diff --git a/src/Symfony/Component/AssetMapper/ImportMap/ImportMapManager.php b/src/Symfony/Component/AssetMapper/ImportMap/ImportMapManager.php
index 1dbbf34d28d92..278d81e41c870 100644
--- a/src/Symfony/Component/AssetMapper/ImportMap/ImportMapManager.php
+++ b/src/Symfony/Component/AssetMapper/ImportMap/ImportMapManager.php
@@ -111,8 +111,8 @@ public function update(): array
      */
     public static function parsePackageName(string $packageName): ?array
     {
-        // https://regex101.com/r/58bl9L/1
-        $regex = '/(?:(?P<registry>[^:\n]+):)?(?P<package>[^@\n]+)(?:@(?P<version>[^\s\n]+))?/';
+        // https://regex101.com/r/d99BEc/1
+        $regex = '/(?:(?P<registry>[^:\n]+):)?((?P<package>@?[^@\n]+))(?:@(?P<version>[^\s\n]+))?/';
 
         return preg_match($regex, $packageName, $matches) ? $matches : null;
     }
diff --git a/src/Symfony/Component/AssetMapper/Tests/ImportMap/ImportMapManagerTest.php b/src/Symfony/Component/AssetMapper/Tests/ImportMap/ImportMapManagerTest.php
index 4c75084c8681d..857d15e77d8d9 100644
--- a/src/Symfony/Component/AssetMapper/Tests/ImportMap/ImportMapManagerTest.php
+++ b/src/Symfony/Component/AssetMapper/Tests/ImportMap/ImportMapManagerTest.php
@@ -422,6 +422,40 @@ public static function getPackageNameTests(): iterable
                 'version' => '^1.2.3',
             ],
         ];
+
+        yield 'namespaced_package_simple' => [
+            '@hotwired/stimulus',
+            [
+                'package' => '@hotwired/stimulus',
+                'registry' => '',
+            ],
+        ];
+
+        yield 'namespaced_package_with_version_constraint' => [
+            '@hotwired/stimulus@^1.2.3',
+            [
+                'package' => '@hotwired/stimulus',
+                'registry' => '',
+                'version' => '^1.2.3',
+            ],
+        ];
+
+        yield 'namespaced_package_with_registry' => [
+            'npm:@hotwired/stimulus',
+            [
+                'package' => '@hotwired/stimulus',
+                'registry' => 'npm',
+            ],
+        ];
+
+        yield 'namespaced_package_with_registry_and_version' => [
+            'npm:@hotwired/stimulus@^1.2.3',
+            [
+                'package' => '@hotwired/stimulus',
+                'registry' => 'npm',
+                'version' => '^1.2.3',
+            ],
+        ];
     }
 
     private function createImportMapManager(array $dirs, string $rootDir, string $publicPrefix = '/assets/', string $publicDirName = 'public'): ImportMapManager