On September 16, 2026, TIANYU SEMI (02658.HK) announced that its first H-share buyback had reduced its public float to 14.99%, dipping below the 15% initial threshold set at listing. From the repurchase date, the company will now operate under the "alternative threshold" — a compliance route requiring a public float market value of no less than HK$1 billion and a public holding ratio of no less than 10%. At the time of the announcement, the company's market capitalization stood at approximately HK$15.88 billion, with a public float of 14.99%, both clearing the alternative benchmark.
It took TIANYU SEMI less than ten months between its December 5, 2025 listing and triggering the alternative threshold. Among the Hong Kong-listed companies that have adopted this new route since the rule change took effect in January 2026, this pace stands out as notably rapid.
What exactly is the alternative threshold, and why did TIANYU SEMI hit it?
From January 1, 2026, the Hong Kong Exchange's revised continuous public float requirements came into force. For Chinese issuers without other listed shares, the original "initial designated threshold" demanded a public float ratio of no less than 25%, or a lower percentage approved at listing (15% in TIANYU SEMI's case). The new "alternative threshold" offers a more flexible path: a public float market value of at least HK$1 billion combined with a public holding ratio of no less than 10%, both of which must be met simultaneously.
TIANYU SEMI's approved initial threshold of 15% was breached on September 15, 2026. On that day, the company first exercised its buyback mandate, repurchasing 56,700 H-shares on the stock exchange. These shares were converted to treasury stock and no longer counted toward the public float, nudging the ratio from above 15% down to 14.99% — a hair's breadth past the boundary. The margin of the breach was minimal, just 0.01 percentage points, but that tiny shift was enough to fall squarely within the rule's switching window.
A comparison: who else has switched, and where does TIANYU SEMI fit?
So far, 12 listed companies have transitioned to the alternative threshold since the new rules took effect, including names like Blue Moon, FIT HON TENG, SHK Properties' finance arm, Deutsche Bank's China unit, and Huishang Bank. What sets TIANYU SEMI apart are two factors: speed and scale. On timing, the company listed in December 2025 and triggered the alternative threshold by September 2026 — a gap of roughly nine and a half months, placing it at the faster end of the spectrum among all those that have made the switch.
On scale, the company's market capitalization of approximately HK$15.88 billion far exceeds the HK$1 billion minimum. This is not a business forced to rely on the alternative threshold to stay compliant due to a small market cap; rather, it's a mid-sized company proactively using buybacks to rebalance its public shareholding structure.
The logic behind the buyback: capital management flexibility and market signals
TIANYU SEMI's repurchase was no spur-of-the-moment move. On May 19, 2026, the annual general meeting granted the board a general mandate to repurchase up to 5,899,042 H-shares. The board approved the H-share buyback plan on September 14, and the first repurchase on September 15 was merely the first step in executing that plan.
In its announcement, the company clearly articulated its rationale for switching to the alternative threshold: to enable the company to buy back shares under the repurchase mandate and to provide greater flexibility for group transactions carried out for capital management purposes. This rationale points to a practical reality: under the 15% initial threshold, there was very little room for buybacks — any repurchase risked triggering insufficient public float. By shifting to the alternative threshold, the compliance buffer expanded from 15% down to 10%, significantly widening the scope for further buybacks.
Market reaction offers additional insight. Following the buyback announcement, TIANYU SEMI's share price rose consecutively on September 15 and 16, surging over 13% intraday at one point. This suggests investors did not read the buyback and threshold switch as a negative signal; rather, they took it as a sign of confidence in the company's own valuation.
The regulatory backdrop and wider implications
To fully grasp TIANYU SEMI's case, it helps to view it against the broader revision of Hong Kong's public float rules. Before 2026, Chinese issuers in Hong Kong faced a hard requirement of 25% public float (or a lower ratio approved at listing). The original intent was to safeguard market liquidity and prevent excessive concentration of ownership. In practice, however, many management teams who believed their shares were undervalued and wished to buy back stock found themselves constrained by the public float ratio, creating a passive situation where the inability to repurchase coincided with falling prices.
The alternative threshold was introduced precisely to address this conflict. The Exchange retained a 10% floor alongside the HK$1 billion market value requirement, striking a balance between flexibility and investor protection. TIANYU SEMI is among the early adopters of this new rule. By completing the switch with a market cap of roughly HK$15.88 billion and a public float of 14.99%, the company not only met its compliance obligations but also unlocked room for future capital management maneuvers.
What TIANYU SEMI's experience demonstrates is that the alternative threshold is not a loophole for small-cap companies. A business with a market value exceeding HK$1.5 billion opting for this route proves the rule's practical value across firms of different sizes. For other Hong Kong-listed companies seeking to execute buybacks at low price points while constrained by public float requirements, TIANYU SEMI's approach offers a workable template to follow.
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