diff --git a/legal-api/src/legal_api/models/business.py b/legal-api/src/legal_api/models/business.py
index 76ae8cf464..005ed8c204 100644
--- a/legal-api/src/legal_api/models/business.py
+++ b/legal-api/src/legal_api/models/business.py
@@ -536,7 +536,8 @@ def _slim_json(self):
             'inDissolution': self.in_dissolution,
             'legalName': self.business_legal_name,
             'legalType': self.legal_type,
-            'state': self.state.name if self.state else Business.State.ACTIVE.name
+            'state': self.state.name if self.state else Business.State.ACTIVE.name,
+            'lastModified': self.last_modified.isoformat()
         }
 
         if self.tax_id:
diff --git a/legal-api/tests/unit/models/test_business.py b/legal-api/tests/unit/models/test_business.py
index 6cda1bb70d..e7e6289b3a 100644
--- a/legal-api/tests/unit/models/test_business.py
+++ b/legal-api/tests/unit/models/test_business.py
@@ -293,7 +293,7 @@ def test_good_standing_check_transition_filing(session, test_name, has_no_transi
         restoration_filing.save()
     elif test_name == 'TRANSITION_COMPLETED':
         factory_completed_filing(business, TRANSITION_FILING_TEMPLATE, filing_type='transition')
-    
+
     check_result = business._has_no_transition_filed_after_restoration()
     assert check_result == has_no_transition_filed
     with patch.object(flags, 'is_on', return_value=True):
@@ -330,6 +330,7 @@ def test_business_json(session):
         'legalName': 'legal_name',
         'legalType': Business.LegalTypes.COOP.value,
         'state': Business.State.ACTIVE.name,
+        'lastModified': EPOCH_DATETIME.isoformat(),
         'taxId': '123456789'
     }
 
diff --git a/queue_services/entity-filer/src/entity_filer/worker.py b/queue_services/entity-filer/src/entity_filer/worker.py
index 5e331629ea..2dbc8aca92 100644
--- a/queue_services/entity-filer/src/entity_filer/worker.py
+++ b/queue_services/entity-filer/src/entity_filer/worker.py
@@ -338,6 +338,7 @@ async def process_filing(filing_msg: Dict, flask_app: Flask):  # pylint: disable
 
             business_type = business.legal_type if business else filing_submission['business']['legal_type']
             filing_submission.set_processed(business_type)
+            business.last_modified = filing_submission.completion_date
 
             filing_submission._meta_data = json.loads(  # pylint: disable=W0212
                 json.dumps(filing_meta.asjson, default=json_serial)