Shares of GrubHub Inc. GRUB, +6.38% rose 5% in morning trading Tuesday amid reports that Amazon.com Inc. AMZN, +1.30% is shutting down its restaurant-delivery business. “The shuttering of the platform doesn’t necessarily mean that Amazon won’t eventually invest in the space, but it at least temporarily removes the existential threat of an aggressive organic expansion and, in turn, positions the company as a potential acquirer,” wrote Mizuho analyst Jeremy Scott. “Grubhub, which arguably has the lowest valuation per point of market share in the space, is likely an attractive target despite the near-term headwinds.” Still, he said there are “more effective combinations” for the company that would let it “carve an inside track of restaurant-centric, enterprise solutions.” The stock has fallen 11% so far this year, as the S&P 500 SPX, +0.59% has climbed 16%.