Wall Street's main indexes opened lower on Monday as climbing Treasury yields and prospects of rising inflation triggered valuation concerns, hitting shares of technology-related companies.
The Dow Jones Industrial Average fell 113.2 points, or 0.36 percent, at the open to 31381.12.
The S&P 500 fell 21.2 points, or 0.54 percent, at the open to 3885.55, while the Nasdaq Composite dropped 160.3 points, or 1.16 percent, to 13714.202 at the opening bell.