Billionaire Warren Buffett's company Berkshire Hathaway posted a nearly $50 billion net loss in the first quarter of 2020 thanks to plummeting markets during the coronavirus crisis, a regulatory filing Saturday indicates. Shareholders lost $49.7 billion in the first three months of 2020, including after-tax losses, according to a regulatory filing , largely from a decline in market prices of equity securities. "Prior to the middle of March, many of ...