A breakout is when price moves above a resistance level -- a price ceiling the stock has failed to break through multiple times. A breakdown is the opposite. High-volume breakouts are among the highest probability setups in trading.
Previous highs: sellers who bought at the top want to 'get out even.'
Round numbers ($100, $500): psychological anchors -- large options positions cluster here.
Moving averages: MA50 and MA200 act as dynamic resistance in downtrends.
52-week highs: many institutional mandates require stocks at new highs.
Valid breakout signs:
- Price closes above resistance (not just touches and retreats)
- Volume is 1.5x or more the 20-day average on breakout day
- Breakout happens in a healthy market (SPY not in downtrend)
False breakout (fakeout):
- Breaks above resistance on low volume, then closes back below
- Often a trap for retail buyers; institutions sell into the move
Related: Volume Analysis • Moving Averages (MA20, MA50, MA200) • Golden Cross & Death Cross