Uptick Rule
The Uptick Rule (originally SEC Rule 10a-1, now superseded by the Alternative Uptick Rule, SEC Rule 201) restricts short selling by requiring that short sales of equity securities be executed only at a price above the current best bid when a stock has declined 10% or more from its prior closing price, preventing cascading short-selling pressure from amplifying market declines. The rule was reinstated in 2010 after being eliminated in 2007.
Key takeaways
- The original Uptick Rule (1938–2007) required every short sale to be executed on an uptick or zero-plus tick (same price as last sale, which was an uptick from a prior trade).
- The current Alternative Uptick Rule (SEC Rule 201) is a circuit breaker triggered only when a stock's price falls 10%+ from the prior close, after which short selling is restricted to prices above the best bid for the remainder of that day and the following trading day.
- The original rule was eliminated in 2007 after an SEC study found minimal evidence of its effectiveness; it was reinstated in modified form in 2010 following the 2008 financial crisis.
- The Alternative Uptick Rule applies to all NMS equity securities and is administered by all exchanges and off-exchange venues uniformly.
- Short sellers and algorithmic trading strategies must monitor for Rule 201 triggers in real-time, as executing short sales at or below the current best bid during a triggered halt constitutes a violation.
Explanation
The Uptick Rule has a long and controversial history in U.S. securities regulation, reflecting the persistent tension between market efficiency arguments (which favor unrestricted short selling as a mechanism for price discovery) and market stability arguments (which favor restrictions on short selling to prevent bear raids and self-reinforcing downward spirals). The rule was originally adopted by the SEC in 1938 under Section 10(a) of the Securities Exchange Act, following concerns that short selling had contributed to the market crashes of 1929 and the early 1930s.
The original Rule 10a-1 required that every short sale of an exchange-listed stock be executed at a price higher than the last reported transaction price (an 'uptick'), or at the same price as the last transaction if that price was itself an uptick from the preceding different price (a 'zero-plus tick'). The practical effect was that short sellers could not aggressively sell into a declining market—they had to wait for a bounce, however brief, before executing. This constraint was intended to slow the pace of short-selling-driven declines and give buyers time to provide stabilizing liquidity.
The SEC's 2004–2007 pilot study on the uptick rule, examining stocks removed from its coverage, found that elimination of the rule had no material negative effect on volatility, liquidity, or price efficiency, and may have slightly improved market quality. Based on these findings, the SEC eliminated Rule 10a-1 in July 2007. The timing proved unfortunate: the 2008 financial crisis saw dramatic, short-selling-driven declines in financial sector stocks, leading to emergency short-selling bans (including a temporary ban on short selling of financial stocks in September–October 2008) and renewed calls for reinstatement of the uptick rule.
The Alternative Uptick Rule (SEC Rule 201), adopted in February 2010, represents a compromise between the efficiency arguments against a permanent uptick rule and the stability arguments for one. Rather than applying to all short sales continuously, Rule 201 activates as a circuit breaker: when any NMS security's price falls 10% or more below its prior closing price on any given day, a 'short sale price test restriction' is triggered for the remainder of that trading day and the following trading day. During the restriction period, short sales may only be executed at prices strictly above the current national best bid (bid+), rather than at or below the best bid. This prevents aggressive short selling into a declining order book but allows short selling at slightly better-than-bid prices.
For trading operations at hedge funds and broker-dealers, Rule 201 compliance requires real-time monitoring of individual stock price movements relative to prior-day closing prices. When a restriction is triggered on a security in which the firm has pending short sale orders or algorithms, those orders must be immediately flagged and repriced to comply with the bid+ requirement. Order management systems (OMS) at most major firms incorporate automated Rule 201 compliance logic that reprices or suspends short sale orders when a trigger is detected. Failure to comply can result in FINRA or SEC enforcement action, including fines and enhanced supervisory requirements.
Example
On March 12, 2020, during the COVID-19 market sell-off, JPMorgan Chase (JPM) fell from its prior close of $112.50 to $98.20 by 10:15 AM—a decline of 12.7%, triggering the Rule 201 Alternative Uptick Rule restriction. For the remainder of March 12 and all of March 13, short sales of JPM may only be executed at prices strictly above the prevailing national best bid. At 11:30 AM on March 12, JPM is trading with a best bid of $95.40. A hedge fund wishing to short 50,000 shares of JPM must therefore submit its short sale order at a minimum price of $95.41 (one penny above the best bid). The fund cannot execute a short sale at $95.40 or lower during the restriction period, even if the market momentarily offers that price. The fund's execution algorithm automatically adjusts its short sale limit prices to $0.01 above the best bid quote in real-time, ensuring compliance while still allowing execution when sellers or other market makers post ask prices close to the bid.
Related terms
Circuit Breaker Day Order Equity Exchange Execution Algorithm Financial Crisis Finra Hedge Fund Liquidity Market Impact Cost Order Book Out Trade