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Companies to Watch: Amazon Prime Day announced, GrubHub upgrades, Tesla wins big

Here are the companies Yahoo Finance is watching today.

Amazon's (AMZN) Prime Day will be two days this year. The e-commerce giant has set July 15 and 16 for the annual sale, running for 48 hours for the first time. A lot of the deals are kept under wraps until the event starts. Amazon made over a billion dollars in sales during last year's prime day.

A big vote of confidence for GrubHub (GRUB). Citi just upgraded the stock to Buy, setting a $91 price target. Analysts there say that while competition remains fierce, GrubHub seems to be able to keep growing, and that bodes well for the stock. However, UberEats and DoorDash could pose risks for the future.

Tesla (TSLA) has won a fight with the Trump administration. The commerce department has agreed to waive tariffs on Japanese aluminum, imported to build battery cells at Tesla's Nevada Gigafactory. Tesla had said no U.S. companies can make the aluminum they need for the batteries. The waiver is good for one year.

If you forget to buy alcohol for your next BBQ this summer, Sam's Club (WMT) can now come to your rescue. The retailer is offering customers in Florida, California and Missouri same-day delivery for hundreds of its alcohol options via Instacart. Shoppers will be able to order their spirits and receive them in as little as one hour. It plans to expand the service to include more locations in the coming months.

Warner Brothers (T) has a new chief executive. WarnerMedia named current president of BBC Studios Americas, Ann Sarnoff, as CEO of Warner Brothers. She will be the first woman to run one of Hollywood's most powerful studios. This comes after the former CEO resigned earlier this year following accusations that he secured a role for an actress with whom he was having an affair with.