diff --git a/loko/stock/templates/stock/warehouses_index.html b/loko/stock/templates/stock/warehouses_index.html
index 60853e8..725d23a 100644
--- a/loko/stock/templates/stock/warehouses_index.html
+++ b/loko/stock/templates/stock/warehouses_index.html
@@ -96,21 +96,21 @@
         <div class="col-md-6" id="col-left" style="max-height: calc(100vh - 100px); overflow: auto;">
             <ul class="nav nav-tabs" id="tablesTab" role="tablist">
                 <li class="nav-item" role="presentation">
-                  <button class="nav-link active" id="warehouses-table-tab" data-bs-toggle="tab" data-bs-target="#warehouses-table-content" type="button" role="tab" aria-controls="warehouses-table" aria-selected="true" style="color: black;"><i class="bi bi-buildings"></i> {% translate "Entrepôts" %}</button>
+                  <button class="nav-link {% if active_tab == 'warehouses' or not active_tab %}active{% endif %}" id="warehouses-table-tab" data-bs-toggle="tab" data-bs-target="#warehouses-table-content" type="button" role="tab" aria-controls="warehouses-table" aria-selected="{% if active_tab == 'warehouses' or not active_tab %}true{% else %}false{% endif %}" style="color: black;"><i class="bi bi-buildings"></i> {% translate "Entrepôts" %}</button>
                 </li>
                 <li class="nav-item" role="presentation">
-                  <button class="nav-link" id="warehouse-locations-table-tab" data-bs-toggle="tab" data-bs-target="#warehouse-locations-table-content" type="button" role="tab" aria-controls="warehouse-locations-table" aria-selected="false" style="color: black;"><i class="bi bi-geo-alt"></i> {% translate "Emplacements" %}</button>
+                  <button class="nav-link {% if active_tab == 'warehouse-locations' %}active{% endif %}" id="warehouse-locations-table-tab" data-bs-toggle="tab" data-bs-target="#warehouse-locations-table-content" type="button" role="tab" aria-controls="warehouse-locations-table" aria-selected="{% if active_tab == 'warehouse-locations' %}true{% else %}false{% endif %}" style="color: black;"><i class="bi bi-geo-alt"></i> {% translate "Emplacements" %}</button>
                 </li>
                 <li class="nav-item" role="presentation">
-                    <button class="nav-link" id="products-table-tab" data-bs-toggle="tab" data-bs-target="#products-table-content" type="button" role="tab" aria-controls="products-table" aria-selected="false" style="color: black;"><i class="bi bi-box-seam"></i> {% translate "Produits" %}</button>
+                    <button class="nav-link {% if active_tab == 'products' %}active{% endif %}" id="products-table-tab" data-bs-toggle="tab" data-bs-target="#products-table-content" type="button" role="tab" aria-controls="products-table" aria-selected="{% if active_tab == 'products' %}true{% else %}false{% endif %}" style="color: black;"><i class="bi bi-box-seam"></i> {% translate "Produits" %}</button>
                 </li>
                 <li class="nav-item" role="presentation">
-                    <button class="nav-link" id="serialized-items-table-tab" data-bs-toggle="tab" data-bs-target="#serialized-items-table-content" type="button" role="tab" aria-controls="serialized-items-table" aria-selected="false" style="color: black;"><i class="bi bi-upc-scan"></i> {% translate "Articles tracés" %}</button>
+                    <button class="nav-link {% if active_tab == 'serialized-items' %}active{% endif %}" id="serialized-items-table-tab" data-bs-toggle="tab" data-bs-target="#serialized-items-table-content" type="button" role="tab" aria-controls="serialized-items-table" aria-selected="{% if active_tab == 'serialized-items' %}true{% else %}false{% endif %}" style="color: black;"><i class="bi bi-upc-scan"></i> {% translate "Articles tracés" %}</button>
                 </li>
                 {# Onglet Conception masqué (modèle conservé, non supprimé) #}
             </ul>
             <div class="tab-content my-2" id="tablesTabContent">
-                <div class="tab-pane fade show active" id="warehouses-table-content" role="tabpanel" aria-labelledby="warehouses-table-tab">
+                <div class="tab-pane fade {% if active_tab == 'warehouses' or not active_tab %}show active{% endif %}" id="warehouses-table-content" role="tabpanel" aria-labelledby="warehouses-table-tab">
                     <!-- Spinner -->
                     <div id="warehouses-spinner" class="table-spinner">
                         <div class="spinner-border text-primary" role="status">
@@ -126,7 +126,7 @@
                         </table>
                     </div>
                 </div>
-                <div class="tab-pane fade show" id="warehouse-locations-table-content" role="tabpanel" aria-labelledby="warehouse-locations-table-tab">
+                <div class="tab-pane fade {% if active_tab == 'warehouse-locations' %}show active{% endif %}" id="warehouse-locations-table-content" role="tabpanel" aria-labelledby="warehouse-locations-table-tab">
                     <div id="warehouse-locations-table-container">
                         <table id="warehouse-locations-table" class="table"
                             data-height="500"
@@ -177,7 +177,7 @@
                         </table>
                     </div>
                 </div>
-                <div class="tab-pane fade show" id="products-table-content" role="tabpanel" aria-labelledby="products-table-tab">
+                <div class="tab-pane fade {% if active_tab == 'products' %}show active{% endif %}" id="products-table-content" role="tabpanel" aria-labelledby="products-table-tab">
                     <!-- Bouton ajout produit -->
                     {% if can_manage_products %}
                     <div class="d-flex justify-content-end mt-2 mb-1">
@@ -274,7 +274,7 @@
                 {# <div class="tab-pane fade show" id="designs-table-content" ...> ... </div> #}
 
                 <!-- Onglet Articles tracés -->
-                <div class="tab-pane fade" id="serialized-items-table-content" role="tabpanel" aria-labelledby="serialized-items-table-tab">
+                <div class="tab-pane fade {% if active_tab == 'serialized-items' %}show active{% endif %}" id="serialized-items-table-content" role="tabpanel" aria-labelledby="serialized-items-table-tab">
                     {% if can_manage_products %}
                     <div class="d-flex justify-content-end mt-2 mb-1">
                         <a href="{% url 'stock:serialized_item_create' %}" class="btn btn-sm btn-primary">
@@ -284,7 +284,7 @@
                     {% endif %}
 
                     <form method="get" action="{% url 'stock:warehouses' %}" class="card mb-2 border-0 bg-light">
-                        <input type="hidden" name="tab" value="serialized-items-table">
+                        <input type="hidden" name="tab" value="serialized-items">
                         <div class="card-body py-2 row g-2 align-items-end">
                             <div class="col-md-4">
                                 <label class="form-label fw-semibold small mb-1">{% translate "Recherche" %}</label>
@@ -313,7 +313,7 @@
                                 <button type="submit" class="btn btn-sm btn-primary">
                                     <i class="bi bi-search"></i> {% translate "Filtrer" %}
                                 </button>
-                                <a href="{% url 'stock:warehouses' %}?tab=serialized-items-table" class="btn btn-sm btn-outline-secondary ms-1">
+                                <a href="{% url 'stock:warehouses' %}?tab=serialized-items" class="btn btn-sm btn-outline-secondary ms-1">
                                     <i class="bi bi-x-circle"></i> {% translate "Réinitialiser" %}
                                 </a>
                             </div>
@@ -446,14 +446,27 @@
             document.querySelectorAll('#tablesTab button[data-bs-toggle="tab"]').forEach(function(btn) {
                 btn.addEventListener('shown.bs.tab', function() {
                     const tabName = btn.id.replace('-table-tab', '');
-                    history.replaceState(null, '', '?tab=' + tabName);
+                    const currentUrl = new URL(window.location.href);
+                    if (currentUrl.searchParams.get('tab') !== tabName) {
+                        if (tabName === 'serialized-items') {
+                            currentUrl.searchParams.set('tab', tabName);
+                        } else {
+                            currentUrl.search = '?tab=' + tabName;
+                        }
+                        history.replaceState(null, '', currentUrl.pathname + currentUrl.search);
+                    }
                 });
             });
 
             // Activer l'onglet indiqué par ?tab= au chargement de la page
-            const tab = new URLSearchParams(window.location.search).get('tab');
+            const urlParams = new URLSearchParams(window.location.search);
+            let tab = urlParams.get('tab');
+            if (!tab && (urlParams.get('si_q') || urlParams.get('si_product') || urlParams.get('si_status'))) {
+                tab = 'serialized-items';
+            }
             if (tab) {
-                const tabBtn = document.getElementById(tab + '-table-tab');
+                const normalizedTab = tab.replace(/-table$/, '');
+                const tabBtn = document.getElementById(normalizedTab + '-table-tab') || document.getElementById(tab + '-table-tab');
                 if (tabBtn) {
                     tabBtn.click();
                     tabBtn.blur();
diff --git a/loko/stock/tests.py b/loko/stock/tests.py
index 4fddad9..9c71da9 100644
--- a/loko/stock/tests.py
+++ b/loko/stock/tests.py
@@ -1162,6 +1162,26 @@ class ProductLocationsTests(TestCase):
         self.assertContains(response, "SN-MOB-TEST")
         self.assertContains(response, "editItemMobileModal")
 
+    def test_warehouses_index_serialized_items_tab_active(self):
+        response = self.client.get(reverse("stock:warehouses") + "?tab=serialized-items")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.context["active_tab"], "serialized-items")
+
+    def test_warehouses_index_serialized_items_table_legacy_tab_active(self):
+        response = self.client.get(reverse("stock:warehouses") + "?tab=serialized-items-table")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.context["active_tab"], "serialized-items")
+
+    def test_warehouses_index_filter_by_query_activates_serialized_items_tab(self):
+        response = self.client.get(reverse("stock:warehouses") + "?si_q=makita")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.context["active_tab"], "serialized-items")
+
+    def test_warehouses_index_default_tab_is_warehouses(self):
+        response = self.client.get(reverse("stock:warehouses"))
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.context["active_tab"], "warehouses")
+
 
 class AssociateStockLocationsCommandTests(TestCase):
     def setUp(self):
diff --git a/loko/stock/views.py b/loko/stock/views.py
index fc7a66c..5d52a1c 100644
--- a/loko/stock/views.py
+++ b/loko/stock/views.py
@@ -100,6 +100,14 @@ def warehouses_index(request):
     si_query = request.GET.get("si_q", "").strip()
     si_product_id = request.GET.get("si_product", "").strip()
     si_status = request.GET.get("si_status", "").strip()
+    tab_param = request.GET.get("tab", "").strip()
+
+    if tab_param in ("serialized-items", "serialized-items-table") or (not tab_param and (si_query or si_product_id or si_status)):
+        active_tab = "serialized-items"
+    elif tab_param in ("products", "warehouse-locations", "warehouses"):
+        active_tab = tab_param
+    else:
+        active_tab = "warehouses"
 
     serialized_items_qs = SerializedItem.objects.select_related(
         "product", "current_location__warehouse", "current_holder"
@@ -129,6 +137,7 @@ def warehouses_index(request):
         "si_product_id": si_product_id,
         "si_status": si_status,
         "si_status_choices": SerializedItem.STATUS_CHOICES,
+        "active_tab": active_tab,
     }
     return render(request, "stock/warehouses_index.html", context)