The Diot-Siaci Group, an independent insurance and reinsurance consulting and brokerage group, has finalised its new ownership structure following the signing of the agreement on 6 August 2025.
In September 2025, Diot-Siaci initially announced that it had signed a definitive agreement with Ardian, a private investment firm, to significantly increase Ardian’s stake in the Group, making it the primary financial shareholder.
The new capital structure is accompanied by the introduction of joint control governance between Ardian and the Burrus Group, intended to support this next phase of growth.
With this closing, Cathay Capital is selling its minority stake of approximately 5% in the Group’s capital, which it has held since 2021 following the merger between Diot-LSN and Siaci Saint Honoré.
The Group will continue to be co-chaired by Pierre Donnersberg and Christian Burrus, with Cédric Charpentier remaining as Chief Executive Officer.
Since 2021, the Diot-Siaci Group has strengthened its position as a leader in corporate insurance and reinsurance consulting and brokerage in France and Europe, while expanding its international footprint across Asia, the Middle East, and Africa.
Bruno Bézard, Managing Partner at Cathay Capital, said, “Cathay Capital is proud to have supported Diot-Siaci’s international growth as an active minority shareholder alongside the founders and management, and leading institutional investors (Ontario Teachers’ Pension Plan Board, Bpifrance, and Mubadala). We are delighted with the success of this transaction and are confident that the Group will continue on its growth trajectory under its new shareholding structure.”
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