Avidity Biosciences – the San Diego rare disease biotech being acquired by Novartis for $12 billion – is spinning off its early-stage cardiology unit into a new company called Atrium Therapeutics. In a move that gives Avidity’s shareholders a parting gift as they surrender the rest of the company to Novartis, Avidity’s board designated February 12, 2026 as the record date (close of business, Eastern Time) for the pro rata distribution of Atrium shares ( PR Newswire ). Each Avidity holder on that date will r ...