diff --git a/src/api/mailchimp/mailchimp-api.ts b/src/api/mailchimp/mailchimp-api.ts
index cd3c9dbc..2d7e97b3 100644
--- a/src/api/mailchimp/mailchimp-api.ts
+++ b/src/api/mailchimp/mailchimp-api.ts
@@ -66,6 +66,36 @@ export const batchCreateMailchimpProfiles = async (
   }
 };
 
+export const batchUpdateMailchimpProfiles = async (
+  userProfiles: Partial<UpdateListMemberRequest>[],
+) => {
+  try {
+    const operations = [];
+
+    userProfiles.forEach((userProfile, index) => {
+      operations.push({
+        method: 'PATCH',
+        path: `/lists/${mailchimpAudienceId}/members/${getEmailMD5Hash(userProfile.email_address)}`,
+        operation_id: String(index),
+        body: JSON.stringify(userProfile),
+      });
+    });
+
+    const batchRequest = await mailchimp.batches.start({
+      operations: operations,
+    });
+    logger.log(`Mailchimp batch request: ${batchRequest}`);
+    logger.log('Wait 2 minutes before calling response...');
+
+    setTimeout(async () => {
+      const batchResponse = await mailchimp.batches.status(batchRequest.id);
+      logger.log(`Mailchimp batch response: ${batchResponse}`);
+    }, 120000);
+  } catch (error) {
+    throw new Error(`Batch update mailchimp profiles API call failed: ${JSON.stringify(error)}`);
+  }
+};
+
 // Note getMailchimpProfile is not currently used
 export const getMailchimpProfile = async (email: string): Promise<ListMember> => {
   try {
diff --git a/src/service-user-profiles/service-user-profiles.service.ts b/src/service-user-profiles/service-user-profiles.service.ts
index 0fa62a31..2952a02d 100644
--- a/src/service-user-profiles/service-user-profiles.service.ts
+++ b/src/service-user-profiles/service-user-profiles.service.ts
@@ -2,6 +2,7 @@ import { Injectable, Logger } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
 import {
   batchCreateMailchimpProfiles,
+  batchUpdateMailchimpProfiles,
   createMailchimpMergeField,
   createMailchimpProfile,
   updateMailchimpProfile,
@@ -234,7 +235,6 @@ export class ServiceUserProfilesService {
   }
 
   // Static bulk upload function to be used in specific cases e.g. bug prevented a subset of new users from being created
-  // Currently no endpoint for this function
   // UPDATE THE FILTERS to the current requirements
   public async bulkUploadMailchimpProfiles() {
     try {
@@ -265,6 +265,40 @@ export class ServiceUserProfilesService {
       throw new Error(`Bulk upload mailchimp profiles API call failed: ${error}`);
     }
   }
+  // Static bulk update function to be used in specific cases e.g. bug prevented a subset of users from being updated
+  // UPDATE THE FILTERS to the current requirements
+  public async bulkUpdateMailchimpProfiles() {
+    try {
+      const filterStartDate = '2024-10-29'; // UPDATE
+      const filterEndDate = '2025-01-06'; // UPDATE
+      const users = await this.userRepository.find({
+        where: {
+          // UPDATE TO ANY FILTERS
+          updatedAt: And(
+            Raw((alias) => `${alias} >= :filterStartDate`, { filterStartDate: filterStartDate }),
+            Raw((alias) => `${alias} < :filterEndDate`, { filterEndDate: filterEndDate }),
+          ),
+          createdAt: Raw((alias) => `${alias} < :filterStartDate`, {
+            filterStartDate: filterStartDate,
+          }),
+        },
+        relations: {
+          partnerAccess: { partner: true, therapySession: true },
+          courseUser: { course: true, sessionUser: { session: true } },
+        },
+      });
+      const mailchimpUserProfiles = users.map((user) =>
+        this.createCompleteMailchimpUserProfile(user),
+      );
+
+      await batchUpdateMailchimpProfiles(mailchimpUserProfiles);
+      logger.log(
+        `Updated batch mailchimp profiles for ${users.length} users, updated before ${filterStartDate}`,
+      );
+    } catch (error) {
+      throw new Error(`Bulk update mailchimp profiles API call failed: ${error}`);
+    }
+  }
 
   serializePartnersString(partnerAccesses: PartnerAccessEntity[]) {
     const partnersNames = partnerAccesses?.map((pa) => pa.partner.name.toLowerCase());
diff --git a/src/user/user.controller.ts b/src/user/user.controller.ts
index 30713ccb..32c5f565 100644
--- a/src/user/user.controller.ts
+++ b/src/user/user.controller.ts
@@ -117,4 +117,12 @@ export class UserController {
     await this.serviceUserProfilesService.bulkUploadMailchimpProfiles();
     return 'ok';
   }
+
+  @ApiBearerAuth()
+  @Get('/bulk-update-mailchimp-profiles')
+  @UseGuards(SuperAdminAuthGuard)
+  async bulkUpdateMailchimpProfiles() {
+    await this.serviceUserProfilesService.bulkUpdateMailchimpProfiles();
+    return 'ok';
+  }
 }