Fannie Mae and Freddie Mac are enhancing their Mortgage-Backed Security (MBS) disclosures to provide additional transparency into its Single-Family Green MBS Program. The new pool-level attributes will be included in the MBS Intraday Security and Security Supplemental Issuance Files beginning with March 2024 issuances. The MBS Monthly Security and Security Supplemental Files published March 6, 2024, will include these new attributes for all active outstanding Green MBS. The new security level attribute and new stratifications for the Green Programs are: • Energy Rating Index Stratification: The share of loans secured by properties scored using eligible energy rating indices by loan count and unpaid principal balance (UPB). • Green Indicator: The indicator denoting whether the security is a labeled Green Bond secured by loans that are eligible per Fannie Mae’s or Freddie Mac’s Green Bond Framework. • Green Program Criteria Stratification: The share of loans secured by properties with eligible energy efficiency program(s), including Green Building Certifications, Energy Rating Indices, and Renewable Energy sources, by loan count and UPB. • Green Building Certification Stratification: The share of loans secured by properties certified to eligible green building certifications, including ENERGY STAR and DOE Zero Energy Ready Home by loan count and UPB. • Renewable Energy Stratification: The share of loans secured by properties with renewable energy sources, including solar and geothermal, by loan count and UPB. The Green Indicator will be disclosed for all MBS securities that meet Fannie Mae’s and Freddie Mac’s Single-Family Green MBS program criteria. The Green Program Criteria Stratification will highlight the eligible energy efficiency programs of the properties backing the underlying collateral. The additional stratifications will provide more details about these programs. The stratifications are dynamic and will be disclosed only if the pool meets the applicable program criteria.