diff --git a/src/lib/companyHelpers.ts b/src/lib/companyHelpers.ts
index b558beb0..bb20b747 100644
--- a/src/lib/companyHelpers.ts
+++ b/src/lib/companyHelpers.ts
@@ -5,14 +5,46 @@ import { CompanyFormData, TempCompanyData } from '@/types/company';
 import { handleError } from './errorHandler';
 import { withRetry, isRetryableError } from './retryHelpers';
 import { logger } from './logger';
+import { checkSubmissionRateLimit, recordSubmissionAttempt } from './submissionRateLimiter';
+import { sanitizeErrorMessage } from './errorSanitizer';
 
 export type { CompanyFormData, TempCompanyData };
 
+/**
+ * Rate limiting helper - checks rate limits before allowing submission
+ */
+function checkRateLimitOrThrow(userId: string, action: string): void {
+  const rateLimit = checkSubmissionRateLimit(userId);
+  
+  if (!rateLimit.allowed) {
+    const sanitizedMessage = sanitizeErrorMessage(rateLimit.reason || 'Rate limit exceeded');
+    
+    logger.warn('[RateLimit] Company submission blocked', {
+      userId,
+      action,
+      reason: rateLimit.reason,
+      retryAfter: rateLimit.retryAfter,
+    });
+    
+    throw new Error(sanitizedMessage);
+  }
+  
+  logger.info('[RateLimit] Company submission allowed', {
+    userId,
+    action,
+    remaining: rateLimit.remaining,
+  });
+}
+
 export async function submitCompanyCreation(
   data: CompanyFormData, 
   companyType: 'manufacturer' | 'designer' | 'operator' | 'property_owner',
   userId: string
 ) {
+  // Phase 3: Rate limiting check
+  checkRateLimitOrThrow(userId, 'company_creation');
+  recordSubmissionAttempt(userId);
+
   // Check if user is banned (with quick retry for read operation)
   const profile = await withRetry(
     async () => {
@@ -145,6 +177,10 @@ export async function submitCompanyUpdate(
   data: CompanyFormData,
   userId: string
 ) {
+  // Phase 3: Rate limiting check
+  checkRateLimitOrThrow(userId, 'company_update');
+  recordSubmissionAttempt(userId);
+
   // Check if user is banned (with quick retry for read operation)
   const profile = await withRetry(
     async () => {