diff --git a/lemarche/crm/management/commands/crm_brevo_sync_companies.py b/lemarche/crm/management/commands/crm_brevo_sync_companies.py
index c8f71c99a..4590066e3 100644
--- a/lemarche/crm/management/commands/crm_brevo_sync_companies.py
+++ b/lemarche/crm/management/commands/crm_brevo_sync_companies.py
@@ -8,7 +8,7 @@
 from lemarche.utils.commands import BaseCommand
 
 
-ten_days_ago = timezone.now() - timedelta(days=10)
+two_weeks_ago = timezone.now() - timedelta(weeks=2)
 
 
 class Command(BaseCommand):
@@ -34,11 +34,29 @@ def handle(self, recently_updated: bool, **options):
         self.stdout.write(f"Sync Siae > Brevo: we have {Siae.objects.count()} siaes")
         # Update only the recently updated siaes
         if recently_updated:
-            siaes_qs = siaes_qs.filter(updated_at__gte=ten_days_ago)
+            siaes_qs = siaes_qs.filter(updated_at__gte=two_weeks_ago)
             self.stdout.write(f"Sync Siae > Brevo: {siaes_qs.count()} recently updated")
 
-        # Step 2: loop on the siaes
+        # Step 2: Add the 90-day limited annotations
+        siaes_qs = siaes_qs.with_tender_stats(since_days=90)
+
+        # Step 3: loop on the siaes
         for index, siae in enumerate(siaes_qs):
+            new_extra_data = {
+                "completion_rate": siae.completion_rate if siae.completion_rate is not None else 0,
+                "tender_received": siae.tender_email_send_count_annotated,
+                "tender_interest": siae.tender_detail_contact_click_count_annotated,
+            }
+
+            # extra_data update if needed
+            if siae.extra_data.get("brevo_company_data") != new_extra_data:
+                siae.extra_data.update(
+                    {
+                        "brevo_company_data": new_extra_data,
+                    }
+                )
+                siae.save(update_fields=["extra_data"])
+
             api_brevo.create_or_update_company(siae)
             if (index % 10) == 0:  # avoid API rate-limiting
                 time.sleep(1)
diff --git a/lemarche/crm/tests.py b/lemarche/crm/tests.py
new file mode 100644
index 000000000..9dc517fcd
--- /dev/null
+++ b/lemarche/crm/tests.py
@@ -0,0 +1,219 @@
+from datetime import timedelta
+from unittest.mock import patch
+
+from django.core.management import call_command
+from django.test import TestCase
+from django.utils import timezone
+
+from lemarche.siaes.factories import SiaeFactory
+from lemarche.siaes.models import Siae
+from lemarche.tenders.factories import TenderFactory
+from lemarche.tenders.models import TenderSiae
+from lemarche.users.factories import UserFactory
+from lemarche.users.models import User
+
+
+now = timezone.now()
+date_tomorrow = now + timedelta(days=1)
+old_date = timezone.now() - timedelta(days=91)
+recent_date = now - timedelta(days=10)
+
+
+class CrmBrevoSyncCompaniesCommandTest(TestCase):
+    @classmethod
+    def setUpTestData(cls):
+        """Siae instances initialization"""
+        cls.user_siae = UserFactory(kind=User.KIND_SIAE)
+        cls.siae_with_name = SiaeFactory(name="Test Company 1")
+        cls.siae_with_user = SiaeFactory(users=[cls.user_siae])
+        cls.siae_with_brevo_id = SiaeFactory(
+            brevo_company_id="123456789",
+            completion_rate=50,
+        )
+
+        cls.tender_1 = TenderFactory(deadline_date=date_tomorrow)
+        cls.tender_2 = TenderFactory(deadline_date=date_tomorrow)
+
+        TenderSiae.objects.create(
+            tender=cls.tender_1,
+            siae=cls.siae_with_user,
+            detail_contact_click_date=recent_date,
+        )
+
+        TenderSiae.objects.create(
+            tender=cls.tender_1,
+            siae=cls.siae_with_brevo_id,
+            email_send_date=recent_date,
+            detail_contact_click_date=old_date,
+        )
+
+        cls.siae_with_user_stats = Siae.objects.with_tender_stats().filter(id=cls.siae_with_user.id).first()
+        cls.siae_with_brevo_id_all_stats = (
+            Siae.objects.with_tender_stats().filter(id=cls.siae_with_brevo_id.id).first()
+        )
+        cls.siae_with_brevo_id_recent_stats = (
+            Siae.objects.with_tender_stats(since_days=90).filter(id=cls.siae_with_brevo_id.id).first()
+        )
+
+        # siae_with_brevo_id.extra_data initialization
+        cls.siae_with_brevo_id.extra_data = {
+            "brevo_company_data": {
+                "completion_rate": cls.siae_with_brevo_id.completion_rate
+                if cls.siae_with_brevo_id.completion_rate is not None
+                else 0,
+                "tender_received": cls.siae_with_brevo_id_recent_stats.tender_email_send_count_annotated,
+                "tender_interest": cls.siae_with_brevo_id_recent_stats.tender_detail_contact_click_count_annotated,
+            }
+        }
+        cls.siae_with_brevo_id.save()
+        cls.initial_extra_data = cls.siae_with_brevo_id.extra_data.copy()
+
+    def test_annotated_fields_set_up(self):
+        """Test annotated fields are correctly set up"""
+        self.assertEqual(
+            self.siae_with_user_stats.tender_email_send_count_annotated,
+            0,
+            "Le nombre total de besoins reçus devrait être 0",
+        )
+        self.assertEqual(
+            self.siae_with_user_stats.tender_detail_contact_click_count_annotated,
+            1,
+            "Le nombre total de besoins intéressés devrait être 1",
+        )
+        self.assertEqual(
+            self.siae_with_brevo_id_all_stats.tender_email_send_count_annotated,
+            1,
+            "Le nombre total de besoins reçus devrait être 1",
+        )
+        self.assertEqual(
+            self.siae_with_brevo_id_all_stats.tender_detail_contact_click_count_annotated,
+            1,
+            "Le nombre total de besoins intéressés devrait être 1",
+        )
+        self.assertEqual(
+            self.siae_with_brevo_id_recent_stats.tender_email_send_count_annotated,
+            1,
+            "Le nombre de besoins reçus dans les 90 derniers jours devrait être 1",
+        )
+        self.assertEqual(
+            self.siae_with_brevo_id_recent_stats.tender_detail_contact_click_count_annotated,
+            0,
+            "Le nombre de besoins intéressés dans les 90 derniers jours devrait être 0",
+        )
+
+    @patch("lemarche.utils.apis.api_brevo.create_or_update_company")
+    def test_new_siaes_are_synced_in_brevo(self, mock_create_or_update_company):
+        """Test new siaes are synced in brevo"""
+        call_command("crm_brevo_sync_companies")
+
+        self.assertEqual(mock_create_or_update_company.call_count, 3)
+
+    def test_siae_has_tender_stats(self):
+        self.assertIsNotNone(
+            self.siae_with_user_stats,
+            "Cette SIAE devrait avoir des statistiques sur les besoins.",
+        )
+        self.assertIsNotNone(
+            self.siae_with_brevo_id_all_stats,
+            "Cette SIAE devrait avoir des statistiques sur les besoins.",
+        )
+
+    def test_siae_extra_data_is_set_on_first_sync(self):
+        """
+        - Test siae is updated if extra_data is changed.
+        - Test siae.extra_data update does not erase existing data.
+        """
+        initial_extra_data = self.siae_with_user.extra_data.copy()
+        initial_extra_data["test_data"] = "test value"
+
+        self.siae_with_user.extra_data = initial_extra_data
+        self.siae_with_user.save(update_fields=["extra_data"])
+
+        call_command("crm_brevo_sync_companies", recently_updated=True)
+
+        self.siae_with_user.refresh_from_db()
+
+        expected_extra_data = {
+            "brevo_company_data": {
+                "completion_rate": self.siae_with_user.completion_rate
+                if self.siae_with_user.completion_rate is not None
+                else 0,
+                "tender_received": self.siae_with_user_stats.tender_email_send_count_annotated,
+                "tender_interest": self.siae_with_user_stats.tender_detail_contact_click_count_annotated,
+            },
+            "test_data": "test value",
+        }
+
+        self.assertNotEqual(initial_extra_data, expected_extra_data, "siae.extra_data aurait dû être mis à jour.")
+        self.assertEqual(
+            self.siae_with_user.extra_data, expected_extra_data, "siae.extra_data n'est pas conforme aux attentes."
+        )
+
+    def test_siae_extra_data_is_not_updated_if_no_changes(self):
+        """Test siae.extra_data is not updated if no changes."""
+        call_command("crm_brevo_sync_companies", recently_updated=True)
+
+        self.siae_with_brevo_id.refresh_from_db()
+        self.assertEqual(
+            self.initial_extra_data,
+            self.siae_with_brevo_id.extra_data,
+            "siae.extra_data a été mis à jour alors qu'il n'y avait pas de changement.",
+        )
+
+    def test_fields_update_within_90_days_and_ignore_older_changes(self):
+        """Test fields update within 90 days and ignore older changes."""
+        TenderSiae.objects.create(
+            tender=self.tender_2,
+            siae=self.siae_with_brevo_id,
+            email_send_date=now,
+            detail_contact_click_date=now,
+        )
+
+        call_command("crm_brevo_sync_companies", recently_updated=True)
+
+        self.siae_with_brevo_id_all_stats = (
+            Siae.objects.with_tender_stats().filter(id=self.siae_with_brevo_id.id).first()
+        )
+        self.siae_with_brevo_id_recent_stats = (
+            Siae.objects.with_tender_stats(since_days=90).filter(id=self.siae_with_brevo_id.id).first()
+        )
+
+        # Tender stats without date limit
+        self.assertEqual(
+            self.siae_with_brevo_id_all_stats.tender_email_send_count_annotated,
+            2,
+            "Le nombre total des besoins reçus devrait être 2",
+        )
+        self.assertEqual(
+            self.siae_with_brevo_id_all_stats.tender_detail_contact_click_count_annotated,
+            2,
+            "Le nombre de bsoins interessés devrait être 2",
+        )
+
+        # Tender stats with date limit
+        self.assertEqual(
+            self.siae_with_brevo_id_recent_stats.tender_email_send_count_annotated,
+            2,
+            "Le nombre de besoins reçus dans les 90 jours devraient être 2",
+        )
+        self.assertEqual(
+            self.siae_with_brevo_id_recent_stats.tender_detail_contact_click_count_annotated,
+            1,
+            "Les nombre de bsoins interessés dans les 90 jours devraient être 1",
+        )
+
+        expected_extra_data = {
+            "brevo_company_data": {
+                "completion_rate": self.siae_with_brevo_id.completion_rate
+                if self.siae_with_brevo_id.completion_rate is not None
+                else 0,
+                "tender_received": self.siae_with_brevo_id_recent_stats.tender_email_send_count_annotated,
+                "tender_interest": self.siae_with_brevo_id_recent_stats.tender_detail_contact_click_count_annotated,
+            }
+        }
+
+        self.assertNotEqual(
+            self.initial_extra_data,
+            expected_extra_data,
+            "Les valeurs récentes dans extra_data devraient être mises à jour en fonction du filtre de 90 jours.",
+        )
diff --git a/lemarche/siaes/models.py b/lemarche/siaes/models.py
index bd5ff0fc2..068b5a845 100644
--- a/lemarche/siaes/models.py
+++ b/lemarche/siaes/models.py
@@ -1,3 +1,4 @@
+from datetime import timedelta
 from uuid import uuid4
 
 from django.conf import settings
@@ -78,6 +79,24 @@ def get_city_filter(perimeter, with_country=False):
     return filters
 
 
+def count_field(field_name, date_limit):
+    """
+    Helper method to construct a conditional count annotation.
+    """
+    condition = (
+        Q(**{f"tendersiae__{field_name}__gte": date_limit})
+        if date_limit
+        else Q(**{f"tendersiae__{field_name}__isnull": False})
+    )
+    return Sum(
+        Case(
+            When(condition, then=1),
+            default=0,
+            output_field=IntegerField(),
+        )
+    )
+
+
 class SiaeGroupQuerySet(models.QuerySet):
     def with_siae_stats(self):
         return self.annotate(siae_count_annotated=Count("siaes", distinct=True))
@@ -425,41 +444,20 @@ def filter_with_tender_tendersiae_status(self, tender, tendersiae_status=None):
 
         return qs.distinct()
 
-    def with_tender_stats(self):
+    def with_tender_stats(self, since_days=None):
         """
-        Enrich each Siae with stats on their linked Tender
+        Enrich each Siae with stats on their linked Tender.
+        Optionally, limit the stats to the last `since_days` days.
         """
+        date_limit = timezone.now() - timedelta(days=since_days) if since_days else None
+
         return self.annotate(
             tender_count_annotated=Count("tenders", distinct=True),
-            tender_email_send_count_annotated=Sum(
-                Case(When(tendersiae__email_send_date__isnull=False, then=1), default=0, output_field=IntegerField())
-            ),
-            tender_email_link_click_count_annotated=Sum(
-                Case(
-                    When(tendersiae__email_link_click_date__isnull=False, then=1),
-                    default=0,
-                    output_field=IntegerField(),
-                )
-            ),
-            tender_detail_display_count_annotated=Sum(
-                Case(
-                    When(tendersiae__detail_display_date__isnull=False, then=1), default=0, output_field=IntegerField()
-                )
-            ),
-            tender_detail_contact_click_count_annotated=Sum(
-                Case(
-                    When(tendersiae__detail_contact_click_date__isnull=False, then=1),
-                    default=0,
-                    output_field=IntegerField(),
-                )
-            ),
-            tender_detail_not_interested_count_annotated=Sum(
-                Case(
-                    When(tendersiae__detail_not_interested_click_date__isnull=False, then=1),
-                    default=0,
-                    output_field=IntegerField(),
-                )
-            ),
+            tender_email_send_count_annotated=count_field("email_send_date", date_limit),
+            tender_email_link_click_count_annotated=count_field("email_link_click_date", date_limit),
+            tender_detail_display_count_annotated=count_field("detail_display_date", date_limit),
+            tender_detail_contact_click_count_annotated=count_field("detail_contact_click_date", date_limit),
+            tender_detail_not_interested_count_annotated=count_field("detail_not_interested_click_date", date_limit),
         )
 
     def with_brand_or_name(self, with_order_by=False):
diff --git a/lemarche/utils/apis/api_brevo.py b/lemarche/utils/apis/api_brevo.py
index b85317879..fd940eadc 100644
--- a/lemarche/utils/apis/api_brevo.py
+++ b/lemarche/utils/apis/api_brevo.py
@@ -146,6 +146,9 @@ def create_or_update_company(siae):
             "geo_range": siae.geo_range,
             "app_url": get_object_share_url(siae),
             "app_admin_url": get_object_admin_url(siae),
+            "taux_de_completion": siae.extra_data.get("brevo_company_data", {}).get("completion_rate"),
+            "nombre_de_besoins_recus": siae.extra_data.get("brevo_company_data", {}).get("tender_received"),
+            "nombre_de_besoins_interesses": siae.extra_data.get("brevo_company_data", {}).get("tender_interest"),
         },
     )