It’s unlikely to be a very common case, and it isn’t comparable to a bankruptcy.
Options:
- Start by contacting your book-entry account (ao-tili) provider and ask for advice.
Or
- Contact Pareto, which apparently handled the delisting; however, you will likely still need to contact your book-entry account provider afterward.
Alternatively…
- Adjust the balance to zero on your next tax return and hope the tax authorities don’t notice. If they do, just play dumb and claim you thought the value had gone to zero. Most of the time, the tax authorities don’t have the time to spend on cases under €10k.
Once you somehow manage to sell them or similar – there will certainly be costs involved, but it’s worth it, because you definitely shouldn’t leave a four-figure loss unutilized.