Sébastien COSME

Senior Expert

Sébastien joined Detralytics in October 2022. His area of expertise is P&C insurance. He has been working in this business line since 2011, notably for 7 years at AXA (Belgium) and 3 years at Belfius Insurance (Belgium).

From 2015 to 2018, he was in charge of the technical pricing team at AXA for personal products (car and property insurance) but also for partnerships on less common risks, in line with the profitability targets set by the management. In this context, he has increased the exchange of best practices within the team and with other European entities.

At the beginning of 2019, he took over responsibility for Non-life Risk Management for a few months. There he challenged the calculations of P&C technical provisions as a second line, both for AXA Belgium and for subsidiaries such as Ardenne Prévoyante and Yuzzu (formerly Touring Assurances). The software used was IBNRS.

Between 2019 and 2022, he was responsible for technical and commercial new business pricing at Belfius Insurance.

Since 2015, Sébastien has managed teams of 4 to 5 actuaries. During this time, he was able to sharpen his managerial skills and other soft skills. He has the autonomy and flexibility required for the mission.


Master’s degree in Actuarial Sciences and in Mathematics


French, English, Dutch


MS office
SAS, R, Emblem (solution Willis Towers Watson)


Pricing, Reserving, Machine Learning, P&C, Health insurance, Reinsurance, People Management