diff --git a/lemarche/siaes/migrations/0072_siae_extra_data.py b/lemarche/siaes/migrations/0072_siae_extra_data.py
new file mode 100644
index 000000000..e6d94a021
--- /dev/null
+++ b/lemarche/siaes/migrations/0072_siae_extra_data.py
@@ -0,0 +1,17 @@
+# Generated by Django 4.2.9 on 2024-02-26 15:03
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("siaes", "0071_alter_siae_kind"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="siae",
+            name="extra_data",
+            field=models.JSONField(default=dict, editable=False, verbose_name="Données complémentaires"),
+        ),
+    ]
diff --git a/lemarche/siaes/models.py b/lemarche/siaes/models.py
index d6ea649a1..1c58d72de 100644
--- a/lemarche/siaes/models.py
+++ b/lemarche/siaes/models.py
@@ -853,6 +853,7 @@ class Siae(models.Model):
     source = models.CharField(
         max_length=20, choices=siae_constants.SOURCE_CHOICES, default=siae_constants.SOURCE_STAFF_C4_CREATED
     )
+    extra_data = models.JSONField(verbose_name="Données complémentaires", editable=False, default=dict)
     import_raw_object = models.JSONField(verbose_name="Donnée JSON brute", editable=False, null=True)
 
     created_at = models.DateTimeField(verbose_name="Date de création", default=timezone.now)
@@ -1234,6 +1235,11 @@ def get_absolute_url(self):
     def get_admin_url(self):
         return get_object_admin_url(self)
 
+    def set_brevo_id(self, brevo_company_id, with_save=True):
+        self.extra_data.update({"brevo_company_id": brevo_company_id})
+        if with_save:
+            self.save()
+
     def set_super_badge(self):
         update_fields_list = ["super_badge"]
         siae_super_badge_current_value = self.super_badge