If I realize capital gains from my investments (seven figures) and can prove the source of funds while passing Enhanced Due Diligence with one institution, would a second institution (a broker) need to redo all the compliance checks if I move the funds to them? Do these institutions communicate with each other? Also, if I take delivery of share certificates (because I don’t trust the broker) and sell them through a third institution (another broker, still in my name), would I need to go through Due Diligence checks again?"