Bristol-Myers Squibb, Twitter, Gilead Sciences and more
Check out the companies making the biggest moves midday Monday:Gilead Sciences — Shares of Gilead rose 3.8% after the biopharmaceutical company revealed it settled a patent case over its HIV therapies with five generic drugmakers.Twitter — Shares of Twitter slipped 2% after the company said in a regulatory filing that Elon Musk's latest attempt to cancel the deal to buy the social media group is invalid. Most recently, Musk attempted to terminate the purchase citing Twitter's treatment of a whistleblower.Carvana — Carvana…