diff --git a/src/main/java/de/ids_mannheim/korap/oauth2/dto/OAuth2ClientInfoDto.java b/src/main/java/de/ids_mannheim/korap/oauth2/dto/OAuth2ClientInfoDto.java
index 6f45900..6f7ab07 100644
--- a/src/main/java/de/ids_mannheim/korap/oauth2/dto/OAuth2ClientInfoDto.java
+++ b/src/main/java/de/ids_mannheim/korap/oauth2/dto/OAuth2ClientInfoDto.java
@@ -19,7 +19,7 @@
  *
  */
 @JsonInclude(Include.NON_EMPTY)
-public class OAuth2ClientInfoDto {
+public class OAuth2ClientInfoDto implements Comparable<OAuth2ClientInfoDto>{
     @JsonProperty("super")
     private boolean isSuper;
 
@@ -84,6 +84,12 @@
             }
         } 
     }
+    
+    @Override
+    public int compareTo (OAuth2ClientInfoDto o) {
+        return this.getClientName().compareTo(o.getClientName());
+    }
+
 
     public boolean isSuper () {
         return isSuper;
diff --git a/src/main/java/de/ids_mannheim/korap/web/controller/OAuthClientController.java b/src/main/java/de/ids_mannheim/korap/web/controller/OAuthClientController.java
index ee2d72f..1c41998 100644
--- a/src/main/java/de/ids_mannheim/korap/web/controller/OAuthClientController.java
+++ b/src/main/java/de/ids_mannheim/korap/web/controller/OAuthClientController.java
@@ -7,6 +7,7 @@
 
 import de.ids_mannheim.korap.constant.OAuth2Scope;
 import de.ids_mannheim.korap.exceptions.KustvaktException;
+import de.ids_mannheim.korap.exceptions.StatusCodes;
 import de.ids_mannheim.korap.oauth2.dto.OAuth2ClientDto;
 import de.ids_mannheim.korap.oauth2.dto.OAuth2ClientInfoDto;
 import de.ids_mannheim.korap.oauth2.service.OAuth2ClientService;
@@ -16,7 +17,6 @@
 import de.ids_mannheim.korap.web.filter.APIVersionFilter;
 import de.ids_mannheim.korap.web.filter.AuthenticationFilter;
 import de.ids_mannheim.korap.web.filter.BlockingFilter;
-import de.ids_mannheim.korap.web.filter.DemoFilter;
 import de.ids_mannheim.korap.web.filter.DemoUserFilter;
 import de.ids_mannheim.korap.web.input.OAuth2ClientJson;
 import de.ids_mannheim.korap.web.utils.ResourceFilters;
@@ -220,7 +220,8 @@
             @Context SecurityContext context,
             @FormParam("super_client_id") String superClientId,
             @FormParam("super_client_secret") String superClientSecret,
-            @FormParam("authorized_only") boolean authorizedOnly) {
+            @FormParam("authorized_only") boolean authorizedOnly, // deprecated
+            @FormParam("filter_by") String filterBy) {
 
         TokenContext tokenContext = (TokenContext) context.getUserPrincipal();
         String username = tokenContext.getUsername();
@@ -230,12 +231,34 @@
                     OAuth2Scope.LIST_USER_CLIENT);
 
             clientService.verifySuperClient(superClientId, superClientSecret);
+            
+            List<OAuth2ClientInfoDto> clients = null; 
+            
             if (authorizedOnly) {
-                return clientService.listUserAuthorizedClients(username);
+                clients = clientService.listUserAuthorizedClients(username);
             }
             else {
-                return clientService.listUserRegisteredClients(username);
+                if (filterBy !=null && !filterBy.isEmpty()) {
+                    if (filterBy.equals("authorized_only")) {
+                        clients = clientService.listUserAuthorizedClients(username);
+                    }
+                    else if (filterBy.equals("owned_only")) {
+                        clients = clientService.listUserRegisteredClients(username); 
+                    }
+                    else {
+                        throw new KustvaktException(
+                                StatusCodes.UNSUPPORTED_VALUE, "filter_by");
+                    }
+                }
+                else {               
+//                    clients = clientService.listUserAuthorizedClients(username);
+//                    clients.addAll(clientService.listUserRegisteredClients(username));
+                
+                    clients = clientService.listUserRegisteredClients(username);
+                }
             }
+            
+            return clients;
         }
         catch (KustvaktException e) {
             throw responseHandler.throwit(e);