diff --git a/ui/src/components/CompanySettingsSidebar.test.tsx b/ui/src/components/CompanySettingsSidebar.test.tsx
index 452219b3..f2f6174b 100644
--- a/ui/src/components/CompanySettingsSidebar.test.tsx
+++ b/ui/src/components/CompanySettingsSidebar.test.tsx
@@ -53,6 +53,10 @@ vi.mock("./SidebarNavItem", () => ({
   },
 }));
 
+vi.mock("./SidebarCompanyMenu", () => ({
+  SidebarCompanyMenu: () => <div>Workspace switcher</div>,
+}));
+
 vi.mock("@/api/sidebarBadges", () => ({
   sidebarBadgesApi: mockSidebarBadgesApi,
 }));
diff --git a/ui/src/components/CompanySettingsSidebar.tsx b/ui/src/components/CompanySettingsSidebar.tsx
index f0a2b378..4acebfec 100644
--- a/ui/src/components/CompanySettingsSidebar.tsx
+++ b/ui/src/components/CompanySettingsSidebar.tsx
@@ -7,6 +7,7 @@ import { queryKeys } from "@/lib/queryKeys";
 import { useCompany } from "@/context/CompanyContext";
 import { useSidebar } from "@/context/SidebarContext";
 import { SidebarNavItem } from "./SidebarNavItem";
+import { SidebarCompanyMenu } from "./SidebarCompanyMenu";
 
 export function CompanySettingsSidebar() {
   const { selectedCompany, selectedCompanyId } = useCompany();
@@ -32,7 +33,10 @@ export function CompanySettingsSidebar() {
 
   return (
     <aside className="w-60 h-full min-h-0 border-r border-border bg-background flex flex-col">
-      <div className="flex flex-col gap-1 px-3 py-3 shrink-0">
+      <div className="flex items-center gap-1 px-3 h-12 shrink-0">
+        <SidebarCompanyMenu />
+      </div>
+      <div className="flex flex-col gap-1 px-3 pb-3 shrink-0">
         <Link
           to="/dashboard"
           onClick={() => {
diff --git a/ui/src/components/InstanceSidebar.tsx b/ui/src/components/InstanceSidebar.tsx
index 6a1d0add..f797c0eb 100644
--- a/ui/src/components/InstanceSidebar.tsx
+++ b/ui/src/components/InstanceSidebar.tsx
@@ -5,6 +5,7 @@ import { pluginsApi } from "@/api/plugins";
 import { queryKeys } from "@/lib/queryKeys";
 import { SIDEBAR_SCROLL_RESET_STATE } from "@/lib/navigation-scroll";
 import { SidebarNavItem } from "./SidebarNavItem";
+import { SidebarCompanyMenu } from "./SidebarCompanyMenu";
 
 export function InstanceSidebar() {
   const { data: plugins } = useQuery({
@@ -14,11 +15,12 @@ export function InstanceSidebar() {
 
   return (
     <aside className="w-60 h-full min-h-0 border-r border-border bg-background flex flex-col">
-      <div className="flex items-center gap-2 px-3 h-12 shrink-0">
-        <Settings className="h-4 w-4 text-muted-foreground shrink-0 ml-1" />
-        <span className="flex-1 text-sm font-bold text-foreground truncate">
-          Instance Settings
-        </span>
+      <div className="flex items-center gap-1 px-3 h-12 shrink-0">
+        <SidebarCompanyMenu />
+      </div>
+      <div className="flex items-center gap-2 px-5 pb-3 shrink-0">
+        <Settings className="h-4 w-4 text-muted-foreground shrink-0" />
+        <span className="flex-1 truncate text-sm font-bold text-foreground">Instance Settings</span>
       </div>
 
       <nav className="flex-1 min-h-0 overflow-y-auto scrollbar-auto-hide flex flex-col gap-4 px-3 py-2">
diff --git a/ui/src/components/Layout.tsx b/ui/src/components/Layout.tsx
index 9ad6a822..9c260f6a 100644
--- a/ui/src/components/Layout.tsx
+++ b/ui/src/components/Layout.tsx
@@ -1,7 +1,6 @@
 import { useCallback, useEffect, useMemo, useRef, useState } from "react";
 import { useQuery } from "@tanstack/react-query";
 import { Outlet, useLocation, useNavigate, useNavigationType, useParams } from "@/lib/router";
-import { CompanyRail } from "./CompanyRail";
 import { Sidebar } from "./Sidebar";
 import { InstanceSidebar } from "./InstanceSidebar";
 import { CompanySettingsSidebar } from "./CompanySettingsSidebar";
@@ -336,7 +335,6 @@ export function Layout() {
             )}
           >
             <div className="flex flex-1 min-h-0 overflow-hidden">
-              <CompanyRail />
               {isInstanceSettingsRoute ? (
                 <InstanceSidebar />
               ) : isCompanySettingsRoute ? (
@@ -354,7 +352,6 @@ export function Layout() {
         ) : (
           <div className="flex h-full flex-col shrink-0">
             <div className="flex flex-1 min-h-0">
-              <CompanyRail />
               <div
                 className={cn(
                   "overflow-hidden transition-[width] duration-100 ease-out",
diff --git a/ui/src/components/SidebarCompanyMenu.test.tsx b/ui/src/components/SidebarCompanyMenu.test.tsx
index a96a0d5c..53bbc5ec 100644
--- a/ui/src/components/SidebarCompanyMenu.test.tsx
+++ b/ui/src/components/SidebarCompanyMenu.test.tsx
@@ -14,7 +14,11 @@ const mockAuthApi = vi.hoisted(() => ({
   updateProfile: vi.fn(),
   signOut: vi.fn(),
 }));
+const mockNavigate = vi.hoisted(() => vi.fn());
+const mockOpenOnboarding = vi.hoisted(() => vi.fn());
+const mockSetSelectedCompanyId = vi.hoisted(() => vi.fn());
 const mockSetSidebarOpen = vi.hoisted(() => vi.fn());
+const mockLocation = vi.hoisted(() => ({ pathname: "/PAP/dashboard" }));
 
 vi.mock("@/api/auth", () => ({
   authApi: mockAuthApi,
@@ -24,18 +28,51 @@ vi.mock("@/lib/router", () => ({
   Link: ({ children, to, ...props }: { children: React.ReactNode; to: string }) => (
     <a href={to} {...props}>{children}</a>
   ),
+  useLocation: () => mockLocation,
+  useNavigate: () => mockNavigate,
 }));
 
 vi.mock("@/context/CompanyContext", () => ({
   useCompany: () => ({
+    companies: [
+      {
+        id: "company-1",
+        issuePrefix: "PAP",
+        name: "Acme Labs",
+        brandColor: "#3366ff",
+        status: "active",
+      },
+      {
+        id: "company-2",
+        issuePrefix: "STR",
+        name: "Strata",
+        brandColor: "#36a269",
+        status: "active",
+      },
+    ],
     selectedCompany: {
       id: "company-1",
+      issuePrefix: "PAP",
       name: "Acme Labs",
       brandColor: "#3366ff",
+      status: "active",
     },
+    setSelectedCompanyId: mockSetSelectedCompanyId,
   }),
 }));
 
+vi.mock("@/context/DialogContext", () => ({
+  useDialogActions: () => ({
+    openOnboarding: mockOpenOnboarding,
+  }),
+}));
+
+vi.mock("./CompanyPatternIcon", () => ({
+  CompanyPatternIcon: ({ companyName }: { companyName: string }) => (
+    <span aria-hidden="true">{companyName.slice(0, 1)}</span>
+  ),
+}));
+
 vi.mock("../context/SidebarContext", () => ({
   useSidebar: () => ({
     isMobile: false,
@@ -68,6 +105,7 @@ describe("SidebarCompanyMenu", () => {
       },
     });
     mockAuthApi.signOut.mockResolvedValue(undefined);
+    mockLocation.pathname = "/PAP/dashboard";
   });
 
   afterEach(() => {
@@ -94,7 +132,7 @@ describe("SidebarCompanyMenu", () => {
 
     expect(container.textContent).toContain("Acme Labs");
 
-    const trigger = container.querySelector('button[aria-label="Open Acme Labs menu"]');
+    const trigger = container.querySelector('button[aria-label="Open Acme Labs workspace switcher"]');
     expect(trigger).not.toBeNull();
 
     await act(async () => {
@@ -103,6 +141,9 @@ describe("SidebarCompanyMenu", () => {
     });
     await flushReact();
 
+    expect(document.body.textContent).toContain("Switch workspace");
+    expect(document.body.textContent).toContain("Strata");
+    expect(document.body.textContent).toContain("Add company...");
     expect(document.body.textContent).toContain("Invite people to Acme Labs");
     expect(document.body.textContent).toContain("Company settings");
     expect(document.body.textContent).toContain("Sign out");
@@ -122,4 +163,47 @@ describe("SidebarCompanyMenu", () => {
       root.unmount();
     });
   });
+
+  it("navigates to the selected workspace dashboard from company-prefixed routes", async () => {
+    mockLocation.pathname = "/PAP/issues";
+    const root = createRoot(container);
+    const queryClient = new QueryClient({
+      defaultOptions: { queries: { retry: false } },
+    });
+
+    await act(async () => {
+      root.render(
+        <QueryClientProvider client={queryClient}>
+          <SidebarCompanyMenu />
+        </QueryClientProvider>,
+      );
+    });
+    await flushReact();
+    await flushReact();
+
+    const trigger = container.querySelector('button[aria-label="Open Acme Labs workspace switcher"]');
+    expect(trigger).not.toBeNull();
+
+    await act(async () => {
+      trigger?.dispatchEvent(new PointerEvent("pointerdown", { bubbles: true, button: 0 }));
+      trigger?.dispatchEvent(new MouseEvent("click", { bubbles: true }));
+    });
+    await flushReact();
+
+    const strataItem = Array.from(document.body.querySelectorAll('[data-slot="dropdown-menu-item"]'))
+      .find((element) => element.textContent?.includes("Strata"));
+    expect(strataItem).toBeTruthy();
+
+    await act(async () => {
+      strataItem?.dispatchEvent(new MouseEvent("click", { bubbles: true }));
+    });
+    await flushReact();
+
+    expect(mockSetSelectedCompanyId).toHaveBeenCalledWith("company-2");
+    expect(mockNavigate).toHaveBeenCalledWith("/STR/dashboard");
+
+    await act(async () => {
+      root.unmount();
+    });
+  });
 });
diff --git a/ui/src/components/SidebarCompanyMenu.tsx b/ui/src/components/SidebarCompanyMenu.tsx
index 53d9a58c..cfd39698 100644
--- a/ui/src/components/SidebarCompanyMenu.tsx
+++ b/ui/src/components/SidebarCompanyMenu.tsx
@@ -1,7 +1,8 @@
 import { useState } from "react";
 import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
-import { ChevronDown, LogOut, Settings, UserPlus } from "lucide-react";
-import { Link } from "@/lib/router";
+import { Check, ChevronsUpDown, LogOut, Plus, Settings, UserPlus } from "lucide-react";
+import type { Company } from "@paperclipai/shared";
+import { Link, useLocation, useNavigate } from "@/lib/router";
 import { authApi } from "@/api/auth";
 import { Button } from "@/components/ui/button";
 import {
@@ -13,21 +14,39 @@ import {
   DropdownMenuTrigger,
 } from "@/components/ui/dropdown-menu";
 import { useCompany } from "@/context/CompanyContext";
+import { useDialogActions } from "@/context/DialogContext";
 import { queryKeys } from "@/lib/queryKeys";
+import { cn } from "@/lib/utils";
 import { useSidebar } from "../context/SidebarContext";
+import { CompanyPatternIcon } from "./CompanyPatternIcon";
 
 interface SidebarCompanyMenuProps {
   open?: boolean;
   onOpenChange?: (open: boolean) => void;
 }
 
+function WorkspaceIcon({ company }: { company: Company }) {
+  return (
+    <CompanyPatternIcon
+      companyName={company.name}
+      logoUrl={company.logoUrl}
+      brandColor={company.brandColor}
+      className="size-5 shrink-0 rounded-md text-[11px]"
+    />
+  );
+}
+
 export function SidebarCompanyMenu({ open: controlledOpen, onOpenChange }: SidebarCompanyMenuProps = {}) {
   const [internalOpen, setInternalOpen] = useState(false);
   const queryClient = useQueryClient();
-  const { selectedCompany } = useCompany();
+  const { companies, selectedCompany, setSelectedCompanyId } = useCompany();
+  const { openOnboarding } = useDialogActions();
   const { isMobile, setSidebarOpen } = useSidebar();
+  const location = useLocation();
+  const navigate = useNavigate();
   const open = controlledOpen ?? internalOpen;
   const setOpen = onOpenChange ?? setInternalOpen;
+  const sidebarCompanies = companies.filter((company) => company.status !== "archived");
   const { data: session } = useQuery({
     queryKey: queryKeys.auth.session,
     queryFn: () => authApi.getSession(),
@@ -48,33 +67,76 @@ export function SidebarCompanyMenu({ open: controlledOpen, onOpenChange }: Sideb
     if (isMobile) setSidebarOpen(false);
   }
 
+  function selectCompany(company: Company) {
+    const pathPrefix = location.pathname.split("/")[1]?.toUpperCase();
+    const isCompanyRoute = sidebarCompanies.some((sidebarCompany) => (
+      sidebarCompany.issuePrefix.toUpperCase() === pathPrefix
+    ));
+    const shouldLeaveCurrentRoute = company.id !== selectedCompany?.id
+      && (location.pathname.startsWith("/instance/") || isCompanyRoute);
+
+    setSelectedCompanyId(company.id);
+    setOpen(false);
+    if (isMobile) setSidebarOpen(false);
+    if (shouldLeaveCurrentRoute) {
+      navigate(`/${company.issuePrefix}/dashboard`);
+    }
+  }
+
+  function addCompany() {
+    setOpen(false);
+    if (isMobile) setSidebarOpen(false);
+    openOnboarding();
+  }
+
   return (
     <DropdownMenu open={open} onOpenChange={setOpen}>
       <DropdownMenuTrigger asChild>
         <Button
           variant="ghost"
-          className="h-auto flex-1 justify-start gap-1 px-2 py-1.5 text-left"
-          aria-label={selectedCompany ? `Open ${selectedCompany.name} menu` : "Open company menu"}
-          disabled={!selectedCompany}
+          className="h-9 flex-1 justify-start gap-2 px-2 text-left"
+          aria-label={selectedCompany ? `Open ${selectedCompany.name} workspace switcher` : "Open workspace switcher"}
         >
           <span className="flex min-w-0 flex-1 items-center gap-2">
-            {selectedCompany?.brandColor ? (
-              <span
-                className="size-4 shrink-0 rounded-sm"
-                style={{ backgroundColor: selectedCompany.brandColor }}
-              />
-            ) : null}
+            {selectedCompany ? <WorkspaceIcon company={selectedCompany} /> : null}
             <span className="truncate text-sm font-bold text-foreground">
-              {selectedCompany?.name ?? "Select company"}
+              {selectedCompany?.name ?? "Select workspace"}
             </span>
           </span>
-          <ChevronDown className="size-4 shrink-0 text-muted-foreground" />
+          <ChevronsUpDown className="size-3.5 shrink-0 text-muted-foreground" />
         </Button>
       </DropdownMenuTrigger>
-      <DropdownMenuContent align="start" className="w-64">
-        <DropdownMenuLabel className="truncate">
-          {selectedCompany?.name ?? "Company"}
+      <DropdownMenuContent align="start" sideOffset={8} className="w-64 p-1">
+        <DropdownMenuLabel className="px-2 py-1.5 text-[11px] font-semibold uppercase text-muted-foreground">
+          Switch workspace
         </DropdownMenuLabel>
+        <div className="max-h-72 overflow-y-auto">
+          {sidebarCompanies.map((company) => {
+            const isSelected = company.id === selectedCompany?.id;
+            return (
+              <DropdownMenuItem
+                key={company.id}
+                onClick={() => selectCompany(company)}
+                className={cn(
+                  "min-w-0 gap-2 py-2",
+                  isSelected && "bg-accent text-accent-foreground",
+                )}
+              >
+                <WorkspaceIcon company={company} />
+                <span className="min-w-0 flex-1 truncate">{company.name}</span>
+                {isSelected ? <Check className="size-4 text-muted-foreground" /> : null}
+              </DropdownMenuItem>
+            );
+          })}
+          {sidebarCompanies.length === 0 ? (
+            <DropdownMenuItem disabled>No workspaces</DropdownMenuItem>
+          ) : null}
+        </div>
+        <DropdownMenuSeparator />
+        <DropdownMenuItem onClick={addCompany} className="gap-2 py-2 text-muted-foreground">
+          <Plus className="size-4" />
+          <span>Add company...</span>
+        </DropdownMenuItem>
         <DropdownMenuSeparator />
         <DropdownMenuItem asChild>
           <Link to="/company/settings/invites" onClick={closeNavigationChrome}>