Sessions, gaps & when liquidity lives
The trading day has a shape — trade with it, not against it.
Volume and volatility are not uniform through the day. The same setup that works at 9:45 fails at 12:30, not because the pattern changed but because the participation did.
The shape of a US session
- The open (9:30–10:30 ET) — heaviest volume, widest ranges. Overnight positioning resolves; trends and reversals for the whole day are often set here. Opportunity and danger in equal measure.
- Midday (11:30–14:00 ET) — liquidity thins, ranges compress, chop dominates. Most overtrading losses are manufactured here, forcing trades in a market that has stopped paying.
- The close (15:00–16:00 ET) — volume returns: institutional rebalancing, index flows, and option hedges unwinding into the bell. Moves get fast again.
Gaps & the overnight
News does not wait for the bell — earnings and macro data land outside regular hours, and price gaps to reprice them at the open. A stop order cannot protect you through a gap: it fills at the new price, not your trigger. Holding positions overnight — especially through earnings — is a deliberate risk decision, not a default.
Schedule the danger
Know the calendar: FOMC days, CPI mornings, and monthly OPEX each have their own character. The easiest risk management there is simply sizing down — or watching.