Only companies based in the EU or EEA can submit chemical registrations to REACH. If you are based outside this region, you need to set up a legal entity within the EU to manage REACH registrations. The mechanism used is the Only Representative registrant or OR.
An OR is a natural person or legal entity established physically within the EEA who is appointed by a manufacturer, formulator or article producer, outside the EEA, to take on all responsibilities for complying with the legal requirements under REACH.