Upgrade Master Pass-Thru Trust Upgrade Master Pass-Thru Trust, Series 2025-ST6, Class B is a security (CUSIP 91533QAB3) tracked across SEC portfolio filings. 1 registered fund positions totaling $211K via N-PORT as of 2025-10-31.
| Fund | Registrant | Value | % of fund |
|---|---|---|---|
| BlackRock Securitized Income Fund | Managed Account Series II | $211K | 4.65% |