Kevin Lamarque/Reuters Warren Buffett's Berkshire Hathaway sold nearly $390 million worth of shares in Delta Air Lines and Southwest Airlines this week, new SEC filings show. The billionaire investor's company cut its stake in Delta by nearly one-fifth and its Southwest holdings by just over 4%. Berkshire's stock portfolio took an estimated $5 billion hit on its airline holdings in the first quarter as the novel coronavirus hammered demand and led to travel restrictions. Visit Business Insider's homepage for more stories. Warren Buffett's Berkshire Hathaway sold nearly $390 million worth of shares in Delta Air Lines and Southwest Airlines this week, reducing its exposure to an industry being hammered by the coronavirus pandemic. The famed investor's conglomerate slashed its roughly 11% stake in Delta by nearly one-fifth, from 71.9 million shares to 58.9 million, according to a Securities and Exchange Commission filing published on Friday.See the rest of the story at Business InsiderNOW WATCH: A big-money investor in juggernauts like Facebook and Netflix breaks down the '3rd wave' firms that are leading the next round of tech disruptionSee Also:A new survey of 159 pro investors shows experts are looking to buy stocks again.