GLD (SPDR Gold Shares) is the world's largest gold ETF — a fund you can buy on the stock market that holds real physical gold bars in vaults. When investors buy GLD shares, the fund must go and buy actual gold. When they sell, the fund sells gold.
GLD Holdings tells us how many tonnes of physical gold the fund is holding. When holdings rise, institutional money is flowing into gold. When they fall, investors are leaving.
How does it affect gold?
GLD Holdings rising = more physical gold being bought by the fund = bullish for gold prices.
GLD Holdings falling = gold being sold by the fund = bearish signal.
This is a direct demand indicator — unlike most other indicators that affect gold indirectly, GLD flows ARE actual gold buying and selling in the market.
If GLD holdings are rising and the gold price is also rising, that confirms the move is supported by real demand. If gold rises while GLD falls, be cautious — it may not be sustainable.