Hong Kong stock regulator flags more companies for share concentration

Hong Kong's securities regulator has been highlighting instances of excessive shareholding concentration this year, according to market analysts who view it as a cautionary sign about potential volatility in small-cap stocks. As of August, the Securities and Futures Commission (SFC) had identified 13 such cases on the Hong Kong stock exchange, down from 15 during the entire previous year and 10 for all of 2024, and just one in 2023.

For instance, the controlling shareholder and an additional 18 investors of Desun Real Estate Investment Services Group, a property management firm based in Sichuan, held a combined 99.53 percent of the company's total issued shares as of July 21, as announced by the SFC on Monday. These companies, which the regulator cited, were small- and mid-cap stocks with market values ranging from HK$600 million (US$89 million) to HK$9 billion.

The regulator cautioned that concentrated ownership makes it possible for even modest trades to cause significant price fluctuations. Analyst Andrew Lam of audit firm BDO noted that market funds and investor attention are concentrated on "A plus H" listings – firms with both Hong Kong shares (H shares) and A shares listed on the mainland Chinese market – as well as biotech companies and specialist tech leaders.

He added that smaller, traditional firms with limited daily trading activity are particularly vulnerable to this concentration. Although an SFC alert does not necessarily indicate illegality, it can lead to heightened volatility in stock prices, which often decline for one to two months following the warning. Mike Leung, Investment Manager at Wocom Securities, explained that while an SFC alert doesn't imply wrongdoing, it often results in increased price volatility.

For example, Desun's share price surged 92.3 percent to HK$7.50 on July 21, from HK$3.90 on July 2, following the regulator's alert. Transtech Optelecom Science, a supplier of fiber-optic cables, saw its share price fall by 23 percent the day after being listed in June. Similarly, Aceso Life Science, listed in January, has had its shares suspended since July due to delayed publication of its 2026 annual results.

According to Lam, as Hong Kong is an international financial hub, the regulators aim to prevent such high concentration from persisting. "A robust market requires a broad and diverse base of public shareholders to ensure continuous trading volume and fair, transparent, and representative pricing," he said.