You can save up to 10K contacts to a list.
On the People Search page select the contacts you would like to save to a list.
You can select the contacts manually by checking the checkboxes on the left side of the contact’s name.
If you would like to select ALL of the contacts from the search results, check the top left checkbox on the contact view (beneath the Total Count), and then click on Select All (the total number of contacts is mentioned).
Now click on the Add to List button on the top left side of the contacts view.
You can add these contacts to a saved list by selecting the relevant list presented or by entering the list’s name.
If you would like to save these contacts to a NEW list, click on New List at the bottom of the pane, enter the list’s name in the top box, and click on Enter.
When all of the contacts are saved to the list, you will receive a notification in the Notifications icon on the top right side of the screen.
You can click on the hyperlink to go to the list, or access the list through the Custom Lists section on the left navigation bar.