--- title: "Major Indices Including CSI 300 and STAR 50 Set for Rebalancing: Analysis of Five Key Focus Areas" type: "News" locale: "en" url: "https://longbridge.com/en/news/288138901.md" description: "The rebalancing of over ten indices, including the CSI 300, will take effect on June 12. The highlight of this adjustment is the significant increase in the representation of \"new quality productive forces,\" with a notable rise in the weighting of the new economy. For instance, the STAR 50 Index will include four stocks: Hua Hong, Yuanjie Semiconductor, Moore Threads, and MetaX, boosting the weight of hard technology and other new quality productive forces" datetime: "2026-05-30T08:36:11.000Z" locales: - [zh-CN](https://longbridge.com/zh-CN/news/288138901.md) - [en](https://longbridge.com/en/news/288138901.md) - [zh-HK](https://longbridge.com/zh-HK/news/288138901.md) --- # Major Indices Including CSI 300 and STAR 50 Set for Rebalancing: Analysis of Five Key Focus Areas On May 29, the Shanghai Stock Exchange (SSE) and China Securities Index Co., Ltd. announced the periodic adjustments to the constituents of several core indices. The adjustments involve more than ten indices, including the CSI 300, CSI 500, CSI 1000, CSI A50, CSI A100, CSI A500, SSE 50, SSE 180, SSE 380, and STAR 50. These index adjustments will take effect after the market close on June 12. The rebalancing of more than ten indices has drawn market attention. Why are indices rebalanced? What are the criteria for inclusions and exclusions? What impact will these adjustments have on investment? Fund News interviewed industry insiders to provide insights into five key areas of concern. ## Focus 1: What is the most significant change in this rebalancing? Industry sources revealed that a notable change in this adjustment is the significantly improved coverage and representativeness of "new quality productive forces" within the indices after the rebalancing. For example, after the rebalancing, the weighting of new economy sectors such as information technology, healthcare, and communication services in the SSE 50 and SSE 180 indices reached 28% and 26%, respectively, representing increases of approximately 3% and 1% compared to before the adjustment. The market capitalization coverage of the STAR Board by the STAR 50 and STAR 100 indices increased by 6% compared to previous levels. In terms of specific adjustments, the CSI 300 Index replaced 19 constituents, adding stocks such as Huagong Tech and Longsys. The weighting of information technology and communication services increased. The SSE 50 Index added TBEA, Shengyi Technology, Aluminum Corporation of China, Huatai Securities, and GigaDevice, raising the proportion of new economy sectors. As for the STAR 50 Index, four stocks—Hua Hong, Yuanjie Semiconductor, Moore Threads, and MetaX—were added, increasing the weighting of hard technology and other new quality productive forces. ## Focus 2: Why is index rebalancing considered "following the rules"? Why are there inclusions and exclusions in indices? This goes back to the purpose of index compilation. Generally, index rebalancing aims to continuously optimize the constituent structure, and the adjustment process is highly rule-based and transparent. There are two core bases: First, the rules are public and accessible, leaving no room for information asymmetry. The index compilation methodologies are fully disclosed on the official websites of the SSE and China Securities Index Co., Ltd. Key information such as the sample space, selection rules, and rebalancing cycles is open and transparent to the entire market. All investors are equal before the rules. Second, the standards are objective and quantifiable. Adjustments are primarily based on quantifiable objective indicators such as average daily total market capitalization and average daily turnover rankings, rather than short-term stock price fluctuations. As long as listed companies continue to meet the market capitalization and liquidity thresholds, their inclusion in the index is an inevitable result of the rules and an objective reflection of the consensus among all market participants. This means that index rebalancing is the result of market-driven choices made by all parties involved. ## Focus 3: Why is rebalancing necessary? Since there are inclusions, there must necessarily be exclusions. Some may even question the basis for including or excluding stocks from indices. This is actually a two-way "optimal solution" from investment to industry. From the perspective of index construction, periodic rebalancing through "shedding the old and bringing in the new" can timely reflect changes in the capital market structure, promote the renewal of constituents, keep the index positioning on track, and ensure good market representativeness. From the perspective of industrial representativeness, the timely inclusion of high-quality leading enterprises dynamically reflects changes in the industry structure of the capital market, which has positive significance for the long-term contribution to index returns. From the perspective of investors' long-term returns, only by keeping the index representative and advanced, keeping pace with the times, can investors truly share in the dividends of economic growth and industrial upgrading through indexed investment. Index rebalancing in recent years shows that it is precisely because of the continuous optimization and ability to keep pace with the times of the index constituent structure that the returns of related index-tracking products remain competitive. ## Focus 4: What is the core logic behind index rebalancing? In fact, the core of index investment lies in buying a "basket" of core assets representing the direction of China's economic development. Its essence is to capture macro trends based on long-term allocation logic. The increase in the weighting of technology and the new economy in core broad-based indices is an objective reflection of the transformation of the A-share market structure towards high-quality development. It is also what is expected of the capital market in serving the real economy and supporting technological self-reliance. "In the short term, there may be some outflows of passive tracking capital," pointed out an industry insider. "It is important to know that the 'total pool' of products remains unchanged. The multi-level index system determines that 'exclusion does not mean complete exit.' Correspondingly, when passive funds flow out of Company A from some indices, it often means that funds from other covering indices, industries, or other themes will follow suit." It is worth noting that index rebalancing, as a periodic "routine operation," involves limited weighting of included and excluded constituents in the index, and the corresponding rebalancing mechanism is relatively mature and complete. In the short term, the capital flows caused by rebalancing are transient and predictable, so there is no need for excessive anxiety. Historically, there is no uniform pattern in the short-term performance of included and excluded constituents after each adjustment announcement. The market has formed rational expectations about the index rebalancing mechanism and has sufficient time to digest the impact, which is limited in magnitude. More importantly, public fund management companies managing index funds have a series of response plans for index rebalancing to reduce market impact and product tracking errors. Investors do not need to worry excessively about normal rebalancing operations. The aforementioned industry insider stated that as regulators continue to guide long-term assessment mechanisms, the medium-to-long-term orientation of assessments for large public funds, insurance companies, and other "long-term capital" has become more prominent. The market will pay more attention to long-term investment value, industry and corporate fundamentals, rather than technical gaming around a single rebalancing event. ## Focus 5: What impact will index rebalancing have on individual stocks and passive investments such as ETFs? This is the topic investors are most concerned about: How will index rebalancing affect individual stocks and passive funds such as ETFs that track the indices? In fact, index rebalancing is based on objective indicators at a specific point in time and does not affect the true trend of a company's fundamentals thereafter. In terms of individual stock prices, they essentially reflect changes in company fundamentals and have no direct causal relationship with whether they are included in or excluded from an index. Over a longer time horizon, individual stock price performance depends on the company's own operating conditions and fundamental support. Similarly, being excluded from an index does not mean that the company's fundamentals have deteriorated; it may simply mean that its relative ranking in market capitalization or liquidity temporarily fails to meet the threshold requirements. Some market participants stated that "following the rules" means that if a company's fundamentals continue to improve and it subsequently meets the index inclusion rules again, it will be re-included. In general, indices are "adjusted according to rules," not "chasing stock prices." The inclusion and exclusion of index constituents are not for "bag-holding" or "smashing the market," but to maintain the vitality of the index and accurately reflect the market structure. On the other hand, the basic logic of indexed investment is to acknowledge that market pricing is relatively efficient, representing long-term and value investment. For passive investors, understanding and trusting the open and transparent index rules, viewing short-term price fluctuations rationally, and adhering to long-term allocation through indices may be a more prudent choice. Source: China Fund News ### Related Stocks - [688802.CN](https://longbridge.com/en/quote/688802.CN.md) - [000300.CN](https://longbridge.com/en/quote/000300.CN.md) - [01347.HK](https://longbridge.com/en/quote/01347.HK.md) - [688795.CN](https://longbridge.com/en/quote/688795.CN.md) - [688347.CN](https://longbridge.com/en/quote/688347.CN.md) - [000688.CN](https://longbridge.com/en/quote/000688.CN.md) - [688498.CN](https://longbridge.com/en/quote/688498.CN.md) - [159546.CN](https://longbridge.com/en/quote/159546.CN.md) - [159516.CN](https://longbridge.com/en/quote/159516.CN.md) - [561600.CN](https://longbridge.com/en/quote/561600.CN.md) - [510300.CN](https://longbridge.com/en/quote/510300.CN.md) - [588170.CN](https://longbridge.com/en/quote/588170.CN.md) - [588050.CN](https://longbridge.com/en/quote/588050.CN.md) - [588000.CN](https://longbridge.com/en/quote/588000.CN.md) - [510310.CN](https://longbridge.com/en/quote/510310.CN.md) - [399300.CN](https://longbridge.com/en/quote/399300.CN.md) - [000905.CN](https://longbridge.com/en/quote/000905.CN.md) - [399905.CN](https://longbridge.com/en/quote/399905.CN.md) - [000852.CN](https://longbridge.com/en/quote/000852.CN.md) - [000903.CN](https://longbridge.com/en/quote/000903.CN.md) - [399903.CN](https://longbridge.com/en/quote/399903.CN.md) - [000510.CN](https://longbridge.com/en/quote/000510.CN.md) - [000016.CN](https://longbridge.com/en/quote/000016.CN.md) - [000010.CN](https://longbridge.com/en/quote/000010.CN.md) - [000009.CN](https://longbridge.com/en/quote/000009.CN.md) - [000699.CN](https://longbridge.com/en/quote/000699.CN.md) - [000988.CN](https://longbridge.com/en/quote/000988.CN.md) - [300130.CN](https://longbridge.com/en/quote/300130.CN.md) - [600089.CN](https://longbridge.com/en/quote/600089.CN.md) - [600183.CN](https://longbridge.com/en/quote/600183.CN.md) - [601600.CN](https://longbridge.com/en/quote/601600.CN.md) - [02600.HK](https://longbridge.com/en/quote/02600.HK.md) - [601688.CN](https://longbridge.com/en/quote/601688.CN.md) - [06886.HK](https://longbridge.com/en/quote/06886.HK.md) - [603986.CN](https://longbridge.com/en/quote/603986.CN.md) - [688800.CN](https://longbridge.com/en/quote/688800.CN.md) - [HTSC.UK](https://longbridge.com/en/quote/HTSC.UK.md) - [03986.HK](https://longbridge.com/en/quote/03986.HK.md) ## Related News & Research - [China’s top chip foundries forecast second-quarter growth amid AI boom](https://longbridge.com/en/news/286425575.md) - [BREAKINGVIEWS-SK Hynix rally lobs retail investors into AI fire](https://longbridge.com/en/news/287767060.md) - [ACM Research (ACMR) Valuation Check After Strong Multi Period Share Price Gains](https://longbridge.com/en/news/288140389.md) - [SK Hynix joins $1T club as AI chip boom lifts market](https://longbridge.com/en/news/287812820.md) - [BYD launches Xuanji A3, calls it China’s first 4nm smart driving chip](https://longbridge.com/en/news/288036203.md)