diff --git a/frontend/src/hooks/__tests__/useOwnerWeights.test.ts b/frontend/src/hooks/__tests__/useOwnerWeights.test.ts
index bce0eea..25f5a66 100644
--- a/frontend/src/hooks/__tests__/useOwnerWeights.test.ts
+++ b/frontend/src/hooks/__tests__/useOwnerWeights.test.ts
@@ -1,35 +1,122 @@
-import { renderHook, waitFor } from "@testing-library/react";
-import { describe, expect, test } from "vitest";
+import { act, renderHook } from "@testing-library/react";
+import { afterEach, beforeEach, describe, expect, test, vi } from "vitest";
+import * as contract from "../../lib/contract";
 import { useOwnerWeights } from "../useOwnerWeights";
 
+vi.mock("../../lib/contract", () => ({
+  getOwnerWeights: vi.fn(),
+}));
+
+const intervalMs = 5000;
+const initialWeights = [
+  { address: "GOWNER111", weight: 4 },
+  { address: "GOWNER222", weight: 6 },
+];
+const refreshedWeights = [
+  { address: "GOWNER111", weight: 3 },
+  { address: "GOWNER222", weight: 7 },
+];
+
 describe("useOwnerWeights", () => {
-  test("returns no weights for an empty owner list", () => {
-    const { result } = renderHook(() => useOwnerWeights([]));
+  beforeEach(() => {
+    vi.useFakeTimers();
+    vi.clearAllMocks();
+    vi.spyOn(console, "error").mockImplementation(() => undefined);
+  });
+
+  afterEach(() => {
+    vi.useRealTimers();
+    vi.restoreAllMocks();
+  });
+
+  test("fetches owner weights on mount", async () => {
+    vi.mocked(contract.getOwnerWeights).mockResolvedValueOnce(initialWeights);
+
+    const { result } = renderHook(() => useOwnerWeights(intervalMs));
 
     expect(result.current).toEqual({
-      weightsByAddress: {},
-      totalWeight: 0,
-      loading: false,
+      ownerWeights: [],
+      loading: true,
       error: null,
     });
+
+    await vi.waitFor(() => {
+      expect(result.current.loading).toBe(false);
+    });
+
+    expect(contract.getOwnerWeights).toHaveBeenCalledTimes(1);
+    expect(result.current.ownerWeights).toEqual(initialWeights);
+    expect(result.current.error).toBeNull();
   });
 
-  test("loads current flat voting weights for owners", async () => {
-    const ownerAddresses = ["GOWNER111", "GOWNER222"];
+  test("refreshes owner weights on an interval", async () => {
+    vi.mocked(contract.getOwnerWeights)
+      .mockResolvedValueOnce(initialWeights)
+      .mockResolvedValueOnce(refreshedWeights);
+
+    const { result } = renderHook(() => useOwnerWeights(intervalMs));
 
-    const { result } = renderHook(() => useOwnerWeights(ownerAddresses));
+    await vi.waitFor(() => {
+      expect(result.current.ownerWeights).toEqual(initialWeights);
+    });
 
-    expect(result.current.loading).toBe(true);
+    act(() => {
+      vi.advanceTimersByTime(intervalMs);
+    });
 
-    await waitFor(() => {
-      expect(result.current.loading).toBe(false);
+    await vi.waitFor(() => {
+      expect(contract.getOwnerWeights).toHaveBeenCalledTimes(2);
+      expect(result.current.ownerWeights).toEqual(refreshedWeights);
     });
 
+    expect(result.current.loading).toBe(false);
     expect(result.current.error).toBeNull();
-    expect(result.current.totalWeight).toBe(2);
-    expect(result.current.weightsByAddress).toEqual({
-      GOWNER111: 1,
-      GOWNER222: 1,
+  });
+
+  test("keeps cached owner weights when a refresh fails", async () => {
+    const refreshError = new Error("RPC unavailable");
+    vi.mocked(contract.getOwnerWeights)
+      .mockResolvedValueOnce(initialWeights)
+      .mockRejectedValueOnce(refreshError);
+
+    const { result } = renderHook(() => useOwnerWeights(intervalMs));
+
+    await vi.waitFor(() => {
+      expect(result.current.ownerWeights).toEqual(initialWeights);
+    });
+
+    act(() => {
+      vi.advanceTimersByTime(intervalMs);
     });
+
+    await vi.waitFor(() => {
+      expect(contract.getOwnerWeights).toHaveBeenCalledTimes(2);
+      expect(result.current.error).toBe("RPC unavailable");
+    });
+
+    expect(result.current.ownerWeights).toEqual(initialWeights);
+    expect(result.current.loading).toBe(false);
+    expect(console.error).toHaveBeenCalledWith(
+      "Failed to fetch owner weights",
+      refreshError,
+    );
+  });
+
+  test("stops refreshing after unmount", async () => {
+    vi.mocked(contract.getOwnerWeights).mockResolvedValueOnce(initialWeights);
+
+    const { result, unmount } = renderHook(() => useOwnerWeights(intervalMs));
+
+    await vi.waitFor(() => {
+      expect(result.current.ownerWeights).toEqual(initialWeights);
+    });
+
+    unmount();
+
+    act(() => {
+      vi.advanceTimersByTime(intervalMs);
+    });
+
+    expect(contract.getOwnerWeights).toHaveBeenCalledTimes(1);
   });
 });
diff --git a/frontend/src/hooks/useOwnerWeights.ts b/frontend/src/hooks/useOwnerWeights.ts
index 18c2ccf..33188a6 100644
--- a/frontend/src/hooks/useOwnerWeights.ts
+++ b/frontend/src/hooks/useOwnerWeights.ts
@@ -73,6 +73,7 @@ export function useOwnerWeights(ownerAddresses: string[]) {
 
     return () => {
       cancelled = true;
+      clearInterval(intervalId);
     };
   }, [ownerAddresses]);
 
diff --git a/frontend/src/pages/OwnersPage.test.tsx b/frontend/src/pages/OwnersPage.test.tsx
index caa5d5c..ffcc02f 100644
--- a/frontend/src/pages/OwnersPage.test.tsx
+++ b/frontend/src/pages/OwnersPage.test.tsx
@@ -35,18 +35,17 @@ describe("OwnersPage", () => {
 
   test("shows weighted quorum and each owner voting share", () => {
     mockUseOwnerWeights.mockReturnValue({
-      weightsByAddress: {
-        GOWNER111: 5,
-        GOWNER222: 15,
-      },
-      totalWeight: 20,
+      ownerWeights: [
+        { address: "GOWNER111", weight: 5 },
+        { address: "GOWNER222", weight: 15 },
+      ],
       loading: false,
       error: null,
     });
 
     renderOwnersPage();
 
-    expect(mockUseOwnerWeights).toHaveBeenCalledWith(ownerAddresses);
+    expect(mockUseOwnerWeights).toHaveBeenCalledWith();
     expect(screen.getByText("Requires 5 of 20 voting weight")).toBeInTheDocument();
     expect(screen.getByText("25.0% of voting power must approve."))
       .toBeInTheDocument();
@@ -60,8 +59,7 @@ describe("OwnersPage", () => {
 
   test("keeps owners visible while voting weights load", () => {
     mockUseOwnerWeights.mockReturnValue({
-      weightsByAddress: {},
-      totalWeight: 0,
+      ownerWeights: [],
       loading: true,
       error: null,
     });
@@ -79,8 +77,7 @@ describe("OwnersPage", () => {
 
   test("keeps owners visible when voting weights fail to load", () => {
     mockUseOwnerWeights.mockReturnValue({
-      weightsByAddress: {},
-      totalWeight: 0,
+      ownerWeights: [],
       loading: false,
       error: "Failed to load owner weights",
     });
diff --git a/frontend/src/pages/OwnersPage.tsx b/frontend/src/pages/OwnersPage.tsx
index 6468718..5df2936 100644
--- a/frontend/src/pages/OwnersPage.tsx
+++ b/frontend/src/pages/OwnersPage.tsx
@@ -218,11 +218,14 @@ export function OwnersPage({
           <p>
             {ownerWeightsLoading
               ? `Loading voting power across ${ownerCountLabel}...`
-              : ownerWeightsError
+              : weightsUnavailable
                 ? "Voting power unavailable; owners remain visible."
                 : `${quorumPercent} of voting power must approve.`}
           </p>
-          {ownerWeightsError && (
+          {weightsStale && (
+            <p className="text-amber-400">Voting weights may be stale.</p>
+          )}
+          {weightsUnavailable && (
             <p className="text-amber-400">Voting weights unavailable.</p>
           )}
         </div>
diff --git a/frontend/src/types/accord.ts b/frontend/src/types/accord.ts
index 85168f2..ca6c200 100644
--- a/frontend/src/types/accord.ts
+++ b/frontend/src/types/accord.ts
@@ -29,6 +29,11 @@ export type Owner = {
   label: string;
 };
 
+export type OwnerWeight = {
+  address: string;
+  weight: number;
+};
+
 export type DashboardStat = {
   label: string;
   value: string;