# DEAG leadership transition

> Live situation record from CLSTR: https://clstr.news/situations/deag-leadership-transition
> Updated: 2026-09-29T14:19:29.000Z. Sources: 8. Developments: 2.

DEAG Deutsche Entertainment AG announced a leadership transition involving Markus Breitenecker. Breitenecker is scheduled to join the Executive Board on November 1, 2026, and will acquire a shareholding in the company.

He is set to succeed Detlef Kornett as Chairman of the Executive Board once Kornett’s contract expires at the end of 2026. Kornett, who most recently served as Co-CEO and Chairman, led the group to a record revenue of approximately EUR 490 million in the 2025 financial year. Breitenecker, formerly the Chief Operating Officer at ProSiebenSat.1 Media SE, is expected to focus on international growth and market expansion.

## Timeline

### 2026-09-29: DEAG appoints Markus Breitenecker as Chairman

Markus Breitenecker will succeed Detlef Kornett as Chairman of the Executive Board at DEAG Deutsche Entertainment AG in November 2026, focusing on international growth.

6 sources. https://clstr.news/cluster/centrum-development-gmbh-enters-insolvency-proceedings-in-dsseldorf

### 2026-09-29: Grünbeck AG expands executive board and appoints new CEO

Grünbeck AG is expanding its executive board to three members effective January 2027, appointing Dr. Günter Stoll as CEO alongside Sandra Stricker and Harald Wiedenmann.

2 sources. https://clstr.news/cluster/grnbeck-ag-expands-executive-board-and-appoints-new-ceo

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Cite as: DEAG leadership transition. CLSTR, https://clstr.news/situations/deag-leadership-transition