We performed an audit of the stocks we offer to check that they were all permitted in an ISA. Only stocks listed on HMRC recognised exchanges are allowed. In the case of ADRs, although they may trade on a recognised exchange, the underlying share has to as well. Unfortunately we identified a few cases where the underlying equity did not meet the requirements. We have to make sure you don’t inadvertently buy these in an ISA as the repairs are rather time-consuming. What we have done is to prevent any inadmissible shares being visible to ISA accounts, although you can of course trade these in an Invest account.