Some patterns are complicated. The double top and double bottom are not. A stock hits a key level twice and can't get through it. That's the whole story. Simple to spot, clear to trade, and consistent enough that traders have been using these patterns for generations.

They're not exciting. But they work.

What the Double Top Looks Like

A double top forms after an uptrend. Price rallies to a high, pulls back to a support level, rallies again to roughly the same high, and then fails to push through. Two peaks, same approximate level. The stock couldn't break resistance on the second attempt, and that tells you something.

The pullback between the two peaks creates a trough. That low is the neckline. When price eventually breaks below the neckline, the double top is confirmed and the bearish reversal is underway.

What the Double Bottom Looks Like

The mirror image. Price falls to a low, bounces to a resistance level, falls again to roughly the same low, and holds. Two troughs, same approximate level. Buyers defended that zone twice. The bounce between the two troughs creates a peak, and that's the neckline. A close above the neckline confirms the bullish reversal.

Double Top (Bearish)
Forms after: An uptrend
Two: Peaks at the same resistance
Neckline: The low between the two peaks
Trigger: Close below the neckline
Target: Pattern height projected downward
Double Bottom (Bullish)
Forms after: A downtrend
Two: Troughs at the same support
Neckline: The high between the two troughs
Trigger: Close above the neckline
Target: Pattern height projected upward

Why Two Tests Matter

One test of a level could be coincidence. Plenty of stocks hit a resistance level, pull back, and then blast right through it on the next try. Two tests at the same level carry more weight.

When the stock returns to that resistance for a second time and fails again, it's confirming that sellers are genuinely defending that zone. They were there the first time. They showed up again. The second rejection is the market telling you the level means something.

Time matters here. A double top where the two peaks are only two days apart is less significant than one where the peaks are separated by weeks or months. More time between peaks means more market participants have had a chance to interact with that level.

Volume Tells You If It's Real

Volume gives you a useful read on whether the pattern is likely to follow through.

For a double top: the first peak usually has higher volume than the second. If the second rally to the resistance level comes on noticeably lighter volume, that confirms buyers are losing conviction. They're not showing up the same way they did the first time. That's a good sign the second rejection will stick.

For a double bottom: the second trough should have lower volume than the first. Sellers are running out of energy. When the stock bounces off that second low on higher volume, that's the confirmation you want before looking for an entry.

The Trade Setup

Double Top Trade Setup
Entry A confirmed close below the neckline (the trough between the two peaks).
Stop Loss Just above the resistance level where the two peaks formed.
Target Measure the height from the neckline to the peaks, then project that distance below the neckline.
Double Bottom Trade Setup
Entry A confirmed close above the neckline (the peak between the two troughs).
Stop Loss Just below the support level where the two troughs formed.
Target Measure the height from the troughs to the neckline, then project that distance above the neckline.

The One Mistake That Kills These Trades

Entering before the neckline breaks.

You see the second peak form on the double top and you're convinced it's headed lower. So you short early. And then price meanders sideways for three weeks before breaking, or worse, it rallies and breaks through resistance entirely. The pattern wasn't a double top at all.

Wait for the close. The neckline break is the confirmation. Until it happens, you're speculating on a pattern that might not complete. After it happens, you have structure, a defined stop, and a measured target. That's a real trade.

How Close Do the Two Peaks Need to Be?

They don't need to be exact. A difference of 1-2% between the two peaks is perfectly acceptable. What matters is that both attempts at the level were rejected clearly. If the second peak is significantly higher or lower than the first, the pattern loses its symmetry and becomes harder to rely on.

Also worth knowing: the neckline doesn't have to be perfectly flat. A slightly sloping neckline is fine. What you're looking for is a clear inflection point where price reversed twice from roughly the same level.

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