diff --git a/scipy-stubs/_cyutility.pyi b/scipy-stubs/_cyutility.pyi
new file mode 100644
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--- /dev/null
+++ b/scipy-stubs/_cyutility.pyi
@@ -0,0 +1,105 @@
+import sys
+from _typeshed import Incomplete
+from builtins import memoryview as py_memoryview
+from types import EllipsisType
+from typing import Any, Final, Literal, Never, Self, SupportsIndex, TypeAlias, TypedDict, type_check_only
+from typing_extensions import CapsuleType, ReadOnly
+
+@type_check_only
+class CApiDict(TypedDict):
+    __pyx_collections_abc_Sequence: ReadOnly[CapsuleType]
+    generic: ReadOnly[CapsuleType]
+    strided: ReadOnly[CapsuleType]
+    indirect: ReadOnly[CapsuleType]
+    contiguous: ReadOnly[CapsuleType]
+    indirect_contiguous: ReadOnly[CapsuleType]
+    __pyx_memoryview_thread_locks_used: ReadOnly[CapsuleType]
+    __pyx_memoryview_thread_locks: ReadOnly[CapsuleType]
+    _allocate_buffer: ReadOnly[CapsuleType]
+    array_cwrapper: ReadOnly[CapsuleType]
+    memoryview_cwrapper: ReadOnly[CapsuleType]
+    memoryview_check: ReadOnly[CapsuleType]
+    _unellipsify: ReadOnly[CapsuleType]
+    assert_direct_dimensions: ReadOnly[CapsuleType]
+    memview_slice: ReadOnly[CapsuleType]
+    slice_memviewslice: ReadOnly[CapsuleType]
+    pybuffer_index: ReadOnly[CapsuleType]
+    transpose_memslice: ReadOnly[CapsuleType]
+    memoryview_fromslice: ReadOnly[CapsuleType]
+    get_slice_from_memview: ReadOnly[CapsuleType]
+    slice_copy: ReadOnly[CapsuleType]
+    memoryview_copy: ReadOnly[CapsuleType]
+    memoryview_copy_from_slice: ReadOnly[CapsuleType]
+    abs_py_ssize_t: ReadOnly[CapsuleType]
+    get_best_order: ReadOnly[CapsuleType]
+    _copy_strided_to_strided: ReadOnly[CapsuleType]
+    copy_strided_to_strided: ReadOnly[CapsuleType]
+    slice_get_size: ReadOnly[CapsuleType]
+    fill_contig_strides_array: ReadOnly[CapsuleType]
+    copy_data_to_temp: ReadOnly[CapsuleType]
+    _err_extents: ReadOnly[CapsuleType]
+    _err_dim: ReadOnly[CapsuleType]
+    _err: ReadOnly[CapsuleType]
+    _err_no_memory: ReadOnly[CapsuleType]
+    memoryview_copy_contents: ReadOnly[CapsuleType]
+    broadcast_leading: ReadOnly[CapsuleType]
+    refcount_copying: ReadOnly[CapsuleType]
+    refcount_objects_in_slice_with_gil: ReadOnly[CapsuleType]
+    refcount_objects_in_slice: ReadOnly[CapsuleType]
+    slice_assign_scalar: ReadOnly[CapsuleType]
+    _slice_assign_scalar: ReadOnly[CapsuleType]
+    __pyx_unpickle_Enum__set_state: ReadOnly[CapsuleType]
+    format_from_typeinfo: ReadOnly[CapsuleType]
+
+_ToIndex: TypeAlias = SupportsIndex | tuple[SupportsIndex, ...] | EllipsisType
+
+###
+
+__pyx_capi__: Final[CApiDict] = ...  # undocumented
+__test__: Final[dict[Any, Any]] = ...  # undocumented
+
+class Enum:  # undocumented
+    def __init__(self, /, name: str) -> None: ...
+    def __setstate__(self, state: tuple[str], /) -> None: ...
+
+class memoryview:  # undocumented
+    __pyx_vtable__: Final[CapsuleType]
+    base: Final[array]
+    itemsize: Final[int]
+    nbytes: Final[int]
+    ndim: Final[int]
+    size: int
+    shape: Final[tuple[int, ...]]
+    strides: Final[tuple[int, ...]]
+    suboffsets: Final[tuple[int, ...]]
+    @property
+    def T(self, /) -> Self: ...
+    def copy(self, /) -> Self: ...
+    def copy_fortran(self, /) -> Self: ...
+    def is_c_contig(self, /) -> bool: ...
+    def is_f_contig(self, /) -> bool: ...
+
+class _memoryviewslize(memoryview):  # undocumented
+    def count(self, /, value: Incomplete) -> int: ...
+    def index(self, /, value: Incomplete, start: SupportsIndex = 0, stop: SupportsIndex | None = None) -> int: ...
+
+class array:  # undocumented
+    memview: Final[memoryview]
+
+    def __new__(
+        array,  # pyright: ignore[reportSelfClsParameterName]
+        shape: tuple[int, *tuple[int, ...]],
+        itemsize: int,
+        format: bytes | str,
+        mode: Literal["c", "fortran"],
+        allocate_buffer: bool = False,
+    ) -> Self: ...
+    def __len__(self) -> int: ...
+    def __getitem__(self, index: _ToIndex, /) -> memoryview | Incomplete: ...
+    def __setitem__(self, index: _ToIndex, value: Incomplete, /) -> None: ...
+    def __delitem__(self, index: _ToIndex, /) -> None: ...
+    def __setstate__(self, state: Never, /) -> None: ...  # will raise `TypeError`
+    if sys.version_info >= (3, 12):
+        def __buffer__(self, flags: int, /) -> py_memoryview: ...
+    def count(self, /, value: Incomplete) -> int: ...
+    def index(self, /, value: Incomplete, start: SupportsIndex = 0, stop: SupportsIndex | None = None) -> int: ...