HONG KONG, June 7 (Reuters) - Activist investors who have made their names and fortunes exposing fraud at overseas-listed Chinese companies signaled a ratcheting up of short-sell campaigns in Hong Kong on Wednesday, as they revealed their latest bets against China-based firms.

Short-sell campaigns have gained pace in Hong Kong in recent years, with an uptick that investors say underscores persistent problems with governance, disclosure and specifically market manipulation, which they say is not being tackled by regulators.

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