Check out the companies making headlines in pre-market trading. Novo Nordisk — The stock rose about 5%, rebounding from a nearly 18% loss in the previous session. On Friday, the Danish pharmaceutical giant’s experimental weight loss drug CagriSema reported late-stage trial results that fell short of expectations. Honda – U.S.-listed shares soared 15% after the company officially began merger talks with Japanese automaker Nissan Motor Co. The automakers plan to conclude discussions by June 2025. The deal is worth $1.5 billion. Occidental Petroleum, Sirius XM and VeriSign – stocks that Warren Buffett revealed last week his Berkshire Hathaway Shares of the three companies continued to rise before the market opened on Monday. Occidental and Sirius XM both rose more than 2%, while VeriSign gained 1.8%. Tesla – The electric car maker rebounded 3% in pre-market trading, recovering some ground after falling last week. Tesla fell 3.5% last week, its worst weekly performance since before the U.S. presidential election. Despegar.com — Shares of Prosus soared 32% after the company signed a definitive agreement to acquire the Argentina-based online travel platform for $19.50 per share. Prosus will pay $1.7 billion as part of the deal, which is expected to close in the second quarter of 2025. . The company said tivoxavir marboxil showed safety and tolerability in a Phase 1 trial and will begin a Phase 2 study early next year. The news comes as the threat from bird flu is expected to rise. The biotech stock rose more than 5% on news that the first patient has received experimental immunotherapy IMC-0115C. —CNBC’s Sean Conlon and Christina Cheddar Berk contributed reporting