Check out the companies making the biggest moves midday: Lennar — The homebuilder rose more than 4% after Berkshire Hathaway disclosed it purchased more than 2.7 million shares. Amgen — The biotech name gained more than 3% after announcing positive phase 3 trial results for dazodalibep, which aims to treat moderate-to-severe Sjögren’s disease in adults. Grab Holdings — Shares jumped more than 7% after the Singapore-based ride-hailing company’s CEO, Anthony Tan, disclosed he recently bought 10.4 million shares. SoFi Technologies — The fintech giant climbed more than 1% after announced that stablecoin settlement is now live across its debit and credit card program . Capri — The parent of Michael Kors and Jimmy Choo rose 7% after WWD reported, citing sources, the company has been in contact with potential buyers. Shopify — Shares gained nearly 7% after the company said it would use Muse, Meta’s personal AI agent, to incorporate to enable agentic checkout on the platform. Quest Diagnostics , Labcorp Holdings — The two providers of diagnostics services dropped 5.3% and 3.6%, respectively, after the Centers for Medicare & Medicaid Services released a report showing that Medicare has been paying 16% more for laboratory services than private payors. The federal entity said that it will align most Medicare payments with the private sector rates. Vicor — Shares rallied 14% after the power electronics company issued third quarter guidance, saying it forecasts sequential revenue growth of more than 20% quarter over quarter, versus prior guidance of nearly 10%. On Holding — The Swiss sportswear company jumped more than 10% after On at its Investor Day set new midterm financial targets, including absolute net sales reaching at least CHF5.6 billion by 2029, and gross profit margin of 65% throughout the period. It also said it will repurchase up to an aggregate of $1 billion in Class A ordinary shares by December 2029. It also reiterated its full year 2026 outlook. GameStop — The meme stock gained 4% after CEO Ryan Cohen disclosed a purchase of 1.2 million shares.