diff --git a/client/src/utils/runtimeContext.js b/client/src/utils/runtimeContext.js
index fab55fb..fed9ead 100644
--- a/client/src/utils/runtimeContext.js
+++ b/client/src/utils/runtimeContext.js
@@ -4,6 +4,7 @@ const COMPANY_ID_QUERY_KEYS = [
   'blt-gtw-fc-cid',
   'bltt-gtw-f-c-cid',
 ];
+const COMPANY_ID_STORAGE_KEY = 'sms_runtime_company_id';
 
 function getRuntimeUrl() {
   if (typeof window === 'undefined') return null;
@@ -30,6 +31,26 @@ function getPathMatch(pathname, regex) {
   return match?.[1] || '';
 }
 
+function readStoredCompanyId() {
+  if (typeof sessionStorage === 'undefined') return '';
+
+  try {
+    return (sessionStorage.getItem(COMPANY_ID_STORAGE_KEY) || '').trim();
+  } catch {
+    return '';
+  }
+}
+
+function persistCompanyId(companyId) {
+  if (!companyId || typeof sessionStorage === 'undefined') return;
+
+  try {
+    sessionStorage.setItem(COMPANY_ID_STORAGE_KEY, companyId);
+  } catch {
+    // Ignore storage errors; URL/referrer extraction still works for the current request.
+  }
+}
+
 function getFirstSearchParam(url, keys) {
   if (!url) return '';
 
@@ -44,14 +65,17 @@ function getFirstSearchParam(url, keys) {
 export function getRuntimeCompanyId() {
   const runtimeUrl = getRuntimeUrl();
   const referrerUrl = getReferrerUrl();
-
-  return (
+  const companyId = (
     getFirstSearchParam(runtimeUrl, COMPANY_ID_QUERY_KEYS)
     || getPathMatch(runtimeUrl?.pathname || '', /\/company\/([^/]+)/i)
     || getFirstSearchParam(referrerUrl, COMPANY_ID_QUERY_KEYS)
     || getPathMatch(referrerUrl?.pathname || '', /\/company\/([^/]+)/i)
+    || readStoredCompanyId()
     || ''
   );
+
+  persistCompanyId(companyId);
+  return companyId;
 }
 
 export function getRuntimeApplicationId() {