Reg SHO Rule 204 Mandatory Close-Out Borrow Squeeze
The Formal Definition
A mandatory regulatory close-out requirement enforced by the SEC under Regulation SHO Rule 204 that legally compels a clearing broker-dealer to buy-in or borrow shares on the open market to close out a failure-to-deliver position before market open on T+3 (for short sales) or T+5 (for long sales), triggering forced short squeezes.
$$\text{Mandatory Close-Out Deadline: Buy-In Execution Required before 09:30 ET on } T+3 \text{ (Shorts) or } T+5 \text{ (Longs)}$$
Cole Barrett's Reality Check
The Unvarnished Bottom Line"Reg SHO Rule 204 is the legal catalyst behind modern meme-stock short squeezes. If a broker fails to deliver shares on settlement day, the SEC starts a non-negotiable countdown clock. By 9:30 AM on day three, the broker is legally required to buy the shares on the open market at whatever price is on the screen. Hedge funds know this, buy up all the available shares, and force the broker to buy at peak prices."
Interactive Simulator: Test the Math
Real-World Example: Scenario Breakdown
Examining the real numbers for: A clearing broker carrying a 50,000-share failure-to-deliver position in a heavily shorted retail equity reaching its Rule 204 mandatory close-out deadline
| Execution Metric | Rule 204 Squeeze Arbitrageur | Defaulting Short Seller |
|---|---|---|
| Fee / Rate | $0.0035/share DMA rate | $0 stock commission |
| Spread / Buffer | Monitored SEC fail-to-deliver data; anticipated mandatory Rule 204 buy-ins hitting the market at 9:30 AM on T+3 | Failed to deliver borrowed shares; failed to borrow replacement shares before the T+3 deadline |
| Execution / Status | Bought shares pre-market; resting sell limit orders were swept at $45.00 by the broker's mandatory buy-in algorithm | Broker's automated clearing engine executed a mandatory market-order buy-in for all 50,000 shares at the 9:30 AM open bell |
| Total Cost / Result | Monetized mandatory regulatory clearing buy-in flow | Forced into an emergency open-market buy-in at peak squeeze prices |
How Brokers Weaponize This Term
Monitor the SEC's bi-weekly 'Fails-to-Deliver' (FTD) data reports. If a stock exhibits persistent multi-million-share FTD spikes that cross into the SEC Regulation SHO threshold list, mandatory Rule 204 close-outs will force automated morning buy-ins, creating explosive upside volatility.
Broker Evaluation Matrix
Cole Approves
Interactive Brokers: Operates strict automated locate engines and fully compliant buy-in processing under SEC Regulation SHO Rule 204, eliminating naked short settlement failures.
Read Audit →Cole Flags / Avoids
Offshore Short Desks: Permits un-located naked short selling, frequently trapping clients in forced open-market buy-in liquidations at peak prices.
View Trap Details →Frequently Asked Questions
What is the penalty for failing to close out an FTD under Rule 204?
If a broker fails to execute a mandatory close-out on time, the broker is legally prohibited from executing any further short sales in that security for itself or any client without a pre-borrow agreement.
What is the SEC Regulation SHO Threshold List?
It is a list published daily by exchanges showing securities that have aggregate fail-to-deliver positions for five consecutive settlement days of at least 10,000 shares and equal to at least 0.5% of the issuer's total shares outstanding.