Hang Seng Tech’s Proposed 50-Stock Overhaul Could Redirect Billions Toward China’s New Growth Engines

The existing Hang Seng Tech Index was created to represent the 30 largest eligible technology companies listed in Hong Kong. It has grown into one of the market’s most important benchmarks: assets in products passively tracking the index increased from approximately US$1.5 billion at its launch in 2020 to US$40.4 billion by June 2026. Yet Hong Kong’s technology universe has changed faster than the index methodology. In 2021, internet and e-commerce companies accounted for 53.7% of the number of stocks in the eligible technology universe. By the first half of 2026, their combined share had fallen to 31.3%, while companies associated with autonomous technologies represented 32.1%. The development of Chinese AI models, semiconductors, robotics, smart vehicles and advanced manufacturing has created a much broader investable technology market than the platform-led universe of six years ago.

Under the proposal, fixed sector requirements would be removed because technology businesses increasingly operate across traditional industry boundaries. Six revised themes would cover digital platforms and solutions, artificial intelligence, advanced hardware, robotics and automation, cloud computing, and frontier technology. The underlying sub-themes would expand from 16 to 24, adding areas such as AI infrastructure, AI applications, new energy-storage materials, aerospace and satellite technology, quantum computing, brain-computer interfaces and advanced materials. Eligibility would be restricted to members of the Hang Seng Composite LargeCap and MidCap Index to preserve investability. Existing innovation tests would remain: a company must have research and development expenditure equal to at least 5% of sales, annual sales growth of at least 10%, or a technology-enabled business model, alongside the index’s turnover requirements.

The most important methodological change is the proposed two-stream selection process. The first stream would choose the 40 largest eligible companies by market value. The second would fill the remaining 10 positions with companies recording the strongest trailing 12-month sales growth and not already selected in the first stream. This addresses a structural problem in market-cap-weighted indices: younger companies may need substantial investor recognition before becoming large enough for inclusion, even when their businesses are growing much faster than established constituents. Earlier inclusion could improve their visibility, analyst coverage and institutional ownership. At the same time, confining the pool to large- and mid-cap stocks prevents very small or illiquid companies from entering solely because their revenue grew rapidly from a low base.

Hang Seng Indexes’ simulation illustrates the potential financial impact. Expanding the index to 50 companies would reduce the top 10 constituents’ combined weight from 70.6% to 66.3%, while lowering the median constituent market value from HK$118 billion to HK$70 billion. The smallest constituent’s market value would fall from HK$28 billion to HK$7 billion. The 20 additional companies would collectively represent 11.5% of the revamped index: 9.1% from the additional market-value selections and 2.4% from the sales-growth stream. Applied mechanically to the current US$40.4 billion in passive assets, that weight represents approximately US$4.6 billion of gross portfolio reallocation. This is not a forecast of net new investment, but it demonstrates why potential additions could experience substantial index-related trading ahead of the rebalance.

The simulation also reveals the reform’s central trade-off. Companies selected through the sales-growth stream recorded median revenue growth of 82%, compared with 13.8% among existing constituents, but their median 12-month average market value was only HK$29.1 billion. Their median three-month average daily turnover was HK$291.8 million, less than half the HK$650.8 million recorded by the additional market-value selections. Each growth-selected company would have a relatively small median index weight of 0.22%, which limits individual concentration risk, but rapid revenue expansion can reflect acquisitions, unusually weak comparison periods or temporary industry cycles. It does not necessarily indicate positive earnings, cash generation or sustainable returns. The proposed index would therefore become more representative of emerging technology, but potentially more exposed to execution risk and valuation volatility.

Market participants have until September 18, 2026, to respond to the consultation. Hang Seng Indexes expects to announce its decision by the end of September, incorporate approved changes into the review for the quarter ending September 30 and implement related constituent changes in the December 2026 rebalancing. Investors should expect speculation around possible entrants, but the larger structural message is more important than any single company. Hong Kong’s flagship technology benchmark is preparing to move beyond a narrow group of internet platforms and consumer-technology leaders toward an index that also captures China’s expansion in AI, chips, robotics and advanced industrial technologies. If adopted, the overhaul would change both the composition of passive portfolios and the market’s definition of what constitutes a leading Chinese technology company.