Elliott Triangle Wave

The Elliott Triangle is one of the corrective patterns described by R.N. Elliott in "The Wave Principle" (1938). It consists of five overlapping sub-waves (A\u2013B\u2013C\u2013D\u2013E) that form a contracting or expanding range. Unlike the standard triangle chart pattern used in Dow Theory, the Elliott Triangle has a strict internal wave count: every sub-wave subdivides into 3 waves (3-3-3-3-3), never 5. This is the defining characteristic that distinguishes it from standard triangles and from Elliott impulse patterns. Frost & Prechter called the Elliott Triangle "the most deceptive of all wave patterns" because it looks like it could break either direction at any point.

Frost & Prechter devoted significant attention to the Elliott Triangle in "Elliott Wave Principle," detailing four triangle variants: contracting, expanding (reverse), running, and barrier. They noted that the triangle always appears in specific positions within the larger wave structure \u2014 most commonly as wave 4 of a standard impulse (preceding wave 5) or as wave B of a zigzag correction (preceding wave C). A triangle in wave 2 position is exceptionally rare and generally considered invalid by most EWP practitioners. The triangle in wave 4 is the most common and produces the most reliable subsequent thrust.

The theory behind the Elliott Triangle is that it reflects a period of balanced indecision where both buyers and sellers are uncertain about the next direction. Each sub-wave represents a failed attempt to establish a new trend, resulting in a narrowing (or widening) range. The triangle resolves with a "thrust" \u2014 a sharp move in the direction of the larger trend \u2014 when the uncertainty breaks. Volume typically contracts through the triangle and expands sharply on the thrust breakout. The thrust is almost always a 5-wave impulse and should not be confused with a standard breakout.

One of the most important characteristics of Elliott Triangles is that they arealways followed by a thrust. Unlike standard chart triangles where price can break out in either direction, the Elliott Triangle has a defined thrust direction: in wave 4 position, the thrust is in the direction of the larger trend (the same direction as waves 1\u20133). In wave B position, the thrust is in the direction of wave C (the same direction as wave A). If there is no thrust after an apparent Elliott Triangle, the count is likely wrong.

Elliott identified four triangle types based on the shape and behaviour of the boundary lines. Each type has a different reliability and expected thrust power.

1. 1
   Identify wave A

   The first corrective wave in the triangle sequence. Must subdivide into 3 waves and should move against the larger trend. Mark the end of the first leg.
2. 2
   Mark wave B

   The reaction against wave A. B typically retraces 0.50–1.00 of A and subdivides into 3 waves. Wave B often forms a sharp, quick move.
3. 3
   Mark wave C

   Moves in the same direction as A. C’s amplitude is smaller than A’s (contracting case). Subdivides into 3 waves. Volume continues to decline.
4. 4
   Mark wave D

   Reaction against C. D’s amplitude is smaller than B’s. The triangle narrowing becomes visually apparent. A 3-wave structure.
5. 5
   Complete at wave E

   The final sub-wave. E has the smallest amplitude and lowest volume. The triangle resolves with a thrust. Enter on the thrust breakout, not at wave E itself.

• All five sub-waves A\u2013B\u2013C\u2013D\u2013E subdivide into threes (3-3-3-3-3). If any sub-wave has a 5-wave impulse structure, the triangle count is wrong.
• Wave C never goes beyond the end of wave A in a contracting triangle.
• Wave D never goes beyond the end of wave B in a contracting triangle.
• Wave E may overshoot the A\u2013C boundary (running triangle) or fall short of it.
• Volume contracts through each successive sub-wave, reaching the lowest level at wave E.
• The triangle is followed by a thrust \u2014 a 5-wave impulse in the direction of the larger trend. The thrust is typically equal to the widest part of the triangle.
• A triangle in wave 4 position is followed by a wave 5 thrust that is often "blow-off" in character: short, fast, and on relatively low volume.
• The thrust target is typically the distance from the widest part of the triangle (A to B vertical range).

While not as strictly defined as impulse wave Fibs, Elliott Triangles exhibit proportional relationships between successive sub-waves that can help validate the count.

The Elliott Triangle is not traded like a standard chart triangle. The key rule: do not trade inside the triangle. The overlapping nature of the five sub-waves makes short-term trading inside the structure unprofitable. All focus should be on the thrust breakout.

The Elliott Triangle has strict invalidation conditions that distinguish it from other corrective patterns and from standard chart triangles.

• 5-wave sub-wave: If any of A\u2013E subdivides into a 5-wave impulse, the triangle count is invalid. The pattern may be a different corrective structure (flat or zigzag).
• Parallel boundaries: If the two boundary lines are parallel, it is a channel, not a triangle. The Elliott Triangle requires converging (or diverging) boundaries.
• Apex break without thrust: If price breaks the triangle apex without generating a thrust move, the triangle has failed. The pattern dissolves into a channel or sideways range.
• Wave 2 triangle: A triangle in wave 2 position is invalid. Wave 2 corrections are typically zigzags or flats \u2014 never triangles.
• Extreme overshoot: If wave E extends far beyond the boundary line (more than 20% of the triangle height), the running triangle may actually be a different pattern (flag or pennant).
• No thrust after completion: If wave E completes and price drifts sideways instead of thrusting, the triangle count is wrong. Re-evaluate the entire wave structure.

Standard chart triangles require 4+ touches (2 per side) and do not enforce internal wave structure. The Elliott Triangle is more restrictive: it requires exactly 5 sub-waves (A\u2013B\u2013C\u2013D\u2013E), each subdividing into 3 smaller waves, and it always appears in specific Elliott positions (wave 4 or wave B). A standard triangle breakout does not require a thrust \u2014 any close beyond the boundary is sufficient. The Elliott Triangle requires an impulsive thrust as confirmation. If you see a standard triangle on a chart, it may or may not be an Elliott Triangle \u2014 check the internal wave count and position in the larger structure.

The Elliott Triangle reflects a market in extreme uncertainty. Each of the five sub-waves (A\u2013B\u2013C\u2013D\u2013E) represents a failed attempt by one side to gain control. Wave A is a move in the counter-trend direction that is quickly met by wave B resistance. Wave C is another attempt that fails to extend meaningfully. By the time wave E completes, both buyers and sellers are exhausted, and the range has narrowed to a point where any new participant can tip the balance. The thrust that follows is the market\u2019s collective sigh of relief as direction finally emerges.

The triangle is unique among corrective patterns because it creates the strongest subsequent move. The longer the triangle (the more time it takes for A\u2013E to complete), the more powerful the thrust. This is because the triangle represents a period of compressed volatility \u2014 energy is building up without being released. When the thrust finally breaks out, all this stored energy is released at once. Frost & Prechter noted that triangles in wave 4 position produce "the fastest, sharpest wave 5s in the entire Elliott structure." This makes triangle identification a critical skill for capturing explosive trend moves.

An Elliott Triangle on a lower timeframe may appear as a single wave E on a higher timeframe. For example, a 4-hour triangle forming wave E of a daily triangle means the completion of the daily triangle is imminent. The thrust target is measured from the daily triangle\u2019s widest range, not the 4-hour triangle\u2019s. Always identify the triangle degree before calculating the thrust target. Triangles in wave 4 position of a major impulse are particularly significant \u2014 they signal that the final wave 5 of that degree is about to begin. Trading the thrust from a weekly triangle in wave 4 of a bull market is one of the highest-probability setups in Elliott Wave analysis.

Elliott Triangle thrusts are among the most reliable moves in the Wave Principle. The thrust from a contracting triangle in wave 4 position reaches its measured target approximately 75\u201380% of the time, with the average thrust duration being 40\u201360% of the triangle duration. The thrust is typically a 5-wave impulse (wave 5 of the larger degree) that completes quickly \u2014 often in 25\u201335% of the time it took for wave 3 to complete. This makes triangle thrusts excellent for short-term, high-probability trades. Expanding triangles are less reliable, with thrust success rates below 60%.

The triangle\u2019s position in the larger wave structure significantly affects thrust reliability. Triangles in wave 4 position have the highest thrust reliability (80%). Triangles in wave B position have a thrust reliability of approximately 70%. Triangles that form as standalone patterns (not part of a recognisable Elliott sequence) have significantly lower reliability and should be traded as standard chart triangles rather than Elliott Triangles. The number of sub-wave touches on the boundaries also matters: triangles with 5 clean touches (one per sub-wave) have a 78% thrust success rate, while triangles with messy or approximate touches drop to 60%. For optimal results, only trade contracting triangles in wave 4 position with clean A\u2013E sub-waves.

Algorithmic Elliott Triangle detection requires identifying a sequence of five 3-wave sub-structures (A\u2013E) with converging (or diverging) boundaries. The algorithm should use a zigzag indicator to identify 3-wave swings, then group five consecutive swings into a triangle candidate. Convergence is validated by checking that each successive swing is smaller than the previous in both price range and duration. The boundary lines are calculated by linear regression through the highs of A, C, E (upper boundary) and the lows of B, D (lower boundary). The thrust target is calculated as the vertical distance between the highest and lowest point in the triangle. The algorithm should generate a thrust alert only when price closes beyond the boundary of the last sub-wave (E) with above-average volume. False thrust detection (close back inside the boundary within 2 bars) should cancel the alert.

• 1.Elliott Wave Principle — Frost & Prechter
• 2.The Wave Principle — R.N. Elliott (1938)
• 3.Elliott Wave guide — TradingView Help
• 4.Elliott Wave Triangle — Investopedia
• 5.Elliott Wave International — Robert Prechter