Starbucks (SBUX) shares gained 1.34% in early trading Monday after the coffeehouse giant denied it is considering an acquisition of Chipotle Mexican Grill (CMG), a deal that would have been the biggest restaurant takeover ever. A company spokesperson told CNBC that Starbucks is not buying Chipotle. Chipotle shares fell 2.78% on the news.

The denial follows days of rumors. On Thursday, the Financial Times reported that Starbucks had been working with advisers on a potential takeover proposal for Chipotle in recent months, citing people familiar with the matter. The report sent Chipotle shares higher and Starbucks stock lower, a common reaction when an acquirer is seen as preparing to pay a premium.

Separately, Semafor reported earlier in October that Chipotle had hired advisers to defend against activist investors or an unwanted takeover bid. The fast-casual chain is trying to recover from a rocky 2025, when traffic to its restaurants fell, and its shares are down about 20% over the past year, which could make the company a more attractive target for suitors.

A deal would have reunited Starbucks CEO Brian Niccol with Chipotle, which he led before taking the helm at Starbucks in 2024. Monday's statement removes that scenario for now, though it does not address whether other bidders or activists could emerge.

The market reaction illustrates the two-sided nature of takeover speculation. Chipotle's fall of 2.78% suggests investors had been pricing in some probability of a premium offer, while Starbucks' 1.34% gain implies relief that the company would not undertake a transformational and potentially costly acquisition. Neither move is large, which signals that traders did not treat the rumor as a certainty.

Consumer-facing stocks are also being watched for the impact of higher fuel costs. Diesel is at record prices, according to one market commentator, and the University of Michigan's preliminary October sentiment reading fell to 46.3 from 48.1 in September. Those pressures could affect restaurant traffic and margins in coming quarters, particularly for chains already working to win back customers.

With big-bank earnings due Tuesday and inflation data Wednesday and Thursday, the restaurant sector will likely trade on macro signals unless fresh deal news appears.