Stocks making the biggest moves in the premarket: Nielsen Holdings, FedEx, LHC Group and more

cnbc.com:

Take a look at some of the biggest movers in the premarket:

Nielsen Holdings (NLSN) – The TV ratings company's stock surged 20.9% in the premarket after it agreed to be acquired by a private-equity consortium for $28 per share. The deal is worth $16 billion, including assumed debt.

FedEx (FDX) – FedEx CEO Fred Smith will step down from that role at the company he founded more than 50 years ago. He'll become executive chairman on June 1 and will be replaced as CEO by President and Chief Operating Officer Raj Subramaniam. FedEx shares rose 2% in the premarket.

LHC Group (LHCG) – UnitedHealth (UNH) will buy the home health-care specialist for $5.4 billion in cash, or $170 per share, according to The Wall Street Journal. LHC will become part of UnitedHealth's Optum health-care services unit. LHC shares jumped 7.5% in premarket action.

Uber Technologies (UBER) – Uber is close to an agreement with a San Francisco taxi company to include taxis in its ride-hailing platform in that city, according to people familiar with the matter who spoke to The New York Times. Uber recently struck a similar agreement in New York City. The stock added 1.9% in premarket action.

Jefferies Financial (JEF) – The asset management firm's stock rallied 3.7% in the premarket after reporting better-than-expected quarterly profit and revenue. Jefferies earned $1.23 per share, well above the 89 cents a share consensus estimate, even as profit fell from a year earlier amid what the company called a «challenging» trading environment.

GameStop (GME) – GameStop remains on watch as the videogame retailer's stock rides a 10-session winning streak that has seen it gain 143%. Another «meme stock» on a roll is movie theater operator AMC Entertainment (AMC), which