diff --git a/CHANGELOG.md b/CHANGELOG.md
index 86615d2751..34c44c9468 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -45,6 +45,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Added
 
+- Xlsx reader supports MS x14 and xm extensions for dataValidations - [#388](https://github.com/PHPOffice/PhpSpreadsheet/issues/388)
 - HTML writer creates a generator meta tag - [#312](https://github.com/PHPOffice/PhpSpreadsheet/issues/312)
 - Support invalid zoom value in XLSX format - [#350](https://github.com/PHPOffice/PhpSpreadsheet/pull/350)
 - Support for `_xlfn.` prefixed functions and `ISFORMULA`, `MODE.SNGL`, `STDEV.S`, `STDEV.P` - [#390](https://github.com/PHPOffice/PhpSpreadsheet/pull/390)
diff --git a/src/PhpSpreadsheet/Reader/Xlsx.php b/src/PhpSpreadsheet/Reader/Xlsx.php
index 369497683e..77f520bd9a 100644
--- a/src/PhpSpreadsheet/Reader/Xlsx.php
+++ b/src/PhpSpreadsheet/Reader/Xlsx.php
@@ -1334,6 +1334,21 @@ public function load($pFilename)
                             }
 
                             if ($xmlSheet && $xmlSheet->dataValidations && !$this->readDataOnly) {
+                                // handle Microsoft extension if present
+                                if (isset ($xmlSheet->extLst, $xmlSheet->extLst->ext, $xmlSheet->extLst->ext['uri'])
+                                && $xmlSheet->extLst->ext['uri'] == "{CCE6A557-97BC-4b89-ADB6-D9C93CAAB3DF}" )
+                                {
+                                  // retreive MS extension data to create a node that matches expectations.
+                                  foreach ($xmlSheet->extLst->ext->children('x14', TRUE)->dataValidations->dataValidation as $item)
+                                  {
+                                    $node = $xmlSheet->dataValidations->addChild('dataValidation');
+                                    foreach ($item->attributes() as $attr)
+                                      $node->addAttribute($attr->getName(), $attr);
+                                    $node->addAttribute('sqref', $item->children('xm',TRUE)->sqref);
+                                    $node->addChild('formula1', $item->formula1->children('xm',TRUE)->f);
+                                  }
+                                }
+
                                 foreach ($xmlSheet->dataValidations->dataValidation as $dataValidation) {
                                     // Uppercase coordinate
                                     $range = strtoupper($dataValidation['sqref']);