CRT-Eligible Profile Summary

CAS 2023-R08 Structural Overview (Group 1) Reference Pool October 2022 - December 2022 (Loans with REMIC election) Group 1 Loans Original LTV 60.01 - 80.00% Class 1A-H 94.70% thick 5.30% credit support (initial) 5.30% credit support (required) Class 1M-1 1.55% thick 3.75% credit support Class 1M-2 1.15% thick 2.60% credit support Class 1B-1 1.05% thick 1.55% credit support Class 1B-2H 0.55% thick Class 1M-1H (5.00% vertical slice) Class 1M-2H (5.00% vertical slice) Class 1B-1H (36.95% vertical slice) 1.00% credit support Class 1B-3H 1.00% thick 0.00% credit support All H tranches are reference tranches only and will not be issued • Loans acquired in October 2022 - December 2022 and securitized into MBS pools • issued in October 2022 - June 2023 Reference Pool contains only 60.01-80.00% LTV loans 20-year legal final maturity; Fannie Mae optional call starting in year 5 • Fannie Mae optional 10% clean up call Notes are par-priced uncapped SOFR-based floaters Minimum credit enhancement to unlock unscheduled and scheduled principal is 5.30% Delinquency test trigger must be satisfied to unlock unscheduled and scheduled principal • Credit events are based on actual losses 1M-2 class and 1B-1 class will offer exchange features with rated exchangeable notes • The Class 1M-1 and 1M-2 Notes will be ERISA eligible • All classes are issued as REMICS and treated as debt-for-tax • Fannie Mae will retain 100% of the 1B-2H and 1B-3H tranches and at least 5.00% of all offered tranches. Retention is in line with requirements of Regulation (EU) 2017/2402 Section 5.1(d) and Article 6.3(a) of the UK Securitization Regulation regarding retention of material net economic interest 21 © 2024 Fannie Mae

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