diff --git a/src/app/(protected)/vendors/_components/use-vendor-roster-selection.ts b/src/app/(protected)/vendors/_components/use-vendor-roster-selection.ts
index 4eb141b1..4bd467f1 100644
--- a/src/app/(protected)/vendors/_components/use-vendor-roster-selection.ts
+++ b/src/app/(protected)/vendors/_components/use-vendor-roster-selection.ts
@@ -153,6 +153,11 @@ export function useVendorRosterSelection({
       void fetchRosterByCompany(selectedRoster.companyId)
         .then((roster) => {
           if (requestIdRef.current !== requestId) return;
+          // SH-250: refresh the visible company fields alongside rowVersion.
+          // Refreshing only selectedRoster left the form on pre-conflict values,
+          // so a retry diffed stale fields against the reloaded roster and could
+          // overwrite the concurrent company update that caused the 409.
+          reset(withCompanyFieldsOnly(roster));
           setSelectedRoster(roster);
           retryTargetRef.current = null;
         })
@@ -161,7 +166,7 @@ export function useVendorRosterSelection({
           setLoadErrorMessage(RELOAD_ERROR_MESSAGE);
         });
     }
-  }, [clearConflict, fetchRosterByCompany, mode, query, selectedRoster]);
+  }, [clearConflict, fetchRosterByCompany, mode, query, reset, selectedRoster]);
 
   const retryLoad = useCallback(() => {
     const target = retryTargetRef.current;
diff --git a/src/domain/vendors/mappers/vendor-roster-mapper.ts b/src/domain/vendors/mappers/vendor-roster-mapper.ts
index e4de67dd..641042ef 100644
--- a/src/domain/vendors/mappers/vendor-roster-mapper.ts
+++ b/src/domain/vendors/mappers/vendor-roster-mapper.ts
@@ -152,7 +152,15 @@ export function mapVendorRosterAdditivePatchToBackend(
       return mapped;
     }),
   };
-  if (patch.companyFields) payload.companyFields = { ...patch.companyFields };
+  if (patch.companyFields) {
+    // SH-250: match the reconcile write path, which canonicalizes companyPhone.
+    // Copying companyFields verbatim let additive patches send a different phone
+    // shape than PUT for the same user input.
+    const companyFields = { ...patch.companyFields };
+    if (companyFields.companyPhone !== undefined)
+      companyFields.companyPhone = toCanonicalPhone(companyFields.companyPhone);
+    payload.companyFields = companyFields;
+  }
   return payload;
 }
 
diff --git a/src/domain/vendors/schemas/vendor-roster-schema.ts b/src/domain/vendors/schemas/vendor-roster-schema.ts
index a429d69e..9358b12b 100644
--- a/src/domain/vendors/schemas/vendor-roster-schema.ts
+++ b/src/domain/vendors/schemas/vendor-roster-schema.ts
@@ -83,11 +83,14 @@ export const vendorCompanyRosterUpdateSchema = vendorCompanyRosterSchema.and(
 
 export type VendorCompanyRosterUpdateValues = z.infer<typeof vendorCompanyRosterUpdateSchema>;
 
+// SH-250: the preferred-contact control was removed from the form, so seeding a
+// value here fabricated one on submit. `append` already omits it; the schema
+// keeps it optional, so both paths now agree and the backend receives it only
+// when a real value exists.
 export const emptyRosterTechnician: RosterTechnicianValues = {
   contactName: "",
   phone: "",
   email: "",
-  preferredContact: "Phone",
   tradeSpecialties: "",
   isActive: true,
 };
diff --git a/src/test/app/(protected)/vendors/use-vendor-roster-form.test.tsx b/src/test/app/(protected)/vendors/use-vendor-roster-form.test.tsx
index 80091636..777363fd 100644
--- a/src/test/app/(protected)/vendors/use-vendor-roster-form.test.tsx
+++ b/src/test/app/(protected)/vendors/use-vendor-roster-form.test.tsx
@@ -503,6 +503,37 @@ describe("useVendorRosterForm additive add flow (SH-250)", () => {
     );
   });
 
+  it("refreshes the visible company fields on reload, not just rowVersion", async () => {
+    rosterGet.mockResolvedValueOnce(roster);
+    const { result } = renderHook(
+      () => {
+        const form = useVendorRosterForm({ mode: "create", startWithTechnician: true });
+        const name = useController({ control: form.control, name: "name" });
+        return { form, name };
+      },
+      { wrapper: makeWrapper(createClient()) },
+    );
+
+    await act(async () => {
+      await result.current.form.selectCompany(company);
+    });
+    expect(result.current.name.field.value).toBe("Gateway Plumbing");
+
+    // Someone else renamed the company, which is what caused the 409.
+    rosterGet.mockResolvedValueOnce({
+      ...roster,
+      rowVersion: "rv-2",
+      name: "Gateway Plumbing & Drain",
+    });
+    await act(async () => {
+      result.current.form.reload();
+    });
+
+    // Reload must not leave the form on the pre-conflict name, or the retry
+    // would diff stale fields and overwrite the concurrent update.
+    await waitFor(() => expect(result.current.name.field.value).toBe("Gateway Plumbing & Drain"));
+  });
+
   it("does not regress the Edit Vendor reconcile path (mode update)", () => {
     rosterQueryResult = {
       data: rosterWithTechnicians,
@@ -562,11 +593,13 @@ describe("useVendorRosterForm technician autopopulation (SH-246)", () => {
         contactName: "",
         phone: "",
         email: "",
-        preferredContact: "Phone",
         tradeSpecialties: "",
         isActive: true,
       },
     ]);
+    // SH-250: the blank row must not carry a fabricated preferredContact, since
+    // the control was removed from the form and `append` omits it too.
+    expect(technicians[0]).not.toHaveProperty("preferredContact");
     expect(technicians).not.toContainEqual(expect.objectContaining({ contactName: "Ray Holt" }));
     expect(technicians).not.toContainEqual(
       expect.objectContaining({ contactName: "Amy Santiago" }),