Nice stock but has the same problems as any Swiss share
High non-fully deductible withholding tax like ADR....
Don't know how much deductible withholding tax is a problem for non-Germans but the Swiss withholding tax is higher than the US/French and if you can't even deduct it or only partially deduct it... you have to make up for this "loss" first.
But it doesn't look like an ADR - where did you buy them - IBKR?