The shares on Paris' CAC 40 opened at 310.45 euros (266.42 pounds) and fell to 285.7 euros, their lowest since Feb. 12 in the opening minutes.

The stock then recovered most of the lost ground and were at 313.3 euros, down 0.1 percent, at 0939 GMT.

Turnover in the stock was unusually high, with almost 200,000 shares traded in the first 75 minutes after the opening bell, 28 percent of its 100-day average daily total.

LVMH and Euronext, which operates the CAC 40 stock exchange, were not immediately available for comment.

"It was probably a fat finger right at the start of trading," said a Paris-based trader.

"No one understood what happened. It was likely a mistake," said another trader.

(Reporting by Sudip Kar-Gupta and Blandine Henault in PARIS, Danilo Masoni in MILAN and Josephine Mason in LONDON, editing by Louise Heavens)