US: NYSE & NASDAQ trading psychology

US markets run 9:30am to 4:00pm ET, with an extended pre-market and after-hours session either side. Volume and volatility are heavily front-loaded into the first 30 to 60 minutes after the open, and again in the final hour before the close.

What tends to move it: Earnings season (roughly the third week of January, April, July, and October) drives outsized single-stock moves, and Fed rate decisions move the broad market regardless of what's in your portfolio.

1. Chasing the opening range. The first 5 to 15 minutes often overstate the day's real direction, since it's compressed reaction to overnight and pre-market news. Entering on that first move, before the range settles, is a common way to buy a top or short a bottom.
2. Trading through earnings without a plan. A stock can gap 10-20% overnight on earnings. Holding a position into an earnings date without a predefined plan for both outcomes turns a trading decision into a coin flip.
3. Overreacting to Fed days. FOMC announcement days produce sharp, often two-sided moves in the first hour after the release as the market reprices, then frequently reverses. The first move is not always the real move.
4. Ignoring the last-hour reversal. US markets often see institutional rebalancing flows in the final 30-60 minutes that can reverse the day's earlier trend. A position that looked great at 2pm ET can look very different by the close.
5. Sizing the same in low-volume summer months. August and the week between Christmas and New Year's see meaningfully lower volume, which means the same position size can produce larger, choppier price swings than the same trade would in a higher-volume month.

• Wait for the first 15-30 minutes to pass before treating any move as confirmed direction.
• Know your earnings calendar for anything you hold, and decide your plan before the date, not after the gap.
• On FOMC days, consider reducing size or sitting out the first hour entirely if your plan doesn't specifically trade the event.
• Review your last hour of trades separately from your morning trades, the discipline pattern is often different.

Confirm market hours and policy-event timing with the exchange and central bank, then apply your own written risk plan. This guide is educational, not financial advice. NYSE market hours and calendars · Federal Reserve meeting calendars · PnL App editorial policy.