National Bank Holdings – NBHC: Involvement in a Previously Undisclosed SEC Investigation Now Appears Over – Documents Received - Removed from Watch List. If loans are central to your business, and a regulator is investigating your charge-off practices, it stands to reason this would be considered material and most certainly of interest to investors. Apparently, National Bank Holdings didn’t see it that way. Full details on a sizable SEC probe NBHC kept from investors appears in today’s report.