diff --git a/modules/boersenchecker/assets/boersenchecker.css b/modules/boersenchecker/assets/boersenchecker.css
index 11b4994..4ad556d 100644
--- a/modules/boersenchecker/assets/boersenchecker.css
+++ b/modules/boersenchecker/assets/boersenchecker.css
@@ -1,3 +1,30 @@
+.bc-module-nav {
+  display: flex;
+  gap: 10px;
+  flex-wrap: wrap;
+  margin-bottom: 1rem;
+}
+
+.bc-module-tab {
+  display: inline-flex;
+  align-items: center;
+  padding: 10px 14px;
+  border-radius: 999px;
+  text-decoration: none;
+  color: var(--text);
+  border: 1px solid rgba(255,255,255,0.08);
+  background: rgba(255,255,255,0.04);
+  transition: transform .18s ease, background .18s ease, border-color .18s ease;
+}
+
+.bc-module-tab:hover,
+.bc-module-tab:focus-visible,
+.bc-module-tab.is-active {
+  transform: translateY(-1px);
+  background: rgba(71, 169, 255, 0.12);
+  border-color: rgba(71, 169, 255, 0.32);
+}
+
 .bc-hero {
   background:
     radial-gradient(circle at top right, rgba(71, 169, 255, 0.22), transparent 32%),
@@ -19,11 +46,18 @@
   grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
 }
 
+.bc-overview-grid {
+  display: grid;
+  gap: 14px;
+  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
+}
+
 .bc-stat {
   padding: 16px;
   border-radius: 18px;
   background: linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.02));
   border: 1px solid rgba(255,255,255,0.08);
+  box-shadow: inset 0 1px 0 rgba(255,255,255,0.04);
 }
 
 .bc-stat-value {
@@ -109,7 +143,7 @@
 
 .bc-position-row {
   display: grid;
-  grid-template-columns: minmax(0, 1.6fr) repeat(3, minmax(100px, .8fr));
+  grid-template-columns: minmax(0, 1.8fr) repeat(4, minmax(100px, .75fr));
   gap: 12px;
   align-items: center;
   padding: 14px 16px;
@@ -118,6 +152,18 @@
   border: 1px solid rgba(255,255,255,0.06);
 }
 
+.bc-performance {
+  font-weight: 700;
+}
+
+.bc-performance.is-positive {
+  color: #84f2b7;
+}
+
+.bc-performance.is-negative {
+  color: #ff9b8d;
+}
+
 .bc-pill-soft {
   display: inline-flex;
   align-items: center;
diff --git a/modules/boersenchecker/pages/chart_data.php b/modules/boersenchecker/pages/chart_data.php
index 334a3bc..04ac1f4 100644
--- a/modules/boersenchecker/pages/chart_data.php
+++ b/modules/boersenchecker/pages/chart_data.php
@@ -4,12 +4,7 @@ declare(strict_types=1);
 require_auth();
 
 $user = auth_user() ?? [];
-$isAdmin = auth_is_admin();
 $ownerSub = trim((string) ($user['sub'] ?? 'local'));
-$requestedOwner = trim((string) ($_GET['owner_sub'] ?? ''));
-if ($isAdmin && $requestedOwner !== '') {
-    $ownerSub = $requestedOwner;
-}
 
 $instrumentId = (int) ($_GET['instrument_id'] ?? 0);
 if ($instrumentId <= 0) {
diff --git a/modules/boersenchecker/partials/dashboard.php b/modules/boersenchecker/partials/dashboard.php
index 20b0814..989165f 100644
--- a/modules/boersenchecker/partials/dashboard.php
+++ b/modules/boersenchecker/partials/dashboard.php
@@ -1,5 +1,10 @@
 <?php $ownerQuery = $isAdmin ? '?owner_sub=' . urlencode((string) $ownerSub) : ''; ?>
 <div class="card">
+  <div class="bc-module-nav">
+    <a class="bc-module-tab" href="/module/boersenchecker">Startseite</a>
+    <a class="bc-module-tab is-active" href="/module/boersenchecker/depotverwaltung">Depotverwaltung</a>
+    <a class="bc-module-tab" href="/module/boersenchecker/aktienverwaltung">Aktienverwaltung</a>
+  </div>
   <div class="pill">Boersenchecker</div>
   <h1 style="margin-top:.75rem;">Depotverwaltung</h1>
   <p class="muted">
diff --git a/modules/boersenchecker/partials/home.php b/modules/boersenchecker/partials/home.php
index 4329dc0..ce26efa 100644
--- a/modules/boersenchecker/partials/home.php
+++ b/modules/boersenchecker/partials/home.php
@@ -1,4 +1,9 @@
 <div class="card bc-hero" data-bc-home data-chart-endpoint="<?= e($chartEndpoint) ?>">
+  <div class="bc-module-nav">
+    <a class="bc-module-tab is-active" href="/module/boersenchecker">Startseite</a>
+    <a class="bc-module-tab" href="/module/boersenchecker/depotverwaltung">Depotverwaltung</a>
+    <a class="bc-module-tab" href="/module/boersenchecker/aktienverwaltung">Aktienverwaltung</a>
+  </div>
   <script type="application/json" data-bc-instruments-json><?= json_encode(array_map(static function (array $position): array {
       return [
           'instrument_id' => (int) ($position['instrument_id'] ?? 0),
@@ -18,23 +23,7 @@
   <?php endif; ?>
 
   <div class="bc-toolbar" style="margin-top:1rem;">
-    <?php if ($isAdmin): ?>
-      <form class="bc-surface" method="get">
-        <strong>Benutzer</strong>
-        <label class="setup-field muted" style="margin-top:.75rem;">
-          <span>Scope</span>
-          <select name="owner_sub">
-            <?php foreach ($availableOwners as $owner): ?>
-              <option value="<?= e((string) $owner['sub']) ?>" <?= (string) $ownerSub === (string) $owner['sub'] ? 'selected' : '' ?>><?= e((string) $owner['label']) ?></option>
-            <?php endforeach; ?>
-          </select>
-        </label>
-        <button class="cta-button" type="submit">Anzeigen</button>
-      </form>
-    <?php endif; ?>
-
     <form class="bc-surface" method="get">
-      <?php if ($isAdmin): ?><input type="hidden" name="owner_sub" value="<?= e((string) $ownerSub) ?>"><?php endif; ?>
       <strong>Depot</strong>
       <?php if ($portfolios === []): ?>
         <div class="muted" style="margin-top:.75rem;">Keine Depots vorhanden.</div>
@@ -53,7 +42,6 @@
     </form>
 
     <form class="bc-surface" method="get">
-      <?php if ($isAdmin): ?><input type="hidden" name="owner_sub" value="<?= e((string) $ownerSub) ?>"><?php endif; ?>
       <input type="hidden" name="portfolio_id" value="<?= e((string) $selectedPortfolioId) ?>">
       <strong>Aktie</strong>
       <?php if ($positions === []): ?>
@@ -75,15 +63,55 @@
     <form class="bc-surface" method="post">
       <input type="hidden" name="action" value="refresh_current_quotes_home">
       <input type="hidden" name="portfolio_id" value="<?= e((string) $selectedPortfolioId) ?>">
-      <input type="hidden" name="owner_sub" value="<?= e((string) $ownerSub) ?>">
       <strong>Aktuelle Kurse</strong>
       <p class="muted" style="margin:.75rem 0 1rem;">Abruf der aktuellen Kurse fuer das gewaehlte Depot.</p>
       <button class="cta-button" type="submit" <?= $selectedPortfolioId > 0 ? '' : 'disabled' ?>>Aktuelle Kurse abrufen</button>
     </form>
   </div>
 
+  <div class="bc-overview-grid" style="margin-top:1rem;">
+    <div class="bc-stat">
+      <div class="muted">Positionen</div>
+      <div class="bc-stat-value"><?= e((string) ($summary['positions'] ?? 0)) ?></div>
+      <div class="muted" style="margin-top:6px;">Aktien im aktuell gewaehlten Depot</div>
+    </div>
+    <div class="bc-stat">
+      <div class="muted">Investiert</div>
+      <div class="bc-stat-value"><?= isset($summary['invested']) && $summary['invested'] !== null ? e(number_format((float) $summary['invested'], 2, ',', '.')) . ' ' . e($defaultReportCurrency) : 'n/a' ?></div>
+      <div class="muted" style="margin-top:6px;">Auf Berichtswahrung umgerechnet</div>
+    </div>
+    <div class="bc-stat">
+      <div class="muted">Aktueller Wert</div>
+      <div class="bc-stat-value"><?= isset($summary['current']) && $summary['current'] !== null ? e(number_format((float) $summary['current'], 2, ',', '.')) . ' ' . e($defaultReportCurrency) : 'n/a' ?></div>
+      <div class="muted" style="margin-top:6px;">Basierend auf letztem verfuegbarem Kurs</div>
+    </div>
+    <div class="bc-stat">
+      <div class="muted">Performance</div>
+      <div class="bc-stat-value"><?= isset($summary['gain']) && $summary['gain'] !== null ? e(number_format((float) $summary['gain'], 2, ',', '.')) . ' ' . e($defaultReportCurrency) : 'n/a' ?></div>
+      <div class="muted" style="margin-top:6px;"><?= !empty($summary['best']['instrument_name']) ? 'Top: ' . e((string) $summary['best']['instrument_name']) : 'Noch keine Vergleichsdaten' ?></div>
+    </div>
+  </div>
+
   <div class="bc-card-grid" style="margin-top:1rem;">
-    <?php foreach (array_slice($positions, 0, 4) as $position): ?>
+    <div class="bc-surface">
+      <div class="muted">Bester Wert</div>
+      <?php if (!empty($summary['best'])): ?>
+        <div class="bc-stat-value"><?= e((string) $summary['best']['instrument_name']) ?></div>
+        <div class="bc-pill-soft" style="margin-top:.75rem;"><?= e(number_format((float) ($summary['best']['gain_percent'] ?? 0), 2, ',', '.')) ?>%</div>
+      <?php else: ?>
+        <div class="muted" style="margin-top:.75rem;">Noch keine Performance verfuegbar.</div>
+      <?php endif; ?>
+    </div>
+    <div class="bc-surface">
+      <div class="muted">Schwaechster Wert</div>
+      <?php if (!empty($summary['worst'])): ?>
+        <div class="bc-stat-value"><?= e((string) $summary['worst']['instrument_name']) ?></div>
+        <div class="bc-pill-soft" style="margin-top:.75rem;"><?= e(number_format((float) ($summary['worst']['gain_percent'] ?? 0), 2, ',', '.')) ?>%</div>
+      <?php else: ?>
+        <div class="muted" style="margin-top:.75rem;">Noch keine Performance verfuegbar.</div>
+      <?php endif; ?>
+    </div>
+    <?php foreach (array_slice($positions, 0, 2) as $position): ?>
       <div class="bc-stat">
         <div class="muted"><?= e((string) $position['instrument_name']) ?></div>
         <div class="bc-stat-value"><?= $position['latest_price'] !== null ? e(number_format((float) $position['latest_price'], 2, ',', '.')) . ' ' . e((string) $position['latest_currency']) : 'n/a' ?></div>
@@ -122,10 +150,14 @@
     <?php else: ?>
       <div class="bc-position-list" style="margin-top:1rem;">
         <?php foreach ($positions as $position): ?>
+          <?php $gainClass = (($position['gain_report'] ?? 0) >= 0) ? 'is-positive' : 'is-negative'; ?>
           <div class="bc-position-row">
             <div>
               <strong><?= e((string) $position['instrument_name']) ?></strong>
               <div class="muted"><?= e((string) ($position['symbol'] ?? '')) ?> · <?= e((string) ($position['isin'] ?? '-')) ?></div>
+              <?php if (!empty($position['market'])): ?>
+                <div class="bc-pill-soft" style="margin-top:.55rem;"><?= e((string) $position['market']) ?></div>
+              <?php endif; ?>
             </div>
             <div>
               <div class="muted">Stueckzahl</div>
@@ -139,6 +171,12 @@
               <div class="muted">Letzter Kurs</div>
               <div><?= $position['latest_price'] !== null ? e(number_format((float) $position['latest_price'], 2, ',', '.')) . ' ' . e((string) $position['latest_currency']) : 'n/a' ?></div>
             </div>
+            <div>
+              <div class="muted">Performance</div>
+              <div class="bc-performance <?= e($gainClass) ?>">
+                <?= isset($position['gain_report']) && $position['gain_report'] !== null ? e(number_format((float) $position['gain_report'], 2, ',', '.')) . ' ' . e($defaultReportCurrency) : 'n/a' ?>
+              </div>
+            </div>
           </div>
         <?php endforeach; ?>
       </div>
diff --git a/modules/boersenchecker/partials/instruments.php b/modules/boersenchecker/partials/instruments.php
index a734d17..f2704f2 100644
--- a/modules/boersenchecker/partials/instruments.php
+++ b/modules/boersenchecker/partials/instruments.php
@@ -1,8 +1,12 @@
-<?php $ownerQuery = $isAdmin ? '?owner_sub=' . urlencode((string) $ownerSub) : ''; ?>
 <div class="card">
+  <div class="bc-module-nav">
+    <a class="bc-module-tab" href="/module/boersenchecker">Startseite</a>
+    <a class="bc-module-tab" href="/module/boersenchecker/depotverwaltung">Depotverwaltung</a>
+    <a class="bc-module-tab is-active" href="/module/boersenchecker/aktienverwaltung">Aktienverwaltung</a>
+  </div>
   <div class="pill">Boersenchecker</div>
   <h1 style="margin-top:.75rem;">Aktienverwaltung</h1>
-  <p class="muted">Aktien aller Depots des ausgewaehlten Benutzers bearbeiten und manuelle Kurse pflegen.</p>
+  <p class="muted">Aktien aus deinen Depots bearbeiten und manuelle Kurse pflegen.</p>
 
   <?php if ($error): ?>
     <div class="card" style="margin-top:1rem; border-color:#ffb4a8; background:#fff5f3; color:#7a2114;"><?= e($error) ?></div>
@@ -10,28 +14,10 @@
     <div class="card" style="margin-top:1rem; border-color:var(--accent-2);"><?= e($notice) ?></div>
   <?php endif; ?>
 
-  <?php if ($isAdmin): ?>
-    <div class="card" style="margin-top:1rem; background:var(--panel-2);">
-      <strong>Benutzer-Scope</strong>
-      <form method="get" style="margin-top:.75rem; display:flex; gap:10px; flex-wrap:wrap; align-items:end;">
-        <label class="setup-field muted" style="margin:0; min-width:260px;">
-          <span>Benutzer</span>
-          <select name="owner_sub">
-            <?php foreach ($availableOwners as $owner): ?>
-              <option value="<?= e((string) $owner['sub']) ?>" <?= (string) $ownerSub === (string) $owner['sub'] ? 'selected' : '' ?>><?= e((string) $owner['label']) ?></option>
-            <?php endforeach; ?>
-          </select>
-        </label>
-        <button class="cta-button" type="submit">Anzeigen</button>
-      </form>
-    </div>
-  <?php endif; ?>
-
   <div class="grid" style="margin-top:1rem;">
     <div class="card" style="background:var(--panel-2);">
       <strong>Aktie waehlen</strong>
       <form method="get" style="margin-top:.75rem;">
-        <?php if ($isAdmin): ?><input type="hidden" name="owner_sub" value="<?= e((string) $ownerSub) ?>"><?php endif; ?>
         <label class="setup-field muted">
           <span>Aktien aller Depots</span>
           <select name="instrument_id" onchange="this.form.submit()">
@@ -49,7 +35,6 @@
       <strong>Symbolsuche</strong>
       <form method="post" style="margin-top:.75rem; display:flex; gap:10px; flex-wrap:wrap; align-items:end;">
         <input type="hidden" name="action" value="search_symbol">
-        <input type="hidden" name="owner_sub" value="<?= e((string) $ownerSub) ?>">
         <input type="hidden" name="instrument_id" value="<?= e((string) $selectedInstrumentId) ?>">
         <label class="setup-field muted" style="margin:0; min-width:260px; flex:1;">
           <span>Suchbegriff</span>
@@ -68,7 +53,7 @@
                   <td style="padding:8px;"><?= e((string) ($result['region'] ?? '')) ?></td>
                   <td style="padding:8px;"><?= e((string) ($result['currency'] ?? '')) ?></td>
                   <td style="padding:8px;">
-                    <a class="nav-link" href="/module/boersenchecker/aktienverwaltung?owner_sub=<?= urlencode((string) $ownerSub) ?>&instrument_id=<?= e((string) $selectedInstrumentId) ?>&symbol_candidate=<?= urlencode((string) ($result['symbol'] ?? '')) ?>&instrument_name_candidate=<?= urlencode((string) ($result['name'] ?? '')) ?>&market_candidate=<?= urlencode((string) ($result['region'] ?? '')) ?>&quote_currency_candidate=<?= urlencode((string) ($result['currency'] ?? '')) ?>">
+                    <a class="nav-link" href="/module/boersenchecker/aktienverwaltung?instrument_id=<?= e((string) $selectedInstrumentId) ?>&symbol_candidate=<?= urlencode((string) ($result['symbol'] ?? '')) ?>&instrument_name_candidate=<?= urlencode((string) ($result['name'] ?? '')) ?>&market_candidate=<?= urlencode((string) ($result['region'] ?? '')) ?>&quote_currency_candidate=<?= urlencode((string) ($result['currency'] ?? '')) ?>">
                       Uebernehmen
                     </a>
                   </td>
@@ -88,7 +73,6 @@
     <?php else: ?>
       <form method="post" style="margin-top:.75rem; display:grid; gap:10px;">
         <input type="hidden" name="action" value="save_instrument">
-        <input type="hidden" name="owner_sub" value="<?= e((string) $ownerSub) ?>">
         <input type="hidden" name="instrument_id" value="<?= e((string) ($selectedInstrument['id'] ?? 0)) ?>">
         <div class="grid" style="grid-template-columns:repeat(auto-fit, minmax(180px, 1fr)); gap:10px;">
           <label class="setup-field muted"><span>Name</span><input type="text" name="instrument_name" value="<?= e((string) (($selectedInstrument['name'] ?? '') ?: ($_GET['instrument_name_candidate'] ?? ''))) ?>" required></label>
@@ -102,7 +86,6 @@
       </form>
       <form method="post" style="margin-top:.75rem;">
         <input type="hidden" name="action" value="refresh_alpha_vantage_instrument">
-        <input type="hidden" name="owner_sub" value="<?= e((string) $ownerSub) ?>">
         <input type="hidden" name="instrument_id" value="<?= e((string) ($selectedInstrument['id'] ?? 0)) ?>">
         <button class="nav-link" type="submit">Aktuellen API-Kurs abrufen</button>
       </form>
@@ -116,7 +99,6 @@
     <?php else: ?>
       <form method="post" style="margin-top:.75rem; display:grid; gap:10px;">
         <input type="hidden" name="action" value="save_quote">
-        <input type="hidden" name="owner_sub" value="<?= e((string) $ownerSub) ?>">
         <input type="hidden" name="instrument_id" value="<?= e((string) ($selectedInstrument['id'] ?? 0)) ?>">
         <div class="grid" style="grid-template-columns:repeat(auto-fit, minmax(180px, 1fr)); gap:10px;">
           <label class="setup-field muted"><span>Kurs</span><input type="number" name="quote_price" min="0" step="0.00000001" required></label>
@@ -145,7 +127,6 @@
                 <td style="padding:8px;">
                   <form method="post" onsubmit="return confirm('Kurseintrag wirklich loeschen?')">
                     <input type="hidden" name="action" value="delete_quote">
-                    <input type="hidden" name="owner_sub" value="<?= e((string) $ownerSub) ?>">
                     <input type="hidden" name="instrument_id" value="<?= e((string) $selectedInstrumentId) ?>">
                     <input type="hidden" name="quote_id" value="<?= e((string) $quote['id']) ?>">
                     <button class="nav-link" type="submit">Loeschen</button>
diff --git a/modules/boersenchecker/src/Support/HomePage.php b/modules/boersenchecker/src/Support/HomePage.php
index 3691966..b614043 100644
--- a/modules/boersenchecker/src/Support/HomePage.php
+++ b/modules/boersenchecker/src/Support/HomePage.php
@@ -9,10 +9,7 @@ use RuntimeException;
 final class HomePage
 {
     private PDO $pdo;
-    private array $user;
-    private bool $isAdmin;
     private string $ownerSub;
-    private array $availableOwners = [];
     private string $portfolioTable;
     private string $instrumentTable;
     private string $positionTable;
@@ -24,16 +21,8 @@ final class HomePage
     {
         $this->pdo = \module_fn('boersenchecker', 'pdo');
         \module_fn('boersenchecker', 'ensure_schema');
-        $this->user = \auth_user() ?? [];
-        $this->isAdmin = \auth_is_admin();
-        $this->ownerSub = trim((string) ($this->user['sub'] ?? 'local'));
-        $this->availableOwners = $this->buildAvailableOwners();
-        if ($this->isAdmin) {
-            $requestedOwner = trim((string) ($_GET['owner_sub'] ?? $_POST['owner_sub'] ?? ''));
-            if ($requestedOwner !== '' && isset($this->availableOwners[$requestedOwner])) {
-                $this->ownerSub = $requestedOwner;
-            }
-        }
+        $user = \auth_user() ?? [];
+        $this->ownerSub = trim((string) ($user['sub'] ?? 'local'));
 
         $settings = \modules()->settings('boersenchecker');
         $this->defaultReportCurrency = strtoupper(trim((string) ($settings['report_currency'] ?? 'EUR'))) ?: 'EUR';
@@ -79,6 +68,24 @@ final class HomePage
             $position['latest_price'] = is_array($latestQuote) && is_numeric($latestQuote['price'] ?? null) ? (float) $latestQuote['price'] : null;
             $position['latest_currency'] = is_array($latestQuote) ? (string) ($latestQuote['currency'] ?? '') : '';
             $position['latest_quoted_at'] = is_array($latestQuote) ? (string) ($latestQuote['quoted_at'] ?? '') : '';
+            $position['current_total_report'] = null;
+            $position['gain_report'] = null;
+            $position['gain_percent'] = null;
+            if ($position['latest_price'] !== null) {
+                $currentNative = (float) $position['latest_price'] * (float) ($position['quantity'] ?? 0);
+                $currentReport = $this->convertAmount(
+                    $currentNative,
+                    (string) ($position['latest_currency'] ?: ($position['quote_currency'] ?? $this->defaultReportCurrency)),
+                    $this->defaultReportCurrency
+                );
+                $position['current_total_report'] = $currentReport;
+                if ($position['purchase_total_report'] !== null && $currentReport !== null) {
+                    $gain = $currentReport - (float) $position['purchase_total_report'];
+                    $position['gain_report'] = $gain;
+                    $base = (float) $position['purchase_total_report'];
+                    $position['gain_percent'] = $base > 0 ? ($gain / $base) * 100 : null;
+                }
+            }
         }
         unset($position);
 
@@ -93,15 +100,14 @@ final class HomePage
         return [
             'notice' => $notice,
             'error' => $error,
-            'isAdmin' => $this->isAdmin,
-            'ownerSub' => $this->ownerSub,
-            'availableOwners' => array_values($this->availableOwners),
             'portfolios' => $portfolios,
             'selectedPortfolioId' => $selectedPortfolioId,
             'positions' => $positions,
             'selectedInstrumentId' => $selectedInstrumentId,
             'selectedInstrument' => $selectedInstrument,
-            'chartEndpoint' => '/module/boersenchecker/chart_data?owner_sub=' . urlencode($this->ownerSub),
+            'summary' => $this->buildSummary($positions),
+            'defaultReportCurrency' => $this->defaultReportCurrency,
+            'chartEndpoint' => '/module/boersenchecker/chart_data',
         ];
     }
 
@@ -184,7 +190,21 @@ final class HomePage
             'owner_sub' => $this->ownerSub,
             'portfolio_id' => $portfolioId,
         ]);
-        return $stmt->fetchAll(PDO::FETCH_ASSOC) ?: [];
+        $rows = $stmt->fetchAll(PDO::FETCH_ASSOC) ?: [];
+        foreach ($rows as &$row) {
+            $quantity = (float) ($row['quantity'] ?? 0);
+            $purchasePrice = (float) ($row['purchase_price'] ?? 0);
+            $fees = is_numeric($row['fees'] ?? null) ? (float) $row['fees'] : 0.0;
+            $purchaseTotal = ($quantity * $purchasePrice) + $fees;
+            $row['purchase_total'] = $purchaseTotal;
+            $row['purchase_total_report'] = $this->convertAmount(
+                $purchaseTotal,
+                (string) ($row['purchase_currency'] ?? $this->defaultReportCurrency),
+                $this->defaultReportCurrency
+            );
+        }
+        unset($row);
+        return $rows;
     }
 
     private function fetchLatestQuotes(array $instrumentIds): array
@@ -227,26 +247,66 @@ final class HomePage
         return is_array($row) ? $row : null;
     }
 
-    private function buildAvailableOwners(): array
+    private function buildSummary(array $positions): array
     {
-        $owners = [];
-        $currentSub = trim((string) ($this->user['sub'] ?? 'local'));
-        $owners[$currentSub] = [
-            'sub' => $currentSub,
-            'label' => trim((string) ($this->user['name'] ?? $this->user['email'] ?? $currentSub)) ?: $currentSub,
-        ];
-        if (!$this->isAdmin) {
-            return $owners;
-        }
-        foreach (\modules()->knownAuthUsers() as $knownUser) {
-            $sub = trim((string) ($knownUser['sub'] ?? ''));
-            if ($sub === '') {
-                continue;
+        $invested = 0.0;
+        $current = 0.0;
+        $hasInvested = false;
+        $hasCurrent = false;
+        $best = null;
+        $worst = null;
+
+        foreach ($positions as $position) {
+            if (is_numeric($position['purchase_total_report'] ?? null)) {
+                $invested += (float) $position['purchase_total_report'];
+                $hasInvested = true;
+            }
+            if (is_numeric($position['current_total_report'] ?? null)) {
+                $current += (float) $position['current_total_report'];
+                $hasCurrent = true;
+            }
+            if (is_numeric($position['gain_percent'] ?? null)) {
+                if ($best === null || (float) $position['gain_percent'] > (float) ($best['gain_percent'] ?? 0)) {
+                    $best = $position;
+                }
+                if ($worst === null || (float) $position['gain_percent'] < (float) ($worst['gain_percent'] ?? 0)) {
+                    $worst = $position;
+                }
             }
-            $label = trim((string) ($knownUser['name'] ?? $knownUser['email'] ?? $knownUser['username'] ?? $sub));
-            $owners[$sub] = ['sub' => $sub, 'label' => $label !== '' ? $label : $sub];
         }
-        uasort($owners, static fn (array $left, array $right): int => strcmp((string) $left['label'], (string) $right['label']));
-        return $owners;
+
+        return [
+            'positions' => count($positions),
+            'invested' => $hasInvested ? $invested : null,
+            'current' => $hasCurrent ? $current : null,
+            'gain' => ($hasInvested && $hasCurrent) ? $current - $invested : null,
+            'best' => $best,
+            'worst' => $worst,
+        ];
+    }
+
+    private function convertAmount(?float $amount, string $from, string $to): ?float
+    {
+        if ($amount === null) {
+            return null;
+        }
+
+        $from = strtoupper(trim($from)) ?: $this->defaultReportCurrency;
+        $to = strtoupper(trim($to)) ?: $this->defaultReportCurrency;
+        if ($from === $to) {
+            return $amount;
+        }
+
+        $fxService = \module_fn('boersenchecker', 'fx_service');
+        if (!$fxService || !method_exists($fxService, 'convert')) {
+            return null;
+        }
+
+        try {
+            $value = $fxService->convert($amount, $from, $to);
+            return is_numeric($value) ? (float) $value : null;
+        } catch (\Throwable) {
+            return null;
+        }
     }
 }
diff --git a/modules/boersenchecker/src/Support/InstrumentPage.php b/modules/boersenchecker/src/Support/InstrumentPage.php
index cdf3e5e..579e7ea 100644
--- a/modules/boersenchecker/src/Support/InstrumentPage.php
+++ b/modules/boersenchecker/src/Support/InstrumentPage.php
@@ -9,10 +9,7 @@ use RuntimeException;
 final class InstrumentPage
 {
     private PDO $pdo;
-    private array $user;
-    private bool $isAdmin;
     private string $ownerSub;
-    private array $availableOwners = [];
     private string $instrumentTable;
     private string $positionTable;
     private string $quoteTable;
@@ -26,16 +23,8 @@ final class InstrumentPage
     {
         $this->pdo = \module_fn('boersenchecker', 'pdo');
         \module_fn('boersenchecker', 'ensure_schema');
-        $this->user = \auth_user() ?? [];
-        $this->isAdmin = \auth_is_admin();
-        $this->ownerSub = trim((string) ($this->user['sub'] ?? 'local'));
-        $this->availableOwners = $this->buildAvailableOwners();
-        if ($this->isAdmin) {
-            $requestedOwner = trim((string) ($_GET['owner_sub'] ?? $_POST['owner_sub'] ?? ''));
-            if ($requestedOwner !== '' && isset($this->availableOwners[$requestedOwner])) {
-                $this->ownerSub = $requestedOwner;
-            }
-        }
+        $user = \auth_user() ?? [];
+        $this->ownerSub = trim((string) ($user['sub'] ?? 'local'));
 
         $settings = \modules()->settings('boersenchecker');
         $this->defaultReportCurrency = strtoupper(trim((string) ($settings['report_currency'] ?? 'EUR'))) ?: 'EUR';
@@ -100,9 +89,6 @@ final class InstrumentPage
         return [
             'notice' => $notice,
             'error' => $error,
-            'isAdmin' => $this->isAdmin,
-            'ownerSub' => $this->ownerSub,
-            'availableOwners' => array_values($this->availableOwners),
             'instruments' => $instruments,
             'selectedInstrument' => $selectedInstrument,
             'selectedInstrumentId' => $selectedInstrumentId,
@@ -261,29 +247,6 @@ final class InstrumentPage
         return (string) ($result['message'] ?? 'Suche abgeschlossen.');
     }
 
-    private function buildAvailableOwners(): array
-    {
-        $owners = [];
-        $currentSub = trim((string) ($this->user['sub'] ?? 'local'));
-        $owners[$currentSub] = [
-            'sub' => $currentSub,
-            'label' => trim((string) ($this->user['name'] ?? $this->user['email'] ?? $currentSub)) ?: $currentSub,
-        ];
-        if (!$this->isAdmin) {
-            return $owners;
-        }
-        foreach (\modules()->knownAuthUsers() as $knownUser) {
-            $sub = trim((string) ($knownUser['sub'] ?? ''));
-            if ($sub === '') {
-                continue;
-            }
-            $label = trim((string) ($knownUser['name'] ?? $knownUser['email'] ?? $knownUser['username'] ?? $sub));
-            $owners[$sub] = ['sub' => $sub, 'label' => $label !== '' ? $label : $sub];
-        }
-        uasort($owners, static fn (array $left, array $right): int => strcmp((string) $left['label'], (string) $right['label']));
-        return $owners;
-    }
-
     private function assertInstrumentAccessible(int $instrumentId): array
     {
         if ($instrumentId <= 0) {
@@ -303,7 +266,7 @@ final class InstrumentPage
         ]);
         $instrument = $stmt->fetch(PDO::FETCH_ASSOC);
         if (!is_array($instrument)) {
-            throw new RuntimeException('Aktie ist in diesem Benutzer-Scope nicht verfuegbar.');
+            throw new RuntimeException('Aktie ist nicht verfuegbar.');
         }
 
         return $instrument;