Wells Fargo Mortgage Backed Securities 2020-4 Trust -- Moody's assigns provisional ratings to Prime RMBS issued by Wells Fargo Mortgage Backed Securities 2020-4 Trust

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Rating Action: Moody's assigns provisional ratings to Prime RMBS issued by Wells Fargo Mortgage Backed Securities 2020-4 Trust

Global Credit Research - 04 Aug 2020

New York, August 04, 2020 -- Moody's Investors Service, ("Moody's") has assigned provisional ratings to 25 classes of residential mortgage-backed securities (RMBS) issued by Wells Fargo Mortgage Backed Securities 2020-4 Trust ("WFMBS 2020-4"). The ratings range from (P)Aaa (sf) to (P)Ba3 (sf).

WFMBS 2020-4 is the fourth prime issuance by Wells Fargo Bank, N.A. (Wells Fargo Bank, the sponsor and mortgage loan seller) in 2020, consisting of 427 primarily 30-year, fixed rate, prime residential mortgage loans with an unpaid principal balance of $335,327,214. The pool has strong credit quality and consists of borrowers with high FICO scores, significant equity in their properties and liquid cash reserves. The pool has clean pay history and weighted average seasoning of approximately 5.16 months. The mortgage loans for this transaction are originated by Wells Fargo Bank, through its retail and correspondent channels, in accordance with its underwriting guidelines. In this transaction, all 427 loans are designated as qualified mortgages (QM) under the QM safe harbor rules. Wells Fargo Bank will service all the loans and will also be the master servicer for this transaction.

The securitization has a shifting interest structure with a five-year lockout period that benefits from a senior floor and a subordinate floor. We coded the cash flow to each of the certificate classes using Moody's proprietary cash flow tool.

The complete rating actions are as follows:

Issuer: Wells Fargo Mortgage Backed Securities 2020-4 Trust

Cl. A-1, Assigned (P)Aaa (sf)

Cl. A-2, Assigned (P)Aaa (sf)

Cl. A-3, Assigned (P)Aaa (sf)

Cl. A-4, Assigned (P)Aaa (sf)

Cl. A-5, Assigned (P)Aaa (sf)

Cl. A-6, Assigned (P)Aaa (sf)

Cl. A-7, Assigned (P)Aaa (sf)

Cl. A-8, Assigned (P)Aaa (sf)

Cl. A-9, Assigned (P)Aaa (sf)

Cl. A-10, Assigned (P)Aaa (sf)

Cl. A-11, Assigned (P)Aaa (sf)

Cl. A-12, Assigned (P)Aaa (sf)

Cl. A-13, Assigned (P)Aaa (sf)

Cl. A-14, Assigned (P)Aaa (sf)

Cl. A-15, Assigned (P)Aaa (sf)

Cl. A-16, Assigned (P)Aaa (sf)

Cl. A-17, Assigned (P)Aa1 (sf)

Cl. A-18, Assigned (P)Aa1 (sf)

Cl. A-19, Assigned (P)Aaa (sf)

Cl. A-20, Assigned (P)Aaa (sf)

Cl. B-1, Assigned (P)Aa3 (sf)

Cl. B-2, Assigned (P)A3 (sf)

Cl. B-3, Assigned (P)Baa3 (sf)

Cl. B-4, Assigned (P)Ba1 (sf)

Cl. B-5, Assigned (P)Ba3 (sf)

RATINGS RATIONALE

Summary Credit Analysis and Rating Rationale

Moody's expected loss for this pool in a baseline scenario-mean is 0.24% and reaches 3.39% at a stress level consistent with our Aaa ratings.