diff --git a/src/api/api-paths.ts b/src/api/api-paths.ts
index 37db2b85..33db519b 100644
--- a/src/api/api-paths.ts
+++ b/src/api/api-paths.ts
@@ -125,6 +125,7 @@ export const API_PATHS = {
   },
   vendor: {
     getList: "Vendor/GetVendorList",
+    getDirectoryList: "Vendor/GetVendorDirectoryList",
     getById: "Vendor/GetById",
     create: "Vendor/Create",
     update: "Vendor/Update",
diff --git a/src/app/(protected)/vendors/index.tsx b/src/app/(protected)/vendors/index.tsx
index 9cde2aa9..a9968f39 100644
--- a/src/app/(protected)/vendors/index.tsx
+++ b/src/app/(protected)/vendors/index.tsx
@@ -15,7 +15,7 @@ import { useVendorListState } from "./_components/use-vendor-list-state";
 import type { VendorFilters } from "./_components/vendor-filters";
 import type { VendorListItem } from "@/domain/vendors/types/vendor";
 import { useVendorFacets } from "@/domain/vendors/use-cases/use-vendor-facets";
-import { useVendorsList } from "@/domain/vendors/use-cases/use-vendors-list";
+import { useVendorDirectoryList } from "@/domain/vendors/use-cases/use-vendor-directory-list";
 
 interface AppliedChip {
   category: keyof VendorFilters;
@@ -125,9 +125,17 @@ export default function VendorsListPage() {
   const deactivation = useVendorDeactivation(closeDetail);
 
   const { data: facets } = useVendorFacets(filters.isActive);
-  const { data, isLoading, isFetching, error } = useVendorsList(filters.listParams);
-  const { data: activeCountData } = useVendorsList({ isActive: true, page: 1, pageSize: 1 });
-  const { data: inactiveCountData } = useVendorsList({ isActive: false, page: 1, pageSize: 1 });
+  const { data, isLoading, isFetching, error } = useVendorDirectoryList(filters.listParams);
+  const { data: activeCountData } = useVendorDirectoryList({
+    isActive: true,
+    page: 1,
+    pageSize: 1,
+  });
+  const { data: inactiveCountData } = useVendorDirectoryList({
+    isActive: false,
+    page: 1,
+    pageSize: 1,
+  });
 
   const rows = data?.items ?? [];
   const totalCount = data?.totalCount ?? 0;
diff --git a/src/domain/vendors/api/vendors-api.ts b/src/domain/vendors/api/vendors-api.ts
index 5afbc13e..fda4215e 100644
--- a/src/domain/vendors/api/vendors-api.ts
+++ b/src/domain/vendors/api/vendors-api.ts
@@ -76,6 +76,24 @@ export const vendorsApi = {
     };
   },
 
+  // SH-281: grouped company rows come from the dedicated directory endpoint;
+  // Vendor/GetVendorList stays on the legacy technician-level contract.
+  getDirectoryList: async (params: VendorsListParams = {}): Promise<VendorsListResult> => {
+    const data = await apiGet<unknown>(API_PATHS.vendor.getDirectoryList, {
+      searchParams: buildListParams(params),
+    });
+    const paginated = handlePaginatedResponse<unknown>(data, {
+      page: params.page,
+      pageSize: params.pageSize,
+    });
+    return {
+      items: mapVendorListItems(paginated.items),
+      totalCount: paginated.totalCount,
+      page: paginated.page,
+      pageSize: paginated.pageSize,
+    };
+  },
+
   getFacets: async (params?: VendorFacetsParams): Promise<VendorFacets> => {
     const data = await apiGet<unknown>(API_PATHS.vendor.facets, {
       searchParams: buildFacetsParams(params),
diff --git a/src/domain/vendors/use-cases/use-vendor-directory-list.ts b/src/domain/vendors/use-cases/use-vendor-directory-list.ts
new file mode 100644
index 00000000..b610af63
--- /dev/null
+++ b/src/domain/vendors/use-cases/use-vendor-directory-list.ts
@@ -0,0 +1,14 @@
+import { keepPreviousData, useQuery, type UseQueryResult } from "@tanstack/react-query";
+import { vendorsApi } from "@/domain/vendors/api/vendors-api";
+import type { VendorsListParams, VendorsListResult } from "@/domain/vendors/types/vendor";
+import { queryKeys } from "@/infra/query-key/query-key";
+
+export function useVendorDirectoryList(
+  params: VendorsListParams,
+): UseQueryResult<VendorsListResult, Error> {
+  return useQuery({
+    queryKey: queryKeys.vendors.directoryList(params as Record<string, unknown>),
+    queryFn: () => vendorsApi.getDirectoryList(params),
+    placeholderData: keepPreviousData,
+  });
+}
diff --git a/src/infra/query-key/query-key.ts b/src/infra/query-key/query-key.ts
index 36915f91..c4a9e284 100644
--- a/src/infra/query-key/query-key.ts
+++ b/src/infra/query-key/query-key.ts
@@ -68,6 +68,8 @@ export const queryKeys = {
     all: ["vendors"] as const,
     list: (params?: Record<string, unknown>) =>
       [...queryKeys.vendors.all, "list", params ?? {}] as const,
+    directoryList: (params?: Record<string, unknown>) =>
+      [...queryKeys.vendors.all, "directoryList", params ?? {}] as const,
     detail: (id: string | number) => [...queryKeys.vendors.all, "detail", id] as const,
     facets: (isActive?: boolean) => [...queryKeys.vendors.all, "facets", isActive ?? null] as const,
     dropdown: (trade?: string, siteZip?: string) =>
diff --git a/src/test/app/(protected)/vendor-pos/vendor-pos-legacy-vendors-list.test.tsx b/src/test/app/(protected)/vendor-pos/vendor-pos-legacy-vendors-list.test.tsx
new file mode 100644
index 00000000..986f41ad
--- /dev/null
+++ b/src/test/app/(protected)/vendor-pos/vendor-pos-legacy-vendors-list.test.tsx
@@ -0,0 +1,50 @@
+import { describe, expect, it, vi } from "vitest";
+import { screen } from "@testing-library/react";
+import VendorPosListPage from "@/app/(protected)/vendor-pos/index";
+import { renderWithProviders } from "@/test/test-utils";
+
+const useVendorPosList = vi.fn();
+const useVendorsList = vi.fn();
+const useVendorDirectoryList = vi.fn();
+
+vi.mock("@/domain/vendor-pos/use-cases/use-vendor-pos-list", () => ({
+  useVendorPosList: (...args: unknown[]) => useVendorPosList(...args),
+}));
+
+vi.mock("@/domain/vendors/use-cases/use-vendors-list", () => ({
+  useVendorsList: (...args: unknown[]) => useVendorsList(...args),
+}));
+
+vi.mock("@/domain/vendors/use-cases/use-vendor-directory-list", () => ({
+  useVendorDirectoryList: (...args: unknown[]) => useVendorDirectoryList(...args),
+}));
+
+describe("VendorPosListPage vendor source", () => {
+  it("keeps the legacy technician-level vendors list with pageSize 500", () => {
+    useVendorPosList.mockReturnValue({
+      data: { items: [], totalCount: 0, page: 1, pageSize: 12 },
+      isLoading: false,
+      isFetching: false,
+      error: null,
+    });
+    useVendorsList.mockReturnValue({
+      data: { items: [], totalCount: 0, page: 1, pageSize: 500 },
+      isLoading: false,
+      isFetching: false,
+      error: null,
+    });
+    useVendorDirectoryList.mockReturnValue({
+      data: { items: [], totalCount: 0, page: 1, pageSize: 500 },
+      isLoading: false,
+      isFetching: false,
+      error: null,
+    });
+
+    renderWithProviders(<VendorPosListPage />, { route: "/vendor-pos", withAuth: false });
+
+    expect(useVendorsList).toHaveBeenCalledWith({ page: 1, pageSize: 500 });
+    expect(useVendorsList).toHaveBeenCalledTimes(1);
+    expect(useVendorDirectoryList).not.toHaveBeenCalled();
+    expect(screen.getByRole("table")).toBeInTheDocument();
+  });
+});
diff --git a/src/test/app/(protected)/vendors/vendors-list.test.tsx b/src/test/app/(protected)/vendors/vendors-list.test.tsx
index d389d1c4..ab905729 100644
--- a/src/test/app/(protected)/vendors/vendors-list.test.tsx
+++ b/src/test/app/(protected)/vendors/vendors-list.test.tsx
@@ -5,12 +5,12 @@ import VendorsListPage from "@/app/(protected)/vendors/index";
 import type { VendorCompanyRoster, VendorListItem } from "@/domain/vendors/types/vendor";
 import { renderWithProviders } from "@/test/test-utils";
 
-const useVendorsList = vi.fn();
+const useVendorDirectoryList = vi.fn();
 const useVendorCompanyRoster = vi.fn();
 const useVendorDeactivationImpact = vi.fn();
 const mutate = vi.fn();
-vi.mock("@/domain/vendors/use-cases/use-vendors-list", () => ({
-  useVendorsList: (...args: unknown[]) => useVendorsList(...args),
+vi.mock("@/domain/vendors/use-cases/use-vendor-directory-list", () => ({
+  useVendorDirectoryList: (...args: unknown[]) => useVendorDirectoryList(...args),
 }));
 
 vi.mock("@/domain/vendors/use-cases/use-vendor-company-roster", () => ({
@@ -108,10 +108,12 @@ function setupDefaults() {
 describe("VendorsListPage", () => {
   it("renders prototype-aligned status and two row actions in both tabs", async () => {
     setupDefaults();
-    useVendorsList.mockImplementation((params: { isActive?: boolean; pageSize?: number }) => {
-      if (params.pageSize === 1) return result([], params.isActive ? 1 : 1);
-      return params.isActive ? result([activeVendor], 1) : result([inactiveVendor], 1);
-    });
+    useVendorDirectoryList.mockImplementation(
+      (params: { isActive?: boolean; pageSize?: number }) => {
+        if (params.pageSize === 1) return result([], params.isActive ? 1 : 1);
+        return params.isActive ? result([activeVendor], 1) : result([inactiveVendor], 1);
+      },
+    );
 
     renderWithProviders(<VendorsListPage />, { route: "/vendors", withAuth: false });
 
@@ -169,10 +171,12 @@ describe("VendorsListPage", () => {
         },
       ],
     };
-    useVendorsList.mockImplementation((params: { isActive?: boolean; pageSize?: number }) => {
-      if (params.pageSize === 1) return result([], 1);
-      return params.isActive ? result([groupedVendor], 1) : result([], 0);
-    });
+    useVendorDirectoryList.mockImplementation(
+      (params: { isActive?: boolean; pageSize?: number }) => {
+        if (params.pageSize === 1) return result([], 1);
+        return params.isActive ? result([groupedVendor], 1) : result([], 0);
+      },
+    );
 
     renderWithProviders(<VendorsListPage />, { route: "/vendors", withAuth: false });
 
@@ -198,10 +202,12 @@ describe("VendorsListPage", () => {
       state: " MO ",
       phone: " (314) 555-0198 ",
     };
-    useVendorsList.mockImplementation((params: { isActive?: boolean; pageSize?: number }) => {
-      if (params.pageSize === 1) return result([], 1);
-      return params.isActive ? result([vendorWithAllFields], 1) : result([], 0);
-    });
+    useVendorDirectoryList.mockImplementation(
+      (params: { isActive?: boolean; pageSize?: number }) => {
+        if (params.pageSize === 1) return result([], 1);
+        return params.isActive ? result([vendorWithAllFields], 1) : result([], 0);
+      },
+    );
 
     renderWithProviders(<VendorsListPage />, { route: "/vendors", withAuth: false });
 
@@ -228,10 +234,12 @@ describe("VendorsListPage", () => {
       state: "",
       phone: "  ",
     };
-    useVendorsList.mockImplementation((params: { isActive?: boolean; pageSize?: number }) => {
-      if (params.pageSize === 1) return result([], 1);
-      return params.isActive ? result([fallbackVendor], 1) : result([], 0);
-    });
+    useVendorDirectoryList.mockImplementation(
+      (params: { isActive?: boolean; pageSize?: number }) => {
+        if (params.pageSize === 1) return result([], 1);
+        return params.isActive ? result([fallbackVendor], 1) : result([], 0);
+      },
+    );
 
     renderWithProviders(<VendorsListPage />, { route: "/vendors", withAuth: false });
 
@@ -260,10 +268,12 @@ describe("VendorsListPage", () => {
       city: "",
       state: "",
     };
-    useVendorsList.mockImplementation((params: { isActive?: boolean; pageSize?: number }) => {
-      if (params.pageSize === 1) return result([], 1);
-      return params.isActive ? result([fallbackVendor], 1) : result([], 0);
-    });
+    useVendorDirectoryList.mockImplementation(
+      (params: { isActive?: boolean; pageSize?: number }) => {
+        if (params.pageSize === 1) return result([], 1);
+        return params.isActive ? result([fallbackVendor], 1) : result([], 0);
+      },
+    );
 
     renderWithProviders(<VendorsListPage />, { route: "/vendors", withAuth: false });
 
@@ -319,10 +329,12 @@ describe("VendorsListPage", () => {
       ...activeVendor,
       tradeSpecialties: "Backflow Preventers, Water Heaters, Drain Cleaning",
     };
-    useVendorsList.mockImplementation((params: { isActive?: boolean; pageSize?: number }) => {
-      if (params.pageSize === 1) return result([], 1);
-      return params.isActive ? result([multiTradeVendor], 1) : result([], 0);
-    });
+    useVendorDirectoryList.mockImplementation(
+      (params: { isActive?: boolean; pageSize?: number }) => {
+        if (params.pageSize === 1) return result([], 1);
+        return params.isActive ? result([multiTradeVendor], 1) : result([], 0);
+      },
+    );
 
     renderWithProviders(<VendorsListPage />, { route: "/vendors", withAuth: false });
 
@@ -346,10 +358,12 @@ describe("VendorsListPage", () => {
 
   it("does not show the +N badge when the vendor has a single trade", () => {
     setupDefaults();
-    useVendorsList.mockImplementation((params: { isActive?: boolean; pageSize?: number }) => {
-      if (params.pageSize === 1) return result([], 1);
-      return params.isActive ? result([activeVendor], 1) : result([], 0);
-    });
+    useVendorDirectoryList.mockImplementation(
+      (params: { isActive?: boolean; pageSize?: number }) => {
+        if (params.pageSize === 1) return result([], 1);
+        return params.isActive ? result([activeVendor], 1) : result([], 0);
+      },
+    );
 
     renderWithProviders(<VendorsListPage />, { route: "/vendors", withAuth: false });
 
@@ -370,10 +384,12 @@ describe("VendorsListPage", () => {
       ...activeVendor,
       tradeSpecialties: "Backflow Preventers, Water Heaters, Drain Cleaning",
     };
-    useVendorsList.mockImplementation((params: { isActive?: boolean; pageSize?: number }) => {
-      if (params.pageSize === 1) return result([], 1);
-      return params.isActive ? result([multiTradeVendor], 1) : result([], 0);
-    });
+    useVendorDirectoryList.mockImplementation(
+      (params: { isActive?: boolean; pageSize?: number }) => {
+        if (params.pageSize === 1) return result([], 1);
+        return params.isActive ? result([multiTradeVendor], 1) : result([], 0);
+      },
+    );
 
     renderWithProviders(<VendorsListPage />, { route: "/vendors", withAuth: false });
 
@@ -394,10 +410,12 @@ describe("VendorsListPage", () => {
       ...activeVendor,
       tradeSpecialties: "Backflow Preventers, Water Heaters",
     };
-    useVendorsList.mockImplementation((params: { isActive?: boolean; pageSize?: number }) => {
-      if (params.pageSize === 1) return result([], 1);
-      return params.isActive ? result([multiTradeVendor], 1) : result([], 0);
-    });
+    useVendorDirectoryList.mockImplementation(
+      (params: { isActive?: boolean; pageSize?: number }) => {
+        if (params.pageSize === 1) return result([], 1);
+        return params.isActive ? result([multiTradeVendor], 1) : result([], 0);
+      },
+    );
 
     renderWithProviders(<VendorsListPage />, { route: "/vendors", withAuth: false });
 
@@ -414,10 +432,12 @@ describe("VendorsListPage", () => {
       companyName: `Vendor ${index + 1}`,
     }));
 
-    useVendorsList.mockImplementation((params: { isActive?: boolean; pageSize?: number }) => {
-      if (params.pageSize === 1) return result([], params.isActive ? 25 : 0);
-      return result(pageVendors, 25);
-    });
+    useVendorDirectoryList.mockImplementation(
+      (params: { isActive?: boolean; pageSize?: number }) => {
+        if (params.pageSize === 1) return result([], params.isActive ? 25 : 0);
+        return result(pageVendors, 25);
+      },
+    );
 
     renderWithProviders(<VendorsListPage />, { route: "/vendors", withAuth: false });
 
@@ -434,10 +454,12 @@ describe("VendorsListPage", () => {
       error: null,
       refetch: vi.fn(),
     });
-    useVendorsList.mockImplementation((params: { isActive?: boolean; pageSize?: number }) => {
-      if (params.pageSize === 1) return result([], 1);
-      return params.isActive ? result([activeVendor], 1) : result([], 0);
-    });
+    useVendorDirectoryList.mockImplementation(
+      (params: { isActive?: boolean; pageSize?: number }) => {
+        if (params.pageSize === 1) return result([], 1);
+        return params.isActive ? result([activeVendor], 1) : result([], 0);
+      },
+    );
 
     renderWithProviders(<VendorsListPage />, { route: "/vendors", withAuth: false });
 
@@ -475,10 +497,12 @@ describe("VendorsListPage", () => {
       isLoading: false,
       error: null,
     });
-    useVendorsList.mockImplementation((params: { isActive?: boolean; pageSize?: number }) => {
-      if (params.pageSize === 1) return result([], 1);
-      return params.isActive ? result([activeVendor], 1) : result([], 0);
-    });
+    useVendorDirectoryList.mockImplementation(
+      (params: { isActive?: boolean; pageSize?: number }) => {
+        if (params.pageSize === 1) return result([], 1);
+        return params.isActive ? result([activeVendor], 1) : result([], 0);
+      },
+    );
 
     renderWithProviders(<VendorsListPage />, { route: "/vendors", withAuth: false });
 
@@ -516,10 +540,12 @@ describe("VendorsListPage", () => {
       isLoading: false,
       error: null,
     });
-    useVendorsList.mockImplementation((params: { isActive?: boolean; pageSize?: number }) => {
-      if (params.pageSize === 1) return result([], 1);
-      return params.isActive ? result([activeVendor], 1) : result([], 0);
-    });
+    useVendorDirectoryList.mockImplementation(
+      (params: { isActive?: boolean; pageSize?: number }) => {
+        if (params.pageSize === 1) return result([], 1);
+        return params.isActive ? result([activeVendor], 1) : result([], 0);
+      },
+    );
 
     renderWithProviders(<VendorsListPage />, { route: "/vendors", withAuth: false });
 
@@ -546,10 +572,12 @@ describe("VendorsListPage", () => {
       isLoading: false,
       error: null,
     });
-    useVendorsList.mockImplementation((params: { isActive?: boolean; pageSize?: number }) => {
-      if (params.pageSize === 1) return result([], 1);
-      return params.isActive ? result([activeVendor], 1) : result([], 0);
-    });
+    useVendorDirectoryList.mockImplementation(
+      (params: { isActive?: boolean; pageSize?: number }) => {
+        if (params.pageSize === 1) return result([], 1);
+        return params.isActive ? result([activeVendor], 1) : result([], 0);
+      },
+    );
 
     renderWithProviders(<VendorsListPage />, { route: "/vendors", withAuth: false });
 
@@ -577,10 +605,12 @@ describe("VendorsListPage", () => {
       error: null,
       refetch: vi.fn(),
     });
-    useVendorsList.mockImplementation((params: { isActive?: boolean; pageSize?: number }) => {
-      if (params.pageSize === 1) return result([], 1);
-      return params.isActive ? result([activeVendor], 1) : result([], 0);
-    });
+    useVendorDirectoryList.mockImplementation(
+      (params: { isActive?: boolean; pageSize?: number }) => {
+        if (params.pageSize === 1) return result([], 1);
+        return params.isActive ? result([activeVendor], 1) : result([], 0);
+      },
+    );
 
     renderWithProviders(<VendorsListPage />, { route: "/vendors", withAuth: false });
 
@@ -602,10 +632,12 @@ describe("VendorsListPage", () => {
       error: null,
       refetch: vi.fn(),
     });
-    useVendorsList.mockImplementation((params: { isActive?: boolean; pageSize?: number }) => {
-      if (params.pageSize === 1) return result([], 1);
-      return params.isActive ? result([companyOnlyVendor], 1) : result([], 0);
-    });
+    useVendorDirectoryList.mockImplementation(
+      (params: { isActive?: boolean; pageSize?: number }) => {
+        if (params.pageSize === 1) return result([], 1);
+        return params.isActive ? result([companyOnlyVendor], 1) : result([], 0);
+      },
+    );
 
     renderWithProviders(<VendorsListPage />, { route: "/vendors", withAuth: false });
 
@@ -616,4 +648,24 @@ describe("VendorsListPage", () => {
       "Gateway Plumbing",
     );
   });
+
+  it("loads rows and status counts through the directory hook", async () => {
+    setupDefaults();
+    useVendorDirectoryList.mockImplementation(
+      (params: { isActive?: boolean; pageSize?: number }) => {
+        if (params.pageSize === 1) return result([], params.isActive ? 3 : 2);
+        return result([activeVendor], 3);
+      },
+    );
+
+    renderWithProviders(<VendorsListPage />, { route: "/vendors", withAuth: false });
+
+    expect(useVendorDirectoryList).toHaveBeenCalledWith(
+      expect.objectContaining({ page: 1, pageSize: 48 }),
+    );
+    expect(useVendorDirectoryList).toHaveBeenCalledWith({ isActive: true, page: 1, pageSize: 1 });
+    expect(useVendorDirectoryList).toHaveBeenCalledWith({ isActive: false, page: 1, pageSize: 1 });
+    expect(screen.getByRole("tab", { name: "Active (3)" })).toBeInTheDocument();
+    expect(screen.getByRole("tab", { name: "Inactive (2)" })).toBeInTheDocument();
+  });
 });
diff --git a/src/test/domain/vendors/api/vendors-api.test.ts b/src/test/domain/vendors/api/vendors-api.test.ts
index 9a014fa2..8b33239e 100644
--- a/src/test/domain/vendors/api/vendors-api.test.ts
+++ b/src/test/domain/vendors/api/vendors-api.test.ts
@@ -326,3 +326,96 @@ describe("vendorsApi.getList", () => {
     await expect(vendorsApi.delete(8)).rejects.toThrow("Conflict");
   });
 });
+
+describe("vendorsApi.getDirectoryList", () => {
+  beforeEach(() => {
+    apiGet.mockReset();
+    apiGet.mockResolvedValue({
+      Data: [
+        {
+          Id: 7,
+          CompanyId: "co-1",
+          CompanyName: "Gateway Plumbing",
+          ContactName: "Adam Whyte",
+          Email: "dispatch@gateway.test",
+          Phone: "314-555-0198",
+          Address: "1 Market St",
+          City: "St. Louis",
+          State: "MO",
+          IsActive: false,
+          PreferredContact: "Email",
+          Technicians: [
+            {
+              Id: 7,
+              ContactName: "Adam Whyte",
+              Email: "adam@gateway.test",
+              Phone: "314-555-0198",
+              TradeSpecialties: "Plumbing",
+              IsActive: false,
+              TotalJobs: 3,
+            },
+          ],
+        },
+      ],
+      TotalCount: 1,
+    });
+  });
+
+  it("targets the dedicated directory endpoint while getList keeps the legacy route", async () => {
+    await vendorsApi.getDirectoryList({ search: "gateway", isActive: false, page: 1 });
+    await vendorsApi.getList({ search: "gateway", isActive: false, page: 1 });
+
+    expect(API_PATHS.vendor.getDirectoryList).toBe("Vendor/GetVendorDirectoryList");
+    expect(API_PATHS.vendor.getList).toBe("Vendor/GetVendorList");
+    expect(apiGet).toHaveBeenNthCalledWith(1, API_PATHS.vendor.getDirectoryList, {
+      searchParams: { search: "gateway", isActive: "false", page: 1, pageSize: 12 },
+    });
+    expect(apiGet).toHaveBeenNthCalledWith(2, API_PATHS.vendor.getList, {
+      searchParams: { search: "gateway", isActive: "false", page: 1, pageSize: 12 },
+    });
+  });
+
+  it("builds directory query parameters with the same repeated facet encoding", async () => {
+    await vendorsApi.getDirectoryList({
+      companies: ["Gateway Plumbing", "Metro HVAC"],
+      trades: ["Plumbing"],
+      locations: ["St. Louis, MO"],
+      jobBuckets: ["50-99"],
+    });
+
+    expect(apiGet).toHaveBeenCalledWith(API_PATHS.vendor.getDirectoryList, {
+      searchParams: {
+        search: "",
+        page: 1,
+        pageSize: 12,
+        "companies[0]": "Gateway Plumbing",
+        "companies[1]": "Metro HVAC",
+        "trades[0]": "Plumbing",
+        "locations[0]": "St. Louis, MO",
+        "jobBuckets[0]": "50-99",
+      },
+    });
+  });
+
+  it("maps grouped company rows with the shared grouped-row mapper", async () => {
+    const result = await vendorsApi.getDirectoryList({ isActive: false, page: 1 });
+
+    expect(result.items[0]).toMatchObject({
+      companyId: "co-1",
+      companyName: "Gateway Plumbing",
+      address: "1 Market St",
+      city: "St. Louis",
+      state: "MO",
+      isActive: false,
+      technicians: [
+        expect.objectContaining({
+          id: 7,
+          contactName: "Adam Whyte",
+          email: "adam@gateway.test",
+          phone: "314-555-0198",
+          totalJobs: 3,
+        }),
+      ],
+    });
+  });
+});
diff --git a/src/test/domain/vendors/use-cases/use-vendor-directory-list.test.tsx b/src/test/domain/vendors/use-cases/use-vendor-directory-list.test.tsx
new file mode 100644
index 00000000..cc898d8f
--- /dev/null
+++ b/src/test/domain/vendors/use-cases/use-vendor-directory-list.test.tsx
@@ -0,0 +1,80 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import { renderHook, waitFor } from "@testing-library/react";
+import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
+import type { ReactNode } from "react";
+
+const getDirectoryList = vi.fn();
+const getList = vi.fn();
+
+vi.mock("@/domain/vendors/api/vendors-api", () => ({
+  vendorsApi: {
+    getDirectoryList: (...args: unknown[]) => getDirectoryList(...args),
+    getList: (...args: unknown[]) => getList(...args),
+  },
+}));
+
+import { useVendorDirectoryList } from "@/domain/vendors/use-cases/use-vendor-directory-list";
+import { useVendorsList } from "@/domain/vendors/use-cases/use-vendors-list";
+import { queryKeys } from "@/infra/query-key/query-key";
+
+const emptyResult = { items: [], totalCount: 0, page: 1, pageSize: 12 };
+
+function createClient(): QueryClient {
+  return new QueryClient({
+    defaultOptions: { queries: { retry: false } },
+  });
+}
+
+function makeWrapper(client: QueryClient) {
+  return function Wrapper({ children }: { children: ReactNode }) {
+    return <QueryClientProvider client={client}>{children}</QueryClientProvider>;
+  };
+}
+
+describe("useVendorDirectoryList", () => {
+  beforeEach(() => {
+    getDirectoryList.mockReset();
+    getList.mockReset();
+    getDirectoryList.mockResolvedValue(emptyResult);
+    getList.mockResolvedValue(emptyResult);
+  });
+
+  it("fetches through the directory endpoint, never the legacy list", async () => {
+    const { result } = renderHook(() => useVendorDirectoryList({ isActive: true, page: 1 }), {
+      wrapper: makeWrapper(createClient()),
+    });
+
+    await waitFor(() => expect(result.current.isSuccess).toBe(true));
+
+    expect(getDirectoryList).toHaveBeenCalledWith({ isActive: true, page: 1 });
+    expect(getList).not.toHaveBeenCalled();
+  });
+
+  it("keeps a query key distinct from the legacy list key", () => {
+    const params = { isActive: true, page: 1, pageSize: 12 };
+
+    expect(queryKeys.vendors.directoryList(params)).not.toEqual(queryKeys.vendors.list(params));
+    expect(queryKeys.vendors.directoryList(params)).toEqual(
+      queryKeys.vendors.directoryList(params),
+    );
+    expect(queryKeys.vendors.directoryList(params)[1]).toBe("directoryList");
+    expect(queryKeys.vendors.list(params)[1]).toBe("list");
+  });
+
+  it("caches directory and legacy results independently for the same params", async () => {
+    const params = { isActive: true, page: 1 } as const;
+    const client = createClient();
+    const directory = renderHook(() => useVendorDirectoryList({ ...params }), {
+      wrapper: makeWrapper(client),
+    });
+    const legacy = renderHook(() => useVendorsList({ ...params }), {
+      wrapper: makeWrapper(client),
+    });
+
+    await waitFor(() => expect(directory.result.current.isSuccess).toBe(true));
+    await waitFor(() => expect(legacy.result.current.isSuccess).toBe(true));
+
+    expect(getDirectoryList).toHaveBeenCalledTimes(1);
+    expect(getList).toHaveBeenCalledTimes(1);
+  });
+});