diff --git a/lib/mv/membership/member_export/build.ex b/lib/mv/membership/member_export/build.ex
index 323681d..ff8cf76 100644
--- a/lib/mv/membership/member_export/build.ex
+++ b/lib/mv/membership/member_export/build.ex
@@ -244,16 +244,22 @@ defmodule Mv.Membership.MemberExport.Build do
   defp maybe_sort(query, _field, nil), do: {query, false}
 
   defp maybe_sort(query, field, order) when is_binary(field) do
-    if custom_field_sort?(field) do
-      {query, true}
-    else
-      field_atom = String.to_existing_atom(field)
+    cond do
+      field == "groups" ->
+        # Groups sort → in-memory nach dem Read (wie Tabelle)
+        {query, true}
 
-      if field_atom in (Mv.Constants.member_fields() -- [:notes]) do
-        {Ash.Query.sort(query, [{field_atom, String.to_existing_atom(order)}]), false}
-      else
-        {query, false}
-      end
+      custom_field_sort?(field) ->
+        {query, true}
+
+      true ->
+        field_atom = String.to_existing_atom(field)
+
+        if field_atom in (Mv.Constants.member_fields() -- [:notes]) do
+          {Ash.Query.sort(query, [{field_atom, String.to_existing_atom(order)}]), false}
+        else
+          {query, false}
+        end
     end
   rescue
     ArgumentError -> {query, false}
@@ -263,21 +269,45 @@ defmodule Mv.Membership.MemberExport.Build do
     do: []
 
   defp sort_members_by_custom_field(members, field, order, custom_fields) when is_binary(field) do
-    id_str = String.trim_leading(field, @custom_field_prefix)
-    custom_field = Enum.find(custom_fields, fn cf -> to_string(cf.id) == id_str end)
+    if field == "groups" do
+      sort_members_by_groups_export(members, order)
+    else
+      id_str = String.trim_leading(field, @custom_field_prefix)
+      custom_field = Enum.find(custom_fields, fn cf -> to_string(cf.id) == id_str end)
 
-    if is_nil(custom_field), do: members
+      if is_nil(custom_field), do: members
 
-    key_fn = fn member ->
-      cfv = find_cfv(member, custom_field)
-      raw = if cfv, do: cfv.value, else: nil
-      MemberExportSort.custom_field_sort_key(custom_field.value_type, raw)
+      key_fn = fn member ->
+        cfv = find_cfv(member, custom_field)
+        raw = if cfv, do: cfv.value, else: nil
+        MemberExportSort.custom_field_sort_key(custom_field.value_type, raw)
+      end
+
+      members
+      |> Enum.map(fn m -> {m, key_fn.(m)} end)
+      |> Enum.sort(fn {_, ka}, {_, kb} -> MemberExportSort.key_lt(ka, kb, order) end)
+      |> Enum.map(fn {m, _} -> m end)
+    end
+  end
+
+  defp sort_members_by_groups_export(members, order) do
+    # Members with groups first, then by first group name alphabetically (min = first by sort order)
+    # Match table behavior from MvWeb.MemberLive.Index.sort_members_by_groups/2
+    first_group_name = fn member ->
+      (member.groups || [])
+      |> Enum.map(& &1.name)
+      |> Enum.min(fn -> nil end)
     end
 
     members
-    |> Enum.map(fn m -> {m, key_fn.(m)} end)
-    |> Enum.sort(fn {_, ka}, {_, kb} -> MemberExportSort.key_lt(ka, kb, order) end)
-    |> Enum.map(fn {m, _} -> m end)
+    |> Enum.sort_by(fn member ->
+      name = first_group_name.(member)
+      # Nil (no groups) sorts last in asc, first in desc
+      {name == nil, name || ""}
+    end)
+    |> then(fn list ->
+      if order == "desc", do: Enum.reverse(list), else: list
+    end)
   end
 
   defp find_cfv(member, custom_field) do
diff --git a/lib/mv_web/controllers/member_export_controller.ex b/lib/mv_web/controllers/member_export_controller.ex
index 911e6d9..4ed8f2d 100644
--- a/lib/mv_web/controllers/member_export_controller.ex
+++ b/lib/mv_web/controllers/member_export_controller.ex
@@ -341,17 +341,23 @@ defmodule MvWeb.MemberExportController do
   defp maybe_sort_export(query, _field, nil), do: {query, false}
 
   defp maybe_sort_export(query, field, order) when is_binary(field) do
-    if custom_field_sort?(field) do
-      # Custom field sort → in-memory nach dem Read (wie Tabelle)
-      {query, true}
-    else
-      field_atom = String.to_existing_atom(field)
+    cond do
+      field == "groups" ->
+        # Groups sort → in-memory nach dem Read (wie Tabelle)
+        {query, true}
 
-      if field_atom in (Mv.Constants.member_fields() -- [:notes]) do
-        {Ash.Query.sort(query, [{field_atom, String.to_existing_atom(order)}]), false}
-      else
-        {query, false}
-      end
+      custom_field_sort?(field) ->
+        # Custom field sort → in-memory nach dem Read (wie Tabelle)
+        {query, true}
+
+      true ->
+        field_atom = String.to_existing_atom(field)
+
+        if field_atom in (Mv.Constants.member_fields() -- [:notes]) do
+          {Ash.Query.sort(query, [{field_atom, String.to_existing_atom(order)}]), false}
+        else
+          {query, false}
+        end
     end
   rescue
     ArgumentError -> {query, false}
@@ -370,35 +376,60 @@ defmodule MvWeb.MemberExportController do
   defp sort_members_by_custom_field_export(members, field, order, custom_fields)
        when is_binary(field) do
     order = order || "asc"
-    id_str = String.trim_leading(field, @custom_field_prefix)
 
-    custom_field =
-      Enum.find(custom_fields, fn cf -> to_string(cf.id) == id_str end)
-
-    if is_nil(custom_field) do
-      members
+    if field == "groups" do
+      sort_members_by_groups_export(members, order)
     else
-      # Match table:
-      # 1) values first, empty last
-      # 2) sort only values
-      # 3) for desc, reverse only the values-part
-      {with_values, without_values} =
-        Enum.split_with(members, fn member ->
-          has_non_empty_custom_field_value?(member, custom_field)
-        end)
+      id_str = String.trim_leading(field, @custom_field_prefix)
 
-      sorted_with_values =
-        Enum.sort_by(with_values, fn member ->
-          extract_member_sort_value(member, custom_field)
-        end)
+      custom_field =
+        Enum.find(custom_fields, fn cf -> to_string(cf.id) == id_str end)
 
-      sorted_with_values =
-        if order == "desc", do: Enum.reverse(sorted_with_values), else: sorted_with_values
+      if is_nil(custom_field) do
+        members
+      else
+        # Match table:
+        # 1) values first, empty last
+        # 2) sort only values
+        # 3) for desc, reverse only the values-part
+        {with_values, without_values} =
+          Enum.split_with(members, fn member ->
+            has_non_empty_custom_field_value?(member, custom_field)
+          end)
 
-      sorted_with_values ++ without_values
+        sorted_with_values =
+          Enum.sort_by(with_values, fn member ->
+            extract_member_sort_value(member, custom_field)
+          end)
+
+        sorted_with_values =
+          if order == "desc", do: Enum.reverse(sorted_with_values), else: sorted_with_values
+
+        sorted_with_values ++ without_values
+      end
     end
   end
 
+  defp sort_members_by_groups_export(members, order) do
+    # Members with groups first, then by first group name alphabetically (min = first by sort order)
+    # Match table behavior from MvWeb.MemberLive.Index.sort_members_by_groups/2
+    first_group_name = fn member ->
+      (member.groups || [])
+      |> Enum.map(& &1.name)
+      |> Enum.min(fn -> nil end)
+    end
+
+    members
+    |> Enum.sort_by(fn member ->
+      name = first_group_name.(member)
+      # Nil (no groups) sorts last in asc, first in desc
+      {name == nil, name || ""}
+    end)
+    |> then(fn list ->
+      if order == "desc", do: Enum.reverse(list), else: list
+    end)
+  end
+
   defp has_non_empty_custom_field_value?(member, custom_field) do
     case find_cfv(member, custom_field) do
       nil ->
diff --git a/lib/mv_web/live/member_live/index.ex b/lib/mv_web/live/member_live/index.ex
index 526f858..9d93b08 100644
--- a/lib/mv_web/live/member_live/index.ex
+++ b/lib/mv_web/live/member_live/index.ex
@@ -1066,13 +1066,6 @@ defmodule MvWeb.MemberLive.Index do
     end
   end
 
-  defp computed_field?(field) do
-    computed_atoms = FieldVisibility.computed_member_fields()
-    computed_strings = Enum.map(computed_atoms, &Atom.to_string/1)
-
-    (is_atom(field) and field in computed_atoms) or
-      (is_binary(field) and field in computed_strings)
-  end
 
   defp apply_sort_to_query(query, field, order) do
     cond do