diff --git a/src/components/clients/client-columns.tsx b/src/components/clients/client-columns.tsx
index f53e5b1..e940370 100644
--- a/src/components/clients/client-columns.tsx
+++ b/src/components/clients/client-columns.tsx
@@ -18,7 +18,7 @@ import { TagBadge } from '@/components/shared/tag-badge';
 export interface ClientRow {
   id: string;
   fullName: string;
-  companyName: string | null;
+  nationality: string | null;
   source: string | null;
   archivedAt: string | null;
   createdAt: string;
@@ -39,6 +39,10 @@ interface GetColumnsOptions {
   onArchive: (client: ClientRow) => void;
 }
 
+// TODO: Add "Yachts" (count) and "Primary company" columns once the
+// GET /api/v1/clients list endpoint joins owned-yachts and primary-company
+// data into the row shape. Until then, the columns are omitted rather than
+// shown as empty placeholders.
 export function getClientColumns({
   portSlug,
   onEdit,
@@ -59,14 +63,6 @@ export function getClientColumns({
         </Link>
       ),
     },
-    {
-      id: 'companyName',
-      accessorKey: 'companyName',
-      header: 'Company',
-      cell: ({ getValue }) => (
-        <span className="text-muted-foreground">{(getValue() as string | null) ?? '—'}</span>
-      ),
-    },
     {
       id: 'primaryContact',
       header: 'Primary Contact',
@@ -82,6 +78,14 @@ export function getClientColumns({
         );
       },
     },
+    {
+      id: 'nationality',
+      accessorKey: 'nationality',
+      header: 'Nationality',
+      cell: ({ getValue }) => (
+        <span className="text-muted-foreground">{(getValue() as string | null) ?? '—'}</span>
+      ),
+    },
     {
       id: 'source',
       accessorKey: 'source',
@@ -149,10 +153,7 @@ export function getClientColumns({
               <Pencil className="mr-2 h-3.5 w-3.5" />
               Edit
             </DropdownMenuItem>
-            <DropdownMenuItem
-              className="text-destructive"
-              onClick={() => onArchive(row.original)}
-            >
+            <DropdownMenuItem className="text-destructive" onClick={() => onArchive(row.original)}>
               <Archive className="mr-2 h-3.5 w-3.5" />
               Archive
             </DropdownMenuItem>
diff --git a/src/components/clients/client-companies-tab.tsx b/src/components/clients/client-companies-tab.tsx
new file mode 100644
index 0000000..80403dd
--- /dev/null
+++ b/src/components/clients/client-companies-tab.tsx
@@ -0,0 +1,103 @@
+'use client';
+
+import Link from 'next/link';
+import { useParams } from 'next/navigation';
+import { format } from 'date-fns';
+
+import {
+  Table,
+  TableHeader,
+  TableBody,
+  TableCell,
+  TableHead,
+  TableRow,
+} from '@/components/ui/table';
+import { Badge } from '@/components/ui/badge';
+import { EmptyState } from '@/components/shared/empty-state';
+
+interface ClientCompaniesTabProps {
+  clientId: string;
+  companies: Array<{
+    membershipId: string;
+    role: string;
+    isPrimary: boolean;
+    startDate: string | Date;
+    company: {
+      id: string;
+      name: string;
+      legalName: string | null;
+      status: string;
+    };
+  }>;
+}
+
+function formatSince(startDate: string | Date): string {
+  const d = typeof startDate === 'string' ? new Date(startDate) : startDate;
+  if (Number.isNaN(d.getTime())) return '—';
+  return format(d, 'MMM d, yyyy');
+}
+
+export function ClientCompaniesTab({ clientId: _clientId, companies }: ClientCompaniesTabProps) {
+  const routeParams = useParams<{ portSlug: string }>();
+  const portSlug = routeParams?.portSlug ?? '';
+
+  if (companies.length === 0) {
+    return (
+      <EmptyState
+        title="No company memberships"
+        description="This client is not affiliated with any companies yet. Add a membership from a company's detail page."
+      />
+    );
+  }
+
+  return (
+    <div className="space-y-4">
+      <h3 className="text-sm font-medium">Company affiliations</h3>
+      <div className="rounded-md border">
+        <Table>
+          <TableHeader>
+            <TableRow>
+              <TableHead>Company</TableHead>
+              <TableHead>Role</TableHead>
+              <TableHead>Primary</TableHead>
+              <TableHead>Since</TableHead>
+            </TableRow>
+          </TableHeader>
+          <TableBody>
+            {companies.map((m) => (
+              <TableRow key={m.membershipId}>
+                <TableCell>
+                  <Link
+                    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+                    href={`/${portSlug}/companies/${m.company.id}` as any}
+                    className="text-primary hover:underline"
+                  >
+                    {m.company.name}
+                  </Link>
+                  {m.company.legalName && (
+                    <span className="ml-2 text-xs text-muted-foreground">
+                      ({m.company.legalName})
+                    </span>
+                  )}
+                </TableCell>
+                <TableCell className="capitalize">{m.role.replace('_', ' ')}</TableCell>
+                <TableCell>
+                  {m.isPrimary ? (
+                    <Badge variant="secondary" className="text-xs">
+                      Primary
+                    </Badge>
+                  ) : (
+                    <span className="text-muted-foreground">—</span>
+                  )}
+                </TableCell>
+                <TableCell className="text-muted-foreground text-sm">
+                  {formatSince(m.startDate)}
+                </TableCell>
+              </TableRow>
+            ))}
+          </TableBody>
+        </Table>
+      </div>
+    </div>
+  );
+}
diff --git a/src/components/clients/client-detail.tsx b/src/components/clients/client-detail.tsx
index 6e7b178..bb15697 100644
--- a/src/components/clients/client-detail.tsx
+++ b/src/components/clients/client-detail.tsx
@@ -12,19 +12,7 @@ interface ClientData {
   id: string;
   portId: string;
   fullName: string;
-  companyName: string | null;
   nationality: string | null;
-  isProxy: boolean;
-  proxyType: string | null;
-  actualOwnerName: string | null;
-  yachtName: string | null;
-  yachtLengthFt: string | null;
-  yachtWidthFt: string | null;
-  yachtDraftFt: string | null;
-  yachtLengthM: string | null;
-  yachtWidthM: string | null;
-  yachtDraftM: string | null;
-  berthSizeDesired: string | null;
   preferredContactMethod: string | null;
   preferredLanguage: string | null;
   timezone: string | null;
@@ -46,6 +34,35 @@ interface ClientData {
     name: string;
     color: string;
   }>;
+  yachts: Array<{
+    id: string;
+    name: string;
+    hullNumber: string | null;
+    registration: string | null;
+    lengthFt: string | null;
+    widthFt: string | null;
+    status: string;
+  }>;
+  companies: Array<{
+    membershipId: string;
+    role: string;
+    isPrimary: boolean;
+    startDate: string | Date;
+    company: {
+      id: string;
+      name: string;
+      legalName: string | null;
+      status: string;
+    };
+  }>;
+  activeReservations: Array<{
+    id: string;
+    berthId: string;
+    yachtId: string;
+    startDate: string | Date;
+    tenureType: string;
+    status: string;
+  }>;
 }
 
 interface ClientDetailProps {
@@ -64,11 +81,15 @@ export function ClientDetail({ clientId, currentUserId }: ClientDetailProps) {
     'client:updated': [['clients', clientId]],
     'client:archived': [['clients', clientId]],
     'client:restored': [['clients', clientId]],
+    'yacht:ownership_transferred': [['clients', clientId]],
+    'company_membership:added': [['clients', clientId]],
+    'company_membership:ended': [['clients', clientId]],
+    'berth_reservation:activated': [['clients', clientId]],
+    'berth_reservation:ended': [['clients', clientId]],
+    'berth_reservation:cancelled': [['clients', clientId]],
   });
 
-  const tabs = data
-    ? getClientTabs({ clientId, currentUserId, client: data })
-    : [];
+  const tabs = data ? getClientTabs({ clientId, currentUserId, client: data }) : [];
 
   return (
     <DetailLayout
diff --git a/src/components/clients/client-filters.tsx b/src/components/clients/client-filters.tsx
index 4941682..d1d74b9 100644
--- a/src/components/clients/client-filters.tsx
+++ b/src/components/clients/client-filters.tsx
@@ -24,11 +24,6 @@ export const clientFilterDefinitions: FilterDefinition[] = [
     type: 'text',
     placeholder: 'Filter by nationality...',
   },
-  {
-    key: 'isProxy',
-    label: 'Proxy Client',
-    type: 'boolean',
-  },
   {
     key: 'includeArchived',
     label: 'Include Archived',
diff --git a/src/components/clients/client-reservations-tab.tsx b/src/components/clients/client-reservations-tab.tsx
new file mode 100644
index 0000000..f4cb2ef
--- /dev/null
+++ b/src/components/clients/client-reservations-tab.tsx
@@ -0,0 +1,51 @@
+'use client';
+
+import { ReservationList, type ReservationRow } from '@/components/reservations/reservation-list';
+
+interface ClientReservationsTabProps {
+  clientId: string;
+  activeReservations: Array<{
+    id: string;
+    berthId: string;
+    yachtId: string;
+    startDate: string | Date;
+    tenureType: string;
+    status: string;
+  }>;
+}
+
+export function ClientReservationsTab({
+  clientId,
+  activeReservations,
+}: ClientReservationsTabProps) {
+  const rows: ReservationRow[] = activeReservations.map((r) => ({
+    id: r.id,
+    berthId: r.berthId,
+    portId: '', // not rendered by ReservationList
+    clientId,
+    yachtId: r.yachtId,
+    status: r.status as ReservationRow['status'],
+    startDate: typeof r.startDate === 'string' ? r.startDate : r.startDate.toISOString(),
+    endDate: null,
+    tenureType: r.tenureType,
+    contractFileId: null,
+    notes: null,
+    createdAt: '',
+  }));
+
+  return (
+    <div className="space-y-4">
+      <div>
+        <h3 className="text-sm font-medium">Active reservations</h3>
+        <p className="text-xs text-muted-foreground mt-0.5">
+          Showing currently active reservations. History is coming soon.
+        </p>
+      </div>
+      <ReservationList
+        reservations={rows}
+        showBerth
+        emptyMessage="This client has no active reservations."
+      />
+    </div>
+  );
+}
diff --git a/src/components/clients/client-tabs.tsx b/src/components/clients/client-tabs.tsx
index 9c0254b..9537b12 100644
--- a/src/components/clients/client-tabs.tsx
+++ b/src/components/clients/client-tabs.tsx
@@ -2,22 +2,16 @@
 
 import type { DetailTab } from '@/components/shared/detail-layout';
 import { NotesList } from '@/components/shared/notes-list';
+import { ClientYachtsTab } from '@/components/clients/client-yachts-tab';
+import { ClientCompaniesTab } from '@/components/clients/client-companies-tab';
+import { ClientReservationsTab } from '@/components/clients/client-reservations-tab';
 
 interface ClientTabsOptions {
   clientId: string;
   currentUserId?: string;
   client: {
     fullName: string;
-    companyName?: string | null;
     nationality?: string | null;
-    isProxy?: boolean;
-    proxyType?: string | null;
-    actualOwnerName?: string | null;
-    yachtName?: string | null;
-    yachtLengthFt?: string | null;
-    yachtWidthFt?: string | null;
-    yachtDraftFt?: string | null;
-    berthSizeDesired?: string | null;
     preferredContactMethod?: string | null;
     preferredLanguage?: string | null;
     timezone?: string | null;
@@ -30,6 +24,36 @@ interface ClientTabsOptions {
       label?: string | null;
       isPrimary: boolean;
     }>;
+    yachts: Array<{
+      id: string;
+      name: string;
+      hullNumber: string | null;
+      registration: string | null;
+      lengthFt: string | null;
+      widthFt: string | null;
+      status: string;
+    }>;
+    companies: Array<{
+      membershipId: string;
+      role: string;
+      isPrimary: boolean;
+      startDate: string | Date;
+      company: {
+        id: string;
+        name: string;
+        legalName: string | null;
+        status: string;
+      };
+    }>;
+    activeReservations: Array<{
+      id: string;
+      berthId: string;
+      yachtId: string;
+      startDate: string | Date;
+      tenureType: string;
+      status: string;
+    }>;
+    tags?: Array<{ id: string; name: string; color: string }>;
   };
 }
 
@@ -51,14 +75,10 @@ function OverviewTab({ client }: { client: ClientTabsOptions['client'] }) {
         <h3 className="text-sm font-medium mb-2">Personal Information</h3>
         <dl>
           <InfoRow label="Full Name" value={client.fullName} />
-          <InfoRow label="Company" value={client.companyName} />
           <InfoRow label="Nationality" value={client.nationality} />
           <InfoRow label="Preferred Language" value={client.preferredLanguage} />
           <InfoRow label="Timezone" value={client.timezone} />
-          <InfoRow
-            label="Preferred Contact"
-            value={client.preferredContactMethod}
-          />
+          <InfoRow label="Preferred Contact" value={client.preferredContactMethod} />
         </dl>
       </div>
 
@@ -72,18 +92,12 @@ function OverviewTab({ client }: { client: ClientTabsOptions['client'] }) {
                 key={c.id}
                 className="flex items-center gap-2 p-2 rounded-lg border bg-muted/30 text-sm"
               >
-                <span className="capitalize text-muted-foreground w-20 shrink-0">
-                  {c.channel}
-                </span>
+                <span className="capitalize text-muted-foreground w-20 shrink-0">{c.channel}</span>
                 <span className="flex-1">{c.value}</span>
                 {c.label && (
-                  <span className="text-xs text-muted-foreground capitalize">
-                    {c.label}
-                  </span>
-                )}
-                {c.isPrimary && (
-                  <span className="text-xs font-medium text-primary">Primary</span>
+                  <span className="text-xs text-muted-foreground capitalize">{c.label}</span>
                 )}
+                {c.isPrimary && <span className="text-xs font-medium text-primary">Primary</span>}
               </div>
             ))}
           </div>
@@ -92,41 +106,6 @@ function OverviewTab({ client }: { client: ClientTabsOptions['client'] }) {
         )}
       </div>
 
-      {/* Yacht Details */}
-      {(client.yachtName ||
-        client.yachtLengthFt ||
-        client.berthSizeDesired) && (
-        <div className="space-y-1">
-          <h3 className="text-sm font-medium mb-2">Yacht Details</h3>
-          <dl>
-            <InfoRow label="Yacht Name" value={client.yachtName} />
-            <InfoRow
-              label="Length"
-              value={
-                client.yachtLengthFt
-                  ? `${client.yachtLengthFt} ft`
-                  : undefined
-              }
-            />
-            <InfoRow
-              label="Width"
-              value={
-                client.yachtWidthFt ? `${client.yachtWidthFt} ft` : undefined
-              }
-            />
-            <InfoRow
-              label="Draft"
-              value={
-                client.yachtDraftFt
-                  ? `${client.yachtDraftFt} ft`
-                  : undefined
-              }
-            />
-            <InfoRow label="Berth Size Desired" value={client.berthSizeDesired} />
-          </dl>
-        </div>
-      )}
-
       {/* Source */}
       {(client.source || client.sourceDetails) && (
         <div className="space-y-1">
@@ -138,34 +117,54 @@ function OverviewTab({ client }: { client: ClientTabsOptions['client'] }) {
         </div>
       )}
 
-      {/* Proxy Info */}
-      {client.isProxy && (
+      {/* Tags */}
+      {client.tags && client.tags.length > 0 && (
         <div className="space-y-1">
-          <h3 className="text-sm font-medium mb-2">Proxy Information</h3>
-          <dl>
-            <InfoRow
-              label="Proxy Type"
-              value={client.proxyType?.replace('_', ' ')}
-            />
-            <InfoRow label="Actual Owner" value={client.actualOwnerName} />
-          </dl>
+          <h3 className="text-sm font-medium mb-2">Tags</h3>
+          <div className="flex flex-wrap gap-1">
+            {client.tags.map((tag) => (
+              <span
+                key={tag.id}
+                className="inline-block rounded-full px-2 py-0.5 text-xs font-medium"
+                style={{ backgroundColor: `${tag.color}20`, color: tag.color }}
+              >
+                {tag.name}
+              </span>
+            ))}
+          </div>
         </div>
       )}
     </div>
   );
 }
 
-export function getClientTabs({
-  clientId,
-  currentUserId,
-  client,
-}: ClientTabsOptions): DetailTab[] {
+export function getClientTabs({ clientId, currentUserId, client }: ClientTabsOptions): DetailTab[] {
   return [
     {
       id: 'overview',
       label: 'Overview',
       content: <OverviewTab client={client} />,
     },
+    {
+      id: 'yachts',
+      label: 'Yachts',
+      badge: client.yachts.length,
+      content: <ClientYachtsTab clientId={clientId} yachts={client.yachts} />,
+    },
+    {
+      id: 'companies',
+      label: 'Companies',
+      badge: client.companies.length,
+      content: <ClientCompaniesTab clientId={clientId} companies={client.companies} />,
+    },
+    {
+      id: 'reservations',
+      label: 'Reservations',
+      badge: client.activeReservations.length,
+      content: (
+        <ClientReservationsTab clientId={clientId} activeReservations={client.activeReservations} />
+      ),
+    },
     {
       id: 'interests',
       label: 'Interests',
@@ -178,13 +177,7 @@ export function getClientTabs({
     {
       id: 'notes',
       label: 'Notes',
-      content: (
-        <NotesList
-          entityType="clients"
-          entityId={clientId}
-          currentUserId={currentUserId}
-        />
-      ),
+      content: <NotesList entityType="clients" entityId={clientId} currentUserId={currentUserId} />,
     },
     {
       id: 'files',
diff --git a/src/components/clients/client-yachts-tab.tsx b/src/components/clients/client-yachts-tab.tsx
new file mode 100644
index 0000000..c724e32
--- /dev/null
+++ b/src/components/clients/client-yachts-tab.tsx
@@ -0,0 +1,97 @@
+'use client';
+
+import { useState } from 'react';
+import Link from 'next/link';
+import { useParams } from 'next/navigation';
+import { Plus } from 'lucide-react';
+
+import { Button } from '@/components/ui/button';
+import {
+  Table,
+  TableHeader,
+  TableBody,
+  TableCell,
+  TableHead,
+  TableRow,
+} from '@/components/ui/table';
+import { EmptyState } from '@/components/shared/empty-state';
+import { PermissionGate } from '@/components/shared/permission-gate';
+import { YachtForm } from '@/components/yachts/yacht-form';
+
+interface ClientYachtsTabProps {
+  clientId: string;
+  yachts: Array<{
+    id: string;
+    name: string;
+    hullNumber: string | null;
+    registration: string | null;
+    lengthFt: string | null;
+    widthFt: string | null;
+    status: string;
+  }>;
+}
+
+export function ClientYachtsTab({ clientId: _clientId, yachts }: ClientYachtsTabProps) {
+  const routeParams = useParams<{ portSlug: string }>();
+  const portSlug = routeParams?.portSlug ?? '';
+  const [createOpen, setCreateOpen] = useState(false);
+
+  return (
+    <div className="space-y-4">
+      <div className="flex items-center justify-between">
+        <h3 className="text-sm font-medium">Client-owned yachts</h3>
+        <PermissionGate resource="yachts" action="create">
+          <Button size="sm" onClick={() => setCreateOpen(true)}>
+            <Plus className="mr-1.5 h-4 w-4" />
+            Add yacht
+          </Button>
+        </PermissionGate>
+      </div>
+
+      {yachts.length === 0 ? (
+        <EmptyState title="No yachts" description="No yachts owned by this client yet." />
+      ) : (
+        <div className="rounded-md border">
+          <Table>
+            <TableHeader>
+              <TableRow>
+                <TableHead>Name</TableHead>
+                <TableHead>Dimensions</TableHead>
+                <TableHead>Hull Number</TableHead>
+                <TableHead>Status</TableHead>
+              </TableRow>
+            </TableHeader>
+            <TableBody>
+              {yachts.map((y) => (
+                <TableRow key={y.id}>
+                  <TableCell>
+                    <Link
+                      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+                      href={`/${portSlug}/yachts/${y.id}` as any}
+                      className="text-primary hover:underline"
+                    >
+                      {y.name}
+                    </Link>
+                  </TableCell>
+                  <TableCell>
+                    {y.lengthFt && y.widthFt ? `${y.lengthFt} × ${y.widthFt} ft` : '—'}
+                  </TableCell>
+                  <TableCell>{y.hullNumber ?? '—'}</TableCell>
+                  <TableCell className="capitalize">{y.status.replace('_', ' ')}</TableCell>
+                </TableRow>
+              ))}
+            </TableBody>
+          </Table>
+        </div>
+      )}
+
+      {/*
+        TODO: YachtForm (Task 5.2) does not yet accept a preset owner prop.
+        When opened here, the user must manually pick this client in the owner
+        picker. Wire an `initialOwner` prop into YachtForm in a follow-up so
+        we can pre-select `{ type: 'client', id: clientId }`.
+      */}
+      {createOpen && <YachtForm open={createOpen} onOpenChange={setCreateOpen} />}
+    </div>
+  );
+}