Volume Spread Analysis
Volume Spread Analysis (VSA) is a market analysis methodology, popularised by Tom Williams, that studies the relationship between the price spread of a bar, the closing position within that spread, and the accompanying volume to distinguish professional accumulation or distribution from retail-driven price action.
Tom Williams, a professional trader who worked alongside Richard Wyckoff's associates, adapted Wyckoff's original principles into a more systematic methodology he called Volume Spread Analysis. The core premise is that the 'smart money' — large institutions, market makers, and professional operators — inevitably leaves clues in the price and volume record because of their size: they cannot enter or exit positions without moving prices and generating detectable volume signatures.
The three inputs for any VSA bar are the spread (the distance between the high and low), the volume (the total activity during that bar), and the close position (whether price closed near the top, middle, or bottom of the spread). The interaction of these three elements produces a vocabulary of individual bar types that classify the bar's likely meaning.
No Demand is a key VSA signal: a narrow-spread bar closing in the middle or lower half on volume below the previous two bars, occurring in an uptrend. The narrow spread indicates professionals are not supporting the move, and the low volume confirms that buying interest is absent. This is often the first warning of an impending decline.
No Supply mirrors this for downtrends: a narrow-spread bar closing in the upper portion on low volume. If no new supply is entering the market as price pulls back, professionals may be allowing a brief retracement before resuming accumulation.
Stopping Volume is the VSA equivalent of Wyckoff's Selling Climax: a wide-spread bar closing in the middle or upper portion on very high volume, after a prolonged decline. The high volume indicates professional absorption of retail panic selling. The failure of price to close near the low despite enormous volume confirms that the bar's spread represented 'effort without result' from the sellers' perspective.
Upthrusts and Pseudo Upthrusts are single-bar false breakouts above resistance on high volume that close back below the level, signalling professional distribution into retail breakout buying.
VSA platforms such as TradeGuider have been marketed in India, but most practitioners implement VSA principles manually using standard charting software with volume overlays. The methodology is best suited to NSE equity cash market stocks rather than derivatives, where the volume data represents actual share transactions rather than contract rollovers.