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Amazon.com is tapping high-profile actors, athletes and social-media sensations like never before to maintain buzz around its Prime Day summer sale, now in its fifth year and battling increasing competition from rivals.

Amazon.com Inc. said it will spend $700 million to retrain about one-third of its U.S. workforce in skills needed to thrive in the new economy.

Amazon.com Inc. is flirting with a $1 trillion valuation again after posting its longest winning streak since briefly surpassing that level in September.

Amazon.com’s $13.7 billion purchase of Whole Foods Market spawned endless speculation about how the internet giant would change the upscale grocer. Two years later, we’ve got an answer: Ten bucks.

Amazon.com Inc. warehouse workers in Minnesota plan to strike during the online retailer’s summer sales extravaganza, a sign that labor unrest persists even after the company committed to paying all employees at least $15 an hour last year.

Prime Inc. says Amazon’s display of “Prime” on its shipping vehicles creates a likelihood of confusion with Prime Inc.'s trucking business, a July 2 complaint in the Western District of Missouri says.

Amazon.com is adding 15 aircraft to its shipping fleet in an effort to speed up delivery to customers’ doors.

Amazon.com, Exxon Mobil Corp. and Volvo are among more than 700 companies being targeted in a campaign backed by a large group of investors advocating for greater transparency when it comes to environmental impact.

Amazon, the e-retail giant, has built up its logistics infrastructure over the years. This expansion includes a new warehouse just outside Omaha, Neb., as part of an effort to control more deliveries on its own rather than relying on FedEx Corp., UPS Inc. or the U.S. Postal Service.

EMarketer Inc., among the most widely cited sources for estimates of U.S. online retail sales, now says it expects Amazon to account for 37.7% of online commerce this year, down from a prior estimate of 47%.