A-Share Market Slides Across the Board as Three Pressures Weigh on Investors

Table of Contents

• You might want to know
• Main Topic
• Key Insights Table
• Afterwards...

You might want to know

• What drove the broad decline in A-shares on October 12?
• Could the selling pressure be nearing its end, even if market volatility continues?

Main Topic

A-shares fell broadly on October 12, prompting investors to look for the forces behind the downturn. The market weakness intensified during the afternoon, when the ChiNext Index dropped by more than 2%. By the close, the Shanghai Composite Index was down 0.43%, the Shenzhen Component Index had fallen 2.03%, and the ChiNext Index had declined 2.61%. The session was characterized by widespread losses rather than a uniform retreat: 1,167 stocks rose, 48 hit the daily limit-up, and 4,325 fell.

Despite the overall weakness, several areas moved against the market. Kweichow Moutai (贵州茅台) gained nearly 2% and reclaimed the title of “stock king” after its share price surpassed that of Lianxun Instruments (联讯仪器). Defensive stocks attracted money, with banks notably resilient. Bank of China (中国银行), Industrial and Commercial Bank of China (工商银行), China Construction Bank (建设银行), and China CITIC Bank (中信银行) all reached record share-price highs.

Some media and film stocks also remained active. Xinhua Media (新华传媒) extended its winning streak to 10 consecutive limit-up sessions. H&R Century (欢瑞世纪), Bona Film Group (博纳影业), and Ciwen Media (慈文传媒) each recorded 2 consecutive limit-up sessions. Wind power and solar stocks rose during the session as well, with Suno Energy (首航新能), Tianshun Wind Energy (天顺风能), and Tongda Power (通达动力) hitting their daily limit-up. In contrast, computing-power hardware stocks weakened; Jinan Guoji (金安国纪) and Huazheng New Materials (华正新材), among others, fell to their daily limit-down.

These diverging moves suggest that investors were not simply abandoning equities indiscriminately. Rather, money appeared to be rotating toward defensive sectors and selected themes, while higher-valuation technology-related areas faced pressure. Three explanations have been raised for the decline: weakness in South Korea’s equity market, uncertainty over possible US Federal Communications Commission restrictions, and continued selling linked to investor positioning and fund flows. These explanations are interpretations of the market’s moves, not definitive proof of a single cause.

First, the decline may have followed weakness in South Korean stocks. Reports cited in the market discussion said that trading value in the Korean market had fallen 70% from its peak at the end of May. Foreign investors were withdrawing rapidly, while local retail investors were also leaving the market. This change in participation was accompanied by questions about how much upside remained in the memory-chip trade.

One analyst described the challenge facing many investors, particularly those who had only recently entered South Korea to benefit from the memory-chip rally: “For most investors, especially those who entered the South Korean market recently for the memory-chip trade, the biggest challenge is that much of the easy profit available from this theme has already been made.” When a popular trade appears mature, investors may become more sensitive to disappointing news and reduce exposure. A decline in one market can also affect sentiment elsewhere, especially when investors are reassessing related technology themes. However, the market commentary presents this as a possible influence on A-shares, not as a proven direct cause.

Second, unresolved FCC restrictions may be limiting expectations for technology valuations. A recent research report from Soochow Securities (东吴证券) noted frequent market discussion of a Morgan Stanley report concerning potential restrictions by the US Federal Communications Commission (FCC). The report suggested that 3.2T-generation optical modules were the most likely target and that measures could begin in stages as early as October. If implemented, such restrictions could affect expectations for companies and supply chains associated with advanced optical communications.

The issue matters in part because some technology-related valuations were already elevated. The report put the Science and Technology Innovation 50 Index’s October 9 PE_ttm at 119.52, placing it at the 78.8% percentile since 2020. Those valuation figures may make investors more cautious about the long-term valuation headroom of technology stocks when a significant policy risk remains unresolved.

At the same time, the restriction scenario remained uncertain. The discussion was based on a directional assessment from foreign brokerages rather than a confirmed FCC decision. The next public FCC meeting was scheduled for October 29. Until more information becomes available, investors may continue to price in the possibility of restrictions while recognizing that their scope, timing, and final form are not settled. This gap between potential risk and confirmed policy can itself contribute to cautious trading, particularly in sectors whose valuations depend on future growth expectations.

Third, investor positioning and the source of selling may help explain the pressure. A recent report from Zhongtai Securities (中泰证券) argued that the main sellers in this round were insurance funds and “fixed-income-plus” products. These products combine fixed-income investments with an allocation to assets such as equities. The report described the process of clearing positions as being in its later stage, but not yet complete, and emphasized that the current mix of market participants differs substantially from that in July.

Several comparisons in the report were used to assess who was—and was not—driving the selling. The decline in margin-financing balances was about half the pace seen during the same period in July, while the decline in collateral ratios was also clearly slower. Private discretionary funds, leveraged capital, and quantitative funds had already reduced a substantial amount of exposure. Retail investors had entered the market only to a limited extent since September, and sentiment indicators had fallen to historical lows. The report also found no clear change in the asset scale of qualified foreign institutional investors (QFIIs) or in the share of northbound trading.

Meanwhile, long-term capital continued to flow in considerable amounts into exchange-traded funds tracking the STAR 50, ChiNext, and CSI 2000 indexes. Taken together, these observations led the analysts to consider it unlikely that leverage-driven accounts, quantitative funds, retail investors, foreign capital, or long-term investors were the primary source of selling in this episode. Instead, the report identified insurance funds and “fixed-income-plus” products facing redemptions as the central source of the selling pressure.

Institutional funds had shown a sustained selling trend, and public funds’ technology exposure had also declined substantially. Trading concentration among the top 5% of stocks by turnover fell from a high of about 54% in June–July to a historical average of about 43%. The report singled out insurance and “fixed-income-plus” funds that had increased their technology exposure during the second quarter as especially important to monitor.

Depending on the weighting method used, the correlation between these funds and the technology sector had fallen by about seven to eight tenths from its peak. Even so, it remained about two to three tenths above the normal level for 2025. Analysts estimated that around 20% to 30% of the additional technology positions might still need to be absorbed or unwound. The report’s central message is that the selling process may be approaching its later stage, but it is not necessarily over. In the final phase, intermittent waves of selling can still cause volatility, even as sustained pressure gradually diminishes.

Overall, the market’s decline appears to reflect a combination of international sentiment, unresolved policy risk, and domestic portfolio adjustment. The weakness in South Korea may have influenced risk appetite, while uncertainty around potential FCC measures may have constrained enthusiasm for technology valuations. At the same time, redemption-related selling by insurance and “fixed-income-plus” funds may have added direct pressure to selected stocks and sectors. The available commentary does not establish that any one factor alone caused the fall; rather, it presents several overlapping explanations for investor caution.

Key Insights Table

Afterwards...

The next phase will depend on whether the pressures identified in the market commentary become clearer or begin to ease. Investors will be watching for further information about possible FCC measures, changes in technology-sector positioning, and the pace of redemptions from insurance and “fixed-income-plus” products. The scheduled FCC public meeting on October 29 is one point that could help clarify the policy discussion, although it does not by itself determine how markets will respond.

For now, the evidence points to a market in transition rather than a settled trend. Defensive strength, selective gains in media and renewable-energy stocks, and continuing long-term ETF inflows coexisted with broad declines and pressure on computing-power hardware. If the estimated position-clearing process is indeed in its later stage, sustained selling could gradually weaken; nevertheless, the report cautions that the final phase may still bring repeated swings. Investors assessing the outlook should therefore distinguish between confirmed market data, analyst interpretations, and unresolved policy scenarios.