Anchored VWAP: Volume-Weighted Price from an Event

Key Takeaways

• Anchored VWAP starts the running sum at a user-selected bar instead of the session open.
• The chosen anchor is usually an event such as an earnings release, swing high, or breakout.
• Price above the anchored line favors buyers since that event; below favors sellers.
• The most common mistake is anchoring to a random bar instead of a meaningful event.

What It Is

Anchored VWAP is a variant of the volume-weighted average price calculation. The math is identical, but you decide where it begins. Standard intraday VWAP begins at the open. An anchored VWAP can start from a specific high, low, gap, earnings bar, or any other point of interest.

Brian Shannon, CMT and founder of Alphatrends, made the tool widely used. He treats anchored VWAP as a record of the average price paid by every participant since a chosen event, and uses it to judge whether buyers or sellers are in control since that moment.

The Intuition

If a stock breaks out on heavy volume, the breakout bar is a clear event. Every share traded since then has a cost basis. Anchored VWAP from that bar gives you, in one line, the volume-weighted average of all those costs.

While price stays above the anchored line, the average buyer since the breakout is sitting in a winning position. While price stays below, the average buyer is underwater. That framing turns anchored VWAP into a behavioral level: support if the line holds, resistance if it caps rallies.

How It Works

The formula is the standard VWAP, with the cumulative sums starting at the anchor bar instead of the daily open.

Typical Price = (High + Low + Close) / 3
TPV = Typical Price x Volume
Anchored VWAP_t = Sum(TPV from anchor to t) / Sum(Volume from anchor to t)

The choice of anchor is the key analytical decision. Common anchor points:

• Major swing high or swing low, to track the cost basis of the move that followed.
• Earnings release bar, to measure post-earnings sentiment.
• Index high or low at a regime change such as a Fed pivot.
• Gap day, to see whether gap participants are winning or losing.
• IPO listing day, to gauge whether the IPO is above or below its average cost since listing.

Standard interpretation:

• Price above anchored VWAP: average participant since the anchor is profitable. Buyers in control.
• Price below anchored VWAP: average participant since the anchor is underwater. Sellers in control.
• Reclaim of anchored VWAP from below: often treated as a regime shift; the average bear position from the anchor is now losing.

Worked Example

Suppose a stock posts an earnings beat and gaps up from $90 to $100 on huge volume. A trader anchors a VWAP to the open of the earnings bar.

Over the next month the stock rallies to $115, then pulls back. The anchored VWAP, fed by heavy volume around $100 to $105 on the earnings day and lighter volume in the rally, sits at about $104.

If the pullback finds support around $104, the trader interprets that as the average post-earnings buyer defending their cost basis. A long entry near the anchored line, with a stop below it, is the typical Brian Shannon style trade.

If instead the stock breaks below $104 on rising volume, the average post-earnings buyer is now losing money. The same trader would treat that as a sign the earnings move has failed and step out of the long.

A second anchored VWAP from a later swing low would track the cost basis of a different cohort. Stacked anchored VWAPs from multiple events are common on charts maintained by professional swing traders.

Common Mistakes

1. Anchoring to a random bar. The whole power of anchored VWAP comes from the anchor being meaningful. Anchoring to last Tuesday's open produces a line with no narrative behind it.
2. Using it on thin or illiquid names. With low volume the running averages are unstable and the line whipsaws around price. Anchored VWAP works best on liquid stocks where event volume dominates.
3. Treating the line as a hard rule. A break below anchored VWAP is information, not a stop order. Confirm with structure and other tools before exiting.
4. Stacking too many anchored lines. A chart with eight anchored VWAPs becomes noise. Two or three anchors at clearly important events is usually enough.
5. Confusing anchored VWAP with a normal moving average. Anchored VWAP weights by volume and stretches further back the longer you hold the anchor. A 50-day moving average forgets the past at a fixed rate.

Frequently Asked Questions

What is anchored VWAP in simple terms? Anchored VWAP is the volume-weighted average price calculated from a specific bar you choose. It shows the average price paid by every participant since an event like earnings or a swing low.

How does anchored VWAP affect investment decisions? Swing traders anchor a VWAP to a meaningful event and use it as a dynamic support or resistance line. Holding above the line favors longs; breaks below the line warn that the average buyer since the event is now under water.

What is a real-world example of anchored VWAP? After a major index low, an anchored VWAP from that low rises slowly as new volume comes in. Pullbacks during the rally often find support near the anchored line, which represents the average cost basis of all shares traded since the bottom.

How can investors use anchored VWAP effectively? Pick anchors that mark real events, use the line as one input among several, and confirm breaks with volume and structure. Avoid anchoring to bars chosen for visual appeal rather than meaning.

How is anchored VWAP different from standard VWAP? Standard VWAP resets every session and is mainly used intraday as an execution benchmark. Anchored VWAP starts whenever you tell it to and can span days, weeks, or years, which makes it a swing and position tool rather than just an intraday one.

Sources

1. StockCharts ChartSchool. Anchored VWAP. https://chartschool.stockcharts.com/table-of-contents/technical-indicators-and-overlays/technical-overlays/anchored-vwap
2. Alphatrends by Brian Shannon. Master the Anchored VWAP Strategy. https://alphatrends.net/anchored-vwap/
3. Trade Ideas User Guide. Anchored VWAP Add-On. https://www.trade-ideas.com/guide/chapter/33/33Anchored_VWAP_Addon.html
4. TradingSim. Anchored VWAP Strategy for Day Trading. https://www.tradingsim.com/blog/anchored-vwap-strategies

Disclaimer

This article is educational content only and is not financial advice. Nothing here is a recommendation to buy, sell, or hold any security. Consult a licensed advisor before making investment decisions.