MASTR Specialized Loan Trust Mastr Specialized Loan Trust is a security (CUSIP 57643BAA6) tracked across SEC portfolio filings. 2 registered fund positions totaling $353K via N-PORT as of 2026-03-31.
| Fund | Registrant | Value | % of fund |
|---|---|---|---|
| Master Total Return Portfolio | Master Bond LLC | $200K | 0.11% |
| BlackRock Total Return Fund | BlackRock Bond Fund, Inc. | $153K | 0.09% |