Through financial institutions Deutsche Bank and Goldman Sachs, Vivendi is selling 55m shares at between 60 and 61 each. The stock last closed at 62.5 and was trading at 59.80, down 4.3%, in mid-morning trading in Paris today.
The offering will enable Vivendi to meet its 2002 debt targets.
Vivendi, the former French utilities company previously called Generale-des-Eaux, has grown substantially in the last year to become one of the world's largest media companies under an aggressive strategy overseen by chief executive Jean Marie-Messier.
At the end of 2001, Vivendi announced it is paying £7bn for the entertainment assets of Barry Diller's USA Networks, a move which will give it an important foothold in the US.
Vivendi helped fund the sale by selling part of its stake in UK broadcaster BSkyB for £1bn.
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