Section 2 · Market Mechanics
The Opening Bell: 9:30 AM ET
The most volatile, most important minute of the entire trading day.
The first candle sets the tone for the whole day.
At exactly 9:30 AM ET the market opens and all the overnight orders, emotions, and anticipation are unleashed at once. The first 5–15 minutes are the most chaotic — spreads are wide, volume is extreme, and prices move fast. Experienced momentum traders look for stocks making new highs in the first minutes of trading. That early strength often signals a trend that can run for hours.
3 things to know
The NYSE opening bell has rung every trading day since 1903.
More volume trades in the first 30 minutes than any other 30-minute window of the day.
The "opening range" (first 5–15 min high/low) is a key reference point all day.
Key vocabulary — tap each card
Did you know?
The phrase "sell in May and go away" exists because summer months historically have lower volume and less volatility at the open — momentum strategies work best in high-volume market conditions.