diff --git a/partner_company_group/models/res_partner.py b/partner_company_group/models/res_partner.py
index 6995b0048..e332057c4 100644
--- a/partner_company_group/models/res_partner.py
+++ b/partner_company_group/models/res_partner.py
@@ -10,6 +10,11 @@ class Contact(models.Model):
     company_group_id = fields.Many2one(
         "res.partner", "Company group", domain=[("is_company", "=", True)]
     )
+    company_group_member_ids = fields.One2many(
+        comodel_name="res.partner",
+        inverse_name="company_group_id",
+        string="Company group members",
+    )
 
     def _commercial_fields(self):
         return super()._commercial_fields() + ["company_group_id"]