The Vivendi logo is pictured at the main entrance of the entertainment-to-telecoms conglomerate headquarters in Paris

The Vivendi logo is pictured at the main entrance of the entertainment-to-telecoms conglomerate headquarters in Paris, March 10, 2016. REUTERS/Charles Platiau

MILAN (Reuters) – Italy’s communications authority (AGCOM) is set to decide on April 18 whether stake building by France’s Vivendi in Italian broadcaster Mediaset breaches Italian antitrust regulations, a source close to the matter said on Tuesday.

AGCOM opened an investigation into the French media company on Dec. 21, after Mediaset filed a complaint regarding Vivendi rapidly accumulating a 28.8 percent share.

The source said the board of AGCOM started a discussion on its findings in the Mediaset-Vivendi case on Tuesday and was likely to reach a conclusion by April 18.

The authority has to decide whether Vivendi, which also holds a 24 percent share in phone incumbent Telecom Italia , breaches a national law which prevents companies from having an excessive share in both the domestic telecommunications and media markets.

Vivendi declined to comment.

Reporting by Francesca Piscioneri,; Additional reporting by Gwenaelle Barzic in Paris,; Writing by Giulia Segreti,; Editing by Giselda Vagnoni

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