Shares of DoorDash Inc. /zigman2/quotes/222973991/composite DASH -1.32% and Uber Technologies Inc. /zigman2/quotes/211348248/composite UBER +0.50% are falling in premarket trading Wednesday after Amazon.com Inc. /zigman2/quotes/210331248/composite AMZN -1.24% struck a partnership with Grubhub, a unit of Just Eat Takeaway.com NV /zigman2/quotes/201653805/delayed NL:TKWY -1.89% . Through the arrangement, Amazon will make Grubhub a benefit to Prime members and offer members the chance to get delivery fees waived from certain restaurants, according to The Wall Street Journal . Additionally, Amazon has an opportunity to take an initial 2% stake in Grubhub, and it could boost that stake to 15% if it hits targets around user acquisition. Just Eat shares are up more than 19% in Wednesday trading in the Netherlands, while shares of U.S.-based food delivery companies are falling premarket. Shares of DoorDash are down more than 7% and shares of Uber, which operates the Uber Eats delivery service, are off more than 3%. Just Eat still intends to look into a potential full or partial sale of Grubhub, per the Wall Street Journal report.