diff --git a/specs/abtesting-v3/common/parameters.yml b/specs/abtesting-v3/common/parameters.yml
index 69f315e3da6..409e52e433b 100644
--- a/specs/abtesting-v3/common/parameters.yml
+++ b/specs/abtesting-v3/common/parameters.yml
@@ -38,6 +38,12 @@ updatedAt:
   description: Date and time when the A/B test was last updated, in RFC 3339 format.
   example: 2023-06-15T15:06:44.400601Z
 
+stoppedAt:
+  type: string
+  description: Date and time when the A/B test was stopped, in RFC 3339 format.
+  example: 2023-06-15T15:06:44.400601Z
+  nullable: true
+
 scheduledAt:
   type: string
   description: Date and time when the A/B test is scheduled to start, in RFC 3339 format.
diff --git a/specs/abtesting-v3/common/schemas/ABTest.yml b/specs/abtesting-v3/common/schemas/ABTest.yml
index 0245da7a15f..43826b372f0 100644
--- a/specs/abtesting-v3/common/schemas/ABTest.yml
+++ b/specs/abtesting-v3/common/schemas/ABTest.yml
@@ -18,6 +18,8 @@ ABTest:
       $ref: '../parameters.yml#/createdAt'
     endAt:
       $ref: '../parameters.yml#/endAt'
+    stoppedAt:
+      $ref: '../parameters.yml#/stoppedAt'
     name:
       $ref: '../parameters.yml#/name'
     status:
diff --git a/specs/abtesting/common/parameters.yml b/specs/abtesting/common/parameters.yml
index 41ae614dca3..f3de1ffade9 100644
--- a/specs/abtesting/common/parameters.yml
+++ b/specs/abtesting/common/parameters.yml
@@ -38,6 +38,12 @@ updatedAt:
   description: Date and time when the A/B test was last updated, in RFC 3339 format.
   example: 2023-06-15T15:06:44.400601Z
 
+stoppedAt:
+  type: string
+  description: Date and time when the A/B test was stopped, in RFC 3339 format.
+  example: 2023-06-15T15:06:44.400601Z
+  nullable: true
+
 scheduledAt:
   type: string
   description: Date and time when the A/B test is scheduled to start, in RFC 3339 format.
diff --git a/specs/abtesting/common/schemas/ABTest.yml b/specs/abtesting/common/schemas/ABTest.yml
index 944c180fb0d..c567cafcdb4 100644
--- a/specs/abtesting/common/schemas/ABTest.yml
+++ b/specs/abtesting/common/schemas/ABTest.yml
@@ -79,6 +79,8 @@ ABTest:
       $ref: '../parameters.yml#/createdAt'
     endAt:
       $ref: '../parameters.yml#/endAt'
+    stoppedAt:
+      $ref: '../parameters.yml#/stoppedAt'
     name:
       $ref: '../parameters.yml#/name'
     status: