RE: It is now time to move OCDO to the NASDAQ6 Jun 2024 11:35
@hubster1 - Broadly, your shares are usually treated as 'fungible' and you could then ask your broker to start the 'cross border' process (or similar), which is arranged through the custodian that holds the shares on their behalf. For a company this size it is likely that that process will automatically be put in place by custodians and your broker should then contact you to notify that you have the choice to either sell in the UK before delisting, or ask them to complete the cross border for you and then you can trade them on the other exchange (assuming your broker offers a US trading facility, maybe not all do). There may be a fee for this process.
But specific details will be issued weeks/months in advance by any company considering that, plenty of time to go through it all if it was to happen.
The actual transfer of the shares should not have any immediate tax implications (that I know of), but it then depends on if you choose to sell them before/after and where you hold the shares (so possible CGT). Also, if they then pay future dividends (yeah, I know, don't go there) in USD it will have different tax implications at that time. But tax is variable to personal circumstances so I'm not going to comment further on that.