What is VWAP, and why do institutions care?
VWAP stands for volume-weighted average price. It's the average price a stock has traded at during the session, with each trade weighted by its size. It resets every day at the open.
VWAP = Σ(price × volume) ÷ Σvolume
What it represents
VWAP is the "fair" average price for the day. If price is above VWAP, the average buyer today is in profit and buyers are in control. If price is below it, the average buyer is underwater and sellers have the upper hand.
Why institutions care
A pension fund buying two million shares can't do it in one go without moving the price. So it splits the order up over the day, usually with an algorithm. The question its clients ask is simple: did you get a good price?
VWAP is the yardstick. Buying below VWAP is good execution. Buying above it is slippage. That's why so many execution algorithms literally target VWAP, spreading orders in line with the day's typical volume curve.
Because so much size is benchmarked to it, VWAP becomes self-reinforcing. Large buyers step in near it, which is why it often acts as support or resistance.
How traders use it
- Trend filter. Holding above VWAP and rising: favour longs. Below and falling: favour shorts.
- Pullback entries. In a trend, the first test of VWAP is often where institutions add.
- Bands. Standard-deviation bands around VWAP show when price is stretched and likely to revert.
- Anchored VWAP. Start the calculation from a key event, like earnings or a market low, to see the average cost of everyone who bought since.
Limits
VWAP is a lagging, intraday tool. Late in the day it barely moves, because so much volume is already counted. It works best in liquid names and tells you nothing about whether a business is worth owning. That's still a fundamentals question.
Educational content only, not financial advice. Investing involves risk and you can lose money.