diff --git a/vendor/magento/module-negotiable-quote/Model/Plugin/Quote/UpdateNegotiableQuotePlugin.php b/vendor/magento/module-negotiable-quote/Model/Plugin/Quote/UpdateNegotiableQuotePlugin.php
new file mode 100644
index 000000000000..5d733bcc0fd2
--- /dev/null
+++ b/vendor/magento/module-negotiable-quote/Model/Plugin/Quote/UpdateNegotiableQuotePlugin.php
@@ -0,0 +1,97 @@
+<?php
+/**
+ * ADOBE CONFIDENTIAL
+ *
+ * Copyright 2025 Adobe
+ * All Rights Reserved.
+ *
+ * NOTICE: All information contained herein is, and remains
+ * the property of Adobe and its suppliers, if any. The intellectual
+ * and technical concepts contained herein are proprietary to Adobe
+ * and its suppliers and are protected by all applicable intellectual
+ * property laws, including trade secret and copyright laws.
+ * Dissemination of this information or reproduction of this material
+ * is strictly forbidden unless prior written permission is obtained
+ * from Adobe.
+ */
+declare(strict_types=1);
+
+namespace Magento\NegotiableQuote\Model\Plugin\Quote;
+
+use Magento\Framework\Exception\CouldNotSaveException;
+use Magento\Framework\Exception\InputException;
+use Magento\Quote\Model\QuoteRepository\SaveHandler;
+use Magento\Quote\Api\Data\CartInterface;
+use Magento\NegotiableQuote\Model\NegotiableQuoteRepository;
+use Magento\NegotiableQuote\Api\Data\NegotiableQuoteInterface;
+
+class UpdateNegotiableQuotePlugin
+{
+    /**
+     * @param NegotiableQuoteRepository $negotiableQuoteRepository
+     */
+    public function __construct(
+        private readonly NegotiableQuoteRepository $negotiableQuoteRepository
+    ) {
+    }
+
+    /**
+     * Update negotiable quote items on quote save.
+     *
+     * @param SaveHandler $subject
+     * @param CartInterface $quoteResult
+     * @param CartInterface $quote
+     * @throws CouldNotSaveException
+     * @throws InputException
+     * @SuppressWarnings(PHPMD.UnusedFormalParameter)
+     */
+    public function afterSave(SaveHandler $subject, CartInterface $quoteResult, CartInterface $quote)
+    {
+        if ($quote->getIsActive()) {
+            return $quoteResult;
+        }
+
+        $negotiableQuoteToUpdate = $this->getNegotiableQuoteToBeUpdated($quote);
+        if (empty($quote->getUpdatedAt()) || !$negotiableQuoteToUpdate) {
+            return $quoteResult;
+        }
+
+        if (!method_exists($negotiableQuoteToUpdate, 'getSnapshot') ||
+            empty($negotiableQuoteToUpdate->getSnapshot())
+        ) {
+            return $quoteResult;
+        }
+
+        $snapshot = json_decode($negotiableQuoteToUpdate->getSnapshot(), true);
+        if (empty($snapshot)) {
+            return $quoteResult;
+        }
+
+        $snapshot['quote']['updated_at'] = $quote->getUpdatedAt();
+        $negotiableQuoteToUpdate->setSnapshot(json_encode($snapshot));
+        $this->negotiableQuoteRepository->save($negotiableQuoteToUpdate);
+
+        return $quoteResult;
+    }
+
+    /**
+     * Return negotiable quotes that needs to be updated.
+     *
+     * @param CartInterface $quote
+     *
+     * @return NegotiableQuoteInterface|bool $negotiableQuoteToUpdate
+     */
+    private function getNegotiableQuoteToBeUpdated(CartInterface $quote)
+    {
+        $negotiableQuoteToUpdate = false;
+        $extensionAttributes = $quote->getExtensionAttributes();
+
+        if ($extensionAttributes && $extensionAttributes->getNegotiableQuote()) {
+            $negotiableQuoteToUpdate = $extensionAttributes->getNegotiableQuote();
+            if (!$negotiableQuoteToUpdate->getQuoteId() && $negotiableQuoteToUpdate->getIsRegularQuote()) {
+                $negotiableQuoteToUpdate->setQuoteId($quote->getId());
+            }
+        }
+        return $negotiableQuoteToUpdate;
+    }
+}
diff --git a/vendor/magento/module-negotiable-quote/etc/di.xml b/vendor/magento/module-negotiable-quote/etc/di.xml
index 256ea510cd2b..51c0f122ab95 100644
--- a/vendor/magento/module-negotiable-quote/etc/di.xml
+++ b/vendor/magento/module-negotiable-quote/etc/di.xml
@@ -515,4 +515,7 @@
             </argument>
         </arguments>
     </type>
+    <type name="Magento\Quote\Model\QuoteRepository\SaveHandler">
+        <plugin name="update-negotiable-quote" type="Magento\NegotiableQuote\Model\Plugin\Quote\UpdateNegotiableQuotePlugin"/>
+    </type>
 </config>