Methodology: How We Track ETF Flows
Traditional "fund flow" data tracking creations and redemptions of ETF shares is often delayed or locked behind expensive institutional paywalls. At Westmount Research, our ETF Fund Flows Tracker uses a data-driven volume and price-action methodology to proxy net money flow for the largest ETFs on the market.
The Money Flow Calculation
We analyze the daily trading volume combined with the Typical Price (Average of High, Low, and Close) over the specified periods (1-month and 3-months). When the daily Typical Price is higher than the previous day's, the volume is classified as an inflow (buying pressure). Conversely, a lower Typical Price classifies the volume as an outflow (selling pressure).
This proxy—similar to Chaikin Money Flow (CMF)—allows investors to spot institutional accumulation or distribution in real-time, providing a transparent look at where big money is moving across US Equity, International, Fixed Income, and Commodity ETFs.
Frequently Asked Questions
What are ETF fund flows?
ETF fund flows refer to the net amount of money moving into or out of an Exchange Traded Fund over a specific period. Positive flows (inflows) indicate investors are buying and creating new shares, while negative flows (outflows) indicate selling and redemption of shares.
How do ETF inflows and outflows affect the stock market?
Massive ETF inflows typically signal bullish sentiment in a specific sector or index, driving up the prices of the underlying stocks held by the ETF as the fund managers must purchase them. Conversely, large outflows can indicate bearish sentiment and create downward pressure on those stocks.
Which ETFs have the biggest inflows in 2026?
The biggest inflows in 2026 fluctuate weekly, but typically target broad-market funds like SPY, VOO, and IVV during bull markets, or rotate into fixed-income ETFs like BND and AGG during times of economic uncertainty. You can track the top daily and monthly inflows in our tracker above.
How to track where institutional money is moving?
Institutional money is best tracked by monitoring block trades, dark pool activity, and net ETF fund flows. By observing which asset classes (like US Equities vs. Commodities) are experiencing sustained inflows over 3-month periods, investors can identify institutional rotation.
Why is ETF flow data important for investors?
ETF flow data acts as a contrarian or trend-following indicator. Sustained inflows confirm an established trend, while extreme inflows or outflows can sometimes indicate a crowded trade or an impending market reversal, helping investors position their portfolios accordingly.