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New York - US stocks joined a global equities selloff on Monday as worries about a potential British exit of the European Union overshadowed Microsoft's $26.2bn acquisition of LinkedIn.
Equities on Wall Street fell for the third straight session as polls in Britain showed growing support for Brexit ahead of the June 23 referendum.
LinkedIn surged 46.6% on news it would be acquired in an all-cash deal that will boost Microsoft's presence in social media. Microsoft lost 2.6%.
The Dow Jones Industrial Average lost 0.7% at 17 732.48.
The broad-based S&P 500 fell 0.8% to 2 079.06, while the tech-rich Nasdaq Composite Index dropped 0.9% to 4 848.44.
Apple dropped 1.5% as it opened its annual developer conference in San Francisco by announcing that it plans to expand the role of its Siri artificial intelligence program and to enable the program to interface with non-Apple systems.
Other technology shares were mixed, with Facebook losing 2.3% and biotech Celgene dropping 1.3%. But Twitter, which is sometimes mentioned as a potential acquisition target, rose 3.8%.
Symantec rose 5.3% after announcing it will acquire privately held Blue Coat, which specializes in cloud computing security, for $4.65bn.
Most travel-oriented shares fell, with American Airlines, Delta Air Lines and United Continental all losing at least 3.5%.
Expedia dropped 2.3% and Marriott International shed 0.8%. Travel-oriented stocks frequently suffer after attacks such as Sunday deadly shooting at a gay dance club in Orlando, Florida.
But gun maker Smith & Wesson jumped 6.9% following the Orlando slayings. Gun makers typically rise after mass shootings on expectations of more firearms purchases as politicians call for gun control legislation.
