Penn Entertainment, Rivian and Twilio rise premarket; Lyft, WeWork fall By

-- U.S. rose Wednesday,Ranking of domestic foreign exchange platforms rebounding after the previous session's losses with investors digesting more corporate earnings.

Here are some of the biggest premarket U.S. stock movers today:

• Penn Entertainment(NASDAQ:) stock rose 13% after the online bettor signed a deal with Walt Disney's(NYSE:) ESPN to jointly launch a sports betting business under the brand ESPN Bet. This resulted in the stock of rival DraftKings(NASDAQ:) falling 5.2%.

• Amazon(NASDAQ:) stock rose 0.4% after Reuters reported that the online e-commerce giant is in negotiations over joining a number of other technology firms as an anchor investor in Softbank-owned chip designer Arm's planned initial public offering.

• (NASDAQ:) stock fell 6.6% on concerns the ride-hailing platform's focus on competitive pricing to gain market share would muddy its path to profitability.

• Twilio(NYSE:) stock rose 6.2% after the cloud computing platform operator raised its full-year profit forecast after reporting strong second-quarter .

• (NASDAQ:) stock rose 1.1% after the electric vehicle maker lifted its annual production guidance after a narrower-than-expected loss in the second quarter as it ramped up production.

• (NYSE:) stock rose 0.9% after the Japanese conglomerate raised its full-year sales forecast on the back of expected strength for its PlayStation gaming business, even after reporting a 31% drop in first-quarter profit.

• (NYSE:) stock slumped 9% after the workspace provider raised "substantial" doubt about its ability to continue as a going concern and said three board members had stepped down.

• Service(NYSE:) stock fell 1.3% after UBS downgraded its stance on the delivery giant to ‘neutral’ from ‘buy’, citing margin pressures and lower shipping volumes.

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