The Friday Checkout is a weekly column providing more insight on the news, rounding up the announcements you may have missed and sharing what's to come.

Who's most at risk as Amazon expands its same-day delivery service to include fresh groceries? Based on how investors reacted to the news, Instacart appears to top the hit list.

On Wednesday - the day Amazon announced it has started offering same-day delivery of perishable groceries to customers in more than 1,000 cities and towns across the U.S. and plans to bring the offering to more than 2,300 municipalities by the end of the year - Instacart's shares fell more than 11% . By comparison, shares of Kroger, Walmart, Albertsons, Uber and DoorDash dropped less than 5% on Wednesday, with Uber's stock decreasing less than 1%.

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