Einhorn's bet on Yelp; Pfizer posts 20% jump; GM's sales miss

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Yelp (YELP) – Hedge fund manager David Einhorn revealed that he has made new investments in the business review site. In his first-quarter letter to investors, Einhorn wrote, “If the company executes its current plan, by 2019 it will double revenues and earn $300 million of EBITDA at a 35% margin.”

Pfizer (PFE) – The pharmaceutical giant topped Wall Street estimates in the first quarter and raised its full year revenue and earnings forecast. Pfizer reported adjusted earnings per share of $0.67 on revenue of $13.01 billion.

General Motors (GM) – The auto giant's U.S. sales fell 3.5% in the month of April due to a decline in fleet business. But its retail sales rose 3.3%, boosted by sales at its Chevrolet, Buick, and GMC brands.

Six Flags (SIX) – The company has released plans for its new theme park in Dubai. Six Flags’ new theme park scheduled to be opened in 2019 and will include "record-breaking" roller coasters.

AIG (AIG) — The insurance giant missed estimates, posting adjusted earnings of $0.65, down from $1.22 per share one year ago. AIG reported a net loss of $183 million for the first quarter, compared with a net income of $2.5 billion in the previous year.

Biogen (BIIB) – The company is planning to spin off its hemophilia business into a stand-alone company. The spin-off, which will be headquartered in the Boston area, is expected to be completed by early 2017.

Sprint (S) – The wireless carrier reported better-than-expected fourth-quarter earnings. Sprint is in the middle of a multi-year plan to transform the way it does business and significantly lower costs.

Fiat Chrysler (FCAU) – The automaker posted a 5.6% rise in April U.S. auto sales, selling a total of 199,631 vehicles in the month. Fiat Chrysler’s numbers were driven by continued demand for its Jeep brand. It was the best April for the automaker in 11 years.