diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7f42bf7..1a14412 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 - Fix image (field : description) in to pdf
 - Fix massive action PDF export redirecting to item list instead of generating the PDF
+- Fix PDF export for assignable asset groups by properly handling multiple groups
 
 ## [4.1.2] - 2026-01-08
 
diff --git a/inc/common.class.php b/inc/common.class.php
index a883614..b40856f 100644
--- a/inc/common.class.php
+++ b/inc/common.class.php
@@ -30,6 +30,8 @@
  *  --------------------------------------------------------------------------
  */
 
+use Glpi\Features\AssignableItemInterface;
+
 abstract class PluginPdfCommon extends CommonGLPI
 {
     protected $obj = null;
@@ -37,6 +39,34 @@ abstract class PluginPdfCommon extends CommonGLPI
 
     public static $rightname = 'plugin_pdf';
 
+    protected static function getGroupName(CommonDBTM $item, int $group_type = Group_Item::GROUP_TYPE_NORMAL): string
+    {
+        $field = $group_type === Group_Item::GROUP_TYPE_TECH ? 'groups_id_tech' : 'groups_id';
+
+        if ($item instanceof AssignableItemInterface) {
+            // Many-to-many relation, stored in the glpi_groups_items pivot table
+            global $DB;
+            $it = $DB->request([
+                'SELECT' => 'groups_id',
+                'FROM'   => Group_Item::getTable(),
+                'WHERE'  => [
+                    'itemtype' => $item::class,
+                    'items_id' => $item->getID(),
+                    'type'     => $group_type,
+                ],
+            ]);
+            $group_ids = array_column(iterator_to_array($it), 'groups_id');
+        } else {
+            // One-to-one relation, direct column on the item (e.g. glpi_itilcategories)
+            $group_ids = (array) ($item->fields[$field] ?? 0);
+        }
+
+        return implode(', ', array_filter(array_map(
+            static fn($group_id) => Toolbox::stripTags(Dropdown::getDropdownName('glpi_groups', $group_id)),
+            $group_ids,
+        )));
+    }
+
     /**
      * Constructor, should intialize $this->obj property
     **/
@@ -59,6 +89,7 @@ public function addStandardTab($itemtype, array &$ong, array $options)
             $withtemplate = $options['withtemplate'];
         }
 
+        // @phpstan-ignore-next-line function.impossibleType (itemtype is not always a class-string at runtime, despite CommonGLPI's phpdoc)
         if (!is_numeric($itemtype) && ($obj = $dbu->getItemForItemtype($itemtype)) && (method_exists($itemtype, 'displayTabContentForPDF'))) {
             $titles = $obj->getTabNameForItem($this->obj, $withtemplate);
             if (!is_array($titles)) {
@@ -509,10 +540,7 @@ public static function mainLine(PluginPdfSimplePDF $pdf, $item, $field)
                     '<b><i>' . sprintf(
                         __s('%1$s: %2$s'),
                         __s('Group in charge of the hardware') . '</i></b>',
-                        Dropdown::getDropdownName(
-                            'glpi_groups',
-                            $item->fields['groups_id_tech'],
-                        ),
+                        self::getGroupName($item, Group_Item::GROUP_TYPE_TECH),
                     ),
                     '<b><i>' . sprintf(
                         __s('%1$s: %2$s'),
diff --git a/inc/computer.class.php b/inc/computer.class.php
index c8851cf..fab9647 100644
--- a/inc/computer.class.php
+++ b/inc/computer.class.php
@@ -89,12 +89,21 @@ public static function pdfMain(PluginPdfSimplePDF $pdf, Computer $computer)
             '<b><i>' . sprintf(
                 __('%1$s: %2$s'),
                 __('Group') . '</i></b>',
-                Dropdown::getDropdownName(
-                    'glpi_groups',
-                    $computer->fields['groups_id'],
-                ),
+                self::getGroupName($computer),
+            ),
+            '<b><i>' . sprintf(
+                __('%1$s: %2$s'),
+                __('Group in charge of the hardware') . '</i></b>',
+                self::getGroupName($computer, Group_Item::GROUP_TYPE_TECH),
+            ),
+        );
+
+        $pdf->displayLine(
+            '<b><i>' . sprintf(
+                __('%1$s: %2$s'),
+                __('UUID') . '</i></b>',
+                $computer->fields['uuid'],
             ),
-            '<b><i>' . sprintf(__('%1$s: %2$s'), __('UUID') . '</i></b>', $computer->fields['uuid']),
         );
 
         $pdf->displayLine(
diff --git a/inc/monitor.class.php b/inc/monitor.class.php
index 5d7ccc7..5a8516d 100644
--- a/inc/monitor.class.php
+++ b/inc/monitor.class.php
@@ -61,11 +61,7 @@ public static function pdfMain(PluginPdfSimplePDF $pdf, Monitor $item)
         PluginPdfCommon::mainLine($pdf, $item, 'user-management');
 
         $pdf->displayLine(
-            '<b><i>' . sprintf(
-                __s('%1$s: %2$s'),
-                __s('Group') . '</i></b>',
-                Dropdown::getDropdownName('glpi_groups', $item->fields['groups_id']),
-            ),
+            '<b><i>' . sprintf(__s('%1$s: %2$s'), __s('Group') . '</i></b>', self::getGroupName($item)),
             '<b><i>' . sprintf(
                 __s('%1$s: %2$s'),
                 __s('Size') . '</i></b>',
diff --git a/inc/networkequipment.class.php b/inc/networkequipment.class.php
index cbd1155..993d199 100644
--- a/inc/networkequipment.class.php
+++ b/inc/networkequipment.class.php
@@ -83,11 +83,7 @@ public static function pdfMain(PluginPdfSimplePDF $pdf, NetworkEquipment $item)
         );
 
         $pdf->displayLine(
-            '<b><i>' . sprintf(
-                __s('%1$s: %2$s'),
-                __s('Group') . '</i></b>',
-                Dropdown::getDropdownName('glpi_groups', $item->fields['groups_id']),
-            ),
+            '<b><i>' . sprintf(__s('%1$s: %2$s'), __s('Group') . '</i></b>', self::getGroupName($item)),
             '<b><i>' . __s('The MAC address and the IP of the equipment are included in an aggregated network port'),
             '<b><i>' . sprintf(
                 __s('%1$s: %2$s'),
diff --git a/inc/peripheral.class.php b/inc/peripheral.class.php
index 9f38312..e5ab9f2 100644
--- a/inc/peripheral.class.php
+++ b/inc/peripheral.class.php
@@ -63,11 +63,7 @@ public static function pdfMain(PluginPdfSimplePDF $pdf, Peripheral $item)
         PluginPdfCommon::mainLine($pdf, $item, 'user-management');
 
         $pdf->displayLine(
-            '<b><i>' . sprintf(
-                __s('%1$s: %2$s'),
-                __s('Group') . '</i></b>',
-                Dropdown::getDropdownName('glpi_groups', $item->fields['groups_id']),
-            ),
+            '<b><i>' . sprintf(__s('%1$s: %2$s'), __s('Group') . '</i></b>', self::getGroupName($item)),
             '<b><i>' . sprintf(__s('%1$s: %2$s'), __s('Brand') . '</i></b>', $item->fields['brand']),
         );
 
diff --git a/inc/phone.class.php b/inc/phone.class.php
index e35cf92..187fe79 100644
--- a/inc/phone.class.php
+++ b/inc/phone.class.php
@@ -64,16 +64,8 @@ public static function pdfMain(PluginPdfSimplePDF $pdf, Phone $item)
 
 
         $pdf->displayLine(
-            '<b><i>' . sprintf(
-                __s('%1$s: %2$s'),
-                __s('Group') . '</i></b>',
-                Dropdown::getDropdownName('glpi_groups', $item->fields['groups_id']),
-            ),
-            '<b><i>' . sprintf(
-                __s('%1$s: %2$s'),
-                __s('UUID') . '</i></b>',
-                $item->fields['uuid'],
-            ),
+            '<b><i>' . sprintf(__s('%1$s: %2$s'), __s('Group') . '</i></b>', self::getGroupName($item)),
+            '<b><i>' . sprintf(__s('%1$s: %2$s'), __s('UUID') . '</i></b>', $item->fields['uuid']),
         );
 
         $pdf->displayLine(
diff --git a/inc/printer.class.php b/inc/printer.class.php
index d493fc0..b3ab619 100644
--- a/inc/printer.class.php
+++ b/inc/printer.class.php
@@ -96,16 +96,8 @@ public static function pdfMain(PluginPdfSimplePDF $pdf, Printer $printer)
         );
 
         $pdf->displayLine(
-            '<b><i>' . sprintf(
-                __s('%1$s: %2$s'),
-                __s('Group') . '</i></b>',
-                Dropdown::getDropdownName('glpi_groups', $printer->fields['groups_id']),
-            ),
-            '<b><i>' . sprintf(
-                __s('%1$s: %2$s'),
-                __s('UUID') . '</i></b>',
-                $printer->fields['uuid'],
-            ),
+            '<b><i>' . sprintf(__s('%1$s: %2$s'), __s('Group') . '</i></b>', self::getGroupName($printer)),
+            '<b><i>' . sprintf(__s('%1$s: %2$s'), __s('UUID') . '</i></b>', $printer->fields['uuid']),
         );
 
 
diff --git a/inc/software.class.php b/inc/software.class.php
index 21a3526..c48fee3 100644
--- a/inc/software.class.php
+++ b/inc/software.class.php
@@ -93,10 +93,7 @@ public static function pdfMain(PluginPdfSimplePDF $pdf, Software $software)
             '<b><i>' . sprintf(
                 __s('%1$s: %2$s'),
                 __s('Group in charge of the hardware') . '</i></b>',
-                Dropdown::getDropdownName(
-                    'glpi_groups',
-                    $software->fields['groups_id_tech'],
-                ),
+                self::getGroupName($software, Group_Item::GROUP_TYPE_TECH),
             ),
             '<b><i>' . sprintf(
                 __s('%1$s: %2$s'),
@@ -109,7 +106,7 @@ public static function pdfMain(PluginPdfSimplePDF $pdf, Software $software)
             '<b><i>' . sprintf(
                 __s('%1$s: %2$s'),
                 __s('Group') . '</i></b>',
-                Dropdown::getDropdownName('glpi_groups', $software->fields['groups_id']),
+                self::getGroupName($software),
             ),
         );