RE: GDXJ sold a chunk3 Feb 2021 09:27
As TMT said JohnZ there are 2 scenarios:
1. GDXJ AUM drops due to investor redemptions. To fund those they will have to liquidate holdings, that will be done proportionately to keep the weightings as is.
2. The value of the holdings fluctuate daily which changes the % weighting of overall AUM. That isn't constantly adjusted to 1.1%. So when GGP dropped to 24p, GDXJ weren't buying, that review only happens at the quarterly rebalance. i.e. Say it was 1.1% at the Dec rebalance, GGP SP halved and GDXJ AUM remained constant. That % weighting would be at 0.55%, they wouldn't be buying back up to 1.1% every time it dropped.