Aside from his former position as chairman of VW's executive board, Winterkorn has also served (and continues to serve at present) as chairman of the supervisory boards of Audi, truck manufacturer Scania (which is owned by VW), and the group's Truck & Bus division (of which Scania is part alongside Man). He's also the chief executive of Volkswagen's largest stakeholder Porsche SE, having taken up the position after the Porsche/Piëch family enterprise acquired its majority stake in the group that also subsumed the sports car manufacturer.
In what could prove a strong indicator of things to come, and according to the report from Reuters, Winterkorn was not present at a recent meeting of Audi's board. In his place, the meeting was presided over by deputy chairman Berthold Huber. The former labor leader also served as interim chairman of the VW board after Ferdinand Piëch's departure but before CFO Hans Dieter Potsch was named to the post.
The companies in question have yet to make any announcements regarding Winterkorn's remaining positions, or confirm the reports regarding his future. However parties close to the automaker and its owners reportedly expect the resignations from those positions to come as well before the end of the month, if not before the week is out.