Your personal information is not shared with any third party unless you are making a payment through the website, in which case it is shared with the payment processor.
When you submit a form on the website, the information that you’ve entered is collected in order to provide website features or to communicate with you. Your IP address and browser version are also collected as part of a broader effort to reduce spam sent through the website forms.
When you subscribe, a cookie with your subscriber ID is saved to your browser, and the server reads it to determine when you subscribed. This is used to display notifications of updates since you subscribed. The notifications that you have viewed, as well as the pages you have visited, are only saved to your own browser and viewable by you.