Whole Foods
Amazon may get into a bidding war for Whole Foods.

AP

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Amazon may have to put up a fight for Whole Foods.

Speculation on Wall Street is growing that another bidder could counter Amazon’s offer of $13.7 billion, or $42 a share, for the natural and organic grocery chain.

“Many will do anything to either make this acquisition more costly for Amazon, or prevent the asset from landing in Amazon’s lap,” Barclays analyst Karen Short wrote in a research note.

Whole Foods’ shares closed at $43.22 a share on Monday, about 3% over Amazon’s offer price, indicating that investors are rallying around the…