Alternative Uptick Rule (SEC Rule 201)
The Formal Definition
A US regulatory restriction triggered when a stock drops 10% or more from its previous day's closing price in a single session, prohibiting short selling for the remainder of that day and the following day unless the order is executed at a price above the current National Best Bid.
Trigger Condition: Intraday Low ≤ Previous Close × 0.90 → Short Sale Execution Restricted to > Current National Best Bid
Cole Barrett's Reality Check
The Unvarnished Bottom Line"Rule 201 is the exchange circuit breaker that stops predatory short-selling cascades. When panic sets in and a stock drops 10%, shorts can no longer smash market bids to drive the price down; they must wait passively in line on the offer, letting buyers establish support."
Interactive Simulator: Test the Math
Real-World Example: Scenario Breakdown
Examining the real numbers for: Stock crashing from $100 close down to $89 intraday (-11% drop, triggering Rule 201)
| Execution Metric | Aggressive Short Seller (Pre-Rule 201) | Regulated Short Seller (Under Rule 201 Circuit Breaker) |
|---|---|---|
| Fee / Rate | $0.00 | $0.00 |
| Spread / Buffer | Submitted market sell order hitting bids freely | Current NBBO: $89.00 Bid / $89.02 Ask |
| Execution / Status | Executed instantly down into the bid stack | Order rejected unless entered above $89.00 |
| Total Cost / Result | Unrestricted downward price pressure | Short selling allowed only on upward price ticks |
How Brokers Weaponize This Term
Retail brokers rarely notify active traders when Rule 201 is tripped on an equity, leading to confused retail traders submitting short market orders that sit unfilled while high-frequency internalizers capture the resting inventory.
Broker Evaluation Matrix
Cole Approves
Interactive Brokers: Trader Workstation (TWS) displays real-time Rule 201 Short Sale Restriction (SSR) warning badges on quote monitors.
Read Audit →Cole Flags / Avoids
Basic Mobile Apps: Silently rejects or leaves short orders open without displaying the active SEC Rule 201 SSR tag.
View Trap Details →Frequently Asked Questions
How long does the Rule 201 short sale restriction last?
It remains active for the remainder of the trading day on which it was triggered, plus the entire subsequent trading session.
Does Rule 201 apply to ETFs and options?
It applies directly to equity and ETF share shorting, but options trading (such as buying puts) is exempt from the restriction.