diff --git a/frontend/pages/DashboardPage/cards/ActivityFeed/GlobalActivityItem/GlobalActivityItem.tsx b/frontend/pages/DashboardPage/cards/ActivityFeed/GlobalActivityItem/GlobalActivityItem.tsx
index d7fffd988b..423ea53824 100644
--- a/frontend/pages/DashboardPage/cards/ActivityFeed/GlobalActivityItem/GlobalActivityItem.tsx
+++ b/frontend/pages/DashboardPage/cards/ActivityFeed/GlobalActivityItem/GlobalActivityItem.tsx
@@ -1340,7 +1340,7 @@ const GlobalActivityItem = ({
   const hasDetails = ACTIVITIES_WITH_DETAILS.has(activity.type);
 
   const renderActivityPrefix = () => {
-    const DEFAULT_ACTOR_DISPLAY = <b>{activity.actor_full_name} </b>;
+    const DEFAULT_ACTOR_DISPLAY = <b>{activity.actor_full_name ?? "Fleet"} </b>;
 
     switch (activity.type) {
       case ActivityType.UserLoggedIn:
diff --git a/frontend/pages/hosts/details/cards/Activity/ActivityItems/InstalledSoftwareActivityItem/InstalledSoftwareActivityItem.tsx b/frontend/pages/hosts/details/cards/Activity/ActivityItems/InstalledSoftwareActivityItem/InstalledSoftwareActivityItem.tsx
index 16cd34a441..6d0a623cc4 100644
--- a/frontend/pages/hosts/details/cards/Activity/ActivityItems/InstalledSoftwareActivityItem/InstalledSoftwareActivityItem.tsx
+++ b/frontend/pages/hosts/details/cards/Activity/ActivityItems/InstalledSoftwareActivityItem/InstalledSoftwareActivityItem.tsx
@@ -21,7 +21,7 @@ const InstalledSoftwareActivityItem = ({
   const actorDisplayName = self_service ? (
     <span>End user</span>
   ) : (
-    <b>{actorName}</b>
+    <b>{actorName ?? "Fleet"}</b>
   );
 
   return (
diff --git a/frontend/pages/hosts/details/cards/Activity/ActivityItems/RanScriptActivityItem/RanScriptActivityItem.tsx b/frontend/pages/hosts/details/cards/Activity/ActivityItems/RanScriptActivityItem/RanScriptActivityItem.tsx
index 19b8b97bd6..ae4be92455 100644
--- a/frontend/pages/hosts/details/cards/Activity/ActivityItems/RanScriptActivityItem/RanScriptActivityItem.tsx
+++ b/frontend/pages/hosts/details/cards/Activity/ActivityItems/RanScriptActivityItem/RanScriptActivityItem.tsx
@@ -26,7 +26,7 @@ const RanScriptActivityItem = ({
       isSoloActivity={isSoloActivity}
       hideCancel={hideCancel}
     >
-      <b>{activity.actor_full_name}</b>
+      <b>{activity.actor_full_name ?? "Fleet"}</b>
       <>
         {" "}
         {ranScriptPrefix}{" "}