Not all stocks can be held in ISAs. For a stock to become ISA-eligible, it must meet HMRC’s qualifying requirements. It’s possible that the stock you’re looking for no longer meets them. A common example of ineligible investments is OTC-delisted stocks that were moved to an unrecognised by HMRC exchange. Some ADR (American Depository Receipts) stocks can also be ISA-ineligible.
