Cookie Name Used by Description
__utma Google Analytics Stores the amount of visits of a user, the time of their first visit, the previous visit, and the current visit. It does not contain any personal information and is used only for analytical purposes.  
__utmz Google Analytics This performance cookie stores where a user came from (eg. search engine, search keyword, link).
_ga and _gid Google Analytics Used to distinguish between website users in Google Analytics.
_gat_UA-XXXXXXXX-X (where the Xs are replaced by the Google Analytics ID number) Google Analytics Used to moderate calls to the Google Analytics service.
__unam ShareThis Set as part of the ShareThis service and monitors "click-stream" activity, e.g. web pages viewed, navigation from page to page, time spent on each page etc. The ShareThis service only identifies a user if they have separately signed up with ShareThis for a ShareThis account and given them consent. Checks how long you stay on a site: when a visit starts, and ends. It does not contain any personal information and is used only for analytical purposes.
cc_cookie_accept Website Stores whether the user has accepted the cookie message or not.
ToggleStatus Website Stores whether the user has hidden or shown the contacts filter search.
ASP.NET_SessionId Website Used for authenticating a user's session after logging in. Closes when you exit the browser.
ARRAffinity Website Tells our infrastructure which server to handle the request.
MemberLoggedIn Website A binary flag which stores whether a user is logged in or not.
ai_session and ai_user Website Tracks users as they navigate the website predominately for infrastructure performance insights.
DisplayName Website Keeps track of a donors preference to show their name during a Direct Debit.