diff --git a/ara-tester-list.md b/ara-tester-list.md
index 2823005653..db9398f543 100644
--- a/ara-tester-list.md
+++ b/ara-tester-list.md
@@ -56,6 +56,7 @@ The usefulness of this page depends on testers sharing information and updates;
 | MiQ | Adtech & Managed service  | From 01.01.2024 | coming soon | privacysandbox@miqdigital.com |
 | KelkooGroup | Adtech services for affiliate marketing | From 01.12.2023 | | privacysandbox@kelkoogroup.com |
 | Quantcast | Demand-side platform (DSP) | Testing ongoing | | chrome-privacy-sandbox@quantcast.com |
+| Optable | Adtech services | Testing ongoing | | privacysandbox@optable.co | 
 
 ## Table - Publishers and Advertisers Interested in Testing or Early Adoption
 Companies who may be interested in participating in tests and early adoption opportunities provided by ad tech companies.