Powerful analytical solutions that work the way you do


Arius is Milliman’s complete reserve analysis solution

Now you can have the tools you need to truly understand your business. Your team will get a more efficient analysis process and a deeper understanding of the underlying insurance exposure so you can make more informed business decisions.

Solution highlights

We’ve got the solution you need

Desktop reserving solution


Arius® is a complete solution for analyzing casualty reserves and estimating ultimate loss costs. It combines our industry-leading stochastic modeling tools with a robust suite of deterministic reserving tools and methods.

Arius adds reliability and efficiency to your analysis process, so your team can focus on the important issues in your business.

Enterprise reserving solution

Arius Enterprise

Manage your overall reserving and reporting process, increase efficiency, and improve the accuracy of your loss reserve estimates. Arius Enterprise® streamlines your entire P&C reserve analysis process.

reserving data management

Triangles on Demand

Save hours every quarter rolling up, preparing, and reconciling claim, expense, and premium detail to meet your increasingly tight deadlines. Triangles on Demand® (TOD) summarizes hundreds of millions of records into triangles of virtually any size and level of detail. Simply request your specific data sets from within Arius and all the resulting triangles appear in the system ready for you to use.

Milliman Claim Variability Benchmarks

Milliman Claim Variability Benchmarks™ (CVB) are new industry benchmarks to help assess the quality of stochastic unpaid claim distributions used for enterprise risk management and dynamic financial analysis, including correlation for aggregate distributions. The CVB also stochastically support deterministic ranges used for reserving.


What sets Arius solutions apart?

Ease of use

Startup time for most users is measured in hours, not weeks, thanks to Arius’ intuitive, user-configurable interface, and its extensive help in parameterizing even sophisticated models.


Arius conforms to the way your department works, not the other way around. Customize reports or exhibits based on what you need, and the system will manage them for you.

Track record

Arius’ heritage includes some of the industry’s leading reserving tools. It combines both proven reserving strategies as well as some of the latest actuarial thinking.

Speed & reliability

Arius sets the standard for speed and reliability. All deterministic calculations happen in real time, and simulations run hundreds of times faster than in spreadsheet models.


Milliman consultants have extensive experience using Arius, so we can provide the support you need, from basic training to a complete redesign of your reserving process.

Return on investment

Arius provides the shortest possible time to value thanks to fast implementation, ease of learning, and informative reporting.


Related consulting services

Arius consulting services


Contact an Arius expert

We’re passionate about partnering with people and working with new solutions to solve complex problems. Let’s chat about what’s going on with your business and how we can help.