diff --git a/src/transformer/events/core/group_message_sent.php b/src/transformer/events/core/group_message_sent.php
new file mode 100644
index 000000000..a5a7342bc
--- /dev/null
+++ b/src/transformer/events/core/group_message_sent.php
@@ -0,0 +1,74 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Transformer fn for group message sent event.
+ *
+ * @package   logstore_xapi
+ * @copyright Milt Reder <milt@yetanalytics.com>
+ *
+ * @license   https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+namespace src\transformer\events\core;
+
+use src\transformer\utils as utils;
+
+/**
+ * Transformer fn for group message sent event.
+ *
+ * @param array $config The transformer config settings.
+ * @param \stdClass $event The event to be transformed.
+ * @return array
+ */
+
+function group_message_sent(array $config, \stdClass $event) {
+    $repo = $config['repo'];
+    $user = $repo->read_record_by_id('user', $event->userid);
+    $message = $repo->read_record_by_id('messages', $event->objectid);
+    $conversation = $repo->read_record_by_id(
+        'message_conversations',
+        $message->conversationid
+    );
+    $group = $repo->read_record_by_id('groups', $conversation->itemid);
+    $course = $repo->read_record_by_id('course', $group->courseid);
+    $lang = utils\get_course_lang($course);
+
+    return [[
+        'actor' => utils\get_user($config, $user),
+        'verb' => [
+            'id' => 'http://activitystrea.ms/send',
+            'display' => [
+                $lang => 'Sent'
+            ],
+        ],
+        'object' => utils\get_activity\message($config, $lang, $message),
+        'context' => [
+            'extensions' => utils\extensions\base($config, $event, null),
+            'contextActivities' => [
+                'grouping' => [
+                    utils\get_activity\course_group($config, $course, $group)
+                ],
+                'parent' => [
+                    utils\get_activity\course($config, $course),
+                ],
+                'category' => [
+                    utils\get_activity\site($config),
+                ],
+            ],
+        ]
+    ]];
+}
diff --git a/src/transformer/get_event_function_map.php b/src/transformer/get_event_function_map.php
index a75baf8d7..7353e0a2f 100644
--- a/src/transformer/get_event_function_map.php
+++ b/src/transformer/get_event_function_map.php
@@ -48,6 +48,7 @@ function get_event_function_map() {
         '\core\event\course_resources_list_viewed' => 'core\course_resources_list_viewed',
         '\core\event\group_created' => 'core\group_created',
         '\core\event\group_deleted' => 'core\group_deleted',
+        '\core\event\group_message_sent' => 'core\group_message_sent',
         '\core\event\group_member_added' => 'core\group_member_added',
         '\core\event\group_member_removed' => 'core\group_member_removed',
         '\core\event\user_created' => 'core\user_created',
diff --git a/src/transformer/utils/get_activity/message.php b/src/transformer/utils/get_activity/message.php
new file mode 100644
index 000000000..5c2640eee
--- /dev/null
+++ b/src/transformer/utils/get_activity/message.php
@@ -0,0 +1,51 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Transformer utility for retrieving message activities.
+ *
+ * @package   logstore_xapi
+ * @copyright Milt Reder <milt@yetanalytics.com>
+ * @license   https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+namespace src\transformer\utils\get_activity;
+
+use src\transformer\utils as utils;
+
+/**
+ * Transformer utility for retrieving message activities.
+ *
+ * @param array $config The transformer config settings.
+ * @param string $lang The language tag to use.
+ * @param \stdClass $message The message.
+ * @return array
+ */
+function message(array $config, string $lang, \stdClass $message) {
+    return [
+        'id' => $config['app_url'] . '/message?id=' . $message->id,
+        'objectType' => 'Activity',
+        'definition' => [
+            'type' => 'http://id.tincanapi.com/activitytype/chat-message',
+            'name' => [
+                $lang => $message->subject ?? '[Untitled Message]',
+            ],
+            'description' => [
+                $lang => $message->fullmessage,
+            ],
+        ]
+    ];
+}
diff --git a/tests/core/group_message_sent/new_group_message_sent/data.json b/tests/core/group_message_sent/new_group_message_sent/data.json
new file mode 100644
index 000000000..7c8d49e43
--- /dev/null
+++ b/tests/core/group_message_sent/new_group_message_sent/data.json
@@ -0,0 +1,23 @@
+{
+  "groups": [
+    {
+      "id": 1,
+      "name": "test_name",
+      "courseid": 1
+    }
+  ],
+  "messages": [
+    {
+      "id": 1,
+      "subject": "test_message_subject",
+      "fullmessage": "test_message_body",
+      "conversationid": 1
+    }
+  ],
+  "message_conversations": [
+    {
+      "id": 1,
+      "itemid": 1
+    }
+  ]
+}
diff --git a/tests/core/group_message_sent/new_group_message_sent/event.json b/tests/core/group_message_sent/new_group_message_sent/event.json
new file mode 100644
index 000000000..d73534937
--- /dev/null
+++ b/tests/core/group_message_sent/new_group_message_sent/event.json
@@ -0,0 +1,9 @@
+{
+  "courseid": 1,
+  "eventname": "\\core\\event\\group_message_sent",
+  "id": 1,
+  "objectid": 1,
+  "objecttable": "messages",
+  "timecreated": 1433946701,
+  "userid": 1
+}
diff --git a/tests/core/group_message_sent/new_group_message_sent/new_group_message_sent_test.php b/tests/core/group_message_sent/new_group_message_sent/new_group_message_sent_test.php
new file mode 100644
index 000000000..8f9f0ed46
--- /dev/null
+++ b/tests/core/group_message_sent/new_group_message_sent/new_group_message_sent_test.php
@@ -0,0 +1,70 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+namespace logstore_xapi\core\group_message_sent\new_group_message_sent;
+
+defined('MOODLE_INTERNAL') || die();
+
+global $CFG;
+
+require_once($CFG->dirroot . '/admin/tool/log/store/xapi/tests/xapi_test_case.php');
+
+/**
+ * Unit test for group_message_sent event.
+ *
+ * @package   logstore_xapi
+ * @copyright Milt Reder <milt@yetanalytics.com>
+ * @license   https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class new_group_message_sent_test extends \logstore_xapi\xapi_test_case {
+
+    /**
+     * Retrieve the directory of the unit test.
+     *
+     * @return string
+     */
+    protected function get_test_dir() {
+        return __DIR__;
+    }
+
+    /**
+     * Retrieve the plugin type being tested.
+     *
+     * @return string
+     */
+    protected function get_plugin_type() {
+        return "core";
+    }
+
+    /**
+     * Retrieve the plugin name being tested.
+     *
+     * @return string
+     */
+    protected function get_plugin_name() {
+        return "course";
+    }
+
+    /**
+     * Appease auto-detecting of test cases. xapi_test_case has default test cases.
+     *
+     * @covers ::attempt_submitted
+     * @return void
+     */
+    public function test_init() {
+
+    }
+}
diff --git a/tests/core/group_message_sent/new_group_message_sent/statements.json b/tests/core/group_message_sent/new_group_message_sent/statements.json
new file mode 100644
index 000000000..b913c4494
--- /dev/null
+++ b/tests/core/group_message_sent/new_group_message_sent/statements.json
@@ -0,0 +1,76 @@
+[
+  {
+    "actor": {
+      "account": {
+        "homePage": "http://www.example.org",
+        "name": "1"
+      },
+      "name": "test_fullname"
+    },
+    "verb": {
+      "display": {
+        "en": "Sent"
+      },
+      "id": "http://activitystrea.ms/send"
+    },
+    "object": {
+      "id": "http://www.example.org/message?id=1",
+      "objectType": "Activity",
+      "definition": {
+        "name": {
+          "en": "test_message_subject"
+        },
+        "description": {
+          "en": "test_message_body"
+        },
+        "type": "http://id.tincanapi.com/activitytype/chat-message"
+      }
+    },
+    "context": {
+      "contextActivities": {
+        "grouping": [
+          {
+            "id": "http://www.example.org/group/index.php?id=1",
+            "objectType": "Activity",
+            "definition": {
+              "type": "https://xapi.edlm/profiles/edlm-lms/concepts/activity-types/group",
+              "name": {
+                "en": "test_name"
+              }
+            }
+          }
+        ],
+        "parent": [
+          {
+            "id": "http://www.example.org/course/view.php?id=1",
+            "definition": {
+              "type": "https://w3id.org/xapi/cmi5/activitytype/course",
+              "name": {
+                "en": "test_name"
+              }
+            }
+          }
+        ],
+        "category": [
+          {
+            "id": "http://www.example.org",
+            "definition": {
+              "type": "http://id.tincanapi.com/activitytype/lms",
+              "name": {
+                "en": "test_name"
+              }
+            }
+          }
+        ]
+      },
+      "extensions": {
+        "http://lrs.learninglocker.net/define/extensions/info": {
+          "event_function": "\\src\\transformer\\events\\core\\group_message_sent",
+          "event_name": "\\core\\event\\group_message_sent",
+          "http://moodle.org": "1.0.0",
+          "https://github.com/xAPI-vle/moodle-logstore_xapi": "0.0.0-development"
+        }
+      }
+    }
+  }
+]