The impact of last week's joint investigation by Hong Kong's Securities and Futures Commission (SFC) and the Independent Commission Against Corruption (ICAC) into the investment banking arms of two Chinese securities firms is now spreading from the regulatory level to the operational level.

Exclusive information obtained by Sina Hong Kong Stocks reveals that some foreign institutions, citing compliance concerns, have temporarily suspended trading cooperation with CITIC SEC and GUOTAI JUNAN I as these firms are under SFC investigation. To date, neither CITIC SEC nor GUOTAI JUNAN I has commented on this reaction from foreign institutions.

Event Recap: HK$4 Million Bribe Unveils HK$315 Million Insider Trading Case The origin of this incident traces back to a joint operation codenamed "Fuse" (also referred to by some media as "Circuit Breaker") conducted by the SFC and ICAC from March 10 to 11, 2026.

According to official announcements, investigators searched 14 locations, including the Hong Kong subsidiaries of CITIC SEC and GUOTAI JUNAN I, arresting six men and two women aged between 35 and 60. Among those arrested were senior executives from the two securities firms and a licensed hedge fund, as well as a middleman.

The core of the case points to a covert chain of benefits: senior personnel at the implicated brokerages are suspected of accepting over HK$4 million in bribes from a licensed hedge fund management company. In exchange, they allegedly leaked confidential information about share placements of several Hong Kong-listed companies to the hedge fund before the information was publicly announced.

After obtaining the confidential information, the hedge fund quickly established short positions by short-selling stocks in the market and entering into short equity swap contracts. When the share placement news became public and the stock prices of the relevant companies fell, the hedge fund closed its positions, reportedly realizing illegal profits estimated at approximately HK$315 million.

GUOTAI JUNAN I confirmed in an announcement that an employee (later identified as Pan Jupeng, head of the equity capital markets department) was detained by the ICAC, and the company has immediately suspended all his duties and authority. The company emphasized that its overall business and operations remain normal.

On the same day, CITIC SEC confirmed in an announcement that its Hong Kong subsidiary's office was searched, some documents were taken, and an employee was questioned by the ICAC. The company also stated that its operations are normal and all business activities are proceeding as usual.

Latest developments suggest the investigation scope may still be widening. According to media reports, Shen Yin, a vice president of bond sales in the fixed income department of DBS Bank, has had her license suspended. The suspension is reportedly related to the aforementioned case, with market rumors suggesting Shen Yin is the spouse of the detained GUOTAI JUNAN I executive, Pan Jupeng. DBS Hong Kong responded that it will cooperate with the investigation and clarified that the incident is unrelated to the individual's role at the bank.

This joint enforcement action represents a targeted strike by Hong Kong regulators against potential misconduct behind the IPO boom. Now, as some foreign institutions opt for a "temporary wait-and-see" approach out of compliance prudence, the effects of this regulatory storm are beginning to ripple from the individual case level to the business ecosystems of the involved institutions.