Tech wreck on Wall Street: a massive sell-off in U.S. tech shares wipes off $1tn from the market cap of the six largest firms. The Nasdaq is plunged into correction territory after losing a further 4 per cent. Tesla loses a fifth of its value in a single session, falling more than 20 per cent in its worst-ever trading day, after the electric car giant is left out of the S&P 500. Asian indices also see red as concerns are raised over Japanese investment titan Softbank’s tech bets. And in pharma news, AstraZeneca halts global trials of its potential Covid-19 vaccine after an unexplained illness during Phase 3 testing.See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.