The Shanghai Stock Exchange is moving to dismantle a decade-old safeguard that artificially suppressed volatility in its most distressed listed companies. By proposing to double the daily price limit for Special Treatment (ST) stocks from 5% to 10%, regulators are signaling a fundamental shift in how they view market discipline and investor protection.
Since 2012, these narrow limits served as a buffer zone designed to protect retail investors from the wild swings often seen in loss-making or financially irregular firms. However, what began as a protective measure gradually morphed into a liquidity trap that distorted price discovery and allowed speculative shell trading to flourish at the expense of market efficiency.
Under the outgoing regime, ST stocks frequently hit their daily limits instantly, resulting in one-word boards where trading volume effectively evaporated. This made it nearly impossible for trapped investors to exit during bad news or for the market to accurately price the true risk of insolvency, effectively keeping zombie companies on life support through artificial price stability.
The change is not merely technical but philosophical, aligning the main board with the broader registration-based IPO reform. By mirroring the rules of healthier stocks, regulators are dismantling the dual-track system that previously existed between the main board and the more flexible tech-heavy indices like the STAR Market and ChiNext.
For years, the narrow 5% band made it relatively cheap for speculative capital to lock prices at a limit. Doubling that range significantly increases the capital cost and risk for those attempting to corner the market, thereby discouraging the irrational shell hunting that has long characterized the more speculative corners of China’s equity markets.
Perhaps the most critical implication is the acceleration of market exits. Under a 10% limit, failing companies will likely see their share prices plunge toward the critical 1-yuan delisting threshold much faster than before, clearing the way for a more dynamic and efficient allocation of capital across the A-share ecosystem.