Porsche AG has increased its shareholding in Bertrandt AG, Ehningen, by almost 4% to nearly 29%, buying the shares from the ownership Bertrandt chairman Dietmar Bichler and his family.

Bertrandt is an engineering services and parts supplier to the automotive and aerospace industries. Its products range from the development of single components and complex modules through to the supply of complete 'solutions'.

Bichler will continue to own shares in Bertrandt AG.

"The transaction has no relation to my activity as Chairman of the Executive Board," he said in a statement, adding the management and independence of the company would remain intact.

Porsche finance and IT head Lutz Meschke said the car maker had no intention to acquire any further voting rights and would continue to exert no influence on the executive or supervisory boards of Bertrandt "nor would aspire to any other changes".

Porsche holds Bertrandt as an investment under its financial assets, the automaker added.