diff --git a/frontend/src/__tests__/plans-column-filters.test.ts b/frontend/src/__tests__/plans-column-filters.test.ts
index 1bc85e937..6d99fd1d2 100644
--- a/frontend/src/__tests__/plans-column-filters.test.ts
+++ b/frontend/src/__tests__/plans-column-filters.test.ts
@@ -189,6 +189,23 @@ describe('Planned Purchases column filters (issue #166 follow-up)', () => {
     expect(labels).toEqual(['Jan 2, 2026', 'Jan 10, 2026', 'Jun 2, 2026', 'Dec 1, 2026']);
   });
 
+  // #1851: a bound plan spanning providers is shown as provider "multiple" and lists
+  // its real providers; the provider options are those providers, never "multiple".
+  test('provider options list a bound plan\'s providers, not "multiple"', async () => {
+    (api.getPlannedPurchases as jest.Mock).mockResolvedValue({ purchases: [
+      { ...seedPurchases[0], id: 'b1', provider: 'multiple', providers: ['aws', 'gcp'] },
+      { ...seedPurchases[1], id: 'u1', provider: 'azure' },
+      { ...seedPurchases[0], id: 'e1', provider: 'oci', providers: [] },
+    ] });
+    await loadPlans();
+    document.querySelector<HTMLButtonElement>(
+      '#planned-purchases-list th .column-filter-btn[data-column="provider"]',
+    )?.click();
+    const values = Array.from(document.querySelectorAll<HTMLInputElement>('.column-filter-popover .column-filter-item input[type="checkbox"]'))
+      .map((i) => i.dataset['value']);
+    expect(values).toEqual(['aws', 'azure', 'gcp', 'oci']);
+  });
+
   test('clicking a trigger opens a popover detached to document.body', async () => {
     await loadPlans();
     const providerBtn = document.querySelector<HTMLButtonElement>(
diff --git a/frontend/src/plans.ts b/frontend/src/plans.ts
index d562ca4ab..c11251af0 100644
--- a/frontend/src/plans.ts
+++ b/frontend/src/plans.ts
@@ -338,6 +338,15 @@ const PLANS_NUMERIC_COLUMNS: ReadonlySet<state.PlansColumnId> = new Set<state.Pl
   'count', 'upfront_cost', 'estimated_savings',
 ]);
 
+// A bound plan spanning providers has provider "multiple" and lists its real
+// providers (#1746); the provider options are those providers, never "multiple".
+function plansProviderOptions(purchases: readonly PlannedPurchase[]): string[] {
+  return sortedDistinctValues(
+    purchases.flatMap(p => (p.providers && p.providers.length > 0 ? p.providers : [p.provider ?? ''])),
+    (value) => value,
+  );
+}
+
 function plansColumnLabel(column: state.PlansColumnId): string {
   switch (column) {
     case 'plan_name':          return 'Plan';
@@ -382,7 +391,9 @@ function openPlansColumnPopover(column: state.PlansColumnId, anchor: HTMLElement
     column,
     label: plansColumnLabel(column),
     kind: PLANS_NUMERIC_COLUMNS.has(column) ? 'numeric' : 'categorical',
-    distinctValues: sortedDistinctValues(lastLoadedPurchases, (p) => categoricalCellValueForPlan(p, column)),
+    distinctValues: column === 'provider'
+      ? plansProviderOptions(lastLoadedPurchases)
+      : sortedDistinctValues(lastLoadedPurchases, (p) => categoricalCellValueForPlan(p, column)),
     displayLabel: (value) => plansCategoricalDisplayLabel(column, value),
     getFilter: () => state.getPlansColumnFilters()[column],
     onCommit: (filter) => {