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Do shares purchased on FTSE AIM move with company to other markets?
Any shares you buy when a company is listed on one market will remain yours if the company moves to another market. Markets and exchanges like AIM are just venues for dealing in shares - indeed you can deal in those shares anywhere else that will allow you as well as on the AIM. The benefit of being listed in a market is that trade in the shares will be more "liquid" - there's more likely to be people who want to buy and sell them at any given time. The bigger concern would be what happens if the company does badly and drops out of the AIM entirely. You'd still be able to sell your shares to any willing buyer, but finding that buyer might get harder.