Regulation SHO: What Short Sellers Need to Know

Regulation SHO, enacted by the SEC on January 3, 2005, is the primary federal framework governing short selling in U.S. equity markets. Enforced by the SEC and administered through FINRA-member brokers, it sets the rules every short seller operates under — from how shares are borrowed to what happens when a delivery fails.

Who This Applies To

Regulation SHO applies to all short sales of equity securities traded on U.S. national securities exchanges, including NYSE and NASDAQ. It directly affects retail short sellers, hedge funds, and proprietary trading desks. Brokers and clearing firms carry compliance obligations on behalf of their clients, but traders bear the practical consequences: borrow costs, forced buy-ins, and order restrictions.

There are no minimum account size thresholds to trigger Reg SHO — it governs every short sale regardless of size. Market makers receive limited exemptions from the locate requirement for bona fide market-making activity, but most retail and institutional traders have no exemption.

Key Rules

Rule 203 — Locate Requirement

Before a broker can accept a short sell order, it must have a reasonable belief that the shares can be borrowed. In practice, brokers maintain an Easy-To-Borrow (ETB) list that is pre-cleared — typically refreshed pre-market and sometimes intraday. Any stock not on the ETB list is Hard-To-Borrow (HTB) and requires a manual locate.

HTB stocks carry annualized borrow fees that are deducted daily from the short seller’s account. These fees range from roughly 5% on moderately difficult names to well over 100% on heavily shorted stocks. During the meme-stock volatility of May 2021, AMC borrow rates approached 150% annualized. On a $10,000 short position at a 50% HTB rate, the daily borrow cost is approximately $13.70 — a drag that accumulates whether the position moves in your favor or not. If a locate is lost mid-day (because available shares are recalled), some brokers will restrict additional short orders on that security for the remainder of the session.

Rule 204 — Close-Out of Fails-to-Deliver

When a short sale results in a fail-to-deliver, the clearing broker must close out the position by purchasing shares in the open market no later than the open of business on T+2 after the settlement date of the fail. For standard equity trades settling on T+1, this puts the close-out deadline at approximately T+3 from the original trade date — but that arithmetic can shift depending on when in the settlement cycle the FTD is identified.

The forced buy-in happens at the open, at market price — the worst possible timing if the stock is spiking. Any trader whose account results in repeated FTDs on a specific security can be barred from shorting that security without a confirmed pre-borrow arrangement, which is more expensive and harder to obtain than a standard ETB locate.

Threshold Securities List

The Threshold Securities List is published daily by NYSE, NASDAQ, and CBOE by 6 PM ET. A stock earns a spot on the list when aggregate FTDs across all participants reach or exceed 0.5% of total shares outstanding and remain there for five or more consecutive settlement days.

Appearing on the list is not itself a violation — it is a signal. For traders, it serves as a pre-trade warning: elevated FTDs mean borrow availability is strained, forced buy-ins are more likely, and short-squeeze risk is structurally higher. Stricter close-out rules apply to threshold securities, meaning your broker has less flexibility to roll or defer a delivery fail. Checking the list each evening before holding a short position overnight takes less than two minutes and can prevent a forced exit at the worst possible price.

Rule 201 — Alternative Uptick Rule

Rule 201, added in June 2010 after the original uptick rule was eliminated in 2007, creates a circuit breaker triggered by a single-day price decline. When a covered security falls 10% or more from its prior day closing price, the rule activates immediately and remains in effect for the rest of that session and the entire following trading day — two full sessions total.

While the circuit breaker is active, short orders must be priced above the current national best bid. Market short orders are rejected. This is a meaningful distinction from the pre-2007 tick test, which required each individual short sale to be priced above the immediately preceding trade — a tick-by-tick constraint that applied continuously regardless of overall market conditions. Rule 201’s price-test only engages after a 10% drop, but it then locks in for two sessions, which can make it effectively impossible to open new short positions during the most liquid selling windows.

Practical Examples

Scenario 1 — Borrow cost management: A trader shorts 500 shares of SPXU at $15.00 (notional: $7,500). The broker’s HTB list shows a 35% annualized borrow rate. Daily cost: $7,500 × 0.35 / 365 = $7.19. Held for 30 days, borrow costs $215.70 before any price movement is factored in. The trader sets a maximum hold period of 20 days unless the position shows at least $300 in unrealized profit — otherwise borrow cost consumes the gain.

Scenario 2 — Rule 201 activation: The same SPXU position: prior day close was $16.50. Intraday, the stock drops to $14.85 — a 10% decline from $16.50. Rule 201 activates. The national best bid is $14.82. Any new short order must be placed as a limit at $14.83 or higher. The trader cannot add to the short at market for the rest of today and all of tomorrow, even if the stock continues to fall.

Scenario 3 — Threshold list decision: That evening, the trader checks the NYSE threshold list. SPXU has been listed for 8 consecutive settlement days. Under Rule 204’s stricter close-out provisions for threshold securities, the clearing broker has limited flexibility to defer a FTD. Knowing a forced buy-in could occur by day 10, the trader closes the position on day 9 at a planned exit rather than risk a market-open buy-in at an adverse price.

How JournalPlus Helps with Compliance

Short selling compliance requires tracking more data than a standard long trade. JournalPlus lets traders log the borrow rate at entry as a trade note, which makes it straightforward to calculate cumulative borrow cost against unrealized P&L — a calculation that often determines whether a short is still worth holding.

The platform’s timestamped trade log provides a verifiable record of each entry and exit, which matters when a broker force-closes a position under Rule 204. Having a clear record of when you entered, what price you paid, and when the position was closed (voluntarily or otherwise) is essential if you need to dispute a close-out or reconcile your tax basis.

For traders running multiple short positions, exporting a full trade history from JournalPlus allows a quick audit of which positions involved HTB names, how long they were held, and what borrow costs accumulated — useful both for reviewing strategy performance and for tax reporting under day trading tax rules.

Disclaimer

This content is for educational purposes only and does not constitute legal, tax, or financial advice. Tax laws and trading regulations change frequently. Regulation SHO rules and related SEC guidance are subject to amendment. Consult a qualified securities attorney or compliance professional for advice specific to your situation.

Frequently Asked Questions

What is the locate requirement under Regulation SHO?

Rule 203 requires a broker to locate shares available to borrow before accepting a short sell order. Easy-To-Borrow stocks are pre-approved on daily ETB lists; Hard-To-Borrow stocks need a manual locate and carry daily borrow fees quoted as an annualized percentage.

What is a fail-to-deliver and how does Rule 204 handle it?

A fail-to-deliver occurs when a short seller cannot deliver shares on the settlement date. Rule 204 requires the clearing broker to close out the FTD position by the open of business on T+2 after the settlement date of the fail — approximately T+4 from trade date for equities — typically at market price at the open.

How do I check if a stock is on the Threshold Securities List?

NYSE, NASDAQ, and CBOE publish the Threshold Securities List each trading day by 6 PM ET on their websites. A stock appears when aggregate FTDs equal or exceed 0.5% of total shares outstanding for five or more consecutive settlement days.

When does Rule 201 activate and what does it prevent?

Rule 201 activates when a stock falls 10% or more from its prior day closing price. For the rest of that session and the entire next trading day, short sales must be priced above the current national best bid, blocking market short orders and preventing short sellers from adding to positions during a sharp decline.

How is Rule 201 different from the original uptick rule?

The original uptick rule, in effect before 2007, required each individual short sale to execute at a price strictly above the immediately preceding trade — a tick-by-tick test applied continuously. Rule 201, added in June 2010, is a price-test triggered only by a 10% daily drop; once triggered, it applies for two full sessions and requires short orders to be priced above the national best bid rather than the last trade price.