A technical glitch at the New York Stock Exchange (NYSE) on Monday caused Berkshire Hathaway’s A-class shares to incorrectly appear down nearly 100%, halting trading in these shares as well as in Barrick Gold and Nuscale Power. The NYSE is investigating the issue, related to the limit up and limit down bands designed to control excessive volatility. The exact number of affected stocks is unclear. The Consolidated Tape Association, which provides real-time stock quotes, also reported an earlier failure. Trading in Berkshire Hathaway’s B-class shares continued, with a slight decrease of less than 1%.