TL;DRThe Volume-Weighted Average Price resets each session and tracks the average price weighted by volume. Institutional traders use it as a benchmark for fair value. Price above VWAP favors longs. Price below favors shorts.
VWAP stands for Volume-Weighted Average Price. It calculates the average price of all trades during a session, weighted by the volume at each price. Unlike a simple moving average that weighs each price equally, VWAP gives more weight to prices where heavy volume occurred.
VWAP resets at the beginning of each RTH session. It starts at the opening price and evolves throughout the day as more trades occur. Early in the session, VWAP moves significantly with each trade. By afternoon, it becomes more stable because so much volume has been incorporated.
Large institutional traders use VWAP as a benchmark for execution quality. If a fund needs to buy 10,000 ES contracts during the day, they measure their average fill against VWAP. Filling below VWAP means they got a good deal.
This creates a self-fulfilling dynamic. Because institutions are benchmarked against VWAP, they tend to buy below it and sell above it. This makes VWAP act as support when price is above it (institutions buying on dips to VWAP) and resistance when price is below it (institutions selling on rallies to VWAP).
The simplest application: price above VWAP favors long trades, price below VWAP favors short trades. When price is above VWAP, the average buyer for the day is profitable. When price is below, the average buyer is at a loss.
VWAP pullback entries are popular. In an uptrending day where price stays above VWAP, buying pullbacks to VWAP offers a low-risk entry with the institutional flow.
VWAP standard deviation bands (typically +/- 1 and 2 standard deviations) act as stretched targets. Price reaching the +2 deviation band is statistically extended and may revert toward VWAP.
End-of-day VWAP convergence is a common pattern. Price that spent the day above or below VWAP often returns to it in the final hour as institutions square up positions.
VWAP pullback entry
ES is in a strong uptrend today. VWAP is at 5,205 and price has been above it all session. At 11 AM, ES dips to 5,206, one point above VWAP.
You buy at 5,207 with a stop at 5,200 (below VWAP). Target is the session high at 5,225. The logic: institutional buyers benchmarked against VWAP will provide support near this level. If VWAP breaks, your thesis is invalidated.
End-of-day VWAP convergence
ES spent the morning above VWAP at 5,210. VWAP is at 5,202. At 3 PM, price starts drifting lower toward 5,204.
End-of-day VWAP convergence is underway. Institutions are closing positions and the market is gravitating back toward the day's average price. Afternoon trades toward VWAP are common in the final hour.
Using VWAP as a buy/sell signal in isolation
VWAP is a reference level, not a trigger. Combine it with price action, volume, and other levels. Buying every touch of VWAP on a downtrending day is a losing strategy.
Not anchoring VWAP to the correct session start
VWAP should reset at RTH open for most applications. Using a 24-hour VWAP (including overnight) gives a different and usually less useful level for day trading.
Expecting VWAP to work on low-volume days
VWAP is most reliable when volume is high because the weighted average is based on more data. On thin-volume days (holidays, pre-holidays), VWAP is less meaningful.