After viewing your initial search results page (Finder or Raiser) you can simply create a new list.
Simply select the company(s) that is relevant to your search, then click on the 'Add # to list' button to save your selected company(s) to a list. Clicking on 'Select All' on the left-hand side will include all results displayed on the current page.
Once you click on the 'Add # to list' button, a window will open and prompt you to select an existing list or create a new one.