diff --git a/src/app/api/v1/buyer-tasks/route.test.ts b/src/app/api/v1/buyer-tasks/route.test.ts
index b45c4a6..bb943c5 100644
--- a/src/app/api/v1/buyer-tasks/route.test.ts
+++ b/src/app/api/v1/buyer-tasks/route.test.ts
@@ -32,6 +32,8 @@ describe("GET /api/v1/buyer-tasks", () => {
         totalCost: 50,
         purchaseOrderId: null,
         poStatus: null,
+        poNumber: null,
+        supplierEmail: null,
         step: "needs_po",
       },
     ]);
diff --git a/src/components/buyer-tasks/buyer-task-group-card.test.tsx b/src/components/buyer-tasks/buyer-task-group-card.test.tsx
index 0ad2182..a96218d 100644
--- a/src/components/buyer-tasks/buyer-task-group-card.test.tsx
+++ b/src/components/buyer-tasks/buyer-task-group-card.test.tsx
@@ -17,6 +17,8 @@ const baseGroup = {
   totalCost: 50,
   purchaseOrderId: null,
   poStatus: null,
+  poNumber: null,
+  supplierEmail: null,
   step: "needs_po" as const,
 };
 
diff --git a/src/components/buyer-tasks/buyer-tasks-page.test.tsx b/src/components/buyer-tasks/buyer-tasks-page.test.tsx
index aca0bcf..69c4b53 100644
--- a/src/components/buyer-tasks/buyer-tasks-page.test.tsx
+++ b/src/components/buyer-tasks/buyer-tasks-page.test.tsx
@@ -17,6 +17,8 @@ const sampleGroup = {
   totalCost: 50,
   purchaseOrderId: null,
   poStatus: null,
+  poNumber: null,
+  supplierEmail: null,
   step: "needs_po" as const,
 };
 
diff --git a/src/components/buyer-tasks/buyer-tasks-page.tsx b/src/components/buyer-tasks/buyer-tasks-page.tsx
index 328fba5..a2fd67d 100644
--- a/src/components/buyer-tasks/buyer-tasks-page.tsx
+++ b/src/components/buyer-tasks/buyer-tasks-page.tsx
@@ -156,10 +156,18 @@ export function BuyerTasksPage() {
         onCancel={() => setMarkReadyFor(null)}
         busy={false}
       />
-      {sendPoFor?.purchaseOrderId && (
+      {sendPoFor && (
         <SendPoModal
           open={sendPoFor !== null}
-          purchaseOrder={{ id: sendPoFor.purchaseOrderId } as never}
+          purchaseOrder={{
+            id: sendPoFor.purchaseOrderId ?? "",
+            po_number: sendPoFor.poNumber ?? "",
+            expand: {
+              supplier: {
+                email: sendPoFor.supplierEmail ?? "",
+              },
+            },
+          } as never}
           onClose={() => setSendPoFor(null)}
           onSent={() => {
             setSendPoFor(null);
diff --git a/src/lib/server/buyer-tasks-service.test.ts b/src/lib/server/buyer-tasks-service.test.ts
index c021352..b16da9a 100644
--- a/src/lib/server/buyer-tasks-service.test.ts
+++ b/src/lib/server/buyer-tasks-service.test.ts
@@ -227,6 +227,58 @@ describe("listBuyerTasks", () => {
     expect(filter).not.toContain(`item_status = "po_generated"`);
   });
 
+  it("populates poNumber and supplierEmail from the expanded PO", async () => {
+    const { admin } = makeAdmin([
+      baseItem({
+        purchase_order: "po-1",
+        item_status: "po_generated",
+        expand: {
+          order: baseOrder,
+          supplier: baseSupplier,
+          purchase_order: {
+            id: "po-1",
+            status: "draft",
+            po_number: "PO-26072901",
+            expand: {
+              supplier: {
+                id: "sup-1",
+                email: "orders@steelco.example",
+              },
+            },
+          },
+        },
+      }),
+    ]);
+    vi.mocked(getAdminPocketBase).mockResolvedValue(admin as never);
+
+    const groups = await listBuyerTasks("po_draft");
+
+    expect(groups).toHaveLength(1);
+    expect(groups[0].poNumber).toBe("PO-26072901");
+    expect(groups[0].supplierEmail).toBe("orders@steelco.example");
+  });
+
+  it("leaves poNumber and supplierEmail null when the PO has no expand", async () => {
+    const { admin } = makeAdmin([
+      baseItem({
+        purchase_order: "po-1",
+        item_status: "po_generated",
+        expand: {
+          order: baseOrder,
+          supplier: baseSupplier,
+          purchase_order: { id: "po-1", status: "draft" },
+        },
+      }),
+    ]);
+    vi.mocked(getAdminPocketBase).mockResolvedValue(admin as never);
+
+    const groups = await listBuyerTasks("po_draft");
+
+    expect(groups).toHaveLength(1);
+    expect(groups[0].poNumber).toBeNull();
+    expect(groups[0].supplierEmail).toBeNull();
+  });
+
   it("does not include a separate ready_delivery exclusion in po_sent post-filter", async () => {
     // The ready_delivery exclusion moved to the PB filter (covered by
     // the filter-content assertions above). Verify the service still
diff --git a/src/lib/server/buyer-tasks-service.ts b/src/lib/server/buyer-tasks-service.ts
index 0b8ee62..7ecab6a 100644
--- a/src/lib/server/buyer-tasks-service.ts
+++ b/src/lib/server/buyer-tasks-service.ts
@@ -21,6 +21,8 @@ export type BuyerTaskGroup = {
   totalCost: number;
   purchaseOrderId: string | null;
   poStatus: "draft" | "sent" | "sending" | "received" | "mail_failed" | "cancelled" | null;
+  poNumber: string | null;
+  supplierEmail: string | null;
   step: BuyerTaskTab;
 };
 
@@ -62,7 +64,7 @@ export async function listBuyerTasks(tab: BuyerTaskTab): Promise<BuyerTaskGroup[
     if (!orderId || !supplierId) continue;
 
     const po = item.expand?.purchase_order as
-      | { id: string; status: BuyerTaskGroup["poStatus"] }
+      | { id: string; status: BuyerTaskGroup["poStatus"]; po_number?: string; expand?: { supplier?: { email?: string } } }
       | undefined;
 
     // Post-filter by PO status (tab-specific). The PB filter can't
@@ -95,6 +97,8 @@ export async function listBuyerTasks(tab: BuyerTaskTab): Promise<BuyerTaskGroup[
         totalCost: 0,
         purchaseOrderId: po?.id ?? null,
         poStatus: po?.status ?? null,
+        poNumber: po && typeof po === "object" && "po_number" in po ? String((po as { po_number?: string }).po_number ?? "") || null : null,
+        supplierEmail: (po as { expand?: { supplier?: { email?: string } } } | undefined)?.expand?.supplier?.email ?? null,
         step: tab,
       };
       groups.set(groupId, group);