Check out the companies making headlines in extended trading. Chubb — The property and casualty insurer gained nearly 6% after Berkshire Hathaway revealed it has bought nearly 26 million shares of Zurich-based company for a stake worth $6.7 billion. Chubb became Berkshire's ninth biggest holding at the end of March, according to a new regulatory filing. AST SpaceMobile — Shares rocketed 33%.
Riley Financial — The Los Angeles-based middle-market investment bank fell 2% after losing $1.71 per share in the first quarter, reversing year earlier net income of 51 cents. Riley, which received a Nasdaq delinquency notice in March, left its quarterly dividend at 50 cents a share after halving it in February . Hawkins — The Minnesota-based chemical maker dropped 6% after fiscal fourth quarter sales fell 2% from the year-earlier period.