diff --git a/runtime/openjdkjvmti/OpenjdkJvmTi.cc b/runtime/openjdkjvmti/OpenjdkJvmTi.cc
index 4aedec9..d9aea01 100644
--- a/runtime/openjdkjvmti/OpenjdkJvmTi.cc
+++ b/runtime/openjdkjvmti/OpenjdkJvmTi.cc
@@ -58,6 +58,7 @@
 #include "ti_redefine.h"
 #include "ti_stack.h"
 #include "ti_thread.h"
+#include "ti_threadgroup.h"
 #include "ti_timers.h"
 #include "transform.h"
 
@@ -205,13 +206,13 @@
   static jvmtiError GetTopThreadGroups(jvmtiEnv* env,
                                        jint* group_count_ptr,
                                        jthreadGroup** groups_ptr) {
-    return ERR(NOT_IMPLEMENTED);
+    return ThreadGroupUtil::GetTopThreadGroups(env, group_count_ptr, groups_ptr);
   }
 
   static jvmtiError GetThreadGroupInfo(jvmtiEnv* env,
                                        jthreadGroup group,
                                        jvmtiThreadGroupInfo* info_ptr) {
-    return ERR(NOT_IMPLEMENTED);
+    return ThreadGroupUtil::GetThreadGroupInfo(env, group, info_ptr);
   }
 
   static jvmtiError GetThreadGroupChildren(jvmtiEnv* env,
@@ -220,7 +221,12 @@
                                            jthread** threads_ptr,
                                            jint* group_count_ptr,
                                            jthreadGroup** groups_ptr) {
-    return ERR(NOT_IMPLEMENTED);
+    return ThreadGroupUtil::GetThreadGroupChildren(env,
+                                                   group,
+                                                   thread_count_ptr,
+                                                   threads_ptr,
+                                                   group_count_ptr,
+                                                   groups_ptr);
   }
 
   static jvmtiError GetStackTrace(jvmtiEnv* env,