T6Halt — Extraordinary Market Activity
T6 covers market mechanics rather than company news. The exchange halts trading when it determines that extraordinary activity — a systems problem, misuse of a trading system, or activity likely to produce an unfair or disorderly market — is distorting price discovery in the security.
What triggers it
- A malfunction or misuse of a quotation, order entry, or trade reporting system that materially affects the market in the security.
- Activity the exchange judges likely to cause a disorderly or unfair market if trading continues.
How long it lasts
Varies with the underlying problem. It runs until the exchange determines the distorting condition has been resolved.
How it resumes
Trading resumes once the exchange is satisfied the market can operate normally, typically through the standard reopening process.
What it means for a day trader
T6 often accompanies erroneous prints. Expect the possibility of trade breaks — fills you believe you have may be cancelled after the fact.
Treat T6 as an infrastructure event, not a catalyst. It carries no directional information about the company.
Related halt codes
Track T6 halts as they happen
Halt Strategy monitors live NASDAQ and NYSE halts, replays the setup around each event, and backtests outcomes segmented by halt code — so T6 events are never averaged in with everything else.
Primary sources
Halt Strategy is research software, not investment advice, and does not execute trades. Halt procedures are set by the exchanges and regulators and can change; confirm current rules against the primary sources before acting on them. Read the full disclaimer and editorial policy.