The moment when a stock's price moves above a defined resistance level — typically the top of a base pattern — on volume significantly above average, signalling the start of a new price advance.
“You must have the courage to buy at exactly the right time — which is when you are most afraid.”
— Mark Minervini
Deeper Explanation
A breakout is the pivot point in the momentum investment cycle — the precise moment when the balance of supply and demand shifts decisively in favour of buyers. After a period of base formation, where the stock has been contained within a price range, the breakout occurs when price moves above the top of that range on volume that is significantly above the 50-day average — typically 40–50% or more above normal. The volume requirement is the critical distinguishing feature. A price move above resistance on low or average volume is suspect — it may reflect a lack of sellers rather than aggressive institutional buying, and is likely to reverse. A breakout on high volume confirms that large buyers — institutions with meaningful capital — are actively accumulating shares and willing to pay the breakout price. This institutional demand creates the sustained buying pressure that drives the subsequent advance. The optimal buy point on a breakout is within 5% of the base top — close enough to the pivot that the stop-loss (placed just below the base) limits risk to an acceptable level, but not so late that the risk-reward has deteriorated. Chasing a breakout that has already moved 10–15% above its pivot dramatically worsens the risk-reward ratio: the potential upside is the same, but the stop-loss is now much further away. False breakouts — moves above resistance that quickly reverse back into the base — are part of the landscape. They are managed by the stop-loss, not avoided by waiting. Waiting for confirmation beyond the breakout typically means missing the best entry and paying a worse price. The solution is correct position sizing: small enough that a false breakout triggers the stop-loss at an acceptable loss, large enough that a true breakout produces meaningful portfolio gains.
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