What is a T1 Halt? Definition, Mechanism, and Example
A T1 halt is a trading pause requested by a company to disseminate material news, typically lasting 30 minutes to 2 hours while the market absorbs the announcement.
What Is a T1 Halt?
A T1 halt is a trading halt initiated when a company requests a pause in trading of its stock to release material news to the market. The "T1" code means "News Pending" — the issuer has alerted the exchange that a material announcement is forthcoming, and trading is suspended until the news is disseminated and investors have had time to process it.
How T1 Halts Work
1. Request: A company contacts its primary listing exchange (NYSE, Nasdaq, or NYSE American) and requests a halt pending a news release.
2. Halt: The exchange halts trading across all US venues (Regulation NMS requires all exchanges to honor the primary listing halt).
3. News release: The company issues a press release via a newswire (GlobeNewswire, BusinessWire, PR Newswire) or an 8-K filing with the SEC.
4. Dissemination period: The market absorbs the news. The exchange requires a minimum dissemination time — typically 10 minutes, but often 30+ minutes for complex announcements.
5. Resumption: The exchange lifts the halt and the stock re-opens via a re-opening auction, which can produce a significant gap from the pre-halt price.
Typical Duration
T1 halts typically last 30 minutes to 2 hours. Most occur after the close (7:50 PM ET) when companies release earnings or material news outside of regular trading hours. When the news is complex or requires regulatory review (e.g., FDA decisions, M&A terms), the halt can extend for several hours or into the next trading session.
What Triggers a T1 Halt
Common catalysts for T1 halts include:
- Earnings announcements — the most frequent trigger, especially after-hours
- M&A transactions — acquisition, merger, or divestiture announcements
- FDA decisions — drug approvals, clinical trial results, Complete Response Letters
- Guidance changes — updated revenue or earnings outlook
- Executive departures — CEO/CFO changes, especially unexpected ones
- Regulatory actions — SEC investigations, enforcement actions
- Stock offerings — secondary registrations, follow-on pricing
T1 vs. Other Halt Types
- LULD halt — price-driven volatility pause; T1 is news-driven
- T12 — additional information requested by the exchange; T1 is issuer-initiated
- Circuit breaker — market-wide, triggered by index declines; T1 is single-stock
Worked Example
A clinical-stage biotech company halts at 7:50 PM ET:
1. 7:50 PM — Company requests T1 halt pending news
2. 8:01 PM — Press release announces positive Phase 3 trial results
3. 8:15 PM — Exchange lifts halt after the dissemination period
4. 8:15 PM — Re-opening auction prints at $45, up 80% from the $25 close
The re-opening gap reflects the market's instant repricing of the news. Stocks with high short interest and low float can gap even more violently, as short sellers scramble to cover in the auction.
Common Misconceptions
T1 halts are voluntary on the part of the issuer, not the exchange. The company requests the halt; the exchange grants it. You cannot trade during a T1 halt. Orders rest in the book but cannot match until the halt lifts. The re-opening price is not guaranteed to be favorable. A T1 halt does not imply positive news — the halt simply means news is pending, and the market may reprice sharply in either direction.