Key Takeaways
- Regulation SHO prevents naked short selling abuses.
- Broker-dealers must locate shares before shorting.
- Circuit breaker restricts short sales after 10% drop.
- Fails-to-deliver must be closed by next settlement day.
What is Regulation SHO Explained: Short Sale Rules and Key Requirements?
Regulation SHO is an SEC rule established in 2005 that governs the short sale of equity securities to prevent abusive practices like naked shorting and reduce failures to deliver. It mandates broker-dealers to locate shares before executing a short sale and imposes price restrictions during market volatility.
This regulation applies broadly to equity securities and aims to enhance market stability by ensuring proper settlement and discouraging manipulative trading techniques.
Key Characteristics
Regulation SHO enforces several critical rules to control short selling risks:
- Marking Requirement: All sell orders must be marked as "long," "short," or "short exempt" to ensure proper trade classification under sale regulations.
- Locate Requirement: Broker-dealers must have reasonable grounds to believe shares are available for borrowing before shorting, preventing naked short sales.
- Short Sale Price Test Circuit Breaker: If a stock falls 10% or more during the trading day, short sales cannot be executed at or below the national best bid to curb rapid price declines.
- Close-Out Requirement: Fails-to-deliver must be closed out by the next settlement day, especially for threshold securities with persistent delivery failures.
How It Works
Before you execute a short sale, Regulation SHO requires your broker to confirm the availability of shares to borrow, ensuring that delivery obligations will be met on settlement day. This locate process helps prevent failures to deliver, which can distort market prices.
During volatile market conditions, the short sale price test circuit breaker activates, temporarily restricting short sales at or below the best bid price to reduce downward price pressure. Broker-dealers must also promptly close out any delivery failures, with stricter rules applying to securities identified as threshold securities due to repeated fails.
Examples and Use Cases
Regulation SHO impacts various market participants and securities in practical ways:
- Technology ETFs: Investors shorting ETFs like SQQQ must comply with locate and marking requirements to avoid naked shorting violations.
- Blue-Chip Stocks: Short sellers targeting the SPY ETF must navigate circuit breaker rules during sharp market drops to avoid executing trades below the national best bid.
- Airlines: Companies like Delta often experience threshold security status when persistent delivery failures trigger mandatory buy-ins and borrowing restrictions.
- Low-Cost Funds: When managing exposure to index funds, using guides like best low-cost index funds can help investors understand risks associated with short selling regulated by SHO.
Important Considerations
Compliance with Regulation SHO is essential to avoid regulatory penalties and trading restrictions. Brokers play a key role in enforcing locate and close-out requirements, but investors should understand how these rules affect their short sale strategies.
Be aware that threshold securities face heightened scrutiny, requiring pre-borrowing before shorting again. Monitoring delivery failures and price test triggers can help you manage risk effectively in volatile markets.
Final Words
Regulation SHO enforces strict controls on short selling to enhance market integrity and reduce risks like naked shorting. Review your trading practices to ensure compliance with locate, marking, and close-out requirements before executing short sales.
Frequently Asked Questions
Regulation SHO is an SEC rule adopted in 2005 to govern short selling of equity securities. It aims to prevent abuses like naked short selling, reduce failures to deliver, and promote overall market stability.
Regulation SHO includes four key rules: marking sell orders as long or short, requiring broker-dealers to locate shares before shorting, enforcing a short sale price test circuit breaker during sharp price drops, and mandating close-out of fail-to-deliver positions promptly.
Under Rule 203, broker-dealers must have reasonable grounds to believe shares can be borrowed before executing a short sale. This prevents naked shorting by ensuring shares are available to deliver at settlement.
Rule 201 triggers a circuit breaker if a stock price drops 10% or more intraday, prohibiting short sales at or below the national best bid. This helps prevent excessive downward pressure during volatile trading.
A threshold security has persistent fails-to-deliver of 10,000 shares or more for five consecutive settlement days. Broker-dealers face stricter rules, including mandatory buy-ins and a ban on short selling without borrowing until delivery fails are resolved.
Rule 204 requires broker-dealers to close out fail-to-deliver positions by the next settlement day (T+2). For threshold securities, the rules are stricter, requiring pre-borrowing and prompt buy-ins to clear fails.
Regulation SHO applies to all short sales of equity securities in the U.S. market, including broker-dealers and investors engaging in short selling, ensuring they follow locate, marking, price restrictions, and close-out requirements.
By enforcing proper order marking, requiring share locates, curbing naked short selling, and promptly closing delivery failures, Regulation SHO helps maintain accurate pricing, investor confidence, and a fair trading environment.

