Investing.com -- Stocks in focus in premarket trade on Friday, April 28th. Please refresh for updates.

• Amazon (NASDAQ: AMZN) stock fell 3.4% after the tech giant warned of a slowdown at its crucial cloud-computing division Amazon Web Services - a major driver of the group's overall profit.

• Intel (NASDAQ: INTC) stock rose 6.1% after the chipmaker said gross margins will improve in the second half of the year, after reporting the largest quarterly loss in the company’s history.

• Snap (NYSE: SNAP) stock slumped over 18.1% after the company, which owns photo messaging app Snapchat, missed quarterly revenue expectations as changes to its advertising platform hurt demand for ads.

• Pinterest (NYSE: PINS) stock fell 13% after the image-sharing company forecast second quarter revenue growth below expectations, hit by a pullback in advertising spending.

• Exxon Mobil (NYSE: XOM) stock rose 0.8% after the oil giant reported a record first quarter profit as rising oil and gas output overcame a pullback in energy prices from high levels.

• Chevron (NYSE: CVX) stock fell 0.3% after the oil company reported strong earnings in the first quarter but its upstream business - responsible for oil and gas production - saw its income slip.

• Sony (NYSE: SONY) stock fell 3% after the Japanese conglomerate forecast its profit will slip from a record high as weaker financial services sales offset gains from gaming, music, and movies.

• First Republic Bank (NYSE: FRC) stock rose 4.4% on reports that the U.S. government is coordinating urgent talks to rescue the beleaguered lender.

• Cloudflare (NYSE: NET) stock fell 24% after the cloud services provider posted weaker-than-expected first quarter revenue and issued a downbeat full-year forecast.