Abu Dhabi sovereign wealth fund Mubadala more than halved its shareholding in Italian bank UniCredit as the holder of about 6% of the world’s oil reserves sells stakes in overseas assets.

UniCredit said hackers accessed about 400,000 client bank accounts in Italy, taking biographical and loan data in one of the biggest breaches in Europe to date.

Italy’s bond markets were rocked by the Brexit vote amid reports Rome is considering injecting capital into some lenders battered by a fresh selloff.