S&P Global Ratings has assigned credit ratings to Mortimer BTL 2023-1 PLC's (Mortimer 2023-1) class A and B notes and class C-Dfrd to X-Dfrd interest deferrable notes. Mortimer 2023-1 is a static RMBS transaction that securitizes a portfolio of buy-to-let (BTL) mortgage loans secured on properties in the U.K. LendInvest BTL Ltd. originated the loans in the pool between 2018 and 2023.