Stats › Intraday and market microstructure › Halt timing
17% of US stock halts land in the first fifteen minutes
The opening fifteen minutes runs at roughly 5 times the midday rate and 8 times the closing rate. Source: LULD Plan 2025 annual report, my arithmetic.
US single stocks pause for five minutes when the best bid or offer sits at a price band. In 2025, 1,823 of the year's 10,763 pauses fell in the first fifteen minutes, which is 3.8% of the session. The last twenty five minutes took 363.
1,823Pauses, first 15 minutes
16.9%Share of all pauses
3.8%Share of the session
363Pauses, last 25 minutes
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