What Is Regulation SHO?

Regulation SHO is a set of rules established by the U.S. Securities and Exchange Commission (SEC) in 2005 to address concerns related to short selling practices in equity markets. The rule was developed to increase transparency, promote market stability, and prevent abusive or manipulative short selling, particularly the problem of “naked” short selling. Regulation SHO applies to all equity securities traded in U.S. markets, including those listed on exchanges and over-the-counter (OTC) markets.

Short selling, when executed properly, contributes to market efficiency by facilitating price discovery and liquidity. However, when improperly used — such as through naked short selling — it can distort markets and harm investor confidence. Regulation SHO was a response to such issues, particularly in the aftermath of volatile trading episodes in the early 2000s.

Key Components

The framework of Regulation SHO is built around several core requirements designed to ensure the integrity of the short selling process. These include:

Locate Requirement (Rule 203(b)(1))

One of the central provisions of Regulation SHO is the “locate” requirement, which mandates that before executing a short sale, a broker-dealer must have reasonable grounds to believe that the security can be borrowed and delivered on the settlement date. This is intended to prevent situations where sellers fail to deliver the securities they’ve sold short, a problem that contributes to settlement failures.

The broker-dealer must document this locate process and retain evidence of the source that provided assurance of borrowability. Acceptable sources include a borrow agreement with another firm, or real-time availability from a clearing firm or securities lender. If the locate requirement is not met, the short sale cannot proceed.

Close-out Requirement (Rule 204)

Regulation SHO also addresses the “close-out” of open fail-to-deliver positions. If a seller fails to deliver securities by the settlement date — typically two business days after the trade date (T+2) — Rule 204 requires that the position be closed out by buying or borrowing the securities by no later than the beginning of regular trading hours on the next settlement day.

In cases where a security has a high number of persistent fails-to-deliver, additional restrictions may be applied under the threshold securities list, which is updated daily by self-regulatory organizations (SROs) like FINRA or the stock exchanges.

Threshold Securities

A threshold security is any equity security that has an excessive number of open fail-to-deliver positions for a sustained period, usually five consecutive settlement days. Once a stock appears on a threshold list, broker-dealers have enhanced obligations to ensure delivery.

Rule 203(b)(3) imposes strict delivery requirements on broker-dealers for these securities. If a participant is responsible for a failure to deliver in a threshold security for 13 consecutive settlement days, it must immediately close out the position by purchasing securities of like kind and quantity.

The threshold list is not an indication of wrongdoing by any one party, but it signals systemic issues in delivery that may be tied to broader market dynamics or problems in locating borrowable shares.

Exceptions and Flexibility

There are certain exceptions and accommodations built into Regulation SHO. For instance, bona fide market makers are exempt from the locate requirement if the short sale is necessary to maintain a fair and orderly market. However, this exemption does not extend to the close-out requirement; market makers must still address fail-to-deliver obligations.

Regulation SHO has also been amended over time to adjust to changing market conditions. For example, the SEC adopted amendments in 2009 in response to the financial crisis, including Rule 201 — the Alternative Uptick Rule — which imposes restrictions on short selling in a security that has dropped more than 10% in a single trading day. Once triggered, short selling in that security must occur at a price above the current best bid for the remainder of the day and the next trading session.

Enforcement and Oversight

The SEC, along with SROs like FINRA and the exchanges, monitors compliance with Regulation SHO through regular inspections, enforcement actions, and data analysis. Violations can lead to sanctions, fines, and in serious cases, restrictions on a broker-dealer’s ability to conduct further short sales.

Enforcement of Regulation SHO is crucial for maintaining trust in the financial markets. The rule plays a preventive role by requiring broker-dealers to confirm share availability and a corrective role by mandating timely close-outs of settlement failures.

The Bottom Line

Regulation SHO serves as the primary regulatory framework governing short selling in U.S. equity markets. It was designed to promote transparency, ensure proper settlement of trades, and mitigate the risks associated with abusive short selling practices. By requiring locate and close-out procedures, monitoring threshold securities, and establishing exceptions for legitimate market functions, the rule balances market efficiency with investor protection. As market dynamics evolve, Regulation SHO continues to serve as a key tool for regulatory oversight in the equity trading ecosystem.