Go to the ANTS website: https://immatriculation.ants.gouv.fr
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Click "Sell or donate your vehicle" (Vendre ou donner votre véhicule)

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Who did you sell the vehicle to? "C'est une personne" select "Morale"

And then click "Acquéreur/Acheteur étranger sans numéro de SIRET"
Then you can do it without SIRET.
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Fill in all the information requested, specifying that you want to declare the sale to a foreign company that does not have a SIRET.
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Attach the various documents: crossed-out carte grise, proof of address, CERFA, certificate of administrative status, proof of identity.
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Remember to take a picture of the crossed carte grise before pick up.
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When you have done the deregistration of the car, you should have an example of the Accusé d'enregistrement Déclaration de cession, see below.
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Please email us a copy of this document when you receive it.
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