On November 6, the Shenzhen Stock Exchange and Shenzhen Securities Information Co., Ltd. issued an announcement outlining a new round of optimization for the ChiNext Index compilation methodology, with the weight cap for a single constituent gradually adjusted to 15%. This revision will take effect during the regular adjustment on December 14, 2026.
This marks the second weighting structure optimization for the ChiNext Index in just one year, following the initial introduction of a weight cap mechanism last year.
Reviewing the Two-Step Evolution
Looking back, the ChiNext Index's "evolution" has progressed through two steps. Last year marked the first step, when the index introduced a single-stock weight cap mechanism for the first time. By setting weight adjustment factors, the weight of any single constituent was kept below 20% during each regular adjustment, reining in the influence of individual constituent stocks on the index within a reasonable range. A complementary ESG negative screening mechanism was also introduced, explicitly excluding companies rated below B by the Guozheng ESG rating, which helps reduce the probability of major negative risk events.
This year marks the second step, with a more focused direction 鈥?further lowering the weight cap for constituent stocks. According to the announcement, during each regular adjustment period, if the actual weight of the largest constituent stock approaches or exceeds 14.5%, its actual weight will be increased by 0.5 percentage points and rounded up to determine the adjusted single-constituent weight cap. During the adjustment period, the weight cap and weight adjustment factors can only be lowered, not raised, gradually converging the target cap from 20% to 15%, rather than immediately compressing individual stock weights to 15% upon first implementation.
Market Perspective on the Optimization
Market observers noted that the ChiNext Index's further optimization of compilation rules, enhancing sample quality through weight cap controls, is essentially about continuously managing the risk of excessive concentration in a single constituent's weight. This allows the index to more objectively reflect the overall performance of the ChiNext board and avoid a situation where a handful of heavyweight stocks dominate.
Through two rounds of compilation methodology optimization, the ChiNext Index is steadily polishing its credentials as a "growth benchmark."
Related ETF Products
Currently, ETF products tracking the ChiNext Index include the ChiNext ETF by E Fund (159915, feeder funds A/C/Y: 110026/004744/022907). It is one of the first batch of ETFs in the market to track the ChiNext Index and remains the only ChiNext ETF product with linked ETF options. The ETF adopts the lowest-tier management fee rate of 0.15% per year in the market, helping investors gain low-cost exposure to the development opportunities of innovative and entrepreneurial enterprises.
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