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Ardian becomes lead shareholder in Diot-Siaci

09/26/2025 by Linda

The Diot-Siaci Group, a specialist insurance and reinsurance broker and consulting group, has announced a major ownership restructuring, with Ardian, a private investment firm as lead financial shareholder.

Following exclusive negotiations, both companies have signed a definitive agreement regarding the Group’s new ownership structure.

The transaction will see Ardian significantly increase its stake in Diot-Siaci. Upon completion, Ardian will become the primary financial shareholder, joining forces with the Burrus Group, a long-term shareholder, and the management team.

The new capital structure will establish a joint control governance framework between both shareholders, ensuring a shared strategic direction for the company to support this ambitious new phase of growth.

The Group will continue to be Co-Chaired by Pierre Donnersberg and Christian Burrus, and led by Cédric Charpentier, Chief Executive Officer.

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Thibault Basquin, Co-head & CIO of Buyout and Member of the Executive Committee, Ardian, said: “We are thrilled to be joining forces with the Burrus Group, Pierre Donnersberg and the entire management team led by Cédric Charpentier to support Diot-Siaci in the next stage of its development. Together, we have ambitious plans to make Diot-Siaci the leading independent insurance and reinsurance brokerage group with European roots.”

Arian’s increased investment builds on its long-standing relationship with the Diot-Siaci Group, which began in 2015.

Through this new agreement Ardian will acquire the shares currently held by Ontario Teachers’ Pension Plan (Ontario Teachers’), Bpifrance, Cathay Capital and other minority shareholders.

Ardian’s complete backing will help Diot-Siaci accelerate its growth, especially in key areas such as major industrial risks, marine insurance, personal insurance, human resources consulting, credit insurance, international mobility, and reinsurance.

This expansion will focus on its main markets in Continental Europe, the United Kingdom, Asia, the Middle East, and Africa.

This collaboration strengthens the Group’s global capabilities and cements its standing among the world’s top industry leaders. The combined momentum of Diot-Siaci and Ardian’s expertise is set to significantly boost the Group’s long-term growth trajectory.

This transaction remains subject to approval by the relevant regulatory and competition authorities.

“In addition to the commitment from our Buyout fund, we have successfully raised more than €700 million in less than two months from institutional partners to co-invest in this deal, including several sovereign wealth funds and international investors. This demonstrates the confidence of these leading investors in Ardian’s ability to support blue-chip companies in their ambitious growth strategies,” Olivier Personnaz, Managing Director and Head of Buyout Equity Capital Markets, Buyout, Ardian, added.

The post Ardian becomes lead shareholder in Diot-Siaci appeared first on ReinsuranceNe.ws.

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Filed Under: Carrier, P&C Insurance

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