^{Photo: Bloomberg.com}

Trading Activity Reaches Uncharted Territory

China’s equity rally is attracting heightened regulatory attention after trading activity surged to historic highs, reigniting concerns about speculative excess and financial stability. Over the course of three consecutive sessions last week, daily turnover across the Shanghai, Shenzhen, and Beijing stock exchanges climbed to new records.

According to market data, total trading volume peaked at nearly 4 trillion yuan in a single day, equivalent to more than half a trillion U.S. dollars. That figure surpassed the previous all-time high set just months earlier, underscoring the extraordinary pace at which investor participation has accelerated.

The surge in turnover coincides with a strong run in benchmark indices. The CSI 300 index recently touched a four-year high and has delivered its strongest annual performance since 2020, fueling optimism that China’s long-awaited equity recovery may finally be gaining traction.

Memories of Past Excess Resurface

Veteran investors say the current environment has stirred uncomfortable comparisons with China’s 2015 stock market boom and subsequent crash. Back then, soaring turnover, rampant margin borrowing, and retail-driven speculation ended abruptly in a sharp market correction that erased trillions in value.

While today’s backdrop differs in important ways, regulators appear keen to prevent a repeat. Officials have moved quickly to curb leverage, signaling unease about the speed and intensity of recent gains rather than the rally itself.

Regulators Clamp Down on Margin Financing

In a clear sign of concern, authorities tightened margin financing rules across all three mainland exchanges. Under the updated framework, the margin requirement for new credit-based stock purchases has been raised to 100 percent from 80 percent.

In practical terms, this means investors must now fully fund new share purchases with their own capital, effectively shutting down borrowing for fresh margin trades. Existing margin positions remain governed by previous rules, allowing regulators to cool speculative activity without forcing widespread deleveraging.

Market strategists interpret the move as a targeted intervention aimed at moderating sentiment rather than signaling fears of systemic risk.

Signs of Overheating in Market Indicators

Several market metrics suggest activity has reached overheated levels. Sentiment and activity indices tracking mainland equities have surged above thresholds historically associated with excessive optimism, driven largely by the spike in trading volumes.

Leverage has also climbed rapidly, with margin financing balances rising alongside turnover. Analysts note that in a market dominated by short-term traders, leverage can amplify rallies but also increase vulnerability to sharp pullbacks if sentiment shifts.

Despite the tightening, liquidity support measures are expected to remain in place in the near term, reflecting policymakers’ desire to sustain market confidence while avoiding runaway speculation.

Retail Investors Still Dominate the Rally

One defining feature of China’s equity market is the overwhelming influence of retail investors. Individual traders account for roughly 90 percent of daily turnover in onshore markets, a stark contrast to developed markets such as the United States, where institutions dominate trading activity.

This retail-heavy structure helps explain regulators’ sensitivity to rapid increases in leverage. When sentiment turns, retail-driven markets can reverse quickly, increasing the risk of disorderly price moves.

Foreign investors have stepped up participation as well, with net inflows exceeding $50 billion in recent months. Even so, overseas investors remain a relatively small force compared to the scale of domestic trading and are not the primary drivers of recent volatility.

A Push for a “Slow Bull” Market

Market observers describe the latest policy adjustments as an attempt to engineer a more sustainable rally. By limiting leverage at the margin, regulators aim to dampen speculative excess without derailing broader gains.

Rather than a blanket crackdown, the overheating appears concentrated in specific segments. Technology and artificial intelligence-related stocks, particularly newer listings, have attracted intense speculative interest and outsized trading volumes.

This uneven enthusiasm is visible across China’s exchanges. Growth-oriented boards have surged sharply in recent months, while more traditional benchmarks have posted comparatively modest gains, suggesting the rally remains selective rather than broad-based.

Balancing Momentum and Stability

For now, China’s regulators appear focused on striking a delicate balance. They are seeking to cool the most speculative corners of the market while preserving the positive momentum that has lifted investor confidence after years of underperformance.

Whether these measures succeed in delivering a steadier, longer-lasting bull market will depend on how investors respond to tighter leverage rules and whether trading volumes normalize in the weeks ahead. What is clear is that the era of unchecked enthusiasm is unlikely to be allowed to run too far, too fast.

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