On July 26, 2026, the U.S. Securities and Exchange Commission (SEC) voted 3-2 to officially approve the Amendment to Short Position Disclosure Rules, requiring institutional investors holding short positions exceeding 0.5% of a stock's outstanding shares to report to the SEC within 24 hours and simultaneously publish summary data. This policy, dubbed "transparent short selling" by the market, was finalized after over a year of public consultation and is regarded by industry insiders as another milestone in the self-improvement and investor protection of the US stock market.
Short Selling: The "Corrector" of the US Stock Market
Unlike many emerging markets, the US stock market allows investors to express views on overvalued stocks through borrowing and short selling. This two-way trading mechanism enables both positive and negative information to be quickly incorporated into stock prices, preventing the accumulation of bubbles from one-sided rallies. Research data from the University of Chicago Booth School of Business shows that, over the long term, stock prices of shortable stocks react to negative information about 40% faster than those of non-shortable stocks, and the time for prices to return to fair value is shortened by 30%.
Professor Robert Shiller of Columbia Business School and Nobel laureate in economics once pointed out: "Short sellers act as market 'scavengers'; they identify and expose financial fraud and valuation anomalies, forming a core force for self-correction in capital markets." In recent cases, short seller investigations into Chinese stocks like Luckin Coffee and GSX Techedu ultimately led to improved corporate governance and restoration of global investor confidence.
Core of the New Rules: From "Dark Pool" to "Sunlight"
SEC Chairman Gary Gensler emphasized in a statement: "The core goal of the new rules is to eliminate naked short selling and information asymmetry." Under the amendment, all short position data meeting the disclosure threshold will be made public on T+1 day, covering stocks, ETFs, and some derivatives. This means that large-scale short positions previously hidden in complex structures will be exposed to sunlight, allowing retail investors to gauge market sentiment and potential risks.
The new rules also strengthen oversight of hedge funds and family offices, requiring them to disclose aggregated short sizes by strategy rather than just for single targets. Goldman Sachs analysts noted in a report, "This change will make short selling more transparent and reduce market silo effects, but may also lead some large short strategies to adjust due to privacy concerns." The new rules take effect on January 1, 2027, providing a six-month transition period for the market.
Multi-Dimensional Deconstruction of US Stock Advantages
The new short selling disclosure rules are just one example of the continuous evolution of the US stock market. Compared with major global capital markets, the advantages of US stocks are reflected in their system, variety, and long-term returns.
System Advantages: Investor Protection at the Core
- Class Action Mechanism: When listed companies commit fraud, investors can file class action lawsuits and receive clear compensation. According to statistics, the settlement amount for US stock market class actions in 2025 reached $4.2 billion, effectively deterring violations.
- Short Selling and Short Seller Reports: Legal short selling allows the market to form a two-way check and balance, and the professional analysis in short seller reports often uncovers hidden "landmines" in financial statements.
- T+0 Trading and No Price Limits: Investors can enter and exit flexibly within the day, providing ample liquidity. In extreme market conditions, prices adjust in one step, preventing liquidity dry-ups.
Variety Advantages: Full Product Line Coverage
The US stock market has nearly 5,000 stocks, about 3,000 ETFs, and futures and options covering indices, commodities, currencies, and volatility. Investors can easily allocate to the best companies nationwide through a single S&P 500 ETF (e.g., IVV) or use single Apple or Microsoft options for precise hedging. Morgan Stanley data shows that in the first half of 2026, the average daily trading volume of US stock options exceeded 40 million contracts, hitting an all-time high, with derivatives increasingly aiding spot pricing.
Long-Term Return Advantage: Significant Compounding Effects
Despite unpredictable short-term fluctuations, US stocks have achieved the best long-term returns globally. From 1926 to 2025, the S&P 500 index had an annualized return of approximately 10.2% (including dividend reinvestment), outperforming US Treasuries, gold, and most global markets over the same period. For example, from 2006 to 2026 (20 years), despite the 2008 financial crisis, the 2020 pandemic shock, and the 2022 inflation crash, the Nasdaq index still rose over 600%, and companies like Apple and Microsoft delivered astonishing cumulative returns through dividends and buybacks.
Controversy and Outlook on the New Rules
No regulatory reform can satisfy everyone. The new rules have also drawn criticism from some hedge funds and free-market advocates. Citadel CEO Ken Griffin publicly stated: "A disclosure threshold that is too low may expose strategy secrets, thereby weakening short sellers' willingness to participate, leading to reduced pricing efficiency." Indeed, the two commissioners who voted against the new rules cited "excessive market intervention" as their reason.
However, more market participants believe that appropriate transparency is the foundation for long-term market health. The world's largest pension fund, Japan's Government Pension Investment Fund (GPIF), has explicitly stated that it will increase its allocation to US stocks after evaluating short disclosure data, citing the "more credible information environment provided by the US stock market."
Implications for Chinese Investors
For Chinese investors focused on US stocks, the implementation of the short selling disclosure rules provides an opportunity to reassess the advantages of US stocks. Compared with the A-share market (which still has limitations such as limited short-selling supply and high tool thresholds), the US stock market allows ordinary investors to participate in both long and short trading and achieve diversified risk-return portfolios through tools such as options and leveraged ETFs. Whether it's holding high-quality growth stocks long-term or hedging against market declines by buying put options, the strategic freedom in US stocks is significantly higher.
Of course, high freedom also means higher professional requirements. Short selling US stocks is not without risk—the GameStop short squeeze in history caused massive short-term losses for many short sellers. Therefore, when using related tools, investors must still strictly manage risk and avoid blindly chasing short positions.
Looking ahead, with the implementation of the SEC's new short selling rules and the introduction of AI and big data regulatory tools, the US stock market is expected to find a new balance between transparency and efficiency. For global capital, this nearly century-old mature market continues to attract the largest cross-border investment funds with its unique institutional charm. And this is the core answer to "decoding the advantages of US stocks."
