Hong Kong authorities have arrested eight securities brokers and hedge fund staff in a major insider-trading investigation involving HK$315mn in alleged profits. The Independent Commission Against Corruption and Securities and Futures Commission announced the arrests on Thursday, targeting senior executives at two licensed firms who allegedly accepted bribes exceeding HK$4mn for confidential share placement information.

Authorities raided offices and homes, uncovering a scheme where advance knowledge of share placements enabled profitable short positions. When new shares hit the market, prices typically fall, allowing traders with inside information to profit. Guotai Junan International confirmed its Hong Kong headquarters was searched and one employee detained, causing its shares to drop over 5%.

The crackdown follows Hong Kong's 2024 enforcement actions against banker-hedge fund communications regarding block trades. Regulators have also raised concerns about IPO paperwork quality amid record application volumes. This case represents one of the territory's most significant insider-trading investigations in recent years.