Check out the companies making headlines before the bell. Tilray — The cannabis stock jumped about 3%, building on last week’s rally sparked by news that President Donald Trump would instruct federal agencies to give the drug a less-stringent Schedule III classification from its current Schedule I designation. Las Vegas Sands , Marriott International — The hospitality giants rose 2.9% and 1.5%, respectively, after receiving upgrades to buy at Goldman Sachs. The bank said Marriott will benefit from strength among high-end consumers, while Las Vegas Sands will get a boost from sustained momentum in Macao. ServiceNow — Shares shed 4% after Bloomberg News reported , citing people familiar with the matter, that the software platform has engaged in talks to acquire cybersecurity firm Armis for around $7 billion. iRobot — The maker of Roomba vacuum robots plummeted 83% after the company declared bankruptcy over the weekend. Through the Chapter 11 process, Hong Kong-based Picea will acquire iRobot. — CNBC’s Fred Imbert contributed reporting.