Agnelli S.P.A. owns Exor and Exor owns Juve, something like that
EDIT:
Main Exor S.p.A. shareholders as of 12 October 2015:
Company % of share capital
Giovanni Agnelli e C. S.a.p.az 51.87%
Exor S.p.A. 4.83%
Harris Associates LP 5.02%
Other shareholders 38.28%