bigonion:
I stand corrected.
Porsche SE purportedly will make moderate sized acquisitions and investments in the auto technology area. Probably this means some or several key componentry suppliers. Porsche receives a lot of dividends and, by virtue of their misguided attempt to take control of VW in 2008 they have lots of embedded tax losses, so finding some decent profit streams to offset these has some value. But, for the most part, it's how Piech controls VW + Porsche with really a modest minority of the share capital. Still find it amazing he pulled it off.
I guess this is how Piech wanted to handle the whole VW/Porsche stuff to begin with but Mr. Wiedeking and his financial guy had a more direct approach in mind, which may have succeeded at some point if the economic crisis wouldn't have come up. Still...Piech's approach seems to be more subtle, less controversial and it doesn't offend the current employees and shareholders of the VW Group too much.
Piech is really a genius...not sure if he is an evil or a good one though. 
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RC (Germany) - Rennteam Editor Porsche Panamera Turbo S, Cayenne GTS (958), 991 Turbo S (Oct. 5th), BMW X3 35d (2013)