Shake Shack is trading 4.01% higher at $60.20, with no clear company-specific catalyst identified; the gain coincides with broader-market strength. - Supplied market data show the S&P 500 up 0.61% and Nasdaq up 1.09%. - The more constructive tone follows second-quarter U.S. GDP growth revised up to 2.2% from 1.5%, alongside easing inflation concerns; this is the likeliest context, not an established direct cause.