(Bloomberg) -- Shares of the media company founded by Hong Kong government critic Jimmy Lai surged as much as 107% as they resumed trading Friday, following his detention on charges related to an earlier arrest under the China-drafted national security law.The advance briefly pushed Next Digital Ltd. to the highest level since the days following his August arrest. Back then, the stock surged 1,100% in two sessions to a seven-year high before wiping out those gains.Next Digital shares were 60% higher as of 10:38 a.m. in Hong Kong, resuming trading after being halted on Thursday after Lai’s arrest. “It’s purely speculative,” said Kenny Wen, an analyst at Everbright Sun Hung Kai Co. Ltd., of Friday’s gains. “The stock is too volatile and the risk of reversion is very high, as we saw in August. Things can turn around very quickly and investors will lose out if they can’t pull out in time.”Hong Kong police in October arrested more than a dozen people in connection with the summer surge on suspicion of the use of illegal funds and conspiracy to defraud. Police said one of the people had links to organized crime, and six were unemployed.Lai, 73, was this week denied bail on the new charges related to the August arrest, which could potentially keep him behind bars for months as he fights the allegations.The publisher and his fellow executives were charged with violating the lease terms of the office park housing Next Digital’s headquarters by basing a family office there to manage his personal finances. He wasn’t immediately charged with potentially more serious allegations of foreign collusion under the security law, which in August prompted his arrest and a dramatic raid of the newsroom of Next Media’s Apple Daily newspaper.Hong Kong Tycoon Jimmy Lai Denied Bail in Ongoing Crack Down (1)China’s crackdown on Hong Kong dissent has prompted international condemnation, and the U.S. has hit Chief Executive Carrie Lam and several other officials responsible for the city with sanctions. Lam said she was collecting “piles of cash” at home because the financial measures were barring her from basic banking services.Hong Kong authorities have moved quickly to employ the sweeping legislation, which carries sentences as long as life in prison, since it was imposed by China without local debate in June. The police unit tasked with enforcing the measure has so far arrested 32 people, most for allegations related to slogans, banners or Internet posts deemed to be secessionist or seditious.(Updates with market moves, add chart, background)For more articles like this, please visit us at bloomberg.comSubscribe now to stay ahead with the most trusted business news source.©2020 Bloomberg L.P.