diff --git a/shelephant/dataset.py b/shelephant/dataset.py
index 6c3ee49..381e53d 100644
--- a/shelephant/dataset.py
+++ b/shelephant/dataset.py
@@ -1904,6 +1904,11 @@ class MyFmt(
     parser.add_argument(
         "--in-use", type=str, help="Select storage location in use (use 'none' for unavailable)."
     )
+    parser.add_argument(
+        "--not-on",
+        type=str,
+        help="List files that are not on a storage location.",
+    )
     parser.add_argument(
         "--on",
         type=str,
@@ -2004,6 +2009,12 @@ def status(args: list[str]):
     e[:, 1] = "here"
     data = np.vstack((data, e))
 
+    if args.not_on is not None:
+        name = args.not_on
+        iname = -(len(storage) - np.argmax(np.equal(storage, name)))
+        keep = np.equal(data[:, iname], "x")
+        data = data[keep, :]
+
     if len(args.on) > 0:
         keep = np.zeros((len(data)), dtype=bool)
         for name in args.on:
diff --git a/tests/test_dataset.py b/tests/test_dataset.py
index f57c8cc..e89b730 100644
--- a/tests/test_dataset.py
+++ b/tests/test_dataset.py
@@ -1428,6 +1428,38 @@ def test_status_on(self):
             ret = _plain(sio.getvalue())[1:]
             self.assertEqual(ret, expect)
 
+    def test_status_not_on(self):
+        with tempdir():
+            dataset = pathlib.Path("dataset")
+            source1 = pathlib.Path("source1")
+            source2 = pathlib.Path("source2")
+
+            dataset.mkdir()
+            source1.mkdir()
+            source2.mkdir()
+
+            with cwd(source1):
+                create_dummy_files(["a.txt", "b.txt", "c.txt", "d.txt"])
+
+            with cwd(source2):
+                create_dummy_files(["a.txt", "b.txt"])
+                create_dummy_files(["e.txt", "f.txt"], slice(4, None, None))
+
+            with cwd(dataset):
+                shelephant.dataset.init([])
+                shelephant.dataset.add(["source1", "../source1", "--rglob", "*.txt", "-q"])
+                shelephant.dataset.add(["source2", "../source2", "--rglob", "*.txt", "-q"])
+
+            with cwd(dataset), contextlib.redirect_stdout(io.StringIO()) as sio:
+                shelephant.dataset.status(["--table", "PLAIN_COLUMNS", "--not-on", "source1"])
+
+            expect = [
+                "e.txt source2 x ==",
+                "f.txt source2 x ==",
+            ]
+            ret = _plain(sio.getvalue())[1:]
+            self.assertEqual(ret, expect)
+
     def test_removed(self):
         with tempdir():
             dataset = pathlib.Path("dataset")