diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
index 20217c32..b68d2da8 100644
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -22,3 +22,16 @@
 /domains/swaps/          @MetaMask/swaps-engineers
 /domains/testing/        @MetaMask/qa
 /domains/ui/             @MetaMask/design-system-engineers
+
+# Repo overlays name one client, so that client's platform team owns them by default.
+# These follow the domain rules above because the last matching pattern wins.
+**/repos/metamask-extension.md                              @MetaMask/extension-platform
+**/repos/metamask-mobile.md                                 @MetaMask/mobile-platform
+**/repos/core.md                                            @MetaMask/core-platform
+
+# Domains whose own team keeps its overlays.
+/domains/assets/**/repos/                                   @MetaMask/metamask-assets
+/domains/perps/**/repos/                                    @MetaMask/perps
+/domains/swaps/**/repos/                                    @MetaMask/swaps-engineers
+/domains/testing/**/repos/                                  @MetaMask/qa
+/domains/ui/**/repos/                                       @MetaMask/design-system-engineers