Turin - Juventus shares soared by over 20% on the Milan stock exchange on Wednesday, the morning after Cristiano Ronaldo's incredible hat-trick rescued the Italian giants Champions League campaign.

The Portuguese superstar added a late penalty to a pair of headers for a 3-0 win on the night and 3-2 on aggregate over Atletico Madrid to seal a place in the quarter-finals.

The Turin club's shares jumped by 23% after the Milan stock exchange opened before dipping to 17.09% later in the morning.

In 90 minutes the five-time Ballon d'Or winner demonstrated why Juventus splashed out €100 million last summer to bring the Real Madrid star to Italy, in addition to his annual salary of €31 million.

"That's why Juventus bought me, to help them in games like this," the 34-year-old Ronaldo said after the game. 

The seven-time reigning Italian title-holders have not won the Champions League since 1996, and have finished runners-up twice in the past four seasons.