Investors prepare for a key Brexit speech from U.K. Prime Minister Theresa May, who is expected to signal that Britain is headed for a "hard Brexit" that will see the U.K. leave the single market.

General Motors (GM - Get Report) announced a $1 billion investment plan. The automaker expects the plan will add or retain 1000 jobs at existing factories.

Hyundai plans to increase investment in the U.S. The company president said Hyundai, Kia and affiliated companies will spend $3.1 billion by 2021.

British American Tobacco (BATS) bought the remaining stake of Reynolds American (RAI) . The $49 billion deal will create the world's largest listed tobacco firm.

Noble Energy (NBL - Get Report) is set to buy Clayton Williams Energy (CWEI) . The $2.7 billion deal expands Noble Energy's holdings in the Permian Basin.