Apparently, Yedioth Ahronoth and Hamad Books created in partnership, Intelligence - Publishing House which is also know as Yedioth Sfarim (Yedioth Books).
Back cover of PS has "Yediothsfarim" (Yedioth Books) in a url (no longer functional).
Copyright page has "Books in the Attic" and "Intelligence - Publishing House" founded by "Yedioth Ahronoth" and "Hamad Books".