UK RIE means an RIE that is not an ROIE. For a list, see the FCA's RIE register.
ROIE means an overseas investment exchange (having neither its head office nor its registered office in the UK) with a recognition order in force in respect of it. For a list, see the FCA's ROIE register.
As an exempt person, an RIE is exempt from the general prohibition under FSMA in respect of any regulated activity which is carried on as part of the exchange’s business as an investment exchange, or which is carried on for the purposes of, or in connection with, the provision of clearing services by the exchange.