MELBOURNE (S&P Global Ratings) April 11, 2024--S&P Global Ratings today assigned its 'AAA (sf)' rating to the class A-R prime residential mortgage-backed securities (RMBS) issued by Perpetual Trustee Co. Ltd. as trustee for Progress 2018-1 Trust. At the same time, we affirmed our ratings on three note classes and withdrew our rating on one class of notes (see list). Progress 2018-1 Trust is a securitization of prime residential mortgages originated by AMP Bank Ltd. We have assigned the rating in anticipation of the refinancing of the existing class A notes with class A-R notes. The rating actions reflect: Perpetual Trustee Co. issuing an expected A$162 million in class A-R notes. Our view of the credit risk of the underlying collateral