Volume

Volume tells the story behind price movement. Here is how professionals interpret it:

Breakout confirmation: A price breakout above resistance is only valid if accompanied by above-average volume (1.5x+ the 20-day average). Low-volume breakouts frequently fail because there is insufficient buying conviction to sustain the move.

Volume divergence: When price makes new highs but volume is declining, it signals weakening buyer conviction. This bearish divergence often precedes reversals. Conversely, rising volume on pullbacks within an uptrend signals that selling pressure is increasing.

Climax volume: An extremely high-volume day (3x+ average) after an extended move often marks a climax — either a selling climax (washout bottom) or a buying climax (blow-off top). Climax days signal exhaustion of the prevailing trend.

Volume dry-up: Very low volume during a consolidation (0.3-0.5x average) is actually bullish — it means sellers are exhausted. When volume then surges on a breakout from that consolidation, the move is often powerful because compressed supply meets new demand.

Institutional fingerprints: Institutions cannot hide their activity. When you see unusual volume (2-3x normal) without a clear news catalyst, it often indicates institutional accumulation (buying) or distribution (selling) ahead of a major move.

Raw volume bars are useful, but volume-derived indicators extract additional signal:

On Balance Volume (OBV): Developed by Joe Granville, OBV is a cumulative indicator that adds volume on up days and subtracts volume on down days. It measures whether volume is flowing into or out of a stock over time. When OBV is rising while price is flat or lagging, it signals accumulation — buying is occurring quietly. When OBV diverges from price (price makes new highs but OBV does not), it warns of distribution before the price drops. OBV is one of the most reliable leading indicators for identifying institutional positioning.

Relative Volume (RVOL): RVOL compares the current period's volume to the average volume for the same time period. An RVOL of 2.5 at 10 AM means the stock has traded 2.5x its typical 10 AM volume. High RVOL is a key day-trading filter — stocks with RVOL above 2.0 have enough liquidity and interest for intraday momentum strategies. Tradewink uses RVOL as a mandatory confirmation filter for every breakout signal.

Accumulation/Distribution (A/D) Line: The A/D line weights volume by where the price closes within its daily range. If a stock closes in the upper half of its range on high volume, the A/D line rises (accumulation). If it closes in the lower half, the A/D line falls (distribution). Unlike OBV, A/D accounts for intraday price action, not just the direction of the close. Divergences between the A/D line and price often precede major trend reversals.

Volume Weighted Average Price (VWAP): The average price weighted by volume throughout the trading day. Institutional orders are benchmarked against VWAP — buying below VWAP is considered good execution, selling above VWAP is good. When price is above VWAP, the intraday trend is bullish; below VWAP, it is bearish. VWAP acts as both a trend indicator and a dynamic support/resistance level throughout the day.

Volume behaves differently depending on the overall market environment, and misreading volume in the wrong context leads to bad trades:

Bull market volume patterns: In a healthy uptrend, volume should expand on up days and contract on down days (pullbacks). This pattern — high-volume advances, low-volume pullbacks — confirms that institutional buyers are driving the trend and selling pressure is limited. When pullback volume starts matching or exceeding advance volume, the uptrend is weakening.

Bear market volume patterns: In a downtrend, volume expands on down days and contracts on bounces. High-volume selloffs on bad news, followed by low-volume dead-cat bounces that quickly fail, are the hallmark of a true bear market. The flip pattern — massive volume on a bounce after a prolonged decline — often signals a capitulation bottom (exhaustion of sellers).

Range-bound markets: In sideways markets, volume at the extremes of the range is the critical signal. High volume as price approaches support (with price holding) indicates buyers defending the level. High volume as price approaches resistance (with price rejecting) indicates sellers defending the level. A volume breakout from the range — much higher than any volume seen during the range — often signals the direction of the next sustained move.

Pre-market and after-hours volume: Extended-hours volume is typically 10-20% of regular session volume and dominated by institutional traders responding to news events. High pre-market volume on a stock with a catalyst (earnings beat, analyst upgrade, M&A news) predicts a strong gap and sustained intraday volume. However, pre-market volume for stocks without catalysts is often noise.