I realize all ETF's are probably on different schedules depending on who's managing them. My question is: is there a way to learn the schedule for when they modify their holdings?
Let's take Invesco's QQQ for example. Is there a simple (ish) way to find out when they have modified their underlying holdings? Or is there at least a way to see how the holdings have changed historically?
the most helpful thing I've found, and it may be my answer is:
the adviser adjusts the securities from time to time to conform to periodic changes in the identity and/or relative weights of index securities.