Wyckoff Events and Phases Explained
Wyckoff's events (PS, SC, AR, ST, Spring, SOS, SOW, UTAD, LPS, LPSY) and phases (A through E) form the complete vocabulary of market analysis — here is every term defined.
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Wyckoff Events and Phases Explained
The Wyckoff schematics use a specific vocabulary of events and phases. Memorizing these terms is not pedantry — it is the shared language that lets you communicate your reading of the market precisely. This article defines every term used in the accumulation and distribution schematics.
Why events and phases matter
Wyckoff analysis is sequential. Each event confirms the previous one and sets up the next. When you can name where you are in the schematic — "we are in Phase C, awaiting the spring" — you have a precise framework for what to expect next and where your risk lies.
Accumulation events
| Event | Abbreviation | Meaning |
|---|---|---|
| Preliminary Support | PS | First sign of buying after a decline; volume rises, downside narrows |
| Selling Climax | SC | Capitulation bar; wide down, ultra-high volume, close off low |
| Automatic Rally | AR | Sharp bounce after SC; defines the top of the range |
| Secondary Test | ST | Revisit of SC low on reduced volume; confirms supply exhaustion |
| Spring | — | Brief break below range support in Phase C; the final shakeout |
| Test of Spring | TS | Pullback holding above spring low; confirms supply exhaustion |
| Sign of Strength | SOS | Wide up bar on high volume; confirms demand dominance |
| Backup to Edge of Creek | BUEC | Pullback after SOS; the classic low-risk entry |
| Last Point of Support | LPS | Another name for the BUEC; final entry before markup |
Distribution events
| Event | Abbreviation | Meaning |
|---|---|---|
| Preliminary Supply | PSY | First sign of selling after an advance; volume rises, upside narrows |
| Buying Climax | BC | Euphoria bar; wide up, ultra-high volume, close off high |
| Automatic Reaction | AR | Sharp drop after BC; defines the bottom of the range |
| Secondary Test | ST | Revisit of BC high on reduced volume; confirms demand exhaustion |
| Upthrust | UT | Brief break above range resistance |
| Upthrust After Distribution | UTAD | Dramatic UT in Phase C; the final rally trap |
| Test of UTAD | — | Rally holding below UTAD high; confirms demand exhaustion |
| Sign of Weakness | SOW | Wide down bar on high volume; confirms supply dominance |
| Backup to Edge of Creek | BUEC | Rally after SOW; the classic low-risk short entry |
| Last Point of Supply | LPSY | Another name for the BUEC; final entry before markdown |
The five phases
Both schematics divide into five phases, each with a specific function.
Phase A: stopping the prior trend
Phase A's job is to halt the prevailing move. In accumulation, this means ending the markdown via PS → SC → AR → ST. In distribution, this means ending the markup via PSY → BC → AR → ST. Phase A defines the trading range.
What to look for: high-volume climax bars followed by an automatic reaction/rally and a lower-volume secondary test.
Phase B: building the cause
Phase B is the longest phase. Price oscillates within the range as the composite operator accumulates or distributes. Multiple STs may occur. Volume is variable but generally lower than Phase A.
What to look for: developing cause via sideways range; diminishing volume on tests of the range extremes.
Phase C: the test
Phase C contains the signature event — the spring (accumulation) or UTAD (distribution). This is where the composite operator tests whether the opposite side is truly exhausted.
What to look for: brief penetration beyond range support/resistance, then immediate snap-back, often on diminished or absorbing volume.
Phase D: confirmation
Phase D confirms that the spring/UTAD was genuine. A SOS (accumulation) or SOW (distribution) breaks the range structure. Higher lows and higher highs (accumulation) or lower highs and lower lows (distribution) develop within the range.
What to look for: the BUEC entry, which is the lowest-risk point in the entire schematic.
Phase E: breakout
Phase E is the breakout above (accumulation) or below (distribution) the range. The new trend phase — markup or markdown — begins.
What to look for: breakout on strong volume, often with a brief retest of the range edge.
The creek and ice
Two additional terms appear in Wyckoff's writing:
- The Creek: the irregular resistance line at the top of an accumulation range. Crossing the creek (the SOS) marks the start of markup.
- The Ice: the irregular support line at the bottom of a distribution range. Breaking the ice (the SOW) marks the start of markdown.
The BUEC — "Backup to the Edge of the Creek" — is named because the pullback returns to test the creek (now support) before markup continues.
Reading sequence example
A complete accumulation reading might be narrated as:
"After the markdown, we saw PS at $40, then SC at $36 with the AR establishing resistance at $42. ST confirmed low supply. We are now in Phase B, oscillating $36-$42. No spring yet — we are waiting for Phase C. Once the spring forms and is followed by a SOS, the BUEC will be our entry, with a stop below the spring low and a target from the point-and-figure count."
This narrative — events, phases, and a specific trade plan — is what Wyckoff fluency looks like.
Summary
The Wyckoff vocabulary is precise because the analysis is precise. Learn each event and phase, practice narrating the schematic aloud on real charts, and you will develop the fluency to read any market's current state — and the next likely move — with clarity.
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