap. The eye stent maker lost $3.3 million in its most recent quarter, compared with a net profit year-over-year.
TTM Technologies Inc. (NASDAQ: TTMI) in Costa Mesa was down 18% to $14.15 and a $1.4 billion market cap. The printed circuit board maker missed analyst expectations on revenue, net income, and future guidance.
Habit Restaurants Inc. (NASDAQ: HABT) was down 13% to $13.58 and a $441 million market cap. The fast-casual hamburger chain missed analyst expectations on revenue and said same-store sales were essentially flat.