diff --git a/prisma/migrations/20261001090000_plate_number/migration.sql b/prisma/migrations/20261001090000_plate_number/migration.sql
new file mode 100644
index 0000000..c66b93f
--- /dev/null
+++ b/prisma/migrations/20261001090000_plate_number/migration.sql
@@ -0,0 +1,2 @@
+-- AlterTable
+ALTER TABLE "Stock" ADD COLUMN "plateNumber" TEXT;
diff --git a/prisma/schema.prisma b/prisma/schema.prisma
index c934d24..0c44c32 100644
--- a/prisma/schema.prisma
+++ b/prisma/schema.prisma
@@ -81,6 +81,7 @@ model Stock {
   paymentType        String?
   leaseProviderType  String?
   financeCompanyName String?
+  plateNumber        String?
   createdAt          DateTime @default(now())
   updatedAt          DateTime @updatedAt
 
diff --git a/scripts/api-check.js b/scripts/api-check.js
index dd2b1fb..08abaa6 100644
--- a/scripts/api-check.js
+++ b/scripts/api-check.js
@@ -308,6 +308,25 @@ async function run(port) {
     'lease with both GCI and finance failed'
   );
 
+  const registered = await request(port, 'PATCH', '/api/stocks/CH-GREEN/stage', {
+    token: dealerToken,
+    body: { stage: 'rmvRegistration' },
+  });
+  assert(registered.status === 200, 'rmv stage failed');
+  const plateMissing = await request(port, 'PATCH', '/api/stocks/CH-GREEN/stage', {
+    token: dealerToken,
+    body: { stage: 'plateReceived' },
+  });
+  assert(plateMissing.status === 400, 'plate received without a number should fail');
+  const plated = await request(port, 'PATCH', '/api/stocks/CH-GREEN/stage', {
+    token: dealerToken,
+    body: { stage: 'plateReceived', plateNumber: 'WP ABC-1234' },
+  });
+  assert(
+    plated.status === 200 && plated.json.data.plateNumber === 'WP ABC-1234',
+    'saving the plate number failed'
+  );
+
   const outside = await request(port, 'POST', '/api/stocks/CH-YELLOW/transfer', {
     token: repToken,
     body: { dealerId: dealerC.json.data.id },
diff --git a/src/lib/stockRules.js b/src/lib/stockRules.js
index fd72ac7..cb0fcea 100644
--- a/src/lib/stockRules.js
+++ b/src/lib/stockRules.js
@@ -52,6 +52,7 @@ function serializeStock(stock) {
     paymentType: stock.paymentType,
     leaseProviderType: stock.leaseProviderType,
     financeCompanyName: stock.financeCompanyName,
+    plateNumber: stock.plateNumber,
     ageInDays: days,
     badge: ageBadge(days),
   };
diff --git a/src/routes/stocks.js b/src/routes/stocks.js
index 4f41b42..a293cec 100644
--- a/src/routes/stocks.js
+++ b/src/routes/stocks.js
@@ -145,6 +145,11 @@ router.patch(
         data.financeCompanyName = null;
       }
     }
+    if (stage === 'plateReceived') {
+      const plateNumber = String(req.body?.plateNumber || '').trim();
+      if (!plateNumber) throw httpError(400, 'Plate number is required');
+      data.plateNumber = plateNumber;
+    }
 
     const updated = await prisma.stock.update({
       where: { id: stock.id },