diff --git a/spiffworkflow-backend/src/spiffworkflow_backend/routes/process_api_blueprint.py b/spiffworkflow-backend/src/spiffworkflow_backend/routes/process_api_blueprint.py
index 6f09df97..3fb0b66d 100644
--- a/spiffworkflow-backend/src/spiffworkflow_backend/routes/process_api_blueprint.py
+++ b/spiffworkflow-backend/src/spiffworkflow_backend/routes/process_api_blueprint.py
@@ -899,7 +899,6 @@ def process_instance_list(
             SpiffStepDetailsModel.completed_by_user_id == g.user.id
         )
 
-    # TODO: not sure if this is exactly what is wanted
     if report_filter.with_tasks_completed_by_my_group is True:
         process_instance_query = process_instance_query.filter(
             ProcessInstanceModel.status.in_(["complete", "error", "terminated"])  # type: ignore
@@ -918,22 +917,18 @@ def process_instance_list(
         process_instance_query = process_instance_query.filter(
             SpiffLoggingModel.spiff_step == SpiffStepDetailsModel.spiff_step
         )
-
-        my_groups = (
-            select(UserGroupAssignmentModel)  # type: ignore
-            .where(UserGroupAssignmentModel.user_id == g.user.id)
-            .with_only_columns(UserGroupAssignmentModel.group_id)
+        process_instance_query = process_instance_query.join(
+            GroupModel,
+            GroupModel.id == SpiffStepDetailsModel.lane_assignment_id,
         )
-        users_in_my_groups = (
-            select(UserGroupAssignmentModel)  # type: ignore
-            .where(UserGroupAssignmentModel.group_id.in_(my_groups))
-            .with_only_columns(UserGroupAssignmentModel.user_id)
+        process_instance_query = process_instance_query.join(
+            UserGroupAssignmentModel,
+            UserGroupAssignmentModel.group_id == GroupModel.id,
         )
-
         process_instance_query = process_instance_query.filter(
-            SpiffStepDetailsModel.completed_by_user_id.in_(users_in_my_groups)  # type: ignore
+            UserGroupAssignmentModel.user_id == g.user.id
         )
-
+        
     process_instances = (
         process_instance_query.group_by(ProcessInstanceModel.id)
         .order_by(