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Amazon’s Whole Foods Price Cuts Are Hurting These 2 Chains the Most

Whole Foods rivals Trader Joe’s and Sprouts Farmers Market (SFM) have been hit hardest by customer defections since Amazon’s price cuts at the premium grocer, Whole Foods price cuts, a data analytics firm said on Tuesday.

Amazon (AMZN) cut prices on select items at Whole Foods on Aug. 28. On the first day, customer traffic spiked 31% from a year earlier. Traffic jumped 17% during the week after the price reductions and remained up 4% for the week ended Sept. 16, according to Thasos Group, which analyzes location data from millions of mobile phones.

Ten percent of Trader Joe’s regular customers visited Whole Foods between Aug. 28 and Sept. 16, more than any other competing chain, Thasos Group said. Sprouts was No. 2 at 8%, followed by Target (TGT) at 3% and Costco Wholesale (COST) and Safeway (SWY) at 2% each.

Wal-Mart Stores (WMT) and Kroger (KR), the leading U.S. grocery sellers with millions of shoppers, were the top sources of new customers after the price cuts at Whole Foods. They accounted for 24% and 16% of Whole Foods new customers, respectively, from Aug. 28 through Sept. 16. During that period, 15% of shoppers came from Costco, 11% were from Target and 5% were from Wal-Mart’s Sam’s Club.

The price reductions did not attract customers outside Whole Foods’ traditional upper-income demographic. They also did not convince consumers to drive longer distances to shop at Whole Foods, said Thasos Group Chief Executive Greg Skibiski, who added that the dataset used for the Whole Foods competitive analysis includes 10% of the U.S. population.

“Amazon’s acquisition of Whole Foods has the potential to be a gamechanger in the grocery space,” Skibiski said.

Orbital Insight, which monitors business at about 65% of Whole Foods locations, reported a 5% year-over-year increase in car traffic to Whole Foods stores in the month since the acquisition closed on Aug. 28.

Foursquare, which analyzed the mobile phone movements of more than 2.5 million Americans, said traffic to Whole Foods was up about 13% the first week after the price cuts and remained up 8% after the second week.