diff --git a/lib/matplotlib/_c_internal_utils.pyi b/lib/matplotlib/_c_internal_utils.pyi
index 3a211223be80..3efc81bc8332 100644
--- a/lib/matplotlib/_c_internal_utils.pyi
+++ b/lib/matplotlib/_c_internal_utils.pyi
@@ -1 +1,7 @@
 def display_is_valid() -> bool: ...
+
+def Win32_GetForegroundWindow() -> int | None: ...
+def Win32_SetForegroundWindow(hwnd: int) -> None: ...
+def Win32_SetProcessDpiAwareness_max() -> None: ...
+def Win32_SetCurrentProcessExplicitAppUserModelID(appid: str) -> None: ...
+def Win32_GetCurrentProcessExplicitAppUserModelID() -> str | None: ...
diff --git a/lib/matplotlib/cbook.pyi b/lib/matplotlib/cbook.pyi
index 227a23df4168..a6ad1e54a51c 100644
--- a/lib/matplotlib/cbook.pyi
+++ b/lib/matplotlib/cbook.pyi
@@ -161,6 +161,10 @@ def normalize_kwargs(
 ) -> dict[str, Any]: ...
 def _lock_path(path: str | os.PathLike) -> contextlib.AbstractContextManager[None]: ...
 def _str_equal(obj: Any, s: str) -> bool: ...
+def _str_lower_equal(obj: Any, s: str) -> bool: ...
+def _array_perimeter(arr: np.ndarray) -> np.ndarray: ...
+def _unfold(arr: np.ndarray, axis: int, size: int, step: int) -> np.ndarray: ...
+def _array_patch_perimeters(x: np.ndarray, rstride: int, cstride: int) -> np.ndarray: ...
 def _setattr_cm(obj: Any, **kwargs) -> contextlib.AbstractContextManager[None]: ...
 
 class _OrderedSet(collections.abc.MutableSet):
@@ -172,4 +176,8 @@ class _OrderedSet(collections.abc.MutableSet):
     def discard(self, key) -> None: ...
 
 def _backend_module_name(name: str) -> str: ...
+def _setup_new_guiapp() -> None: ...
 def _format_approx(number: float, precision: int) -> str: ...
+def _g_sig_digits(value: float, delta: float) -> int: ...
+def _unikey_or_keysym_to_mplkey(unikey: str, keysym: str) -> str: ...
+def _auto_format_str(fmt: str, value: Any) -> str: ...