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Trading Halt

OVERVIEW

A trading halt is an enforced pause in the trading of a specific security on its listing exchange — and on every other US venue, since Regulation NMS requires all exchanges to honor a primary-listing halt. During a halt, no orders execute; existing orders rest in the book but cannot match. Halts exist to give the market time to absorb material information, throttle disorderly price movement, or allow regulators to investigate compliance concerns. They are not delistings — the security remains tradable; trading is simply paused.

Tapeboard surfaces real-time halt status, reason codes, and LULD band proximity directly in the market terminal so traders can act before a halt is triggered.

HOW TRADING HALTS ARE CATEGORIZED

US exchanges use a standardized halt code system. The most common types:

LULD (Limit Up/Limit Down) — 5-minute volatility halt.

Triggered when a stock's price exits a moving band around its reference price. The band width depends on tier and time of day:

Tier Securities Band Width (Regular Hours)
Tier 1 S&P 500, Russell 1000, select ETPs ±5%
Tier 2 All others above $3 ±10%
Sub-$3 Stocks priced under $3 ±20%

Note

All LULD bands double during the first 15 minutes and last 25 minutes of the regular session. Tapeboard highlights band proximity with a visual indicator when price is within 1% of the downside or upside limit.

When the National Best Bid (for downside) or Best Offer (for upside) sits outside the band for 15 consecutive seconds, the security enters a 5-minute halt followed by a re-opening auction.

T1 (News Pending) — voluntary issuer halt.

A company requests a halt to disseminate material news (earnings, M&A, FDA decision, guidance change). Typical duration: 30 minutes to 2 hours.

M (Volatility Pause) — market-wide circuit breaker.

Triggered by SPX declines of 7% (Level 1), 13% (Level 2) → 15-minute halts, or 20% (Level 3) → close for the day.

Market-Wide Circuit Breakers (Level M)

Triggered by SPX percentage declines from the prior close:

  • Level 1 — 7% decline → 15-minute halt
  • Level 2 — 13% decline → 15-minute halt
  • Level 3 — 20% decline → Market closes for the remainder of the day

T12 / H10 (Regulatory) — SEC or exchange concern.

Can last 10 trading days under SEC authority, longer if extended.

WORKED EXAMPLE

GME on January 28, 2021, during the short squeeze peak:

Time (ET) Event
09:30 Opens at $265 after closing $193.60 the prior session
09:32 LULD halt (up) as price prints $483
09:37 Resumes via auction at $467
10:14 LULD halt (down) at $112 after gap-fill
Throughout session Resumption auctions continue through the session

The stock was halted nine times intraday under LULD rules. Each 5-minute halt produced a resumption auction that opened with a $20–$40 gap. Stops resting in the order book did not execute during the halts but cleared aggressively at the resumption print, locking in worst-case fills for stops set during the prior trading band.

WHEN TRADERS ACCOUNT FOR HALTS

Active traders use halt awareness for three purposes: (1) risk management — reducing or flattening exposure when LULD bands are tight and price is approaching the edge, (2) catalyst trading — recognizing that biotech and small-cap names frequently halt for news and that resumption prices can gap 20–50% on FDA decisions or earnings, (3) execution timing — avoiding new stop-loss orders directly underneath LULD downside bands, where forced auction fills produce worse prices than the band itself.

Options markets follow underlying halts: when a stock is halted, its listed options are halted too, freezing implied volatility marks at the pre-halt level.

Tip

Use Tapeboard's LULD band overlay to identify when price is approaching a halt threshold. Reducing or flattening exposure before the band is breached avoids forced auction fills.

FEATURES

Tapeboard provides the following halt-aware functionality in the market terminal.

Feature Description
Halt status badge Displays current halt code (LULD, T1, M, T12/H10) inline on the quote row
LULD band overlay Live upper and lower band levels plotted on the price chart
Band proximity alert Visual and optional audio alert when price is within a configurable threshold of either band
Resumption countdown Timer displayed during an active halt showing estimated resumption window
Halt history log Intraday log of all halt events and resumption auction prices for the selected security
Options halt sync Options chain greys out and marks implied volatility as frozen when the underlying is halted

HOW TO USE

Monitor LULD band proximity

  1. Open any quote in the Tapeboard terminal.
  2. Enable the LULD Bands overlay from the chart toolbar.
  3. Set a proximity alert threshold under Alerts → Halt Risk → LULD Band Distance.
  4. When price approaches the band, the quote row highlights in amber; a breach triggers the halt badge.

Respond to an active halt

  1. The security's quote row displays the active halt code and a resumption countdown.
  2. Review the Halt Details panel for reason code, halt time, and reference price.
  3. Pending orders remain in the book. Use Order Manager → Review Resting Orders to cancel or modify before resumption.
  4. At resumption, the terminal displays the auction clearing price before continuous trading resumes.

Review halt history intraday

  1. Select a security and open the Halt Log tab in the detail panel.
  2. The log lists each halt event with timestamp, reason code, halt price, and resumption auction price.
  3. Export the log via Export → CSV for post-session review.

LIMITATIONS AND COMMON MISCONCEPTIONS

Three common misconceptions cause real losses.

Misconception Reality
Stops do not protect during halts A stop-loss order rests in the book unfilled during the halt and may execute at the resumption auction price — frequently many points worse than the stop level
Limit orders may not protect either Re-opening auctions print at a single clearing price; a limit buy at $100 will fill at the auction print if that print is at or below $100, even if the auction prints far below the limit on a downside re-open
Halts are not predictable from price action alone LULD bands are calculable, but news-driven T1 halts arrive without warning and frequently resume with multi-standard-deviation gaps

Note

Trading halt logs are public — Nasdaq Trader and OTC Markets both publish real-time halt feeds with reason codes. Tapeboard ingests these feeds and normalizes reason codes across all exchanges.

Tip

Avoid placing stop-loss orders directly underneath LULD downside bands. Forced auction fills at resumption consistently produce worse prices than the band level itself.

KEYBOARD SHORTCUTS

Shortcut Action
H Toggle halt status badge visibility on quote rows
Shift + L Toggle LULD band overlay on active chart
Alt + H Open halt log for selected security
Alt + A Open halt proximity alert configuration
Esc Dismiss active halt notification banner