diff --git a/api_tests/institutions/views/test_institution_summary_metrics.py b/api_tests/institutions/views/test_institution_summary_metrics.py
index 5c7bc2645d1..8993003f500 100644
--- a/api_tests/institutions/views/test_institution_summary_metrics.py
+++ b/api_tests/institutions/views/test_institution_summary_metrics.py
@@ -196,6 +196,74 @@ def test_get_report(self, app, url, institutional_admin, institution, reports, u
         assert attributes['monthly_logged_in_user_count'] == 180
         assert attributes['monthly_active_user_count'] == 160
 
+    def test_get_report_with_multiple_months_and_institutions(
+        self, app, url, institutional_admin, institution
+    ):
+        # Create reports for multiple months and institutions
+        other_institution = InstitutionFactory()
+        reports = [
+            _summary_report_factory(
+                '2024-09', institution,
+                user_count=250,
+                public_project_count=200,
+                private_project_count=150,
+                public_registration_count=120,
+                embargoed_registration_count=110,
+                published_preprint_count=130,
+                public_file_count=140,
+                storage_byte_count=20000000000,
+                monthly_logged_in_user_count=220,
+                monthly_active_user_count=200,
+            ),
+            _summary_report_factory(
+                '2024-08', institution,
+                user_count=200,
+                public_project_count=150,
+                private_project_count=125,
+                public_registration_count=110,
+                embargoed_registration_count=105,
+                published_preprint_count=115,
+                public_file_count=120,
+                storage_byte_count=15000000000,
+                monthly_logged_in_user_count=180,
+                monthly_active_user_count=160,
+            ),
+            _summary_report_factory(
+                '2024-09', other_institution,
+                user_count=300,
+                public_project_count=250,
+                private_project_count=200,
+                public_registration_count=180,
+                embargoed_registration_count=170,
+                published_preprint_count=190,
+                public_file_count=210,
+                storage_byte_count=25000000000,
+                monthly_logged_in_user_count=270,
+                monthly_active_user_count=260,
+            ),
+        ]
+
+        resp = app.get(url, auth=institutional_admin.auth)
+        assert resp.status_code == 200
+
+        data = resp.json['data']
+
+        assert data['id'] == institution._id
+        assert data['type'] == 'institution-summary-metrics'
+
+        attributes = data['attributes']
+
+        assert attributes['user_count'] == 250
+        assert attributes['public_project_count'] == 200
+        assert attributes['private_project_count'] == 150
+        assert attributes['public_registration_count'] == 120
+        assert attributes['embargoed_registration_count'] == 110
+        assert attributes['published_preprint_count'] == 130
+        assert attributes['public_file_count'] == 140
+        assert attributes['storage_byte_count'] == 20000000000
+        assert attributes['monthly_logged_in_user_count'] == 220
+        assert attributes['monthly_active_user_count'] == 200
+
 
 def _summary_report_factory(yearmonth, institution, **kwargs):
     report = InstitutionMonthlySummaryReport(