US stock futures edged lower Tuesday morning, with the Dow futures down slightly. Rubrik, Inc. shares tumbled in pre-market trading following their second-quarter earnings report. While the company beat analyst expectations on both earnings and revenue, the stock still faced pressure, dropping over 8%. Several other stocks also experienced losses in pre-market trading, including Ionis Pharmaceuticals, Applied Digital Corporation, VNET Group, Hewlett Packard Enterprise, Extreme Networks, PureTech Health, and Dropbox.