As far as I know, Duquesne Family Office LLC Holdings does not manage outside money. You can find his holdings on different web sites updated quarterly. I thought only funds managing outside money are required to file 13F and thus announce their holdings?
"The SEC's Form 13F is required for institutional investment managers who have at least $100 million in assets under management. The $100 million limit applies to all accounts over which the investment manager has authority."
If I am not mistaken, this rule applies only to REGULATED investment managers, but not to "family offices". But IF the family office takes outside monies, it must report as well.