MFS Research Bond Fund is a security (CUSIP 55274K603) tracked across SEC portfolio filings. 1 registered fund positions totaling $537.5M via N-PORT as of 2026-05-31.
| Fund | Registrant | Value | % of fund |
|---|---|---|---|
| MFS Conservative Allocation Fund | MFS SERIES TRUST X | $537.5M | 1490.55% |