--- title: "Halt & Volatility Control Explorer" description: "Explore LULD price bands, market-wide circuit breakers, and single-stock halt rules interactively. See which volatility control applies to any scenario." canonical: https://www.getswoopr.com/markets/execution/sessions-auctions-halts-and-volatility-controls/halt-and-volatility-control-explorer/ source: "Swoopr Investment: https://www.getswoopr.com" --- ## Direct Answer > The halt and volatility control explorer looks up how Limit Up-Limit Down (LULD) price bands, market-wide circuit breakers, and single-stock halts apply to a given scenario. It calculates the applicable price band, identifies the relevant circuit breaker threshold, and explains what happens to open orders during each halt type. # Halt & Volatility Control Explorer Explore how LULD price bands, market-wide circuit breakers, and single-stock halts work. Calculate price bands, look up circuit breaker thresholds, and understand what happens to open orders during any halt type. **Educational tool only.** All figures are based on publicly documented regulatory rules (SEC, FINRA, SRO plan). Thresholds can change; verify against current exchange and SRO publications before making trading decisions. This tool does not constitute investment advice. ## Volatility Control Explorer Choose a module below. Each tab is independent, use them in any order. LULD Price Bands Circuit Breakers Single-Stock Halt Types Order Fate During Halts The Limit Up-Limit Down (LULD) plan sets a price band around each NMS stock's reference price. Trades outside the band are prevented; if the national best bid sits at the upper band or the national best offer sits at the lower band (a limit state) and is not executed or cancelled within 15 seconds, a 5-minute trading pause is triggered. Reference price (last sale or 5-min avg) Use the prevailing transaction price or average Tier / index membership Select tier Tier 1, S&P 500, Russell 1000, eligible unleveraged ETPs Tier 2, All other NMS stocks (not Tier 1) Time of day 9:30 AM to 3:35 PM (standard bands) 3:35 PM to 4:00 PM (last 25 minutes, doubled for most stocks) Calculate price bands LULD Price Band for entered scenario Upper band (Limit Up) N/A Reference price N/A Lower band (Limit Down) N/A Band percentage: N/A | Pause trigger: 15 seconds outside band | Halt duration: 5 minutes ### LULD Band percentage reference | Price range | Tier 1 (core session) | Tier 2 (core session) | Last 25 minutes (3:35 PM to 4:00 PM) | | --- | --- | --- | --- | | > $3.00 | 5% | 10% | Tier 1 10%; Tier 2 10% (not doubled) | | $0.75, $3.00 | 20% | 20% | Doubled (40% / 40%) | | < $0.75 | Lesser of $0.15 or 75% | Lesser of $0.15 or 75% | Doubled | Bands are calculated from the average price of eligible trades over the preceding five minutes; the first reference price of the day is the primary listing exchange's opening price. Unleveraged ETPs, including inverse ETPs, with more than $2,000,000 of average daily notional volume are generally Tier 1. Leveraged ETPs are Tier 2, and their bands are the Tier 2 percentage multiplied by the leverage ratio. Market-wide circuit breakers (Rule 80B) halt all U.S. equity trading when the S&P 500 drops a defined percentage from the prior day's close. Three levels exist; Level 3 halts trading for the rest of the day regardless of when it triggers. ### Scenario lookup S&P 500 decline from prior close (%) Time of day (ET) Select time Before 9:35 AM 9:35 AM, 3:25 PM After 3:25 PM Look up circuit breaker ### All three levels at a glance | Level | S&P 500 decline | Before 3:25 PM, halt duration | At or after 3:25 PM | | --- | --- | --- | --- | | Level 1 | 7% | 15 minutes, then reopens | No halt, trading continues | | Level 2 | 13% | 15 minutes, then reopens | No halt, trading continues | | Level 3 | 20% | Halt for remainder of day | Halt for remainder of day | Each level can only be triggered once per day. A Level 1 halt that has already been triggered does not halt again even if the market falls to the Level 1 threshold a second time, trading continues until Level 2 is breached. Thresholds are set using prior-day close and published by the exchanges each morning before the open. Single-stock halts fall into three broad families: regulatory (exchange or regulator-initiated), news-pending (Nasdaq/NYSE), and volatility-driven (LULD pause or exchange-specific). Click a halt type to see its trigger, duration, and what happens to open orders. What happens to your open orders when a halt is triggered depends on the halt type, your order type, and where the order was resting. Use this lookup to understand the likely outcome for common scenarios. Halt type Select halt type LULD 5-minute trading pause Market-wide circuit breaker (Level 1 or 2) Market-wide circuit breaker (Level 3, day halt) News-pending halt (T1 / T12) Regulatory halt (H10 / H11) Order type Select order type Limit order, Good for Day (GFD) Limit order, Good Till Cancelled (GTC) Market order Stop or stop-limit order Market-on-Close (MOC) order Order state when halt hits Select state Working / open at exchange Sent to broker, not yet acknowledged Queued at price limit, near LULD band Look up order fate Likely outcome Key principle: Halts freeze the matching engine but do not automatically cancel orders. GFD orders remain open during the halt and are eligible to execute when trading resumes. GTC orders persist beyond the session. Market orders and stop orders may execute at unexpected prices on resumption, particularly after a LULD pause, where a re-opening auction often sets the first trade price. Always verify with your specific broker, as broker-level handling can differ from exchange defaults. ## Frequently Asked Questions - An LULD (Limit Up-Limit Down) pause is a 5-minute halt declared by the primary listing exchange when the national best bid stays at the upper price band, or the national best offer stays at the lower price band, for 15 seconds without being executed or cancelled. It is mechanical, no human decision-maker initiates it. The pause ends automatically after 5 minutes and the stock reopens via an auction. A regulatory halt is initiated by a regulator (SEC, FINRA) or a listing exchange. It can last from minutes to days and is typically tied to a specific event: material news pending, a trading investigation, or failure to meet listing standards. Regulatory halts require an explicit lift before the stock can trade again. - For Level 1 and Level 2 circuit breakers, no, they do not halt trading if triggered at or after 3:25 PM ET. The intent is to avoid disrupting the closing auction process when the trading day is nearly over. Level 3 (a 20% decline in the S&P 500) is the exception: it halts trading for the remainder of the day regardless of when it is triggered. This has never been triggered since the modern rule took effect in 2013, the steepest single-day declines since then remained below 13%. - If your market order reached the exchange before the pause began and was not yet filled, it typically remains open in the order book during the 5-minute pause. When trading resumes, LULD pauses reopen through an auction process. Your market order would execute at the auction-clearing price, which may be meaningfully different from the pre-halt reference price, particularly if the fundamental cause of the movement persists. If your market order was submitted to your broker but had not yet been routed to the exchange when the halt was declared. The broker may queue it or route it when trading resumes. Check your broker's specific handling policy; some brokers convert unrouted market orders during halts to limit orders to prevent extreme execution prices. - The LULD plan applies during the regular trading session (9:30 AM, 4:00 PM ET) only. Extended-hours trading (pre-market and after-hours) on ECNs is not covered by LULD. This means stocks can trade at prices outside what would be their LULD band during those sessions, extremely wide bid-ask spreads and thin liquidity make extended-hours prices much more volatile in practice. Market-wide circuit breakers similarly apply only during regular session hours. - For stocks priced below $0.75, the LULD band uses whichever is smaller: $0.15 or 75% of the reference price. This prevents the percentage-based formula from producing absurdly wide bands on penny stocks while still capping extreme moves. For stocks priced between $0.75 and $3.00, a flat 20% band applies regardless of tier. The 5% (Tier 1) or 10% (Tier 2) percentage bands only kick in for stocks priced above $3.00. During the last 25 minutes of the session (3:35 PM to 4:00 PM ET, or the last 25 minutes before an early scheduled close), bands are doubled for all Tier 1 stocks and for Tier 2 stocks priced at or below $3.00; Tier 2 stocks above $3.00 keep their 10% band. - No, when a stock is halted, all U.S. exchanges and ATS venues that disseminate quotes and facilitate trading in that NMS security are required to honor the halt. The halt is disseminated through the Consolidated Tape and the SIP (Securities Information Processor), and all trading venues must stop accepting executable orders in the halted security until the halt is lifted. However, broker-to-broker negotiated transactions (OTC trades not going through lit exchanges) may technically occur in some circumstances, but these are rare, non-standard, and may face regulatory scrutiny. For all practical purposes, a halt means no trading anywhere in the U.S. until it is lifted. - A straddle state occurs when the national best bid is below the lower LULD band, or the national best offer is above the upper band, while the stock is not in a limit state. The LULD plan does not make a straddle state trigger a pause automatically; it allows the primary listing exchange to declare a trading pause when a stock in a straddle state is trading in a way that departs from normal trading characteristics, under the exchange's own policies. For traders, the straddle state is a warning sign: liquidity has dried up to the point that one side of the quote sits outside the permitted range. Prices on resumption may gap significantly once normal quoting resumes. - Where can the official parameters behind these mechanisms be read? ▼ The price-band framework operates under a national market system plan filed with and approved by the regulator, and the plan document sets out the tiers, band percentages, the widening near the close and the pause procedure. Market-wide circuit breakers operate under exchange rules approved the same way. Those filings are the authoritative text; explanations elsewhere, including this page, summarize them and can lag amendments. - How should an open position be reviewed for exposure to these mechanisms? ▼ The questions worth answering before the fact are whether the security is in a tier with wider or narrower bands, whether the intended exit relies on a resting order that a pause would leave unfilled, and how much of the position could be exited within a single session under normal conditions. Deciding the response while trading is halted is the situation these mechanisms are most likely to create. ## References - [SEC Investor.gov: Stock Market Circuit Breakers](https://www.investor.gov/introduction-investing/investing-basics/glossary/stock-market-circuit-breakers) - [Nasdaq: Trading Halts](https://www.nasdaqtrader.com/Trader.aspx?id=TradeHalts) - [SEC: Division of Trading and Markets](https://www.sec.gov/about/divisions-offices/division-trading-markets) ## Related lessons - [Limit Up-Limit Down (LULD) Trading Pauses Explained](https://www.getswoopr.com/markets/execution/sessions-auctions-halts-and-volatility-controls/limit-up-limit-down-trading-pauses-explained/) - [Market-Wide Circuit Breakers Explained](https://www.getswoopr.com/markets/execution/sessions-auctions-halts-and-volatility-controls/market-wide-circuit-breakers-explained/) - [Single-Stock Halts: News, Volatility, and Regulatory Pauses](https://www.getswoopr.com/markets/execution/sessions-auctions-halts-and-volatility-controls/single-stock-halts-news-volatility-and-regulatory-pauses/) - [Opening Auctions: How the First Price Is Formed](https://www.getswoopr.com/markets/execution/sessions-auctions-halts-and-volatility-controls/opening-auctions-how-the-first-price-is-formed/) - [Common Extended-Hours and Halt-Related Mistakes](https://www.getswoopr.com/markets/execution/sessions-auctions-halts-and-volatility-controls/common-extended-hours-and-halt-related-mistakes/) - [Stop, Stop-Limit, and Triggered Orders in Real Markets](https://www.getswoopr.com/markets/execution/orders-routing-and-fill-quality/stop-stop-limit-and-triggered-orders-in-real-markets/) - [Auction Imbalances and Indicative Prices](https://www.getswoopr.com/markets/execution/sessions-auctions-halts-and-volatility-controls/auction-imbalances-and-indicative-prices/) ## Related Reading - [Sessions, Auctions, Halts & Volatility Controls](https://www.getswoopr.com/markets/execution/sessions-auctions-halts-and-volatility-controls/) the section this guide belongs to - [Auction Imbalances and Indicative Prices](https://www.getswoopr.com/markets/execution/sessions-auctions-halts-and-volatility-controls/auction-imbalances-and-indicative-prices/) a companion guide in this cluster - [Closing Auctions and Market-on-Close Orders](https://www.getswoopr.com/markets/execution/sessions-auctions-halts-and-volatility-controls/closing-auctions-and-market-on-close-orders/) a companion guide in this cluster - [Common Extended-Hours and Halt-Related Mistakes](https://www.getswoopr.com/markets/execution/sessions-auctions-halts-and-volatility-controls/common-extended-hours-and-halt-related-mistakes/) a companion guide in this cluster - [Holiday, Half-Day, and Special Trading Sessions](https://www.getswoopr.com/markets/execution/sessions-auctions-halts-and-volatility-controls/holiday-half-day-and-special-trading-sessions/) a companion guide in this cluster - [Limit Up-Limit Down (LULD) Trading Pauses Explained](https://www.getswoopr.com/markets/execution/sessions-auctions-halts-and-volatility-controls/limit-up-limit-down-trading-pauses-explained/) a companion guide in this cluster - [Market Session & Holiday Calendar](https://www.getswoopr.com/markets/execution/sessions-auctions-halts-and-volatility-controls/market-session-and-holiday-calendar/) a companion guide in this cluster - [Market-Wide Circuit Breakers Explained](https://www.getswoopr.com/markets/execution/sessions-auctions-halts-and-volatility-controls/market-wide-circuit-breakers-explained/) a companion guide in this cluster - [Opening Auctions: How the First Price Is Formed](https://www.getswoopr.com/markets/execution/sessions-auctions-halts-and-volatility-controls/opening-auctions-how-the-first-price-is-formed/) a companion guide in this cluster - [Opening & Closing Auction Simulator](https://www.getswoopr.com/markets/execution/sessions-auctions-halts-and-volatility-controls/opening-closing-auction-simulator/) a companion guide in this cluster