The S&P 500 was down 0.05% to 1,880.20 in afternoon trading Monday.
The Dow Jones Industrial Average fell 0.08% to 16,499.71, while the Nasdaq slipped 0.06% to 4,121.48.
The yield on a 10-Year treasury bond rose 0.42% to 2.60%.
The price of gold was up 0.48% to $1,309.10 per ounce.
Irvine medical device maker Masimo Corp. fell about 2% to $23.17 for a market value of $1.31 billion. The company's shares have fallen about 10% since it reported first-quarter results Wednesday.
Newport Beach specialty chemicals maker American Vanguard Corp. shares bounced back about 4% to $16.05 after closing down about 8%. The company reported a slump in first-quarter revenue and earnings on Thursday. It had a recent market value of $461.28 million.