The Counterparty burn address aside, here's the 2nd address with the most "whole coins" (UTXOs worth exactly 100,000,000 sats).

19GP1D3BPe8K8uvbTaqxLzXPyBFj9GhHrL

Looks like they acquired most of their bitcoin back in 2013, spend some in 2017, then split the rest up into whole coins and have been HODLing all 342 of them ever since.