The news will come as a big boost for the Basque outfit as all three are important first-team players at the Anoeta.
Spanish international defender Aranzabal, 30, has put pen-to-paper on a deal that ties him to the club until the summer of 2006.
Jauregi, a 29-year-old midfielder, has agreed a similar deal, while youth product Aranburu, 24, has agreed to stay until 2007.
Sociedad have also reserved the option to extend each of the player's contracts by a further year should they wish.
