Here are 10 things you should know for Monday, March 21:

1. -- U.S. stock futures pointed to slight gains for Wall Street on Monday while overseas stocks traded mixed as lower oil prices and growth concerns weighed on equities.

The Shanghai Composite jumped 2.2% after Chinese authorities loosened controls on brokerages lending money to investors for buying stocks.

Oil prices in the U.S. fell 1.1% to $39 a barrel early Monday. 

2. -- The economic calendar in the U.S. Monday includes Existing Home Sales for February at 10 a.m.

3. -- U.S. stocks on Friday rose and the bulls mobilized last week, thanks to another surge in crude oil and a dovish Federal Reserve

For the week, the S&P 500 added 1.3%, the Dow Jones Industrial Average climbed 2.2%, and the Nasdaq rose 1%. The week's gains were enough to erase year-to-date losses on the S&P 500 and the Dow.

4. -- Paints company Sherwin-Williams  (SHW - Get Report) agreed to buy rival Valspar  (VAL - Get Report)  for about $11.3 billion, or $113 a share.

The deal was unanimously approved by the boards of both companies and represents a premium of about 41% to Valspar's volume-weighted average share price for the 30 days up to and including Friday. Valspar shares closed Friday at $83.83.

"The transaction results in an exceptional, diversified array of strong brands and technologies, accelerates Sherwin-Williams growth strategy by expanding its global platform in Asia-Pacific and EMEA, and also adds new capabilities in the packaging and coil segments," the companies said. 

The deal is expected to close by the end of the first quarter of 2017.

5. -- Seed giant Monsanto (MON)  approached Bayer to express interest in its crop science unit, including a potential acquisition worth more than $30 billion, Reuters reported, citing people familiar with the matter.

Monsanto executives met in Chicago recently to discuss the company's interest in Bayer's agricultural assets, the sources said. Monsanto sees valuable synergies between its seed business and the crop protection assets of Bayer, the sources told Reuters.

Last year, Monsanto approached Switzerland's Syngenta with a takeover approach but was rejected.

6. --  Starwood Hotels (HOT)  signed a deal over the weekend to renovate and run three Cuban hotels, returning U.S. chains to the island more than 50 years after American hotels were taken over by Fidel Castro's socialist revolution.

The deal comes as President Barack Obama visits Cuba, the first U.S. president to do so in 88 years.

Meanwhile, Airbnb is allowing travelers from around the world to book stays in private homes in Cuba after the online lodging service received a special authorization from the Obama administration.

7. -- Apple (AAPL - Get Report)  hired a new security executive to oversee its corporate digital defenses, people familiar with the matter told Reuters.

Apple appointed George Stathakopoulos, formerly vice president of information security at Amazon.com and before that Microsoft's general manager of product security, to be vice president of corporate information security, the people said.

Stathakopoulos reports to Apple's chief financial officer and will be responsible for protecting corporate assets, such as the computers used to design products and develop software, as well as data about customers, according to Reuters. 

Apple is locked in a battle with the FBI over the federal agency's demand for help unlocking a San Bernardino killer's encrypted iPhone.

Meanwhile, Apple on Monday is expected to show off some new additions to the current family of iPhone and iPad devices at its headquarters in Cupertino, Calif.

Apple is a holding in Jim Cramer's Action Alerts PLUS portfolio.