@DaveF1006 The way I understand it, the company in the UK manages the shareholder registry themselves - Carta was just used to conveniently reflect the number of shares / options owned.
I exercised before they started using Carta (but also before the FMV of my share crossed 8938 reporting threshold), and now they use Shareworks which is a Canadian company that's also present in the US (I believe), but the company confirmed that they still (also?) maintain shareholder registry internally.
Oh, additionally, I read in TurboTax that a "financial account" could mean "any equity in a foreign financial institution". It so happens that the foreign private company that issued my shares is also a financial institution, albeit not in business of managing equity. I wonder if that provision still makes it a financial account from IRS/FinCEN standpoint?
