diff --git a/check_copyright.sh b/check_copyright.sh
new file mode 100755
index 000000000..0f801999a
--- /dev/null
+++ b/check_copyright.sh
@@ -0,0 +1,29 @@
+#!/bin/bash
+
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+set -eu
+EXITCODE=0
+error() { echo "$1"; EXITCODE=1; }
+
+EXCEPTION_PATTERNS=(
+    "^native/libcst/tests/fixtures/"
+    "^libcst/_add_slots\.py$"
+    "^libcst/tests/test_\(e2e\|fuzz\)\.py$"
+    "^libcst/_parser/base_parser\.py$"
+    "^libcst/_parser/parso/utils\.py$"
+    "^libcst/_parser/parso/pgen2/\(generator\|grammar_parser\)\.py$"
+    "^libcst/_parser/parso/python/\(py_token\|tokenize\)\.py$"
+    "^libcst/_parser/parso/tests/test_\(fstring\|tokenize\|utils\)\.py$"
+)
+
+
+while read filename; do \
+    if ! head -n 16 "$filename" | grep -q "Copyright (c) Meta Platforms, Inc. and affiliates."; then
+        error "Missing copyright in $filename"
+    fi
+done < <( git ls-tree -r --name-only HEAD | grep "\(.py\|\.sh\|\.rs\)$" | grep -v "${EXCEPTION_PATTERNS[@]/#/-e}" )
+exit $EXITCODE
\ No newline at end of file
diff --git a/libcst/_nodes/tests/test_match.py b/libcst/_nodes/tests/test_match.py
index a203ffefe..2f1e41935 100644
--- a/libcst/_nodes/tests/test_match.py
+++ b/libcst/_nodes/tests/test_match.py
@@ -1,4 +1,4 @@
-# Copyright (c) Facebook, Inc. and its affiliates.
+# Copyright (c) Meta Platforms, Inc. and affiliates.
 #
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
diff --git a/libcst/_parser/parso/python/token.py b/libcst/_parser/parso/python/token.py
index de8837193..ea3578744 100644
--- a/libcst/_parser/parso/python/token.py
+++ b/libcst/_parser/parso/python/token.py
@@ -1,4 +1,4 @@
-# Copyright (c) Meta Platforms, Inc. and its affiliates.
+# Copyright (c) Meta Platforms, Inc. and affiliates.
 #
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
diff --git a/libcst/_parser/py_whitespace_parser.py b/libcst/_parser/py_whitespace_parser.py
index a3c53a97f..b1fd9b5ed 100644
--- a/libcst/_parser/py_whitespace_parser.py
+++ b/libcst/_parser/py_whitespace_parser.py
@@ -1,4 +1,4 @@
-# Copyright (c) Meta Platforms, Inc. and its affiliates.
+# Copyright (c) Meta Platforms, Inc. and affiliates.
 #
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
diff --git a/libcst/_parser/types/py_config.py b/libcst/_parser/types/py_config.py
index cb91d5580..d77325912 100644
--- a/libcst/_parser/types/py_config.py
+++ b/libcst/_parser/types/py_config.py
@@ -1,4 +1,4 @@
-# Copyright (c) Meta Platforms, Inc. and its affiliates.
+# Copyright (c) Meta Platforms, Inc. and affiliates.
 #
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
diff --git a/libcst/_parser/types/py_token.py b/libcst/_parser/types/py_token.py
index 7fac5eb8c..d2f9b5379 100644
--- a/libcst/_parser/types/py_token.py
+++ b/libcst/_parser/types/py_token.py
@@ -1,4 +1,4 @@
-# Copyright (c) Meta Platforms, Inc. and its affiliates.
+# Copyright (c) Meta Platforms, Inc. and affiliates.
 #
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
diff --git a/libcst/_parser/types/py_whitespace_state.py b/libcst/_parser/types/py_whitespace_state.py
index 99047590d..6359e83eb 100644
--- a/libcst/_parser/types/py_whitespace_state.py
+++ b/libcst/_parser/types/py_whitespace_state.py
@@ -1,4 +1,4 @@
-# Copyright (c) Meta Platforms, Inc. and its affiliates.
+# Copyright (c) Meta Platforms, Inc. and affiliates.
 #
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
diff --git a/libcst/codemod/visitors/_apply_type_annotations.py b/libcst/codemod/visitors/_apply_type_annotations.py
index 24cd50a7e..ac954d2fc 100644
--- a/libcst/codemod/visitors/_apply_type_annotations.py
+++ b/libcst/codemod/visitors/_apply_type_annotations.py
@@ -1,4 +1,4 @@
-# Copyright (c) 2016-present, Meta Platforms, Inc.
+# Copyright (c) Meta Platforms, Inc. and affiliates.
 #
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree
diff --git a/libcst/codemod/visitors/tests/test_apply_type_annotations.py b/libcst/codemod/visitors/tests/test_apply_type_annotations.py
index 8689afbd2..03e5ffbd5 100644
--- a/libcst/codemod/visitors/tests/test_apply_type_annotations.py
+++ b/libcst/codemod/visitors/tests/test_apply_type_annotations.py
@@ -1,4 +1,4 @@
-# Copyright (c) 2016-present, Meta Platforms, Inc.
+# Copyright (c) Meta Platforms, Inc. and affiliates.
 #
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
diff --git a/native/libcst/Cargo.toml b/native/libcst/Cargo.toml
index b0e111eea..d2916e174 100644
--- a/native/libcst/Cargo.toml
+++ b/native/libcst/Cargo.toml
@@ -1,4 +1,4 @@
-# Copyright (c) Meta Platforms, Inc. and its affiliates.
+# Copyright (c) Meta Platforms, Inc. and affiliates.
 #
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
diff --git a/native/libcst/benches/parser_benchmark.rs b/native/libcst/benches/parser_benchmark.rs
index 7a12ebb32..ad96d867c 100644
--- a/native/libcst/benches/parser_benchmark.rs
+++ b/native/libcst/benches/parser_benchmark.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree
diff --git a/native/libcst/src/bin.rs b/native/libcst/src/bin.rs
index 1b42859a2..1517cce4a 100644
--- a/native/libcst/src/bin.rs
+++ b/native/libcst/src/bin.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree
diff --git a/native/libcst/src/lib.rs b/native/libcst/src/lib.rs
index 997ac0bc0..d2e475abf 100644
--- a/native/libcst/src/lib.rs
+++ b/native/libcst/src/lib.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree.
diff --git a/native/libcst/src/nodes/codegen.rs b/native/libcst/src/nodes/codegen.rs
index 99cc377a9..1ebf8d807 100644
--- a/native/libcst/src/nodes/codegen.rs
+++ b/native/libcst/src/nodes/codegen.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree.
diff --git a/native/libcst/src/nodes/expression.rs b/native/libcst/src/nodes/expression.rs
index 29f77deb0..570c55cab 100644
--- a/native/libcst/src/nodes/expression.rs
+++ b/native/libcst/src/nodes/expression.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree.
diff --git a/native/libcst/src/nodes/inflate_helpers.rs b/native/libcst/src/nodes/inflate_helpers.rs
index 262de5acd..8bf5c8aff 100644
--- a/native/libcst/src/nodes/inflate_helpers.rs
+++ b/native/libcst/src/nodes/inflate_helpers.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree
diff --git a/native/libcst/src/nodes/macros.rs b/native/libcst/src/nodes/macros.rs
index 76498b8e5..c9ed49c18 100644
--- a/native/libcst/src/nodes/macros.rs
+++ b/native/libcst/src/nodes/macros.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree.
diff --git a/native/libcst/src/nodes/mod.rs b/native/libcst/src/nodes/mod.rs
index b6be09df6..69463d998 100644
--- a/native/libcst/src/nodes/mod.rs
+++ b/native/libcst/src/nodes/mod.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree
diff --git a/native/libcst/src/nodes/module.rs b/native/libcst/src/nodes/module.rs
index 21e7e66c1..661c7bb74 100644
--- a/native/libcst/src/nodes/module.rs
+++ b/native/libcst/src/nodes/module.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree.
diff --git a/native/libcst/src/nodes/op.rs b/native/libcst/src/nodes/op.rs
index afa97d5dd..800f8ebd5 100644
--- a/native/libcst/src/nodes/op.rs
+++ b/native/libcst/src/nodes/op.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree.
diff --git a/native/libcst/src/nodes/parser_config.rs b/native/libcst/src/nodes/parser_config.rs
index acf140ee6..6dfdf544c 100644
--- a/native/libcst/src/nodes/parser_config.rs
+++ b/native/libcst/src/nodes/parser_config.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree.
diff --git a/native/libcst/src/nodes/py_cached.rs b/native/libcst/src/nodes/py_cached.rs
index 0a7fe6914..d23980516 100644
--- a/native/libcst/src/nodes/py_cached.rs
+++ b/native/libcst/src/nodes/py_cached.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree.
diff --git a/native/libcst/src/nodes/statement.rs b/native/libcst/src/nodes/statement.rs
index a740b2c9f..d68ec0557 100644
--- a/native/libcst/src/nodes/statement.rs
+++ b/native/libcst/src/nodes/statement.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree.
diff --git a/native/libcst/src/nodes/test_utils.rs b/native/libcst/src/nodes/test_utils.rs
index 109d471d8..675b493d7 100644
--- a/native/libcst/src/nodes/test_utils.rs
+++ b/native/libcst/src/nodes/test_utils.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree.
diff --git a/native/libcst/src/nodes/traits.rs b/native/libcst/src/nodes/traits.rs
index b6ab115c4..aabd27ef1 100644
--- a/native/libcst/src/nodes/traits.rs
+++ b/native/libcst/src/nodes/traits.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree
diff --git a/native/libcst/src/nodes/whitespace.rs b/native/libcst/src/nodes/whitespace.rs
index 13c4c8c4b..59b314c2f 100644
--- a/native/libcst/src/nodes/whitespace.rs
+++ b/native/libcst/src/nodes/whitespace.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree.
diff --git a/native/libcst/src/parser/errors.rs b/native/libcst/src/parser/errors.rs
index 6438ffbec..aae7fdb61 100644
--- a/native/libcst/src/parser/errors.rs
+++ b/native/libcst/src/parser/errors.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree
diff --git a/native/libcst/src/parser/grammar.rs b/native/libcst/src/parser/grammar.rs
index 8c1e5e344..3aaf71305 100644
--- a/native/libcst/src/parser/grammar.rs
+++ b/native/libcst/src/parser/grammar.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree.
diff --git a/native/libcst/src/parser/mod.rs b/native/libcst/src/parser/mod.rs
index 8e6ec8e14..05937ab3e 100644
--- a/native/libcst/src/parser/mod.rs
+++ b/native/libcst/src/parser/mod.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree
diff --git a/native/libcst/src/parser/numbers.rs b/native/libcst/src/parser/numbers.rs
index 99a7d7920..286a33c73 100644
--- a/native/libcst/src/parser/numbers.rs
+++ b/native/libcst/src/parser/numbers.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree
diff --git a/native/libcst/src/py.rs b/native/libcst/src/py.rs
index b938b691d..4cc30fbe5 100644
--- a/native/libcst/src/py.rs
+++ b/native/libcst/src/py.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree
diff --git a/native/libcst/src/tokenizer/core/mod.rs b/native/libcst/src/tokenizer/core/mod.rs
index 0dd60944e..9a8695556 100644
--- a/native/libcst/src/tokenizer/core/mod.rs
+++ b/native/libcst/src/tokenizer/core/mod.rs
@@ -1,4 +1,4 @@
-// This implementation is Copyright (c) Meta Platforms, Inc. and its affiliates.
+// This implementation is Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // CPython 3.10.0a5 and the original C code this is based on is
 // Copyright (c) 2001-2021 Python Software Foundation; All Rights Reserved
diff --git a/native/libcst/src/tokenizer/core/string_types.rs b/native/libcst/src/tokenizer/core/string_types.rs
index 27f0be362..8f9e0cf0f 100644
--- a/native/libcst/src/tokenizer/core/string_types.rs
+++ b/native/libcst/src/tokenizer/core/string_types.rs
@@ -1,4 +1,4 @@
-// This implementation is Copyright (c) Meta Platforms, Inc. and its affiliates.
+// This implementation is Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // CPython 3.10.0a5 and the original C code this is based on is
 // Copyright (c) 2001-2021 Python Software Foundation; All Rights Reserved
diff --git a/native/libcst/src/tokenizer/debug_utils.rs b/native/libcst/src/tokenizer/debug_utils.rs
index 543258a10..1e476a47f 100644
--- a/native/libcst/src/tokenizer/debug_utils.rs
+++ b/native/libcst/src/tokenizer/debug_utils.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree.
diff --git a/native/libcst/src/tokenizer/mod.rs b/native/libcst/src/tokenizer/mod.rs
index 60f1a20dc..9f7bbe2c7 100644
--- a/native/libcst/src/tokenizer/mod.rs
+++ b/native/libcst/src/tokenizer/mod.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree.
diff --git a/native/libcst/src/tokenizer/operators.rs b/native/libcst/src/tokenizer/operators.rs
index 94f708050..e5ef1526f 100644
--- a/native/libcst/src/tokenizer/operators.rs
+++ b/native/libcst/src/tokenizer/operators.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree.
diff --git a/native/libcst/src/tokenizer/tests.rs b/native/libcst/src/tokenizer/tests.rs
index 2be070d13..300e6d299 100644
--- a/native/libcst/src/tokenizer/tests.rs
+++ b/native/libcst/src/tokenizer/tests.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree.
diff --git a/native/libcst/src/tokenizer/text_position/char_width.rs b/native/libcst/src/tokenizer/text_position/char_width.rs
index 879e12834..10c65a41d 100644
--- a/native/libcst/src/tokenizer/text_position/char_width.rs
+++ b/native/libcst/src/tokenizer/text_position/char_width.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree.
diff --git a/native/libcst/src/tokenizer/text_position/mod.rs b/native/libcst/src/tokenizer/text_position/mod.rs
index f94d73110..9c394d527 100644
--- a/native/libcst/src/tokenizer/text_position/mod.rs
+++ b/native/libcst/src/tokenizer/text_position/mod.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree.
diff --git a/native/libcst/src/tokenizer/whitespace_parser.rs b/native/libcst/src/tokenizer/whitespace_parser.rs
index ec463f990..f09ce7895 100644
--- a/native/libcst/src/tokenizer/whitespace_parser.rs
+++ b/native/libcst/src/tokenizer/whitespace_parser.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree
diff --git a/native/libcst/tests/parser_roundtrip.rs b/native/libcst/tests/parser_roundtrip.rs
index b16a46f08..7618eaec4 100644
--- a/native/libcst/tests/parser_roundtrip.rs
+++ b/native/libcst/tests/parser_roundtrip.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree
diff --git a/native/libcst_derive/src/codegen.rs b/native/libcst_derive/src/codegen.rs
index 4fce05df7..7dee8adcb 100644
--- a/native/libcst_derive/src/codegen.rs
+++ b/native/libcst_derive/src/codegen.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree
diff --git a/native/libcst_derive/src/inflate.rs b/native/libcst_derive/src/inflate.rs
index 323160c11..e457b0683 100644
--- a/native/libcst_derive/src/inflate.rs
+++ b/native/libcst_derive/src/inflate.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree
diff --git a/native/libcst_derive/src/into_py.rs b/native/libcst_derive/src/into_py.rs
index 3530b3d8b..d37a92d33 100644
--- a/native/libcst_derive/src/into_py.rs
+++ b/native/libcst_derive/src/into_py.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree
diff --git a/native/libcst_derive/src/lib.rs b/native/libcst_derive/src/lib.rs
index 97d1e3214..12ce4ff1d 100644
--- a/native/libcst_derive/src/lib.rs
+++ b/native/libcst_derive/src/lib.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree
diff --git a/native/libcst_derive/src/parenthesized_node.rs b/native/libcst_derive/src/parenthesized_node.rs
index fe716510b..9165dd1ba 100644
--- a/native/libcst_derive/src/parenthesized_node.rs
+++ b/native/libcst_derive/src/parenthesized_node.rs
@@ -1,4 +1,4 @@
-// Copyright (c) Meta Platforms, Inc. and its affiliates.
+// Copyright (c) Meta Platforms, Inc. and affiliates.
 //
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree
diff --git a/native/roundtrip.sh b/native/roundtrip.sh
index 3f732143c..c75241f70 100755
--- a/native/roundtrip.sh
+++ b/native/roundtrip.sh
@@ -1,5 +1,10 @@
 #!/bin/bash
 
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
 PARSE=$(dirname $0)/target/release/parse
 
 exec diff -u "$1" <($PARSE < "$1")
diff --git a/stubs/libcst/native.pyi b/stubs/libcst/native.pyi
index 4741266b1..2a84d6a74 100644
--- a/stubs/libcst/native.pyi
+++ b/stubs/libcst/native.pyi
@@ -1,4 +1,4 @@
-# Copyright (c) Meta Platforms, Inc. and its affiliates.
+# Copyright (c) Meta Platforms, Inc. and affiliates.
 #
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
diff --git a/stubs/libcst_native/parser_config.pyi b/stubs/libcst_native/parser_config.pyi
index 412da05ef..1a095cfc1 100644
--- a/stubs/libcst_native/parser_config.pyi
+++ b/stubs/libcst_native/parser_config.pyi
@@ -1,4 +1,4 @@
-# Copyright (c) Meta Platforms, Inc. and its affiliates.
+# Copyright (c) Meta Platforms, Inc. and affiliates.
 #
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
diff --git a/stubs/libcst_native/token_type.pyi b/stubs/libcst_native/token_type.pyi
index 4dacfad7e..b51e8b483 100644
--- a/stubs/libcst_native/token_type.pyi
+++ b/stubs/libcst_native/token_type.pyi
@@ -1,4 +1,4 @@
-# Copyright (c) Meta Platforms, Inc. and its affiliates.
+# Copyright (c) Meta Platforms, Inc. and affiliates.
 #
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
diff --git a/stubs/libcst_native/tokenize.pyi b/stubs/libcst_native/tokenize.pyi
index 91c6d2e9b..12270da58 100644
--- a/stubs/libcst_native/tokenize.pyi
+++ b/stubs/libcst_native/tokenize.pyi
@@ -1,4 +1,4 @@
-# Copyright (c) Meta Platforms, Inc. and its affiliates.
+# Copyright (c) Meta Platforms, Inc. and affiliates.
 #
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
diff --git a/stubs/libcst_native/whitespace_parser.pyi b/stubs/libcst_native/whitespace_parser.pyi
index b2b51b54f..7c60189b8 100644
--- a/stubs/libcst_native/whitespace_parser.pyi
+++ b/stubs/libcst_native/whitespace_parser.pyi
@@ -1,4 +1,4 @@
-# Copyright (c) Meta Platforms, Inc. and its affiliates.
+# Copyright (c) Meta Platforms, Inc. and affiliates.
 #
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
diff --git a/stubs/libcst_native/whitespace_state.pyi b/stubs/libcst_native/whitespace_state.pyi
index 82db95278..75264a147 100644
--- a/stubs/libcst_native/whitespace_state.pyi
+++ b/stubs/libcst_native/whitespace_state.pyi
@@ -1,4 +1,4 @@
-# Copyright (c) Meta Platforms, Inc. and its affiliates.
+# Copyright (c) Meta Platforms, Inc. and affiliates.
 #
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.