diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3c83655..fb22e9c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,12 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog][keepachangelog] and this project adheres to [Semantic Versioning][semver].
 
+## Unreleased
+
+### Added
+
+- Store references data in memory after first open
+
 ## v3.10.0
 
 ### Added
diff --git a/sdk/php/src/ReferencesData/StaticReference.php b/sdk/php/src/ReferencesData/StaticReference.php
index b8ddfc9..2d41f2b 100644
--- a/sdk/php/src/ReferencesData/StaticReference.php
+++ b/sdk/php/src/ReferencesData/StaticReference.php
@@ -16,6 +16,13 @@ class StaticReference implements StaticReferenceInterface
      */
     protected $file_path;
 
+    /**
+     * Source data.
+     *
+     * @var mixed[]|object[]|object|null
+     */
+    protected $data;
+
     /**
      * Create a new reference instance.
      *
@@ -68,9 +75,10 @@ public function getFilePath(): string
      */
     public function getData(bool $as_array = true, int $options = 0)
     {
-        /** @var mixed[]|object[]|object $data */
-        $data = \json_decode((string) \file_get_contents($this->file_path), $as_array, 512, $options);
+        if (! isset($this->data)) {
+            $this->data = \json_decode((string) \file_get_contents($this->file_path), $as_array, 512, $options);
+        }
 
-        return $data;
+        return $this->data;
     }
 }
diff --git a/sdk/php/src/StaticReferencesData.php b/sdk/php/src/StaticReferencesData.php
index a2f6892..792be5a 100644
--- a/sdk/php/src/StaticReferencesData.php
+++ b/sdk/php/src/StaticReferencesData.php
@@ -5,9 +5,27 @@
 namespace AvtoDev\StaticReferencesData;
 
 use AvtoDev\StaticReferencesData\ReferencesData\StaticReference;
+use AvtoDev\StaticReferencesData\ReferencesData\StaticReferenceInterface;
 
 class StaticReferencesData
 {
+    /**
+     * @var array<string, StaticReferenceInterface>
+     */
+    private static $references;
+
+    /**
+     * Path to files with static data. Should be unique.
+     */
+    private const
+        CADASTRAL_DISTRICTS_PATH = '/data/cadastral/districts.json',
+        SUBJECT_CODES_PATH = '/data/subject/codes.json',
+        VEHICLE_FINE_ARTICLES_PATH = '/data/vehicle/fine/articles.json',
+        VEHICLE_REGISTRATION_ACTIONS_PATH = '/data/vehicle/registration/actions.json',
+        VEHICLE_REPAIR_METHODS_PATH = '/data/vehicle/repair/methods.json',
+        VEHICLE_CATEGORIES_PATH = '/data/vehicle/categories.json',
+        VEHICLE_TYPES_PATH = '/data/vehicle/types.json';
+
     /**
      * Get root references directory path.
      *
@@ -27,11 +45,13 @@ public static function getRootDirectoryPath(?string $additional_path = null): st
     /**
      * Get cadastral districts reference.
      *
-     * @return StaticReference
+     * @return StaticReferenceInterface
      */
-    public static function cadastralDistricts(): StaticReference
+    public static function cadastralDistricts(): StaticReferenceInterface
     {
-        return new StaticReference(static::getRootDirectoryPath('/data/cadastral/districts.json'));
+        return static::$references[static::CADASTRAL_DISTRICTS_PATH]
+            ?? static::$references[static::CADASTRAL_DISTRICTS_PATH] =
+                new StaticReference(static::getRootDirectoryPath(static::CADASTRAL_DISTRICTS_PATH));
     }
 
     /**
@@ -39,60 +59,72 @@ public static function cadastralDistricts(): StaticReference
      *
      * @link <https://bit.ly/2GB3bda>
      *
-     * @return StaticReference
+     * @return StaticReferenceInterface
      */
-    public static function subjectCodes(): StaticReference
+    public static function subjectCodes(): StaticReferenceInterface
     {
-        return new StaticReference(static::getRootDirectoryPath('/data/subject/codes.json'));
+        return static::$references[static::SUBJECT_CODES_PATH]
+            ?? static::$references[static::SUBJECT_CODES_PATH] =
+                new StaticReference(static::getRootDirectoryPath(static::SUBJECT_CODES_PATH));
     }
 
     /**
      * Get vehicle fine articles reference.
      *
-     * @return StaticReference
+     * @return StaticReferenceInterface
      */
-    public static function vehicleFineArticles(): StaticReference
+    public static function vehicleFineArticles(): StaticReferenceInterface
     {
-        return new StaticReference(static::getRootDirectoryPath('/data/vehicle/fine/articles.json'));
+        return static::$references[static::VEHICLE_FINE_ARTICLES_PATH]
+            ?? static::$references[static::VEHICLE_FINE_ARTICLES_PATH] =
+                new StaticReference(static::getRootDirectoryPath(static::VEHICLE_FINE_ARTICLES_PATH));
     }
 
     /**
      * Get vehicle registration actions reference.
      *
-     * @return StaticReference
+     * @return StaticReferenceInterface
      */
-    public static function vehicleRegistrationActions(): StaticReference
+    public static function vehicleRegistrationActions(): StaticReferenceInterface
     {
-        return new StaticReference(static::getRootDirectoryPath('/data/vehicle/registration/actions.json'));
+        return static::$references[static::VEHICLE_REGISTRATION_ACTIONS_PATH]
+            ?? static::$references[static::VEHICLE_REGISTRATION_ACTIONS_PATH] =
+                new StaticReference(static::getRootDirectoryPath(static::VEHICLE_REGISTRATION_ACTIONS_PATH));
     }
 
     /**
      * Get vehicle repair methods reference.
      *
-     * @return StaticReference
+     * @return StaticReferenceInterface
      */
-    public static function vehicleRepairMethods(): StaticReference
+    public static function vehicleRepairMethods(): StaticReferenceInterface
     {
-        return new StaticReference(static::getRootDirectoryPath('/data/vehicle/repair/methods.json'));
+        return static::$references[static::VEHICLE_REPAIR_METHODS_PATH]
+            ?? static::$references[static::VEHICLE_REPAIR_METHODS_PATH] =
+                new StaticReference(static::getRootDirectoryPath(static::VEHICLE_REPAIR_METHODS_PATH));
     }
 
     /**
      * Get vehicle categories reference.
      *
-     * @return StaticReference
+     * @return StaticReferenceInterface
      */
-    public static function vehicleCategories(): StaticReference
+    public static function vehicleCategories(): StaticReferenceInterface
     {
-        return new StaticReference(static::getRootDirectoryPath('/data/vehicle/categories.json'));
+        return static::$references[static::VEHICLE_CATEGORIES_PATH]
+            ?? static::$references[static::VEHICLE_CATEGORIES_PATH] =
+                new StaticReference(static::getRootDirectoryPath(static::VEHICLE_CATEGORIES_PATH));
     }
 
     /**
      * Get vehicle types reference.
      *
-     * @return StaticReference
+     * @return StaticReferenceInterface
      */
-    public static function vehicleTypes(): StaticReference
+    public static function vehicleTypes(): StaticReferenceInterface
     {
-        return new StaticReference(static::getRootDirectoryPath('/data/vehicle/types.json'));
+        return static::$references[static::VEHICLE_TYPES_PATH]
+            ?? static::$references[static::VEHICLE_TYPES_PATH] =
+                new StaticReference(static::getRootDirectoryPath(static::VEHICLE_TYPES_PATH));
     }
 }