diff --git a/advlabdb/assistantModelViews.py b/advlabdb/assistantModelViews.py
index 4165bef..36a3b00 100644
--- a/advlabdb/assistantModelViews.py
+++ b/advlabdb/assistantModelViews.py
@@ -3,6 +3,7 @@ from flask_admin import expose
 from flask_admin.model.template import EndpointLinkRowAction
 from flask_security import admin_change_password, current_user
 from flask_wtf import FlaskForm
+from markupsafe import Markup
 from wtforms.fields import TextAreaField
 from wtforms.validators import Optional
 
@@ -54,25 +55,7 @@ class AssistantGroupExperimentView(SecureAssistantModelView):
         "group.part_students": "Students",
     }
 
-    def part_students_formatter(view, context, model, name):
-        part_students = deep_getattr(model, name)
-        if part_students is not None:
-            return ", ".join([str(part_student.student) for part_student in part_students])
-
-        return attr
-
-    def appointments_formatter(view, context, model, name):
-        appointments = deep_getattr(model, name)
-        if appointments is not None:
-            return ", ".join([str(appointment.date) for appointment in appointments])
-
-        return attr
-
-    column_formatters = {
-        "semester_experiment.experiment": str_formatter,
-        "group.part_students": part_students_formatter,
-        "appointments": appointments_formatter,
-    }
+    column_default_sort = ("experiment_marks_missing", True)
 
     column_extra_row_actions = [
         EndpointLinkRowAction(
@@ -82,6 +65,34 @@ class AssistantGroupExperimentView(SecureAssistantModelView):
         )
     ]
 
+    def part_students_formatter(view, context, model, name):
+        part_students = deep_getattr(model, name)
+        if part_students is not None:
+            return ", ".join([str(part_student.student) for part_student in part_students])
+
+        return ""
+
+    def appointments_formatter(view, context, model, name):
+        appointments = deep_getattr(model, name)
+        if appointments is not None:
+            return ", ".join([str(appointment.date) for appointment in appointments])
+
+        return ""
+
+    def experiment_marks_missing_formatter(view, context, model, name):
+        experiment_marks_missing = getattr(model, name)
+        if experiment_marks_missing is True:
+            return Markup("<span style='color: red;'>Yes</span>")
+
+        return "No"
+
+    column_formatters = {
+        "semester_experiment.experiment": str_formatter,
+        "group.part_students": part_students_formatter,
+        "appointments": appointments_formatter,
+        "experiment_marks_missing": experiment_marks_missing_formatter,
+    }
+
     def query_modifier(self, query):
         return (
             query.join(SemesterExperiment)