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Here are 10 things you should know for Monday, June 13:

1. -- U.S. stock futures were trading to the downside Monday, European stocks fell and shares in Asia plunged on fears over a U.K. "Brexit" and the Federal Reserve's next move on rates. 

London shares fell as opinion polls continued to show momentum for the "leave" campaign ahead of the June 23 referendum on the U.K.'s European Union membership.

Japan's benchmark Nikkei 225 dropped 3.5% as the yen surged against the dollar, hurting exporters. South Korea's Kospi fell 1.9%, Hong Kong's Hang Seng tumbled 2.7%, and the Shanghai Composite declined 3.2%.

2. -- The economic calendar in the U.S. on Monday is bare.

3. -- U.S. stocks on Friday ended lower as losses piled upon losses in the final hour of trading, pulling benchmark indices lower for the week.

The S&P 500 fell 0.91%, the Dow Jones Industrial Average slid 0.66%, and the Nasdaq declined 1.29%.

4. -- Symantec (SYMC) - Get Report  announced late Sunday that it would acquire fellow cybersecurity company Blue Coat Systems for $4.65 billion in cash. 

Following the close of the merger, Blue Coat CEO Greg Clark will be appointed CEO of Symantec and will join Symantec's board. Symantec has been searching for a CEO since former chief, Michael Brown, stepped down April 28 after a disappointing quarter. 

"Once combined, we will offer customers around the world -- from large enterprises and governments to individual consumers -- unrivaled threat protection and unmatched cloud security," Clark said in a statement. 

Blue Coat's majority shareholder, Bain Capital, and fellow private-equity firm Silver Lake Partners will each invest in connection with the transaction. Silver Lake, which previously invested $500 million in Symantec, invested an additional $500 million in 2% convertible notes due 2021. Bain made an investment of $750 million in the convertible notes. The notes are noncallable and unsecured, with an initial conversion price of about $20.41 per share. Bain managing director David Humphrey will join Symantec's board following the close.

5. -- Walgreens Boots Alliance (WBA) - Get Reportformally ended its relationship with beleaguered Theranos, saying it will close all the care centers run by the blood testing company as it is circled by regulators. 

Effective immediately, Walgreens will close all 40 Theranos testing centers at its stores in Arizona. The pharmacy chain closed its Palo Alto, Calif. Theranos testing center in January. 

In a statement, Walgreens' Brad Fluegel, who is senior vice president and chief health care commercial market development officer, said: "In light of the voiding of a number of test results, and as the Centers for Medicare and Medicaid Services (CMS) has rejected Theranos' plan of correction and considers sanctions, we have carefully considered our relationship with Theranos and believe it is in our customers' best interests to terminate our partnership."

Walgreens is a holding in Jim Cramer's Action Alerts PLUS Charitable Trust Portfolio. Want to be alerted before Cramer buys or sells WBA? Learn more now.

6. -- Apple (AAPL) - Get Reportkicks off its annual software developers conference on Monday, and all eyes -- and ears -- are likely to be on Siri. 

The tech giant is expected to unveil a more capable digital assistant during its Worldwide Developers Conference, as well as Siri's potential inclusion in the company's Mac ecosystem. These moves would put Apple more in line with other tech companies that are thinking about adding artificial intelligence to smartphones, tablets, computers and dedicated devices such as Amazon's (AMZN) - Get ReportEcho and Alphabet's (GOOGL) - Get Report  pending Home.  

The conference begins Monday with a keynote address from CEO Tim Cook at 10 a.m. Pacific Time at San Francisco's Bill Graham Civic Center. 

Apple and Alphabet are holdings in Jim Cramer's Action Alerts PLUS Charitable Trust Portfolio. Want to be alerted before Cramer buys or sells AAPL or GOOGL?Learn more now.

7. -- Walmart's (WMT) - Get Report Canada division said over the weekend it would stop accepting Visa (V) - Get Report cards at all of its locations, citing "unacceptably high" fees.

Walmart has 405 stores in Canada. It said it would stop accepting Visa cards starting with three stores in Thunder Bay, Ontario, on July 18.

"After Thunder Bay, it'll be a phased approach across the country. It's limited to Canada," a Walmart spokeswoman told The Wall Street Journal.

"We are disappointed that Walmart chose to put their own financial interests ahead of their own consumers' choice," Visa said, adding that Walmart made the decision "despite Visa offering one of the lowest rates available to any merchant in the country."

Visa is a holding in Jim Cramer's Action Alerts PLUS Charitable Trust Portfolio. Want to be alerted before Cramer buys or sells V? Learn more now.

8. -- Uber Technologies peer DiDi Chuxing scored more than $600 million in funding from China Life Insurance, just a month after it raised $1 billion from Apple.

The China Life Insurance funding breaks down into $300 million equity and a 2 billion renminbi ($303.7 million ) long-term loan. The companies said it forms the basis of an alliance to build a "comprehensive partnership on Internet-powered financial innovation initiatives" and to collaborate "on investment opportunities in mobile transportation and related sectors in China and beyond."

9. -- Millions of Dish (DISH) - Get Report TV subscribers lost access to one or more channels Sunday night because of a fight over how much the satellite TV company should pay for the channels.

Channel owner Tribune Media (TPUB) said its local stations, like CBS, CW and Fox, reach more than 5 million Dish subscribers in dozens of cities across the country. The WGN national cable channel, which Tribune said has 7 million Dish subscribers, also went dark.

"Tribune is demanding an unreasonable rate increase for channels that are available for free over the air," said Warren Schlichting, Dish Network's executive vice president of programming.

Tribune said Dish refused to reach an agreement based on "fair-market value" that Dish already pays other local station groups, Reuters reported.

"We're willing to accept the same rates for our local stations and WGN America that others are currently paying us," said Gary Weitman, Tribune Media's senior vice president for corporate relations.

10. -- Warner Bros. (TWX) film "The Conjuring 2," an old-school horror flick, was the top movie in weekend theaters, opening with estimated $40.4 million.

The big-budget video-game adaptation "Warcraft" came in second with $24.4 million, according to studio estimates Sunday.