Yes, in principle. The regulation defines the authorised representative for extended producer responsibility as any natural or legal person established in the Member State concerned and appointed by written mandate (Articles 3 and 45): nothing requires an external provider. A group company established locally can therefore take on the role, if it accepts the obligations that come with it (registration, declarations, fees, contact point for the authorities) and has the administrative means to do so. Also check the arrangements in the country concerned, which national law may specify. For countries where the group has no entity, a provider covering several countries completes the set-up under a single contract.
Read the source article: French EPR authorised representative: who must appoint one