China’s A-Share Market Overhauls Trading Rules in Big Reform
On July 6, 2026, the Shanghai Stock Exchange (SSE), Shenzhen Stock Exchange (SZSE), and Beijing Stock Exchange (BSE) simultaneously implemented a comprehensive revision of their trading rules, marking one of the most significant overhauls of China’s A-share market framework in recent years. The new rules introduce multiple core adjustments including the expansion of after-hours fixed-price trading, adjustment of price limits for risk-warning stocks, optimization of fund closing mechanisms, and the introduction of a market maker system on ChiNext, according to Xinhua News Agency.
Background and Regulatory Context
The revised rules were first published for public comment on April 10, 2026, by the three exchanges. After approval by the China Securities Regulatory Commission (CSRC) on April 24, the market underwent over two months of technical and business preparation before implementation. The reforms represent a systematic effort to align China’s capital market trading framework with international standards while maintaining safeguards for its predominantly retail investor base, which numbers over 250 million accounts.
Key Changes to Trading Mechanisms
Expansion of After-Hours Fixed-Price Trading
One of the most consequential changes is the significant expansion of after-hours fixed-price trading. Previously limited to the SSE’s STAR Market and the SZSE’s ChiNext board, the window from 15:05 to 15:30 daily is now open to all A-shares and ETFs listed on the Shanghai and Shenzhen exchanges. The Beijing Stock Exchange has introduced after-hours fixed-price trading for the first time. As CCTV Finance reported, this expansion provides investors with additional trading time, helping meet portfolio rebalancing and allocation needs while improving market stability by offering long-term funds a more diversified trading channel.
Professor Tian Lihui of Nankai University noted that the expansion “provides a separate trading channel for large funds to avoid intraday price impact,” as quoted by Xinhua News Agency.
ST Stock Price Limit Adjustment
In a move that has drawn significant attention, the price fluctuation limit for main board risk-warning stocks (designated ST and *ST) has been raised from 5% to 10%, aligning them with ordinary main board stocks. This adjustment, which trended on Weibo’s hot search list under the topic “A-shares to cancel 5% price limit,” addresses a long-standing market anomaly.
Columnist Liu Boyu of Guancha.cn described the change as “a microcosm of the A-share trading system moving from differentiated control to rule unification, from administrative protection to market pricing.” The 5% limit had created a well-documented “one-character board” phenomenon, where stocks would experience consecutive limit-up or limit-down days with minimal trading volume, trapping investors unable to exit positions.
Fund Closing Mechanism Optimization
The SSE has changed its fund closing mechanism for ETFs, shifting from continuous auction to collective auction during the final three minutes of trading (14:57-15:00). During this closing auction period, no order cancellations are permitted, and all orders are matched in a single batch at the close. This aligns fund closing procedures with the existing stock closing mechanism and is designed to improve the stability and representativeness of closing prices.
ChiNext Market Maker System and Block Trading
The SZSE has introduced a market maker system for ChiNext (Growth Enterprise Board) stocks, designed to improve liquidity and price discovery for small-to-medium cap companies. Detailed implementation guidelines are expected to be released separately. Additionally, ChiNext block trading has been shifted from post-market confirmation to real-time intraday confirmation, aligning it with the STAR Market approach.
Beijing Stock Exchange Reforms
The BSE’s changes include the introduction of after-hours fixed-price trading, adjustments to large-trade price ranges for stocks without price limits, and new serious abnormal fluctuation monitoring provisions. Under the new rules, a stock is considered to have serious abnormal fluctuations if it experiences three same-direction abnormal fluctuations within 10 trading days, or cumulative deviation of +150% or -60% within 10 days.
Analysis and Implications
The reforms reflect a deliberate, gradualist approach to market liberalization. Each measure is paired with corresponding safeguards, reflecting the regulatory philosophy of “changing what can be changed first, waiting for what needs to wait.”
For institutional investors, the expanded after-hours trading window provides a dedicated channel to execute large orders at closing prices without impacting intraday prices. This is particularly significant for pension funds and insurance companies that manage large portfolios requiring periodic rebalancing.
For retail investors, who comprise over 95% of China’s 250 million account holders, the changes require adjustments to trading habits. The new closing auction mechanism means orders placed in the final three minutes cannot be canceled, while the expanded ST stock limits introduce both opportunities and risks.
Industry insiders cited by CCTV noted that the optimization of trading rules “is an important part of capital market infrastructure development,” adding that market liquidity, price discovery functions, and investor trading experience are expected to improve as the mechanisms mature.
What to Watch For
The introduction of the ChiNext market maker system raises questions about specific implementation details and incentives. Additionally, some analysts and lawmakers have suggested that these reforms lay the groundwork for potential future changes, including possible T+0 pilots on select blue-chip stocks. The BSE has also indicated that certain provisions will have implementation dates announced separately due to ongoing technical preparation needs.
As the market adapts to these sweeping changes, the first few trading days under the new rules may see increased volatility. However, the direction of reform is clear: China’s A-share market continues its deliberate march toward greater market orientation and alignment with international standards.