diff --git a/analytics/management/commands/populate_analytics_db.py b/analytics/management/commands/populate_analytics_db.py
index 0826217bce..a50c756fd9 100644
--- a/analytics/management/commands/populate_analytics_db.py
+++ b/analytics/management/commands/populate_analytics_db.py
@@ -27,12 +27,12 @@ from zerver.lib.timestamp import floor_to_day
 from zerver.lib.upload import upload_message_attachment_from_request
 from zerver.models import (
     Client,
+    NamedUserGroup,
     Realm,
     RealmAuditLog,
     Recipient,
     Stream,
     Subscription,
-    UserGroup,
     UserProfile,
 )
 from zerver.models.groups import SystemGroups
@@ -114,7 +114,7 @@ class Command(BaseCommand):
             force_date_joined=installation_time,
         )
 
-        administrators_user_group = UserGroup.objects.get(
+        administrators_user_group = NamedUserGroup.objects.get(
             name=SystemGroups.ADMINISTRATORS, realm=realm, is_system_group=True
         )
         stream = Stream.objects.create(
diff --git a/zerver/actions/create_realm.py b/zerver/actions/create_realm.py
index 176613f498..2a3f2b7287 100644
--- a/zerver/actions/create_realm.py
+++ b/zerver/actions/create_realm.py
@@ -126,7 +126,7 @@ def set_default_for_realm_permission_group_settings(realm: Realm) -> None:
 
     for setting_name, permission_configuration in Realm.REALM_PERMISSION_GROUP_SETTINGS.items():
         group_name = permission_configuration.default_group_name
-        setattr(realm, setting_name, system_groups_dict[group_name])
+        setattr(realm, setting_name, system_groups_dict[group_name].usergroup_ptr)
 
     realm.save(update_fields=list(Realm.REALM_PERMISSION_GROUP_SETTINGS.keys()))
 
diff --git a/zerver/actions/realm_settings.py b/zerver/actions/realm_settings.py
index a2eb76489d..4598e329ea 100644
--- a/zerver/actions/realm_settings.py
+++ b/zerver/actions/realm_settings.py
@@ -24,6 +24,7 @@ from zerver.models import (
     ArchivedAttachment,
     Attachment,
     Message,
+    NamedUserGroup,
     Realm,
     RealmAuditLog,
     RealmAuthenticationMethod,
@@ -658,7 +659,7 @@ def do_change_realm_plan_type(
         # If downgrading to a plan that no longer has access to change
         # can_access_all_users_group, set it back to the default
         # value.
-        everyone_system_group = UserGroup.objects.get(
+        everyone_system_group = NamedUserGroup.objects.get(
             name=SystemGroups.EVERYONE, realm=realm, is_system_group=True
         )
         if realm.can_access_all_users_group_id != everyone_system_group.id:
diff --git a/zerver/lib/bulk_create.py b/zerver/lib/bulk_create.py
index 42cf5ac688..3bc7af4423 100644
--- a/zerver/lib/bulk_create.py
+++ b/zerver/lib/bulk_create.py
@@ -7,13 +7,13 @@ from zerver.lib.create_user import create_user_profile, get_display_email_addres
 from zerver.lib.initial_password import initial_password
 from zerver.lib.streams import render_stream_description
 from zerver.models import (
+    NamedUserGroup,
     Realm,
     RealmAuditLog,
     RealmUserDefault,
     Recipient,
     Stream,
     Subscription,
-    UserGroup,
     UserGroupMembership,
     UserProfile,
 )
@@ -127,10 +127,10 @@ def bulk_create_users(
 
     Subscription.objects.bulk_create(subscriptions_to_create)
 
-    full_members_system_group = UserGroup.objects.get(
+    full_members_system_group = NamedUserGroup.objects.get(
         name=SystemGroups.FULL_MEMBERS, realm=realm, is_system_group=True
     )
-    members_system_group = UserGroup.objects.get(
+    members_system_group = NamedUserGroup.objects.get(
         name=SystemGroups.MEMBERS, realm=realm, is_system_group=True
     )
     group_memberships_to_create: List[UserGroupMembership] = []
@@ -198,7 +198,7 @@ def bulk_create_streams(realm: Realm, stream_dict: Dict[str, Dict[str, Any]]) ->
     existing_streams = {
         name.lower() for name in Stream.objects.filter(realm=realm).values_list("name", flat=True)
     }
-    administrators_user_group = UserGroup.objects.get(
+    administrators_user_group = NamedUserGroup.objects.get(
         name=SystemGroups.ADMINISTRATORS, is_system_group=True, realm=realm
     )
     streams_to_create: List[Stream] = []
diff --git a/zerver/lib/import_realm.py b/zerver/lib/import_realm.py
index 212b8339f6..6479b28d53 100644
--- a/zerver/lib/import_realm.py
+++ b/zerver/lib/import_realm.py
@@ -194,7 +194,7 @@ def fix_upload_links(data: TableData, message_table: TableName) -> None:
 
 def fix_streams_can_remove_subscribers_group_column(data: TableData, realm: Realm) -> None:
     table = get_db_table(Stream)
-    admins_group = UserGroup.objects.get(
+    admins_group = NamedUserGroup.objects.get(
         name=SystemGroups.ADMINISTRATORS, realm=realm, is_system_group=True
     )
     for stream in data[table]:
@@ -1781,7 +1781,7 @@ def add_users_to_system_user_groups(
     user_profiles: List[UserProfile],
     role_system_groups_dict: Dict[int, NamedUserGroup],
 ) -> None:
-    full_members_system_group = UserGroup.objects.get(
+    full_members_system_group = NamedUserGroup.objects.get(
         name=SystemGroups.FULL_MEMBERS,
         realm=realm,
         is_system_group=True,
diff --git a/zerver/lib/streams.py b/zerver/lib/streams.py
index 8ed39edaca..f6801e406a 100644
--- a/zerver/lib/streams.py
+++ b/zerver/lib/streams.py
@@ -23,6 +23,7 @@ from zerver.lib.types import APIStreamDict
 from zerver.lib.user_groups import is_user_in_group
 from zerver.models import (
     DefaultStreamGroup,
+    NamedUserGroup,
     Realm,
     RealmAuditLog,
     Recipient,
@@ -142,7 +143,7 @@ def create_stream_if_needed(
     )
 
     if can_remove_subscribers_group is None:
-        can_remove_subscribers_group = UserGroup.objects.get(
+        can_remove_subscribers_group = NamedUserGroup.objects.get(
             name=SystemGroups.ADMINISTRATORS, is_system_group=True, realm=realm
         )
 
diff --git a/zerver/lib/test_classes.py b/zerver/lib/test_classes.py
index c2d8f09354..fcba2af464 100644
--- a/zerver/lib/test_classes.py
+++ b/zerver/lib/test_classes.py
@@ -99,6 +99,7 @@ from zerver.lib.webhooks.common import (
 from zerver.models import (
     Client,
     Message,
+    NamedUserGroup,
     PushDeviceToken,
     Reaction,
     Realm,
@@ -106,7 +107,6 @@ from zerver.models import (
     Recipient,
     Stream,
     Subscription,
-    UserGroup,
     UserGroupMembership,
     UserMessage,
     UserProfile,
@@ -1364,7 +1364,7 @@ Output:
         history_public_to_subscribers = get_default_value_for_history_public_to_subscribers(
             realm, invite_only, history_public_to_subscribers
         )
-        administrators_user_group = UserGroup.objects.get(
+        administrators_user_group = NamedUserGroup.objects.get(
             name=SystemGroups.ADMINISTRATORS, realm=realm, is_system_group=True
         )
 
@@ -1972,7 +1972,7 @@ Output:
         self.send_personal_message(shiva, polonius)
         self.send_huddle_message(aaron, [polonius, zoe])
 
-        members_group = UserGroup.objects.get(name="role:members", realm=realm)
+        members_group = NamedUserGroup.objects.get(name="role:members", realm=realm)
         do_change_realm_permission_group_setting(
             realm, "can_access_all_users_group", members_group, acting_user=None
         )
diff --git a/zerver/lib/user_groups.py b/zerver/lib/user_groups.py
index 4e240e14fc..d77a943464 100644
--- a/zerver/lib/user_groups.py
+++ b/zerver/lib/user_groups.py
@@ -256,7 +256,7 @@ def user_groups_in_realm_serialized(realm: Realm) -> List[UserGroupDict]:
     Django's ORM doesn't properly support the left join between
     UserGroup and UserGroupMembership that we need.
     """
-    realm_groups = UserGroup.objects.filter(realm=realm)
+    realm_groups = NamedUserGroup.objects.filter(realm=realm)
     group_dicts: Dict[int, UserGroupDict] = {}
     for user_group in realm_groups:
         group_dicts[user_group.id] = dict(
@@ -403,7 +403,9 @@ def get_recursive_subgroups_for_groups(
 
 
 def get_role_based_system_groups_dict(realm: Realm) -> Dict[str, NamedUserGroup]:
-    system_groups = NamedUserGroup.objects.filter(realm=realm, is_system_group=True)
+    system_groups = NamedUserGroup.objects.filter(realm=realm, is_system_group=True).select_related(
+        "usergroup_ptr"
+    )
     system_groups_name_dict = {}
     for group in system_groups:
         system_groups_name_dict[group.name] = group
diff --git a/zerver/views/streams.py b/zerver/views/streams.py
index f9eba6922b..36891ce342 100644
--- a/zerver/views/streams.py
+++ b/zerver/views/streams.py
@@ -90,7 +90,7 @@ from zerver.lib.validator import (
     check_union,
     to_non_negative_int,
 )
-from zerver.models import Realm, Stream, UserGroup, UserProfile
+from zerver.models import NamedUserGroup, Realm, Stream, UserProfile
 from zerver.models.users import get_system_bot
 
 
@@ -580,7 +580,7 @@ def add_subscriptions_backend(
         can_remove_subscribers_group_default_name = Stream.stream_permission_group_settings[
             "can_remove_subscribers_group"
         ].default_group_name
-        can_remove_subscribers_group = UserGroup.objects.get(
+        can_remove_subscribers_group = NamedUserGroup.objects.get(
             name=can_remove_subscribers_group_default_name,
             realm=user_profile.realm,
             is_system_group=True,