SEC Rule 200 of Regulation SHO

Overview and Regulatory Purpose

Short selling — the practice of selling securities that the seller does not own, with the intention of purchasing them later at a lower price and delivering them to the buyer — performs legitimate and economically beneficial functions in the capital markets. 

Short sellers contribute to price discovery by identifying and trading against overvalued securities, provide liquidity by making markets for buyers when sellers are scarce, facilitate hedging strategies for risk management, and enable arbitrage activities that promote price efficiency across related securities and markets. However, short selling without adequate regulation can also facilitate manipulative practices — most significantly naked short selling, in which a seller sells securities it has not borrowed and cannot deliver, artificially increasing the apparent supply of a security and potentially driving down its price without any genuine market basis.

Rule 200 addresses the foundational definitional challenge of short sale regulation: precisely defining which transactions are short sales subject to Regulation SHO's restrictions, and precisely defining when a seller is deemed to own the security being sold for purposes of qualifying a sale as a long sale not subject to those restrictions. 

The rule's deemed ownership provisions are particularly significant because many economically legitimate transactions involve the sale of securities that are not in the seller's physical possession at the time of sale but to which the seller has a contractual or legal right — the seller who has entered an unconditional purchase contract, exercised a conversion right, or exercised an option has a genuine economic ownership interest in the security despite not yet holding the physical shares. Treating these transactions as short sales and subjecting them to Regulation SHO's locate and close-out requirements would impose unnecessary compliance burdens without any investor protection benefit.

Statutory Authority and Rulemaking History

Rule 200 derives its statutory authority from Section 10(a) of the Securities Exchange Act of 1934, which authorises the Commission to prescribe rules and regulations as necessary or appropriate in the public interest or for the protection of investors governing the use of short sales in connection with the purchase or sale of securities registered on a national securities exchange, and from Sections 10(b) and 23(a), which provide the broader anti-manipulation authority and general rulemaking power under which the remainder of Regulation SHO is adopted.

Rule 200 was adopted as part of the original Regulation SHO rulemaking, Securities Exchange Act Release No. 34-50103, published at 69 FR 48029, August 6, 2004, effective January 3, 2005. The original adoption replaced a patchwork of prior short sale rules — including the uptick rule under former Rule 10a-1 and various SRO-specific short sale requirements — with a comprehensive and modernised framework that eliminated the prior uniform uptick rule and replaced it with a more targeted approach to short sale price testing. 

Rule 200 was subsequently amended in August 2007 to add the independent trading unit aggregation provision, and most recently in March 2010 — as part of the rulemaking adopting Rule 201's alternative uptick circuit breaker — to add the short exempt marking requirement under Rule 200(g)(2) that links Rule 200's marking framework to Rule 201's circuit breaker provisions. No amendments have been made to Rule 200 since March 2010, and no pending rulemaking proposes changes to the rule's operative text through June 2026.

Key Provisions and Operative Requirements

Rule 200(a) establishes the foundational definition. The term short sale means any sale of a security which the seller does not own or any sale which is consummated by the delivery of a security borrowed by, or for the account of, the seller. 

This two-part definition captures two distinct forms of short sale. The first — a sale of a security the seller does not own — is the classic naked short sale in which the seller has no beneficial ownership interest in the security at the time of sale and must borrow shares to deliver or purchase shares in the market to cover the position before settlement. 

The second — a sale consummated by the delivery of a borrowed security — captures covered short sales in which the seller has arranged to borrow the security before effecting the sale, giving the transaction the appearance of a legitimate long sale from a settlement perspective while constituting a short sale for Regulation SHO purposes.

Rule 200(b) establishes the six circumstances in which a person is deemed to own a security for purposes of classifying a sale as long rather than short. First, the person has purchased or entered into an unconditional contract, binding on both parties, to purchase the security but has not yet received it — capturing regular-way purchase transactions that have been executed but not yet settled. Second, the person owns a security convertible into or exchangeable for the security and has tendered such security for conversion or exchange — capturing conversion transactions where the investor has initiated the exchange but the resulting shares have not yet been delivered. Third, the person has an option to purchase or acquire the security and has exercised that option — capturing situations where the option exercise is complete but physical delivery of the underlying shares is pending. Fourth, the person has rights or warrants to subscribe to the security and has exercised those rights or warrants. Fifth, the person holds a security futures contract to purchase the security and has received notice that the position will be physically settled and is irrevocably bound to receive the underlying security. Sixth, the security to be delivered is a security of the same class and series as a security owned by the person selling it, the person intends to deliver the owned security, and delivery of the owned security can be made within the standard settlement period.

Rule 200(c) addresses the specific situation of short sales made against the box — transactions in which a person holds a long position in a security and simultaneously sells that same security short, maintaining offsetting long and short positions. A person making a sale against the box — where the person holds a long position at least equal to the short sale — is deemed to own the security for Rule 200(b) purposes only if the person intends to deliver the owned security and can make delivery within the standard settlement period. Where the person does not intend to deliver the long security — and instead intends to borrow shares to cover the short sale while holding the long position — the sale is classified as a short sale subject to Regulation SHO's restrictions.

Rule 200(d) and Rule 200(e) extend the deemed ownership concept to specific broker-dealer situations. Under Rule 200(d), a broker-dealer acting as a block positioner is deemed to own the securities in its short position if it acquired the short position while acting as a block positioner and the short position is the subject of offsetting positions created in bona fide arbitrage, risk arbitrage, or bona fide hedge activities. Under Rule 200(e), a broker-dealer unwinding an index arbitrage position involving a long basket of stock and short index futures or standardized options is deemed to own the security even if not net long, provided offsetting positions were created and maintained in bona fide arbitrage or hedge activities and the sale does not occur during a period of market-wide circuit breaker conditions.

Rule 200(f) governs net position aggregation. In order to determine its net position, a broker-dealer must aggregate all of its positions in a security — across all accounts, desks, and divisions — unless it qualifies for independent trading unit aggregation, in which case each independent trading unit aggregates all of its positions to determine its net position. The aggregation requirement prevents broker-dealers from classifying a sale as long based on a long position held in one trading unit while simultaneously holding a net short position across all units — a practice that would allow broker-dealers to circumvent the short sale marking requirements through selective position aggregation.

Rule 200(g) establishes the mandatory order marking requirements. Every broker-dealer must mark all sell orders of equity securities as long, short, or short exempt. A sell order may be marked long only if the seller owns the security within the meaning of Rule 200(b) and will deliver the security on settlement date, or the security to be delivered is in the broker-dealer's possession or the broker-dealer reasonably expects it can be delivered within standard settlement time. A sell order must be marked short if it does not qualify as a long sale or as a short exempt sale. A sell order may be marked short exempt only if the provisions of Rule 201(c) or (d) are met — meaning the order qualifies for one of the exceptions to Rule 201's alternative uptick circuit breaker price test restriction.

Scope of Application

Rule 200 applies to all broker-dealers transacting in equity securities — the defined scope of Regulation SHO. The rule's short sale definition and deemed ownership provisions apply to all equity security transactions regardless of the trading venue — national securities exchanges, alternative trading systems, OTC markets, and any other trading facility. The order marking requirement of Rule 200(g) applies to every sell order in an equity security that a broker-dealer accepts from a customer or effects for its own account, without exception based on transaction size, security type within the equity securities category, or the identity of the counterparty.

Relationship to Related Rules and Regulations

Rule 200 is the definitional gateway to the entirety of Regulation SHO. Rule 203's locate requirement — which prohibits broker-dealers from accepting or effecting short sale orders without first locating a source of borrowable shares — applies only to transactions that Rule 200 classifies as short sales. Rule 204's close-out requirement — which requires participants in registered clearing agencies to close out fail-to-deliver positions resulting from short sales — depends on Rule 200's marking classification to identify which settlement failures are attributable to short sale activity. Rule 201's alternative uptick circuit breaker — restricting short sales to prices above the national best bid following a 10% intraday price decline in a covered security — applies only to orders marked short under Rule 200(g), and the short exempt marking under Rule 200(g)(2) provides the link between Rule 200's marking framework and Rule 201's circuit breaker exceptions.

Amendment History and Regulatory Evolution

Rule 200's amendment history reflects the two major post-adoption regulatory developments in the short sale framework. The August 2007 amendment added the independent trading unit aggregation provision of Rule 200(f), addressing the practical compliance challenge of position aggregation for large broker-dealers with multiple trading desks operating with genuine independence from each other. The March 2010 amendment added the short exempt marking requirement of Rule 200(g)(2), linking Rule 200's marking framework to the newly adopted Rule 201 circuit breaker. No substantive amendments have been made since 2010.

The broader short sale regulatory environment has continued to evolve through related but separate Commission rulemaking. The October 2023 adoption of Rule 13f-2 — requiring institutional investment managers to report short sale positions and activity on a regular basis — significantly expanded the public information available about short selling practices without amending Rule 200's definitional or marking framework.

Enforcement Context and SEC Action Patterns

Rule 200 enforcement arises primarily through the order marking requirement — cases where broker-dealers have systematically marked short sale orders as long, enabling customers to sell securities short without triggering the locate requirement of Rule 203 or the circuit breaker restrictions of Rule 201. FINRA has identified inaccurate order marking as a recurring examination finding in broker-dealer financial and operational reviews, noting that marking failures frequently reflect inadequate position aggregation systems that misclassify net short positions as long.

The Commission and FINRA have brought enforcement actions against broker-dealers that marked short sale orders as long without the seller having genuine deemed ownership of the securities being sold — most commonly in the context of failed conversion transactions, exercises that had not yet been completed, and purchase contracts that were conditional rather than unconditional. These marking failures are treated as independent Rule 200 violations in addition to any Rule 203 locate failures that result from the broker-dealer effecting short sales without completing the required locate.

Examination Relevance and Key Takeaways

Rule 200 is examined at the Series 7 level as the definitional foundation of the short sale regulatory framework. The two-part definition of short sale — a sale of a security the seller does not own, or a sale consummated by the delivery of a borrowed security — and the six deemed ownership circumstances under Rule 200(b) are the primary examination content. The three order marking designations — long, short, and short exempt — and the conditions under which each applies are consistently examined as the practical output of the Rule 200 framework.

The relationship between Rule 200's short exempt marking and Rule 201's circuit breaker — the short exempt designation is available only for orders qualifying under Rule 201(c) or (d) exceptions — is examined in the context of the circuit breaker's investor protection function and the marking framework that implements it.

The key points to retain are these. Rule 200 defines short sale as any sale of a security the seller does not own or any sale consummated by delivering a borrowed security. A person is deemed to own a security in six circumstances — most importantly, under an unconditional purchase contract, after tendering a convertible security, after exercising an option, or after exercising rights or warrants. Broker-dealers must mark all equity security sell orders long, short, or short exempt — long only where the seller owns the security and will deliver it within standard settlement time; short for all other sales not qualifying as short exempt; short exempt only where the order qualifies for a Rule 201 circuit breaker exception. Broker-dealers must aggregate all positions in a security across all units unless independent trading unit aggregation applies. Rule 200 was last amended March 10, 2010 and no amendments are pending through June 2026.