Lyon said the fee for Lacazette, who recently broke into the French national team, was the highest ever achieved by the club in a transfer.
Olympique Lyon shares were up 1.3 percent in early trading.
The French soccer club, which won the last of its seven Ligue 1 championship titles in 2008, first listed on the Paris stock market in 2007.
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(Reporting by Sudip Kar-Gupta; Editing by Keith Weir)
