Track the Push: Uptick Rule & Volume Spikes
Model short sale circuit breakers (SSR) under SEC Rule 201, buyer vs. seller tick volume pressure, and relative volume (RVOL) breakout acceleration.
Intraday Tick Parameters
Restriction & Momentum Status
When RVOL exceeds 3x and Uptick ratio stays above 60%, bid absorption prevents adverse cascading, giving swing breakouts higher odds of holding above the pivot.
Need Hard-to-Borrow Locates Under SSR?
Execute short orders compliantly when Rule 201 is active. Access real-time electronic locates, sub-penny ask pricing, and direct routing.
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How SEC Rule 201 (Alternative Uptick Rule) Operates
10% Circuit Breaker Trigger
If a covered equity declines by 10% or more from its prior closing price at any point during normal trading hours, Rule 201 triggers immediately across all national market centers.
Duration: Rest of Day + Next Day
Once tripped, the restriction remains in effect for the remainder of the trading day and the entirety of the following trading day, preventing coordinated short raids from exacerbating market panic.
National Best Bid Restriction
When SSR is active, market participants can only execute short sales at a price strictly above the current National Best Bid (NBB). Short orders cannot cross the spread to take liquidity at or below the bid.
Unrestricted Short Raids vs. SEC Rule 201 Circuit Breakers
How the Alternative Uptick Rule stabilizes order books against predatory liquidity extraction.
| Market Dynamic | Unrestricted Market (Pre-Rule 201) | SEC Rule 201 Regime (uptick.dev) | Microstructure Impact |
|---|---|---|---|
| Short Aggression | Can relentlessly cross bid spread | ✓ Must rest order strictly > National Best Bid | Eliminates artificial downward cascades |
| Execution Queue | Front-runs passive long limit orders | Passive Ask Queueing Required | Protects legitimate long investor liquidity |
| Short Squeeze Dynamics | Shorts easily cover and re-short lower | Severe Asymmetric Cover Pressure | Violent mean-reversion bounces on bid replenishment |
| Regulatory Scope | Exchange specific or discretionary | Universal Across All National ATSs & SIPs | Applies remainder of day + full next trading session |
Short Sale Regulation & Momentum Dynamics
Answers to Rule 201 circuit breakers, borrow locates, and relative volume telemetry.
The 10% decline is measured against the covered equity's official consolidated closing price on the primary listing exchange (such as Nasdaq or NYSE) from the previous regular trading session. Pre-market price action does not immediately trip SSR, but if the equity opens down ≥10.0% at 9:30 AM EST, the restriction activates instantly.
Yes. Contrary to popular misconception, Rule 201 does not halt short selling entirely. Instead, it restricts short executions to prices strictly higher than the current National Best Bid (NBB). Traders must place limit orders on the ask and wait for incoming buyers to lift their offers.
Relative Volume compares cumulative intraday volume against the security's 20-day average for that exact minute of the session. An RVOL multiple greater than 2.5x indicates substantial institutional capital participation, making technical breakout levels significantly more reliable.
Under SEC Regulation SHO Rule 203(b)(1), broker-dealers must borrow or confirm reasonable grounds to believe the security can be borrowed prior to executing a short sale. Direct market access (DMA) brokers provide automated electronic locate desks allowing traders to secure borrow rights instantaneously for a fee.