FRANKFURT--German prosecutors in Stuttgart are investigating allegations of market manipulation at the supervisory board of Porsche SE (PAH3.XE), a prosecution spokesman said Tuesday.

In December, prosecutors filed charges against Porsche SE managers Wendelin Wiedeking and Holger Haerter for manipulating markets in the company's attempt to take over Volkswagen AG (VOW.XE).

The spokesman was responding to an online report by the weekly Der Spiegel magazine which said that the supervisory board is alleged to have violated trading laws during the failed takeover attempt.

A Porsche SE spokesman said the company is aware that state prosecutors have initiated an investigation.

In 2005, Porsche bought Volkswagen shares and attempted to take over the company via complex share options three years later. The move sparked high volatility in Volkswagen shares and losses for investors. The attempt failed, and Porsche was later sold to Volkswagen.

Last December, prosecutors said that from early March 2008 to October 2008, Porsche issued at least five statements denying its intention to raise its stake in Volkswagen to 75%.

Prosecutors say the statements were made after the executives decided to try to raise Porsche's stake and were already preparing for the move by purchasing buy options on ordinary and preference shares of Volkswagen.

The denials induced investors to sell or make short sales, which would benefit Porsche by lowering the share price ahead of the takeover, the prosecutor said.

Write to the Frankfurt Bureau at djnews.frankfurt@dowjones.com

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