diff --git a/ui/src/App.tsx b/ui/src/App.tsx
index 83025d87..f7f97eeb 100644
--- a/ui/src/App.tsx
+++ b/ui/src/App.tsx
@@ -83,6 +83,50 @@ function CloudAccessGate() {
   return <Outlet />;
 }
 
+function boardRoutes() {
+  return (
+    <>
+      <Route index element={<Navigate to="dashboard" replace />} />
+      <Route path="dashboard" element={<Dashboard />} />
+      <Route path="companies" element={<Companies />} />
+      <Route path="company/settings" element={<CompanySettings />} />
+      <Route path="org" element={<OrgChart />} />
+      <Route path="agents" element={<Navigate to="agents/all" replace />} />
+      <Route path="agents/all" element={<Agents />} />
+      <Route path="agents/active" element={<Agents />} />
+      <Route path="agents/paused" element={<Agents />} />
+      <Route path="agents/error" element={<Agents />} />
+      <Route path="agents/:agentId" element={<AgentDetail />} />
+      <Route path="agents/:agentId/:tab" element={<AgentDetail />} />
+      <Route path="agents/:agentId/runs/:runId" element={<AgentDetail />} />
+      <Route path="projects" element={<Projects />} />
+      <Route path="projects/:projectId" element={<ProjectDetail />} />
+      <Route path="projects/:projectId/overview" element={<ProjectDetail />} />
+      <Route path="projects/:projectId/issues" element={<ProjectDetail />} />
+      <Route path="projects/:projectId/issues/:filter" element={<ProjectDetail />} />
+      <Route path="issues" element={<Issues />} />
+      <Route path="issues/all" element={<Navigate to="issues" replace />} />
+      <Route path="issues/active" element={<Navigate to="issues" replace />} />
+      <Route path="issues/backlog" element={<Navigate to="issues" replace />} />
+      <Route path="issues/done" element={<Navigate to="issues" replace />} />
+      <Route path="issues/recent" element={<Navigate to="issues" replace />} />
+      <Route path="issues/:issueId" element={<IssueDetail />} />
+      <Route path="goals" element={<Goals />} />
+      <Route path="goals/:goalId" element={<GoalDetail />} />
+      <Route path="approvals" element={<Navigate to="approvals/pending" replace />} />
+      <Route path="approvals/pending" element={<Approvals />} />
+      <Route path="approvals/all" element={<Approvals />} />
+      <Route path="approvals/:approvalId" element={<ApprovalDetail />} />
+      <Route path="costs" element={<Costs />} />
+      <Route path="activity" element={<Activity />} />
+      <Route path="inbox" element={<Navigate to="inbox/new" replace />} />
+      <Route path="inbox/new" element={<Inbox />} />
+      <Route path="inbox/all" element={<Inbox />} />
+      <Route path="design-guide" element={<DesignGuide />} />
+    </>
+  );
+}
+
 export function App() {
   return (
     <Routes>
@@ -91,44 +135,13 @@ export function App() {
       <Route path="invite/:token" element={<InviteLandingPage />} />
 
       <Route element={<CloudAccessGate />}>
+        {/* Company-prefixed routes: /PAP/issues/PAP-214 */}
+        <Route path=":companyPrefix" element={<Layout />}>
+          {boardRoutes()}
+        </Route>
+        {/* Non-prefixed routes: /issues/PAP-214 */}
         <Route element={<Layout />}>
-          <Route index element={<Navigate to="/dashboard" replace />} />
-          <Route path="dashboard" element={<Dashboard />} />
-          <Route path="companies" element={<Companies />} />
-          <Route path="company/settings" element={<CompanySettings />} />
-          <Route path="org" element={<OrgChart />} />
-          <Route path="agents" element={<Navigate to="/agents/all" replace />} />
-          <Route path="agents/all" element={<Agents />} />
-          <Route path="agents/active" element={<Agents />} />
-          <Route path="agents/paused" element={<Agents />} />
-          <Route path="agents/error" element={<Agents />} />
-          <Route path="agents/:agentId" element={<AgentDetail />} />
-          <Route path="agents/:agentId/:tab" element={<AgentDetail />} />
-          <Route path="agents/:agentId/runs/:runId" element={<AgentDetail />} />
-          <Route path="projects" element={<Projects />} />
-          <Route path="projects/:projectId" element={<ProjectDetail />} />
-          <Route path="projects/:projectId/overview" element={<ProjectDetail />} />
-          <Route path="projects/:projectId/issues" element={<ProjectDetail />} />
-          <Route path="projects/:projectId/issues/:filter" element={<ProjectDetail />} />
-          <Route path="issues" element={<Issues />} />
-          <Route path="issues/all" element={<Navigate to="/issues" replace />} />
-          <Route path="issues/active" element={<Navigate to="/issues" replace />} />
-          <Route path="issues/backlog" element={<Navigate to="/issues" replace />} />
-          <Route path="issues/done" element={<Navigate to="/issues" replace />} />
-          <Route path="issues/recent" element={<Navigate to="/issues" replace />} />
-          <Route path="issues/:issueId" element={<IssueDetail />} />
-          <Route path="goals" element={<Goals />} />
-          <Route path="goals/:goalId" element={<GoalDetail />} />
-          <Route path="approvals" element={<Navigate to="/approvals/pending" replace />} />
-          <Route path="approvals/pending" element={<Approvals />} />
-          <Route path="approvals/all" element={<Approvals />} />
-          <Route path="approvals/:approvalId" element={<ApprovalDetail />} />
-          <Route path="costs" element={<Costs />} />
-          <Route path="activity" element={<Activity />} />
-          <Route path="inbox" element={<Navigate to="/inbox/new" replace />} />
-          <Route path="inbox/new" element={<Inbox />} />
-          <Route path="inbox/all" element={<Inbox />} />
-          <Route path="design-guide" element={<DesignGuide />} />
+          {boardRoutes()}
         </Route>
       </Route>
     </Routes>
diff --git a/ui/src/components/CompanyRail.tsx b/ui/src/components/CompanyRail.tsx
index f5c184eb..04770686 100644
--- a/ui/src/components/CompanyRail.tsx
+++ b/ui/src/components/CompanyRail.tsx
@@ -135,19 +135,26 @@ function SortableCompanyItem({
 export function CompanyRail() {
   const { companies, selectedCompanyId, setSelectedCompanyId } = useCompany();
   const { openOnboarding } = useDialog();
+  const sidebarCompanies = useMemo(
+    () => companies.filter((company) => company.status !== "archived"),
+    [companies],
+  );
 
   // Maintain sorted order in local state, synced from companies + localStorage
   const [orderedIds, setOrderedIds] = useState<string[]>(() =>
-    sortByStoredOrder(companies).map((c) => c.id)
+    sortByStoredOrder(sidebarCompanies).map((c) => c.id)
   );
 
   // Re-sync orderedIds from localStorage whenever companies changes.
   // Handles initial data load (companies starts as [] before query resolves)
   // and subsequent refetches triggered by live updates.
   useEffect(() => {
-    if (companies.length === 0) return;
-    setOrderedIds(sortByStoredOrder(companies).map((c) => c.id));
-  }, [companies]);
+    if (sidebarCompanies.length === 0) {
+      setOrderedIds([]);
+      return;
+    }
+    setOrderedIds(sortByStoredOrder(sidebarCompanies).map((c) => c.id));
+  }, [sidebarCompanies]);
 
   // Sync order across tabs via the native storage event
   useEffect(() => {
@@ -164,7 +171,7 @@ export function CompanyRail() {
 
   // Re-derive when companies change (new company added/removed)
   const orderedCompanies = useMemo(() => {
-    const byId = new Map(companies.map((c) => [c.id, c]));
+    const byId = new Map(sidebarCompanies.map((c) => [c.id, c]));
     const result: Company[] = [];
     for (const id of orderedIds) {
       const c = byId.get(id);
@@ -178,7 +185,7 @@ export function CompanyRail() {
       result.push(c);
     }
     return result;
-  }, [companies, orderedIds]);
+  }, [sidebarCompanies, orderedIds]);
 
   // Require 8px of movement before starting a drag to avoid interfering with clicks
   const sensors = useSensors(
diff --git a/ui/src/components/CompanySwitcher.tsx b/ui/src/components/CompanySwitcher.tsx
index 17ddb3fa..3f68b9e8 100644
--- a/ui/src/components/CompanySwitcher.tsx
+++ b/ui/src/components/CompanySwitcher.tsx
@@ -26,6 +26,7 @@ function statusDotColor(status?: string): string {
 
 export function CompanySwitcher() {
   const { companies, selectedCompany, setSelectedCompanyId } = useCompany();
+  const sidebarCompanies = companies.filter((company) => company.status !== "archived");
 
   return (
     <DropdownMenu>
@@ -48,7 +49,7 @@ export function CompanySwitcher() {
       <DropdownMenuContent align="start" className="w-[220px]">
         <DropdownMenuLabel>Companies</DropdownMenuLabel>
         <DropdownMenuSeparator />
-        {companies.map((company) => (
+        {sidebarCompanies.map((company) => (
           <DropdownMenuItem
             key={company.id}
             onClick={() => setSelectedCompanyId(company.id)}
@@ -58,7 +59,7 @@ export function CompanySwitcher() {
             <span className="truncate">{company.name}</span>
           </DropdownMenuItem>
         ))}
-        {companies.length === 0 && (
+        {sidebarCompanies.length === 0 && (
           <DropdownMenuItem disabled>No companies</DropdownMenuItem>
         )}
         <DropdownMenuSeparator />
diff --git a/ui/src/context/CompanyContext.tsx b/ui/src/context/CompanyContext.tsx
index 00a45d98..d22e2b3e 100644
--- a/ui/src/context/CompanyContext.tsx
+++ b/ui/src/context/CompanyContext.tsx
@@ -67,19 +67,24 @@ export function CompanyProvider({ children }: { children: ReactNode }) {
     },
     retry: false,
   });
+  const sidebarCompanies = useMemo(
+    () => companies.filter((company) => company.status !== "archived"),
+    [companies],
+  );
 
   // Auto-select first company when list loads
   useEffect(() => {
     if (companies.length === 0) return;
 
+    const selectableCompanies = sidebarCompanies.length > 0 ? sidebarCompanies : companies;
     const stored = localStorage.getItem(STORAGE_KEY);
-    if (stored && companies.some((c) => c.id === stored)) return;
-    if (selectedCompanyId && companies.some((c) => c.id === selectedCompanyId)) return;
+    if (stored && selectableCompanies.some((c) => c.id === stored)) return;
+    if (selectedCompanyId && selectableCompanies.some((c) => c.id === selectedCompanyId)) return;
 
-    const next = companies[0]!.id;
+    const next = selectableCompanies[0]!.id;
     setSelectedCompanyIdState(next);
     localStorage.setItem(STORAGE_KEY, next);
-  }, [companies, selectedCompanyId]);
+  }, [companies, selectedCompanyId, sidebarCompanies]);
 
   const setSelectedCompanyId = useCallback((companyId: string) => {
     setSelectedCompanyIdState(companyId);
diff --git a/ui/src/pages/CompanySettings.tsx b/ui/src/pages/CompanySettings.tsx
index d20deab7..c510c35f 100644
--- a/ui/src/pages/CompanySettings.tsx
+++ b/ui/src/pages/CompanySettings.tsx
@@ -11,7 +11,7 @@ import { CompanyPatternIcon } from "../components/CompanyPatternIcon";
 import { Field, ToggleField, HintIcon } from "../components/agent-config-primitives";
 
 export function CompanySettings() {
-  const { selectedCompany, selectedCompanyId } = useCompany();
+  const { companies, selectedCompany, selectedCompanyId, setSelectedCompanyId } = useCompany();
   const { setBreadcrumbs } = useBreadcrumbs();
   const queryClient = useQueryClient();
 
@@ -74,6 +74,22 @@ export function CompanySettings() {
       setInviteError(err instanceof Error ? err.message : "Failed to create invite");
     },
   });
+  const archiveMutation = useMutation({
+    mutationFn: ({
+      companyId,
+      nextCompanyId,
+    }: {
+      companyId: string;
+      nextCompanyId: string | null;
+    }) => companiesApi.archive(companyId).then(() => ({ nextCompanyId })),
+    onSuccess: async ({ nextCompanyId }) => {
+      if (nextCompanyId) {
+        setSelectedCompanyId(nextCompanyId);
+      }
+      await queryClient.invalidateQueries({ queryKey: queryKeys.companies.all });
+      await queryClient.invalidateQueries({ queryKey: queryKeys.companies.stats });
+    },
+  });
 
   useEffect(() => {
     setBreadcrumbs([
@@ -256,6 +272,48 @@ export function CompanySettings() {
           )}
         </div>
       </div>
+
+      {/* Archive */}
+      <div className="space-y-4">
+        <div className="text-xs font-medium text-amber-700 uppercase tracking-wide">
+          Archive
+        </div>
+        <div className="space-y-3 rounded-md border border-amber-300/60 bg-amber-100/30 px-4 py-4">
+          <p className="text-sm text-muted-foreground">
+            Archive this company to hide it from the sidebar. This persists in the database.
+          </p>
+          <div className="flex items-center gap-2">
+            <Button
+              size="sm"
+              variant="outline"
+              disabled={archiveMutation.isPending || selectedCompany.status === "archived"}
+              onClick={() => {
+                if (!selectedCompanyId) return;
+                const confirmed = window.confirm(
+                  `Archive company "${selectedCompany.name}"? It will be hidden from the sidebar.`,
+                );
+                if (!confirmed) return;
+                const nextCompanyId = companies.find((company) =>
+                  company.id !== selectedCompanyId && company.status !== "archived")?.id ?? null;
+                archiveMutation.mutate({ companyId: selectedCompanyId, nextCompanyId });
+              }}
+            >
+              {archiveMutation.isPending
+                ? "Archiving..."
+                : selectedCompany.status === "archived"
+                  ? "Already archived"
+                  : "Archive company"}
+            </Button>
+            {archiveMutation.isError && (
+              <span className="text-xs text-destructive">
+                {archiveMutation.error instanceof Error
+                  ? archiveMutation.error.message
+                  : "Failed to archive company"}
+              </span>
+            )}
+          </div>
+        </div>
+      </div>
     </div>
   );
 }