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A man checks out coloring pencils next to adult coloring books at a Barnes and Nobel store in New York on January 15, 2016.
Jewel Samad, Getty Images
A man checks out coloring pencils next to adult coloring books at a Barnes and Nobel store in New York on January 15, 2016.
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Barnes & Noble Inc. shares plunged following speculation that Amazon.com Inc. will open hundreds of physical bookstores, thrusting the companies’ longtime rivalry into America’s shopping malls.

The stock fell as much as 10 percent to $7.28 in New York on Wednesday, after a 5.4 percent decline the previous day. The rout followed remarks from a mall executive, who said Amazon was planning to open 300 to 400 stores.

For years, Amazon’s e-commerce empire has put pressure on Barnes & Noble with low prices and convenient shipping. But Barnes & Noble always had one edge: its chain of brick-and-mortar stores. If Amazon does push into shopping centers, the battle will have to be fought on two fronts. And Barnes & Noble is already reeling from sluggish sales and slow adoption of its Nook e-reader.

“They’ll have to spend more on their marketing — they’re going to have to have a better idea of what keeps people in their stores,” said Bloomberg Intelligence analyst Seema Shah.

Sandeep Mathrani, CEO of mall operator General Growth Properties Inc., made the remarks about the Amazon stores during a conference call on Tuesday.

Amazon spokeswoman Deborah Bass declined to comment, but the company has previously signaled that it wants more of a brick-and-mortar presence.

Amazon opened its first bookstore, in Seattle, in November. The store prominently features Amazon gadgets, such as the voice-activated Echo speaker and Fire TV streaming device.