diff --git a/src/components/FAB/Menu.tsx b/src/components/FAB/Menu.tsx
index e4884647d6..f17ca2954e 100644
--- a/src/components/FAB/Menu.tsx
+++ b/src/components/FAB/Menu.tsx
@@ -454,6 +454,7 @@ const MorphingTrigger = ({
         visible={visible}
         onPress={onPress}
         aria-label={ariaLabel}
+        aria-expanded={expanded}
         testID={testID}
         widthShared={widthShared}
         heightShared={heightShared}
diff --git a/src/components/__tests__/FABMenu.test.tsx b/src/components/__tests__/FABMenu.test.tsx
index 0e03ff6823..dcabf1ae28 100644
--- a/src/components/__tests__/FABMenu.test.tsx
+++ b/src/components/__tests__/FABMenu.test.tsx
@@ -192,3 +192,20 @@ it('calls onDismiss when trigger is pressed while menu is open', async () => {
   await userEvent.press(screen.getByTestId('fab-shell'));
   expect(onDismiss).toHaveBeenCalledTimes(1);
 });
+
+it('exposes the expanded state on the trigger', async () => {
+  const menu = (expanded: boolean) => (
+    <FAB.Menu
+      expanded={expanded}
+      onDismiss={jest.fn()}
+      trigger={{ icon: 'plus', onPress: jest.fn(), 'aria-label': 'Actions' }}
+      items={makeItems()}
+    />
+  );
+
+  await render(menu(false));
+  expect(screen.getByRole('button', { name: 'Actions' })).toBeCollapsed();
+
+  await screen.rerender(menu(true));
+  expect(screen.getByRole('button', { name: 'Actions' })).toBeExpanded();
+});
diff --git a/src/components/__tests__/__snapshots__/FABMenu.test.tsx.snap b/src/components/__tests__/__snapshots__/FABMenu.test.tsx.snap
index 8b66657112..a53bf5199e 100644
--- a/src/components/__tests__/__snapshots__/FABMenu.test.tsx.snap
+++ b/src/components/__tests__/__snapshots__/FABMenu.test.tsx.snap
@@ -588,7 +588,7 @@ exports[`renders FAB.Menu closed 1`] = `
                 "busy": undefined,
                 "checked": undefined,
                 "disabled": true,
-                "expanded": undefined,
+                "expanded": false,
                 "selected": undefined,
               }
             }
@@ -1365,7 +1365,7 @@ exports[`renders FAB.Menu not expanded when trigger is not visible 1`] = `
                 "busy": undefined,
                 "checked": undefined,
                 "disabled": true,
-                "expanded": undefined,
+                "expanded": false,
                 "selected": undefined,
               }
             }
@@ -2142,7 +2142,7 @@ exports[`renders FAB.Menu open 1`] = `
                 "busy": undefined,
                 "checked": undefined,
                 "disabled": false,
-                "expanded": undefined,
+                "expanded": true,
                 "selected": undefined,
               }
             }
@@ -3623,7 +3623,7 @@ exports[`renders FAB.Menu with 6 items 1`] = `
                 "busy": undefined,
                 "checked": undefined,
                 "disabled": false,
-                "expanded": undefined,
+                "expanded": true,
                 "selected": undefined,
               }
             }
@@ -4401,7 +4401,7 @@ exports[`renders FAB.Menu with center alignment 1`] = `
                 "busy": undefined,
                 "checked": undefined,
                 "disabled": false,
-                "expanded": undefined,
+                "expanded": true,
                 "selected": undefined,
               }
             }
@@ -5238,7 +5238,7 @@ exports[`renders FAB.Menu with items having icons 1`] = `
                 "busy": undefined,
                 "checked": undefined,
                 "disabled": false,
-                "expanded": undefined,
+                "expanded": true,
                 "selected": undefined,
               }
             }
@@ -6015,7 +6015,7 @@ exports[`renders FAB.Menu with start alignment 1`] = `
                 "busy": undefined,
                 "checked": undefined,
                 "disabled": false,
-                "expanded": undefined,
+                "expanded": true,
                 "selected": undefined,
               }
             }