Shares of Powerbridge Technologies Co. Ltd. rocketed 52.0% on massive volume in morning trading Thursday, enough to make them the biggest gainers and most actively traded on major U.S. exchanges, after the China-based software company announced plans to engage in cryptocurrency mining. Trading volume swelled to already-a-record 111.8 million shares, compared with the full-day average of about 3.4 million shares. The company said earlier that it plans to invest and engage

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