Can't find full list either, but it at least includes Bing and Google: https://support.startpage.com/hc/en-us/articles/4522435533844-What-is-the-relationship-be

Can't find full list either, but it at least includes Bing and Google: https://support.startpage.com/hc/en-us/articles/4522435533844-What-is-the-relationship-between-Startpage-and-your-search-partners-like-Google-and-Microsoft-Bing https://support.startpage.com/hc/en-us/articles/452243553384...