diff --git a/ui/src/lib/inbox.test.ts b/ui/src/lib/inbox.test.ts
index 8759d914761..37f0fc0fd5e 100644
--- a/ui/src/lib/inbox.test.ts
+++ b/ui/src/lib/inbox.test.ts
@@ -31,6 +31,7 @@ import {
   loadInboxFilterPreferences,
   loadInboxIssueColumns,
   loadInboxWorkItemGroupBy,
+  loadCollapsedInboxGroupKeys,
   loadLastInboxTab,
   matchesInboxIssueSearch,
   normalizeInboxIssueColumns,
@@ -40,6 +41,7 @@ import {
   resolveIssueWorkspaceGroup,
   resolveInboxSelectionIndex,
   saveInboxFilterPreferences,
+  saveCollapsedInboxGroupKeys,
   saveInboxIssueColumns,
   saveInboxWorkItemGroupBy,
   saveLastInboxTab,
@@ -1081,6 +1083,20 @@ describe("inbox helpers", () => {
     expect(loadInboxWorkItemGroupBy()).toBe("workspace");
   });
 
+  it("persists collapsed inbox groups per company", () => {
+    saveCollapsedInboxGroupKeys("company-1", new Set(["workspace:alpha", "workspace:beta"]));
+    saveCollapsedInboxGroupKeys("company-2", new Set(["type:approval"]));
+
+    expect(loadCollapsedInboxGroupKeys("company-1")).toEqual(new Set(["workspace:alpha", "workspace:beta"]));
+    expect(loadCollapsedInboxGroupKeys("company-2")).toEqual(new Set(["type:approval"]));
+  });
+
+  it("returns empty collapsed inbox groups for missing or invalid storage", () => {
+    expect(loadCollapsedInboxGroupKeys("company-1")).toEqual(new Set());
+    localStorage.setItem("paperclip:inbox:collapsed-groups:company-1", JSON.stringify({ nope: true }));
+    expect(loadCollapsedInboxGroupKeys("company-1")).toEqual(new Set());
+  });
+
   it("does not reset workspace grouping before experimental settings have loaded", () => {
     expect(shouldResetInboxWorkspaceGrouping("workspace", false, false)).toBe(false);
   });
diff --git a/ui/src/lib/inbox.ts b/ui/src/lib/inbox.ts
index 9f1373990b5..9060d0a2026 100644
--- a/ui/src/lib/inbox.ts
+++ b/ui/src/lib/inbox.ts
@@ -22,6 +22,7 @@ export const INBOX_ISSUE_COLUMNS_KEY = "paperclip:inbox:issue-columns";
 export const INBOX_NESTING_KEY = "paperclip:inbox:nesting";
 export const INBOX_GROUP_BY_KEY = "paperclip:inbox:group-by";
 export const INBOX_FILTER_PREFERENCES_KEY_PREFIX = "paperclip:inbox:filters";
+export const INBOX_COLLAPSED_GROUPS_KEY_PREFIX = "paperclip:inbox:collapsed-groups";
 export type InboxTab = "mine" | "recent" | "unread" | "all";
 export type InboxCategoryFilter =
   | "everything"
@@ -164,6 +165,11 @@ function getInboxFilterPreferencesStorageKey(companyId: string | null | undefine
   return `${INBOX_FILTER_PREFERENCES_KEY_PREFIX}:${companyId}`;
 }
 
+function getInboxCollapsedGroupsStorageKey(companyId: string | null | undefined): string | null {
+  if (!companyId) return null;
+  return `${INBOX_COLLAPSED_GROUPS_KEY_PREFIX}:${companyId}`;
+}
+
 export function loadInboxFilterPreferences(
   companyId: string | null | undefined,
 ): InboxFilterPreferences {
@@ -218,6 +224,36 @@ export function saveInboxFilterPreferences(
   }
 }
 
+export function loadCollapsedInboxGroupKeys(
+  companyId: string | null | undefined,
+): Set<string> {
+  const storageKey = getInboxCollapsedGroupsStorageKey(companyId);
+  if (!storageKey) return new Set();
+
+  try {
+    const raw = localStorage.getItem(storageKey);
+    if (!raw) return new Set();
+    const parsed = JSON.parse(raw);
+    return new Set(normalizeStringArray(parsed));
+  } catch {
+    return new Set();
+  }
+}
+
+export function saveCollapsedInboxGroupKeys(
+  companyId: string | null | undefined,
+  groupKeys: ReadonlySet<string>,
+) {
+  const storageKey = getInboxCollapsedGroupsStorageKey(companyId);
+  if (!storageKey) return;
+
+  try {
+    localStorage.setItem(storageKey, JSON.stringify([...groupKeys]));
+  } catch {
+    // Ignore localStorage failures.
+  }
+}
+
 export function loadDismissedInboxAlerts(): Set<string> {
   try {
     const raw = localStorage.getItem(DISMISSED_KEY);
diff --git a/ui/src/pages/Inbox.tsx b/ui/src/pages/Inbox.tsx
index e9f0ec8d6e4..19d2a3917e4 100644
--- a/ui/src/pages/Inbox.tsx
+++ b/ui/src/pages/Inbox.tsx
@@ -110,6 +110,7 @@ import {
   groupInboxWorkItems,
   isInboxEntityDismissed,
   isMineInboxTab,
+  loadCollapsedInboxGroupKeys,
   loadInboxFilterPreferences,
   loadInboxIssueColumns,
   loadInboxNesting,
@@ -120,6 +121,7 @@ import {
   resolveIssueWorkspaceName,
   resolveInboxSelectionIndex,
   saveInboxFilterPreferences,
+  saveCollapsedInboxGroupKeys,
   saveInboxIssueColumns,
   saveInboxNesting,
   saveInboxWorkItemGroupBy,
@@ -724,6 +726,7 @@ export function Inbox() {
     if (previousSelectedCompanyIdRef.current !== selectedCompanyId) {
       previousSelectedCompanyIdRef.current = selectedCompanyId;
       setFilterPreferences(loadInboxFilterPreferences(selectedCompanyId));
+      setCollapsedGroupKeys(loadCollapsedInboxGroupKeys(selectedCompanyId));
     }
   }, [selectedCompanyId]);
 
@@ -1107,15 +1110,16 @@ export function Inbox() {
     });
   }, []);
   const [collapsedInboxParents, setCollapsedInboxParents] = useState<Set<string>>(new Set());
-  const [collapsedGroupKeys, setCollapsedGroupKeys] = useState<Set<string>>(new Set());
+  const [collapsedGroupKeys, setCollapsedGroupKeys] = useState<Set<string>>(() => loadCollapsedInboxGroupKeys(selectedCompanyId));
   const toggleGroupCollapse = useCallback((groupKey: string) => {
     setCollapsedGroupKeys((prev) => {
       const next = new Set(prev);
       if (next.has(groupKey)) next.delete(groupKey);
       else next.add(groupKey);
+      saveCollapsedInboxGroupKeys(selectedCompanyId, next);
       return next;
     });
-  }, []);
+  }, [selectedCompanyId]);
   const groupedSections = useMemo<InboxGroupedSection[]>(() => [
     ...buildGroupedInboxSections(effectiveWorkItems, groupBy, nestingEnabled, inboxWorkspaceGrouping),
     ...buildGroupedInboxSections(