Physically backed gold ETFs buy or sell real metal as investors create or redeem shares, so holdings changes are direct spot demand. Flows are published with a lag of at least one day and historically follow price rather than lead it, making them a confirmation tool for trend durability rather than a timing signal.
Physically backed gold ETFs buy and sell allocated bullion when shares are created or redeemed, making holdings changes a direct measure of Western investment demand for metal.
Flows are reported with a lag and historically follow the gold price rather than lead it, because they reflect allocation committee decisions implemented over weeks.
For traders the value is confirmation: rising tonnage alongside rising price signals a durable allocation-led trend, while price highs against falling tonnage signal a futures-led move that can unwind sharply.