Who this entry is for — Readers who want to distinguish the first support in Phase A from a final low or an entry signal.
Definition
Preliminary Support (PS) is the area where, after a prolonged decline, material buying begins to provide noticeable support. In the typical Wyckoff schematic, volume and spread increase: the decline may be approaching its end, but it has not necessarily ended.
PS describes market behavior; it does not identify who bought. “Professional” or “institutional” demand is the tradition's interpretation, not a fact available from the chart alone.
How to identify it
| Element | Reading consistent with PS | What it does not conclude |
|---|---|---|
| Context | A prolonged decline is still active | An ordinary correction is not enough |
| Price | More visible support, often with wider spread | It does not establish the final low |
| Volume | Increase relative to preceding bars | It does not prove buyers' identities |
| Later development | Possible SC, then AR and ST | The sequence is not compulsory |
PS can span several bars or an area rather than one exact print. Its function distinguishes it from the Selling Climax: PS is preliminary; SC represents a possible culmination of selling pressure.
Hypothetical example — After a ten-week decline, spreads and volume expand while buying is able to slow the fall for the first time. The area can be marked as provisional PS. If a later downswing develops climactic features, that may be labeled SC; without follow-through, the PS label remains uncertain.
Phase A sequence
In the complete teaching variant:
- PS — material support appears;
- SC — selling pressure may culminate;
- AR — reduced selling permits a rally that helps define resistance;
- ST — the market returns toward the SC area to test residual supply.
The second of the nine buying tests includes PS, SC, and ST. This does not turn PS into an early signal: when it appears, most of the sequence is not yet observable.
When it may be absent
The sources note that a downtrend can stop without a clear climax. In reaccumulation, which occurs within a larger uptrend, PS, SC, and ST may not be evident because there is no prolonged decline to stop.
The absence of a spring concerns Phase C: a springless schematic can still contain PS in Phase A. The two criteria should not be confused.
Common error — Buying because an area has been labeled PS. The term marks only a possible early change; the decline can continue and the entire reading can be relabeled.
Sources
- StockCharts ChartSchool, The Wyckoff Method: A Tutorial — “Accumulation: Wyckoff Events” and “Phase A”, definition of PS and the PS–SC–AR–ST sequence.
- Wyckoff Analytics, Wyckoff Method, accumulation schematics and nine tests.
- Jim Forte, Anatomy of a Trading Range, MTA Journal, 1994.