(Bloomberg) — Taiwan stocks slumped, extending their biggest rout in more than a year, as the government tightened restrictions on people and businesses to control its worst outbreak of the coronavirus.The Taiwan Stock Exchange Weighted Index closed the Monday session 3% lower, having slid as much as 4.2%, as authorities urged companies to allow staff to work from home or split locations after reporting a record 206 new local cases Sunday. The benchmark gauge sank 8.4% last week on concern about the impact on growth, the most since March 2020, turning Taiwan stocks into the world’s worst performers so far this month.Taipei City to Close Schools After Surge in Local CasesForced selling may add volatility to Monday’s trading, with the level of margin debt falling by a net NT$5.8 billion ($207 million) on Friday, according to exchange data compiled by Bloomberg. That took the four-day drop in leverage to NT$39.4 billion, showing traders faced margin calls by brokers to cover losses in their stock accounts.The sharp reversal in Taiwan stocks is a warning to highly leveraged investors around the world. The Taiex was the world’s best performing equity gauge in the three years through April, surging almost 80% in U.S. dollar terms, as a seemingly never-ending rally in tech shares pulled in retail investors.“In light of rising concerns over the pandemic, we expect more volatility ahead, and advise to stick to defensive names with low P/E and high dividend yield,” said Patrick Chen, CLSA’s Head of Taiwan Research. His team’s top picks include Taiwan Semiconductor Manufacturing Co. and Hon Hai Precision Industry Co.Travel and consumption-linked names were among the big losers in the market on Monday. Restaurant operators Gourmet Master Co. and Wowprime Corp. plunged almost 10% each, while shares of Formosa International Hotels Corp. and The Ambassador Hotel slumped at least 4% each.Taipei City will close high schools, elementary schools and kindergartens for two weeks through May 28 to prevent the pandemic from spreading, Mayor Ko Wen-je said at online briefing. Taiwan added 333 local Covid-19 cases on Monday, a fresh record.“Investors are worried as school closures could mean the virus is spreading fast,” said Edward Chen, chairman of First Capital Management. “However, there’s no need to panic as the Taiwanese people are vigilant in Covid prevention. It would be another story though if factory production lines are forced to stop.”Taiwan and Singapore are among the Asian regions that have seen a fresh wave of Covid-19 cases in recent days, and both have tightened virus-related restrictions. Singapore’s stock benchmark slid as much as 0.9% on Monday before erasing the loss.Taiwan’s stock exchange urged investors not to overreact. The latest development in Covid fighting is relatively controllable, and the fall in stock market last week should be already priced in the situation, the bourse said in a statement issued late Sunday night, adding that stabilizing measures will be adopted if the market becomes irrational.For more articles like this, please visit us at bloomberg.comSubscribe now to stay ahead with the most trusted business news source.©2021 Bloomberg L.P.