diff --git a/scripts/nrf52_flash_trim.py b/scripts/nrf52_flash_trim.py
index 9efa478bd..104243055 100644
--- a/scripts/nrf52_flash_trim.py
+++ b/scripts/nrf52_flash_trim.py
@@ -259,10 +259,9 @@ def compile_packed_help(build_env, node):
     return build_env.Object(node, **flags)
 
 
-def compile_shared_cli_replies(build_env, node):
-    """Keep constant reply copies out of line in the qualified CLI object only."""
+def _compile_shared_reply_copies(build_env, node, relative_path):
     source = Path(node.srcnode().get_abspath()).resolve()
-    expected = Path(build_env.subst("$PROJECT_DIR/src/helpers/CommonCLI.cpp")).resolve()
+    expected = Path(build_env.subst("$PROJECT_DIR/" + relative_path)).resolve()
     if source != expected:
         return node
     # GCC otherwise expands many constant strcpy replies into repeated stores.
@@ -273,6 +272,25 @@ def compile_shared_cli_replies(build_env, node):
     return build_env.Object(node, CCFLAGS=flags)
 
 
+def compile_shared_cli_replies(build_env, node):
+    """Keep constant reply copies out of line in the qualified CLI object only."""
+    return _compile_shared_reply_copies(build_env, node, "src/helpers/CommonCLI.cpp")
+
+
+def compile_shared_companion_replies(build_env, node):
+    return _compile_shared_reply_copies(build_env, node, "examples/companion_radio/MyMesh.cpp")
+
+
+def companion_shared_replies_policy(platform, mcu, env_name, src_filter,
+                                   flags=(), cppdefines=()):
+    if env_name != "RAK_4631_companion_radio_full" or str(mcu).lower() != "nrf52840":
+        return False
+    values = flag_defines(flags, cppdefines)
+    return (bool(companion_trim_policy(platform, mcu, src_filter, flags, cppdefines))
+            and ("MESH_CLI_SHARE_REPLIES" not in values
+                 or _enabled(values["MESH_CLI_SHARE_REPLIES"])))
+
+
 def install(build_env):
     platform = build_env.PioPlatform()
     mcu = build_env.BoardConfig().get("build.mcu", "")
@@ -304,6 +322,10 @@ def install(build_env):
     if rak_repeater and _enabled(values.get("MESH_CLI_SHARE_REPLIES",
                                             definitions.get("MESH_CLI_SHARE_REPLIES"))):
         build_env.AddBuildMiddleware(compile_shared_cli_replies, "*CommonCLI.cpp")
+    if not infrastructure and companion_shared_replies_policy(
+            platform.name, mcu, build_env["PIOENV"], build_env.get("SRC_FILTER", ()),
+            flags, cppdefines):
+        build_env.AddBuildMiddleware(compile_shared_companion_replies, "*MyMesh.cpp")
     if infrastructure:
         names = ("local OTA target name only" if definitions.get("OTA_TARGET_NAME_TABLE") == 0
                  or flag_defines(flags, cppdefines).get("OTA_TARGET_NAME_TABLE") == "0"
diff --git a/test/test_nrf52_flash_trim.py b/test/test_nrf52_flash_trim.py
index 9b4788840..74dad3fbc 100644
--- a/test/test_nrf52_flash_trim.py
+++ b/test/test_nrf52_flash_trim.py
@@ -124,6 +124,33 @@ class Nrf52FlashTrimTest(unittest.TestCase):
         other = Node(ROOT / "test/fixtures/CommonCLI.cpp")
         self.assertIs(TRIM.compile_shared_cli_replies(env, other), other)
 
+        companion = Node(ROOT / "examples/companion_radio/MyMesh.cpp")
+        result, flags = TRIM.compile_shared_companion_replies(env, companion)
+        self.assertIs(result, companion)
+        self.assertEqual(flags["CCFLAGS"], ["-Os", "-flto", "-fno-builtin-strcpy"])
+        self.assertEqual(env["CCFLAGS"], ["-Os", "-flto"])
+        for path in ("examples/simple_repeater/MyMesh.cpp", "test/fixtures/MyMesh.cpp",
+                     "src/helpers/CommonCLI.cpp", "src/helpers/RadioProfileCLI.cpp"):
+            other = Node(ROOT / path)
+            self.assertIs(TRIM.compile_shared_companion_replies(env, other), other)
+
+    def test_companion_shared_replies_are_limited_to_the_qualified_rak_full_image(self):
+        defaults = dict(platform="nordicnrf52", mcu="nrf52840",
+                        env_name="RAK_4631_companion_radio_full",
+                        src_filter="+<../examples/companion_radio/*.cpp>")
+        self.assertTrue(TRIM.companion_shared_replies_policy(**defaults))
+        for changes in (dict(env_name="RAK_3401_companion_radio_full"),
+                        dict(env_name="RAK_4631_companion_radio_usb"),
+                        dict(env_name="custom_companion_radio_full"),
+                        dict(mcu="nrf52832"), dict(platform="ststm32"),
+                        dict(src_filter="+<../examples/simple_repeater>"),
+                        dict(src_filter="+<../examples/companion_radio> +<../examples/simple_sensor>"),
+                        dict(flags="-DMESH_CLI_SHARE_REPLIES=0"),
+                        dict(flags="-UMESH_CLI_SHARE_REPLIES"),
+                        dict(flags="-DMESH_NRF52_COMPANION_TRIM=0")):
+            with self.subTest(changes=changes):
+                self.assertFalse(TRIM.companion_shared_replies_policy(**(defaults | changes)))
+
     def test_local_names_do_not_change_companion_or_unqualified_roles(self):
         for options in (dict(name="RAK_4631_companion_radio_full"),
                         dict(role="custom"), dict(platform="espressif32", mcu="esp32")):