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Juventus shares popped after it was reported that the side is close to signing Real Madrid superstar Cristiano Ronaldo for €100 million ($US117 million).

Ronaldo’s signing was confirmed and shares rose even further, rising almost 40% in trading in Germany.

Follow Juventus’ stock price in real time here.

Shares of Italy’s most successful, best-known soccer team,Juventus, surged on Tuesday after it was confirmed that the side has signed Real Madrid superstar Cristiano Ronaldo for around 100 million euros ($US117 million).

Spanish news outlet La Sexta reported earlier that a deal for Ronaldo is now almost done, and Sky News said that Juventus’ president, Andrea Agnelli, has flown to the Greek island of Kalamata – where Ronaldo is on holiday – to hold talks with the star. Ronaldo’s move was then confirmed by Juventus later in the afternoon.

Ronaldo was Real Madrid’s top all-time goal scorer, with 451 goals since moving there in 2009. He has won five Ballons d’Or – the most prestigious individual trophy in world soccer – and is arguably the greatest player in the history of the sport.

News of the developing transfer, which was first rumoured last week, sent Juventus shares skyward. Once Ronaldo’s transfer was confirmed, Juventus’ Stuttgart traded shares rose by almost 40%, hitting €1.12, as the chart below shows:

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