One other thing to bear in mind when looking at investing in US stocks in your ISA is ADR’s.
Firstly, what are they? An American Depositary Receipt is a way for non-US companies to allow trading in the US market, they are owned and issued by US banks.
Can they be held in an ISA? This all depends on the underlying company and where it is traded, it is not based on where the ADR is traded (eg NYSE, NASDAQ). If the underlying company is traded on a recognised exchange then you can invest in your ISA, but if it isn’t then you can’t.
So, if you buy an ADR for a Canadian company which is listed on the Toronto stock exchange, that can go into your ISA. But, if you buy an ADR for an Indian company, where there isn’t a recognised exchange, this can only go into a GIA.