
The Challenge: Anticipating Basel IV Capital Impacts
The Basel IV (CRR3) transition requires European banking institutions to thoroughly revise their RWA (Risk-Weighted Assets) calculation methods. For international banks, the challenge is threefold: accurately anticipate capital impacts on complex credit portfolios, compare approaches (standard, IRB-F, IRB-A) for each business segment, and prepare discussions with the supervisor (ECB) on robust and defensible grounds.
For this large French banking group, the challenge was to have a tool capable of simulating these impacts at the consolidated portfolio level — several million lines, multiple geographical areas, multiple segments — without being locked into an opaque proprietary tool or requiring extensive IT projects.

Our approach: a white-box Basel IV simulator, designed for seamless integration
Prime Analytics designed and deployed a custom Basel IV simulator, in Plug & Play mode, without intrusion or technological dependence. Four principles guided its design:
1. Industrial Performance
1 million lines processed in 10 minutes, capable of handling a very large consolidated portfolio.
2. White Box Approach
Entirely transparent and auditable code, calculation rules, and documentation. No black box between business operations and decision-making.
3. Parametric Flexibility
Simulations by portfolio, segment, or globally, with flexible adjustment of key parameters (PD, LGD, EAD) to produce robust scenarios.
4. Multi-format Output
Output available in Excel, JSON, XML, Power BI or Tableau, depending on business uses (Risk, Finance, Management, IT teams).
Design and deployment of a custom Basel IV RWA simulator: plug & play, white box, multi-format.
Compatible with any banking IT system, operable autonomously by your teams.
Results: €120 billion simulated, secured methodological choices
The project delivered a comprehensive simulation of the Basel IV impact on 120 billion euros of capital. Risk teams now compare RWA methods segment by segment and select the most efficient one for each portfolio. They test the robustness of scenarios under different assumptions and visualize geographical and sectoral impacts via interactive dashboards. The generated figures, which are auditable and reproducible, secure exchanges with the ECB.
Prime Analytics' contribution was central to achieving the objectives of this mission. “With Prime Analytics, we were able to get this project up and running in just a few days. Their knowledge of Alteryx and their technical expertise allowed us to move quickly and obtain greater precision than we expected. This model has made us gain in reliability, speed and autonomy.”

Key project takeaways
€120 billion of capital simulated under Basel IV standards
A Plug & Play, non-intrusive Basel IV simulator, compatible with any banking IT system
1 million lines processed in 10 minutes thanks to the expertise of Prime Analytics
White-box approach: fully auditable code, calculation rules, and documentation
Multi-format reporting for Risk, Finance, Management, and IT business teams on Alteryx and data management