What is VWAP? The volume-weighted average price, and why institutions are measured by it

VWAP (Volume-Weighted Average Price) is the average price at which a stock has traded since the start of the day, with each trade counted according to its size. million shares bought at100 affect the average a thousand times more than a thousand shares bought at110The result is a single number that answers the question: if someone bought today "like everyone else," how much did they pay.

The difference from a regular moving average: Moving Average A moving average averages the closing prices of previous days and ignores volume. VWAP averages all of today's trades and resets every morning. The first tells you about the trend, the second about this particular day. They answer different questions, which is why different people use them.

How it's calculated, and why it starts over every morning

For each time interval (a one-minute candle, for example), a typical price is taken, usually the average of the high, low and close, and multiplied by that candle's volume. The products are summed from the start of the day and divided by the cumulative volume from the start of the day. That's the VWAP at that moment. It moves slowly: in the first hour, every candle changes it, but in the last hour almost nothing moves it, because it's already "weighted down" by all the volume that has accumulated.

The daily reset isn't a limitation but the definition: VWAP is a single trading day tool. A "weekly" VWAP on a daily chart is a different number, with a different definition, and usually not the one people mean.

Why funds are measured against it

A fund that needs to buy two million shares can't send a single order; it would move the price against itself. Instead, it spreads the purchase throughout the day, and execution quality is measured against VWAP: a manager who bought below VWAP performed better than "the average market," while one who bought above it performed worse. Execution algorithms simply called "VWAP" spread out orders so that their average price will be close to it.

This is what makes the line relevant even for non-institutional traders: when the price drops to VWAP in the middle of a day of institutional buying, algorithms that haven't finished buying yet see a "price below today's average" and accelerate. The line becomes support not by magic but because of real orders waiting there. On a day of institutional selling, the same mechanism turns it into resistance.

How it's used in intraday trading

• Side of the line: Price above VWAP = today's buyers are in profit on average, long logic. Price below = sellers are in control. Many day traders simply don't open longs below the line or shorts above it.
• Return to the line as an entry point: In a stock that opened with a gap up and continues to rise, the first pullback to VWAP is a commonly accepted entry, with a stop just below it. The logic: if institutions are buying today, that's where they'll defend.
• Losing the line as an exit signal: A stock that traded all day above VWAP and falls below it in the last hour signals that the morning's buyers are selling at a loss. For a day trader, this is a signal to exit.
• Distance from the line: The farther the price is from VWAP, the more participants are in large profit or loss, and the greater the likelihood of a return to it. This isn't a trading rule on its own, but it explains why chasing a stock that's already 8% above its VWAP often ends in a pullback.

Anchored VWAP: the version suited for swing trading

For a swing trader looking at daily candles, regular VWAP is almost meaningless: it resets every morning. The solution that has spread in recent years is called Anchored VWAP: instead of starting the calculation at the day's open, you start it from an event you choose, and from then on sum up all the daily candles. The most natural anchor is the last quarterly reportthe line answers the question "how much, on average, did everyone who bought the stock pay since the report."

Why this is useful: someone who bought since the report and is at a loss won't rush to buy more, while someone in profit protects their gain. When the price returns to the anchored VWAP from above, it meets buyers who see their average entry price; therefore the line tends to act as support in an uptrend, and as resistance in a downtrend, like a support level built from real volume rather than a single high or low. On the TechAnalyzer chart, you can turn on anchored VWAP from the last report with one click, and this is the only version of VWAP we display, because it's the only one relevant to the swing-trading timeframe.

What VWAP doesn't do

• It doesn't predict direction. It reports on what has already happened, just like any average. Its value is in identifying the places where other participants are likely to act.
• It's weak in low-volume stocks. When one large trade is most of the day's volume, the VWAP is simply its price.
• It's not a substitute for a stop. "I'll sell if it breaks VWAP" is an exit rule, not protection. The line can be 5% Below your entry point without you even noticing.