diff --git a/apps/web/src/app/(portal)/modules/tender-radar/components/FilterPanel.tsx b/apps/web/src/app/(portal)/modules/tender-radar/components/FilterPanel.tsx
index 68507d2..32f1731 100644
--- a/apps/web/src/app/(portal)/modules/tender-radar/components/FilterPanel.tsx
+++ b/apps/web/src/app/(portal)/modules/tender-radar/components/FilterPanel.tsx
@@ -128,6 +128,10 @@ export function FilterPanel() {
   // includeNullValue defaults to true (D-05 Pflichtkriterium) — only an
   // explicit "false" excludes rows without an estimatedValue.
   const includeNullValue = searchParams.get('includeNullValue') !== 'false';
+  // Merklisten-Filter (UI-04, D-10). Default off — only an explicit "true"
+  // restricts the list to this user's favorited tenders (backend derives
+  // the favorite tenderIds from the auth context, never from this param).
+  const favOnly = searchParams.get('favOnly') === 'true';
 
   const setParam = (key: string, value: string | null) => {
     const next = new URLSearchParams(searchParams.toString());
@@ -220,6 +224,19 @@ export function FilterPanel() {
             Nur noch offene
           </label>
         </div>
+
+        <div className="flex items-center gap-2 pb-2">
+          <input
+            id="tr-filter-fav-only"
+            type="checkbox"
+            checked={favOnly}
+            onChange={(e) => setParam('favOnly', e.target.checked ? 'true' : null)}
+            className="h-4 w-4"
+          />
+          <label htmlFor="tr-filter-fav-only" className="text-sm text-foreground">
+            Nur Favoriten/Merkliste
+          </label>
+        </div>
       </div>
 
       <div className="flex flex-wrap items-end gap-4">
diff --git a/apps/web/src/app/(portal)/modules/tender-radar/components/ResultsList.test.tsx b/apps/web/src/app/(portal)/modules/tender-radar/components/ResultsList.test.tsx
index fca6e30..30d176a 100644
--- a/apps/web/src/app/(portal)/modules/tender-radar/components/ResultsList.test.tsx
+++ b/apps/web/src/app/(portal)/modules/tender-radar/components/ResultsList.test.tsx
@@ -1,18 +1,23 @@
-import { cleanup, render, screen, waitFor } from '@testing-library/react';
+import { cleanup, fireEvent, render, screen, waitFor } from '@testing-library/react';
 import { afterEach, describe, expect, it, vi } from 'vitest';
 
 /**
- * ResultsList.test — RED-first (TDD) proof for Task 3 (FILTER-01, UI-01/05).
- * Mirrors the SourceConfigForm.test.tsx pattern: mock the api client
- * module, render, assert via waitFor. next/navigation is mocked because
- * ResultsList reads/writes URL searchParams for filter + sort state
- * (Research: URL-Param-getriebener Client).
+ * ResultsList.test — RED-first (TDD) proof for Task 3 (FILTER-01, UI-01/05)
+ * plus Plan 11-05 (UI-03/04: gelesen/ungelesen + Favorit toggles, batch
+ * triage merge). Mirrors the SourceConfigForm.test.tsx pattern: mock the
+ * api client module, render, assert via waitFor. next/navigation is mocked
+ * because ResultsList reads/writes URL searchParams for filter + sort
+ * state (Research: URL-Param-getriebener Client).
  */
 
 const mockListTenders = vi.fn();
+const mockFetchTriage = vi.fn();
+const mockSetTriage = vi.fn();
 
 vi.mock('@/lib/tender-radar-api', () => ({
   listTenders: (...args: unknown[]) => mockListTenders(...args),
+  fetchTriage: (...args: unknown[]) => mockFetchTriage(...args),
+  setTriage: (...args: unknown[]) => mockSetTriage(...args),
 }));
 
 const mockReplace = vi.fn();
@@ -26,6 +31,8 @@ vi.mock('next/navigation', () => ({
 afterEach(() => {
   cleanup();
   mockListTenders.mockReset();
+  mockFetchTriage.mockReset();
+  mockSetTriage.mockReset();
   mockReplace.mockReset();
   mockSearchParams = new URLSearchParams();
   vi.restoreAllMocks();
@@ -48,6 +55,7 @@ describe('ResultsList', () => {
       page: 1,
       limit: 20,
     });
+    mockFetchTriage.mockResolvedValue([]);
 
     const { ResultsList } = await import('./ResultsList');
     render(<ResultsList />);
@@ -75,6 +83,7 @@ describe('ResultsList', () => {
       page: 1,
       limit: 20,
     });
+    mockFetchTriage.mockResolvedValue([]);
 
     const { ResultsList } = await import('./ResultsList');
     render(<ResultsList />);
@@ -86,6 +95,7 @@ describe('ResultsList', () => {
 
   it('renders an empty-state message when listTenders returns no items', async () => {
     mockListTenders.mockResolvedValue({ items: [], total: 0, page: 1, limit: 20 });
+    mockFetchTriage.mockResolvedValue([]);
 
     const { ResultsList } = await import('./ResultsList');
     render(<ResultsList />);
@@ -95,3 +105,110 @@ describe('ResultsList', () => {
     });
   });
 });
+
+describe('ResultsList — triage (UI-03/04, Plan 11-05: batch-merge + read/favorite toggles)', () => {
+  const oneItem = {
+    items: [
+      {
+        id: 't1',
+        title: 'Sanierung Rathaus',
+        buyerName: 'Stadt Musterhausen',
+        deadlineAt: '2026-09-01T00:00:00.000Z',
+        estimatedValue: '150000.00',
+        publishedAt: '2026-07-01T00:00:00.000Z',
+      },
+    ],
+    total: 1,
+    page: 1,
+    limit: 20,
+  };
+
+  it('batch-fetches triage for the visible ids and merges the returned isRead/isFavorite state in', async () => {
+    mockListTenders.mockResolvedValue(oneItem);
+    mockFetchTriage.mockResolvedValue([
+      { tenderId: 't1', isRead: true, isFavorite: true },
+    ]);
+
+    const { ResultsList } = await import('./ResultsList');
+    render(<ResultsList />);
+
+    await waitFor(() => {
+      expect(mockFetchTriage).toHaveBeenCalledWith(['t1']);
+    });
+    await waitFor(() => {
+      expect(screen.getByRole('button', { name: 'Als ungelesen markieren' })).toBeInTheDocument();
+    });
+    expect(screen.getByRole('button', { name: 'Favorit entfernen' })).toBeInTheDocument();
+  });
+
+  it('clicking the read toggle calls setTriage(tenderId, isRead: true) and flips the button label optimistically', async () => {
+    mockListTenders.mockResolvedValue(oneItem);
+    mockFetchTriage.mockResolvedValue([]);
+    mockSetTriage.mockResolvedValue({ tenderId: 't1', isRead: true, isFavorite: false });
+
+    const { ResultsList } = await import('./ResultsList');
+    render(<ResultsList />);
+
+    const readButton = await screen.findByRole('button', {
+      name: 'Als gelesen markieren',
+    });
+    fireEvent.click(readButton);
+
+    expect(mockSetTriage).toHaveBeenCalledWith({ tenderId: 't1', isRead: true });
+    await waitFor(() => {
+      expect(
+        screen.getByRole('button', { name: 'Als ungelesen markieren' }),
+      ).toBeInTheDocument();
+    });
+  });
+
+  it('clicking the favorite toggle calls setTriage(tenderId, isFavorite: true) and does not trigger the row click (openDetail)', async () => {
+    mockListTenders.mockResolvedValue(oneItem);
+    mockFetchTriage.mockResolvedValue([]);
+    mockSetTriage.mockResolvedValue({ tenderId: 't1', isRead: false, isFavorite: true });
+
+    const { ResultsList } = await import('./ResultsList');
+    render(<ResultsList />);
+
+    const favButton = await screen.findByRole('button', { name: 'Favorit setzen' });
+    fireEvent.click(favButton);
+
+    expect(mockSetTriage).toHaveBeenCalledWith({ tenderId: 't1', isFavorite: true });
+    expect(mockReplace).not.toHaveBeenCalled();
+    await waitFor(() => {
+      expect(screen.getByRole('button', { name: 'Favorit entfernen' })).toBeInTheDocument();
+    });
+  });
+
+  it('reverts the optimistic update when setTriage rejects', async () => {
+    mockListTenders.mockResolvedValue(oneItem);
+    mockFetchTriage.mockResolvedValue([]);
+    mockSetTriage.mockRejectedValue(new Error('network error'));
+
+    const { ResultsList } = await import('./ResultsList');
+    render(<ResultsList />);
+
+    const readButton = await screen.findByRole('button', {
+      name: 'Als gelesen markieren',
+    });
+    fireEvent.click(readButton);
+
+    await waitFor(() => {
+      expect(
+        screen.getByRole('button', { name: 'Als gelesen markieren' }),
+      ).toBeInTheDocument();
+    });
+  });
+
+  it('a failed batch triage fetch does not block rendering the tender list', async () => {
+    mockListTenders.mockResolvedValue(oneItem);
+    mockFetchTriage.mockRejectedValue(new Error('network error'));
+
+    const { ResultsList } = await import('./ResultsList');
+    render(<ResultsList />);
+
+    await waitFor(() => {
+      expect(screen.getByText('Sanierung Rathaus')).toBeInTheDocument();
+    });
+  });
+});
diff --git a/apps/web/src/app/(portal)/modules/tender-radar/components/ResultsList.tsx b/apps/web/src/app/(portal)/modules/tender-radar/components/ResultsList.tsx
index 256c664..10d8445 100644
--- a/apps/web/src/app/(portal)/modules/tender-radar/components/ResultsList.tsx
+++ b/apps/web/src/app/(portal)/modules/tender-radar/components/ResultsList.tsx
@@ -2,7 +2,12 @@
 
 import { useCallback, useEffect, useState } from 'react';
 import { useRouter, useSearchParams } from 'next/navigation';
-import { listTenders, type Tender } from '@/lib/tender-radar-api';
+import {
+  fetchTriage,
+  listTenders,
+  setTriage,
+  type Tender,
+} from '@/lib/tender-radar-api';
 
 /**
  * ResultsList — the Trefferliste replacing the Phase 10 module placeholder
@@ -24,6 +29,12 @@ const SORT_HEADERS: Array<{ key: 'deadline' | 'value' | 'published'; label: stri
 
 const DEFAULT_LIMIT = 20;
 
+/** Per-tenderId triage state merged in from the batch GET /triage fetch. */
+interface TriageState {
+  isRead: boolean;
+  isFavorite: boolean;
+}
+
 function formatDate(value: string | null): string {
   if (!value) return '–';
   const d = new Date(value);
@@ -57,6 +68,12 @@ export function ResultsList() {
   const [page, setPage] = useState(1);
   const [isLoading, setIsLoading] = useState(true);
   const [error, setError] = useState<string | null>(null);
+  // UI-03/04: per-tenderId triage overlay (gelesen/ungelesen, Favorit),
+  // merged in from a batch GET /triage fetch of the visible ids. Keyed by
+  // tenderId, not persisted beyond this component's lifetime — always
+  // re-fetched per page/filter change (D-11: per-user, never trusted from
+  // any other source).
+  const [triage, setTriageMap] = useState<Record<string, TriageState>>({});
 
   const load = useCallback(async () => {
     setIsLoading(true);
@@ -68,6 +85,29 @@ export function ResultsList() {
       setItems(data.items);
       setTotal(data.total);
       setPage(data.page);
+
+      // Batch-merge this user's triage state for the visible ids (UI-03/04,
+      // key_link: "GET /triage batch → merge in ResultsList"). Triage is a
+      // supplementary per-user overlay — a failed batch-load must not block
+      // rendering the tender list itself.
+      const ids = data.items.map((t) => t.id);
+      try {
+        const rows = await fetchTriage(ids);
+        if (Array.isArray(rows)) {
+          setTriageMap((prev) => {
+            const next = { ...prev };
+            for (const row of rows) {
+              next[row.tenderId] = {
+                isRead: row.isRead,
+                isFavorite: row.isFavorite,
+              };
+            }
+            return next;
+          });
+        }
+      } catch {
+        // Swallow — the list itself is not blocked by a triage load failure.
+      }
     } catch (err) {
       setError(
         err instanceof Error
@@ -107,6 +147,45 @@ export function ResultsList() {
     router.replace(`?${next.toString()}`);
   };
 
+  /**
+   * Gelesen/Ungelesen-Toggle (D-09, UI-03). Optimistic update — reverts on
+   * a failed PUT so the UI never claims a state the backend didn't accept.
+   * `stopPropagation` prevents the row's own onClick (openDetail) firing.
+   */
+  const toggleRead = async (e: React.MouseEvent, tender: Tender) => {
+    e.stopPropagation();
+    const previous = triage[tender.id] ?? { isRead: false, isFavorite: false };
+    const nextRead = !previous.isRead;
+    setTriageMap((prev) => ({
+      ...prev,
+      [tender.id]: { ...previous, isRead: nextRead },
+    }));
+    try {
+      await setTriage({ tenderId: tender.id, isRead: nextRead });
+    } catch {
+      setTriageMap((prev) => ({ ...prev, [tender.id]: previous }));
+    }
+  };
+
+  /**
+   * Favorit-Toggle (D-10, UI-04). Same optimistic-with-revert pattern as
+   * toggleRead.
+   */
+  const toggleFavorite = async (e: React.MouseEvent, tender: Tender) => {
+    e.stopPropagation();
+    const previous = triage[tender.id] ?? { isRead: false, isFavorite: false };
+    const nextFavorite = !previous.isFavorite;
+    setTriageMap((prev) => ({
+      ...prev,
+      [tender.id]: { ...previous, isFavorite: nextFavorite },
+    }));
+    try {
+      await setTriage({ tenderId: tender.id, isFavorite: nextFavorite });
+    } catch {
+      setTriageMap((prev) => ({ ...prev, [tender.id]: previous }));
+    }
+  };
+
   const limit = Number(searchParams.get('limit') ?? DEFAULT_LIMIT);
   const totalPages = Math.max(1, Math.ceil(total / limit));
 
@@ -132,13 +211,14 @@ export function ResultsList() {
                 {currentSort === h.key ? ' ▾' : ''}
               </th>
             ))}
+            <th className={thStaticCls}>Triage</th>
           </tr>
         </thead>
         <tbody>
           {isLoading ? (
             Array.from({ length: 5 }).map((_, i) => (
               <tr key={i} className="border-b border-border last:border-0">
-                {Array.from({ length: 5 }).map((_, j) => (
+                {Array.from({ length: 6 }).map((_, j) => (
                   <td key={j} className="px-4 py-3">
                     <div className="h-4 rounded bg-muted animate-pulse" />
                   </td>
@@ -147,13 +227,13 @@ export function ResultsList() {
             ))
           ) : error ? (
             <tr>
-              <td colSpan={5} className="px-4 py-10 text-center text-sm text-destructive">
+              <td colSpan={6} className="px-4 py-10 text-center text-sm text-destructive">
                 {error}
               </td>
             </tr>
           ) : items.length === 0 ? (
             <tr>
-              <td colSpan={5} className="px-4 py-10 text-center">
+              <td colSpan={6} className="px-4 py-10 text-center">
                 <p className="font-medium text-foreground">
                   Keine Ausschreibungen gefunden.
                 </p>
@@ -164,21 +244,73 @@ export function ResultsList() {
               </td>
             </tr>
           ) : (
-            items.map((tender) => (
-              <tr
-                key={tender.id}
-                onClick={() => openDetail(tender.id)}
-                className="cursor-pointer border-b border-border last:border-0 hover:bg-muted/50 transition-colors"
-              >
-                <td className="px-4 py-3 font-medium text-foreground">
-                  {tender.title}
-                </td>
-                <td className="px-4 py-3">{tender.buyerName ?? '–'}</td>
-                <td className="px-4 py-3">{formatDate(tender.deadlineAt)}</td>
-                <td className="px-4 py-3">{formatValue(tender.estimatedValue)}</td>
-                <td className="px-4 py-3">{formatDate(tender.publishedAt)}</td>
-              </tr>
-            ))
+            items.map((tender) => {
+              const rowTriage = triage[tender.id] ?? {
+                isRead: false,
+                isFavorite: false,
+              };
+              return (
+                <tr
+                  key={tender.id}
+                  onClick={() => openDetail(tender.id)}
+                  className={`cursor-pointer border-b border-border last:border-0 hover:bg-muted/50 transition-colors ${
+                    rowTriage.isRead ? 'opacity-60' : ''
+                  }`}
+                >
+                  <td className="px-4 py-3 font-medium text-foreground">
+                    {tender.title}
+                  </td>
+                  <td className="px-4 py-3">{tender.buyerName ?? '–'}</td>
+                  <td className="px-4 py-3">{formatDate(tender.deadlineAt)}</td>
+                  <td className="px-4 py-3">{formatValue(tender.estimatedValue)}</td>
+                  <td className="px-4 py-3">{formatDate(tender.publishedAt)}</td>
+                  <td className="px-4 py-3">
+                    <div className="flex items-center gap-2">
+                      <button
+                        type="button"
+                        onClick={(e) => toggleRead(e, tender)}
+                        aria-pressed={rowTriage.isRead}
+                        aria-label={
+                          rowTriage.isRead
+                            ? 'Als ungelesen markieren'
+                            : 'Als gelesen markieren'
+                        }
+                        title={
+                          rowTriage.isRead
+                            ? 'Als ungelesen markieren'
+                            : 'Als gelesen markieren'
+                        }
+                        className="rounded border border-border px-2 py-1 text-xs text-foreground transition-colors hover:bg-muted"
+                      >
+                        {rowTriage.isRead ? 'Gelesen' : 'Ungelesen'}
+                      </button>
+                      <button
+                        type="button"
+                        onClick={(e) => toggleFavorite(e, tender)}
+                        aria-pressed={rowTriage.isFavorite}
+                        aria-label={
+                          rowTriage.isFavorite
+                            ? 'Favorit entfernen'
+                            : 'Favorit setzen'
+                        }
+                        title={
+                          rowTriage.isFavorite
+                            ? 'Favorit entfernen'
+                            : 'Favorit setzen'
+                        }
+                        className={`rounded border px-2 py-1 text-xs transition-colors hover:bg-muted ${
+                          rowTriage.isFavorite
+                            ? 'border-amber-400 text-amber-500'
+                            : 'border-border text-foreground'
+                        }`}
+                      >
+                        {rowTriage.isFavorite ? '★ Favorit' : '☆ Favorit'}
+                      </button>
+                    </div>
+                  </td>
+                </tr>
+              );
+            })
           )}
         </tbody>
       </table>
diff --git a/apps/web/src/lib/tender-radar-api.ts b/apps/web/src/lib/tender-radar-api.ts
index 9209f1f..04107d9 100644
--- a/apps/web/src/lib/tender-radar-api.ts
+++ b/apps/web/src/lib/tender-radar-api.ts
@@ -151,3 +151,56 @@ export async function getTender(id: string): Promise<Tender> {
   if (!res.ok) throw new Error('Failed to fetch tender detail');
   return res.json();
 }
+
+/**
+ * A single per-user triage row (Plan 11-05, UI-03/04). Per-user, NOT
+ * tenant-wide (D-11) — the backend derives userId from the auth cookie,
+ * this client never sends a userId.
+ */
+export interface TriageEntry {
+  tenderId: string;
+  isRead: boolean;
+  isFavorite: boolean;
+}
+
+/** Payload accepted by PUT /modules/tender-radar/triage. */
+export interface SetTriagePayload {
+  tenderId: string;
+  isRead?: boolean;
+  isFavorite?: boolean;
+}
+
+/**
+ * Batch-fetch this user's triage state (gelesen/ungelesen, Favorit) for a
+ * set of tenderIds (Plan 11-05, UI-03/04) — used by ResultsList to merge
+ * triage state into the visible page in one round-trip.
+ * GET /modules/tender-radar/triage?ids=<csv>
+ */
+export async function fetchTriage(ids: string[]): Promise<TriageEntry[]> {
+  if (!ids.length) return [];
+  const params = new URLSearchParams({ ids: ids.join(',') });
+  const res = await fetch(
+    `${API_URL}/modules/tender-radar/triage?${params}`,
+    { credentials: 'include' },
+  );
+  if (!res.ok) throw new Error('Failed to fetch tender triage');
+  return res.json();
+}
+
+/**
+ * Upsert this user's triage state for one tender (Plan 11-05, UI-03/04).
+ * Idempotent on the backend (@@unique([userId,tenderId])).
+ * PUT /modules/tender-radar/triage
+ */
+export async function setTriage(
+  payload: SetTriagePayload,
+): Promise<TriageEntry> {
+  const res = await fetch(`${API_URL}/modules/tender-radar/triage`, {
+    method: 'PUT',
+    headers: { 'Content-Type': 'application/json' },
+    credentials: 'include',
+    body: JSON.stringify(payload),
+  });
+  if (!res.ok) throw new Error('Failed to save tender triage');
+  return res.json();
+}