A symmetrical triangle is a stock coiling tighter and tighter — lower highs and higher lows squeezing toward a point — with neither buyers nor sellers in charge. The break can go either way, and the trade doesn't start until it happens. Here's how to spot one, how to trade both directions, and what our testing shows.
A symmetrical triangle is a pattern where a stock's swings shrink from both sides at once: each high tops out a little lower than the last, and each low bottoms out a little higher. Draw a falling line across the tops and a rising line under the bottoms and they squeeze toward a point, like a coiling spring.
The shape means neither side is winning. Buyers step in a little earlier on every dip, sellers a little earlier on every bounce, and the tug-of-war compresses until one side runs out of patience. The break — up through the falling line or down through the rising one — settles the argument.
Unlike a pennant, a symmetrical triangle doesn't need a sharp run (a “pole”) in front of it, and it usually builds over weeks rather than days. Without that pole pointing the way, the breakout direction is close to a coin flip — which shapes everything about how it's traded.
Checking a chart by hand? You're looking for all four of these:
Trading volume (how many shares change hands) usually shrinks as the triangle tightens, then jumps on the day of the break — a useful tell that the break is real and not just a wobble across a line.
A symmetrical triangle is the purest both-ways pattern, so we show you both sides. When one breaks upward it trades like a bull pennant; downward, like a bear pennant. Below are the live results of our nightly backtest for each direction — every trade simulated with the exact rules this guide teaches.
Treat the numbers as odds over many trades, not a promise about the next one. The edge doesn't come from predicting the coin flip — it comes from small losers, measured winners, and letting the break pick the side.
Historical results of the simulated strategy above, refreshed nightly — not a prediction. How we test →
Our screener re-draws these lines on 500+ stocks every night. Here's what its latest scan flagged as a current symmetrical triangle.
99 fresh symmetrical triangles formed in the last 45 days across the 500+ stocks we scan (825 charts tracked for this pattern in total). Scan updated Jul 2, 2026.
A real symmetrical triangle from the latest scan — detected 2026-07-02 on WAT. Live chart, live lines.
98 more live symmetrical triangle setups — every chart, breakout level, and target.
Because the break can go either way, think of it as two orders waiting on two lines — whichever one the price pushes through first is the trade. And a downward break is useful even if you never trade it: if you own the stock, it's the cue that the coil resolved against you.
Everything below comes from rules we've tested on thousands of historical trades. Tap through the three steps to see each one drawn on the chart.
Set the order at the triangle's boundary line in advance — the falling ceiling for an upward break, the rising floor for a downward one — so the trade starts the moment the price pushes through. If the stock opens the day already past the line (it “gapped” overnight), the fill is that morning's opening price. Don't wait for the big breakout day to finish and enter at its close: across roughly 54,000 backtested pattern trades, entering at the line won just as often but made about 28% more overall than entering at the breakout day's close.
For an upward break, the exit sits just below the last small dip before the breakout (the “swing low”): if the price falls back under it, the break has failed. For a downward break it's the mirror: exit if the price climbs back above the last small bounce before the breakdown (the “swing high”). Either way you choose the exit BEFORE the trade starts, so a failed triangle costs a small, known amount.
Measure the triangle's height at its widest point and project that distance from the breakout point, in the direction of the break — that's the symmetrical triangle pattern target (the “measured move”). A downward break banks its result there. An upward break doesn't sell there: it stays in while the price holds above its average of the last 10 days (the “10-day moving average”) and exits when a day finally closes below it — in our testing, that patience made more than selling at the target.
Set your order at the line in advance — you're in the moment price pushes through, not at the day's much higher close.
Neither — until it breaks. A bullish symmetrical triangle and a bearish symmetrical triangle pattern are the same shape; the only difference is which line gives way. The trend the triangle formed in leans the odds a little (one inside a long rise breaks up a bit more often, and vice versa), but the edge is small.
That's not a weakness — it's the instruction manual. Don't bet on a direction while the price is still inside the lines. The trade starts when one line actually breaks, and from that moment it trades like its directional cousins: an upward break like a bull pennant, a downward break like a bear pennant.
Completed examples — wins and losses in both directions, with real dates and results from our nightly test. Each links to that stock's live chart.
Same family, different tells. What separates them is the pole and which line is doing the work:
A pennant is a symmetrical triangle in miniature — but it only counts right after a sharp run (the “pole”), it forms in days instead of weeks, and the pole gives it a directional lean the triangle doesn't have.
The ceiling is flat — the same price keeps rejecting every push — while the floor rises. That one-sided pressure gives it a bullish lean the symmetrical triangle lacks.
The floor is flat — the same price keeps catching every drop — while the ceiling falls. It leans bearish, usually breaking down through the floor.
Educational content, not investment advice. Backtest statistics are historical results of a simulated strategy, refreshed nightly — they describe the past, not the next trade.