Early movers: AAPL, WBA, T, VZ, YHOO, VRX, SYMC

Take a look at some of Monday's early movers:

Microsoft, LinkedIn — Microsoft will acquire the professional social network for $196 per share in an all-cash transaction valued at $26.2 billion that is expected to close this calendar year. Jeff Weiner will remain CEO of LinkedIn, reporting to Satya Nadella, CEO of Microsoft, according to the release. Shares of LinkedIn were up nearly 50 percent in pre-market trade, while Microsoft was trading slightly lower.

Apple — The iPhone maker kicks off its annual Worldwide Developers Conference Monday. Its artificial intelligence-powered assistant Siri is expected to be in focus.

Walgreens Boots Alliance — The Walgreen drugstore chain terminated its relationship with the blood-testing firm Theranos, which has increasingly come under scrutiny for the accuracy of its tests.

YahooVerizon and AT&T are set to make final bids for Yahoo's core internet assets, Reuters said, citing people familiar with the matter. Second-round offers were in a $3.5 billion to $5 billion range.

Symantec — The maker of Norton antivirus software announced it will buy privately held cybersecurity firm Blue Coat for $4.65 billion in a cash deal.

Tribune Media, Dish — Tribune took its television channels off Dish Network's distribution systems across the United States on Sunday night after the two firms failed to renew their contract. Dish said its customers lost access to more than 40 local channels as well as cable channel WGN America.

Valeant Pharmaceuticals — The company's new CEO Joseph Papa bought 202,000 shares of the company in multiple transactions at an average price of $24.48 a share, according to a Securities and Exchange Commission filing.

Smith & Wesson, Sturm Ruger — Shares of the firearm manufacturers were up more than 7.5 percent and 4 percent, respectively, in premarket trading, after the weekend massacre in Orlando, Florida.

—Reuters contributed to this report.