CASPreliminaryACAS track
CAS MAS-I Pass Rates
Exam MAS-I: Modern Actuarial Statistics I
43.4%
Spring 2026 raw pass rate
−6.8 ptsvs 50.2% in Winter 2026
- All-time high
- 55.3%Spring 2024
- All-time low
- 30.6%Fall 2018
- Average
- 45.7%across 18 sittings
- Std. deviation
- 7.2 ptssitting to sitting
- Candidates tracked
- 14,9012018 to 2026
- Sittings
- 18all counted
Raw pass rate
Every MAS-I sitting
| Sitting | Candidates | Passed | Raw rate | Effective rate |
|---|---|---|---|---|
| Spring 2026 | 751 | 326 | 43.4% | 48.7% |
| Winter 2026 | 418 | 210 | 50.2% | 55.7% |
| Fall 2025 | 847 | 383 | 45.2% | 50.2% |
| Summer 2025 | 446 | 223 | 50.0% | 51.4% |
| Spring 2025 | 852 | 363 | 42.6% | 46.2% |
| Fall 2024 | 872 | 369 | 42.3% | 48.5% |
| Spring 2024 | 932 | 515 | 55.3% | 60.2% |
| Fall 2023 | 1,015 | 481 | 47.4% | 49.7% |
| Spring 2023 | 941 | 507 | 53.9% | 58.0% |
| Fall 2022 | 845 | 440 | 52.1% | 55.1% |
| Spring 2022 | 816 | 415 | 50.9% | 64.8% |
| Fall 2021 | 791 | 437 | 55.2% | 62.4% |
| Spring 2021 | 866 | 371 | 42.8% | 50.3% |
| Fall 2020 | 1,224 | 541 | 44.2% | 52.3% |
| Fall 2019 | 992 | 398 | 40.1% | 47.3% |
| Spring 2019 | 948 | 295 | 31.1% | 36.4% |
| Fall 2018 | 846 | 259 | 30.6% | 36.4% |
| Spring 2018 | 499 | 229 | 45.9% | 50.3% |
About MAS-I
MAS-I covers probability models, statistics, and extended linear models, and replaced Exam S when the CAS restructured its preliminary exams in 2018. It is offered twice a year, with additional summer and winter sittings added in 2025.
Data: Casualty Actuarial Society official exam statistics, 2018 to 2026. Last updated July 5, 2026.