# Portfolio overlap — MIAKX vs FIPDX Comparing **MFS Inflation-Adjusted Bond Fund** (2026-01-31) and **Fidelity Inflation-Protected Bond Index Fund** (2026-03-31). - Shared positions: 22 - MFS Inflation-Adjusted Bond Fund covered by Fidelity Inflation-Protected Bond Index Fund: 0.4305774993558299309947947756 - Fidelity Inflation-Protected Bond Index Fund covered by MFS Inflation-Adjusted Bond Fund: 0.4305774993558299309947947757 ## MFS Inflation-Adjusted Bond Fund — top positions | Security | Weight | Shared | |----------|--------|--------| | U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-1/8% 01/15/2031 | 0.116435 | ✓ | | U.S. TREASURY INFLATION-PROTECTED SECURITIES .125 07/15/2030 | 0.092607 | ✓ | | U.S. Treasury Inflation-Protected Notes 1.75%, Due 01/15/2034 | 0.075530 | ✓ | | U.S. TREASURY INFLATION-PROTECTED SECURITIES .875% 01/15/2029 | 0.074589 | ✓ | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-1/8% 01/15/32 | 0.063078 | ✓ | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-3/8% 07/15/2027 | 0.058474 | ✓ | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-3/4% 02/15/2042 | 0.053909 | ✓ | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 1.125% 01/15/2033 | 0.048591 | ✓ | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 3-5/8% 04/15/28 | 0.046787 | ✓ | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 1.375 07/15/33 | 0.044802 | ✓ | | U.S. Treasury Inflation-Linked Notes | 0.040233 | ✓ | | U.S. Treasury Notes | 0.038109 | ✓ | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-1/2% 01/15/2028 | 0.037370 | ✓ | | U.S. Treasury Inflation-Protected Indexed Notes | 0.026549 | ✓ | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-3/4% 02/15/2045 | 0.025956 | ✓ | | U.S. Treasury Inflation-Protected Notes 2.125%, Due 02/15/2054 | 0.020454 | ✓ | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-5/8% 02/15/2043 | 0.018096 | ✓ | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-1/8% 02/15/2052 | 0.014466 | ✓ | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 1% 02/15/48 | 0.012076 | ✓ | | MFS Institutional Money Market Portfolio, Class A | 0.009865 | | | U.S. Treasury Notes 0.125%, Due 1/15/2030 | 0.007661 | ✓ | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-5/8% 07/15/2032 | 0.007224 | ✓ | | Government National Mortgage Association | 0.004522 | | | Palmer Square Loan Funding Ltd., Series 2025-2A, Class A2 | 0.003711 | | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-3/4% 07/15/2028 | 0.003354 | ✓ | | Palmer Square Loan Funding Ltd., Series 2025-1A, Class A2 | 0.002798 | | | Fannie Mae REMICS | 0.002647 | | | SHACKLETON CLO LTD SHACK 2019 14A BRR 144A | 0.002601 | | | Freddie Mac REMICS | 0.002521 | | | Government National Mortgage Association | 0.002490 | | | PFS Financing Corp., Series 2025-A, Class A | 0.002265 | | | Barings CLO Ltd., Series 2021-3A, Class B1R | 0.001956 | | | Government National Mortgage Association | 0.001852 | | | Freddie Mac REMICS | 0.001736 | | | Toledo Hospital/The | 0.001613 | | | AREIT Trust, Series 2022-CRE6, Class AS | 0.001596 | | | Government National Mortgage Association | 0.001565 | | | GreatAmerica Leasing Receivables Funding LLC, Series 2025-1, Class A2 | 0.001508 | | | FNMA, Series 2023-54, Class FD | 0.001129 | | | Government National Mortgage Association | 0.001108 | | | PMTLT 2025-INV10 A36 | 0.001083 | | | Government National Mortgage Association | 0.000965 | | | PMTLT 2026-CNF1 A26 | 0.000936 | | | CONSFD 3.474 12/15/29 2019 | 0.000898 | | | Freddie Mac Multifamily Structured Pass Through Certificates | 0.000885 | | | ARI Fleet Lease Trust, Series 2025-A, Class A2 | 0.000867 | | | Government National Mortgage Association | 0.000849 | | | MSRM 2025-NQM3 VAR 05/25/2070 144A | 0.000836 | | | J.P. Morgan Mortgage Trust, Series 2026-NQM1, Class A1 | 0.000823 | | | Freddie Mac Multifamily Structured Pass Through Certificates | 0.000822 | | ## Fidelity Inflation-Protected Bond Index Fund — top positions | Security | Weight | Shared | |----------|--------|--------| | U.S. Treasury Inflation-Protected Indexed Notes | 0.040490 | ✓ | | U.S. Treasury Inflation-Protected Indexed Notes | 0.040075 | | | U.S. Treasury Notes | 0.039764 | | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 1.375 07/15/33 | 0.036575 | ✓ | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-5/8% 07/15/2032 | 0.035230 | ✓ | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-1/8% 04/15/2027 | 0.034278 | | | U.S. Treasury Inflation-Protected Indexed Notes | 0.032981 | | | U.S. Treasury Inflation-Protected Notes 1.75%, Due 01/15/2034 | 0.032638 | ✓ | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-1/8% 01/15/2031 | 0.032396 | ✓ | | U.S. Treasury Notes | 0.031104 | ✓ | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 2.375% 10/15/2028 | 0.031092 | | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 1.125% 01/15/2033 | 0.030964 | ✓ | | U.S. TREASURY INFLATION-PROTECTED SECURITIES .125 07/15/2030 | 0.030843 | ✓ | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-1/8% 07/15/2031 | 0.029985 | | | U.S. Treasury Notes | 0.029584 | | | U.S. Treasury Notes 0.125%, Due 1/15/2030 | 0.028565 | ✓ | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 1.250 04/15/2028 | 0.028399 | | | U.S. Treasury Inflation-Linked Notes | 0.028146 | ✓ | | U.S. TREASURY INFLATION-PROTECTED SECURITIES .25% 07/15/29 | 0.027894 | | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-1/2% 01/15/2028 | 0.027760 | ✓ | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 1-5/8% 10/15/27 | 0.027648 | | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-1/8% 01/15/32 | 0.026958 | ✓ | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-3/4% 07/15/2028 | 0.024049 | ✓ | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-3/8% 07/15/2027 | 0.020856 | ✓ | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 3-5/8% 04/15/28 | 0.017717 | ✓ | | U.S. TREASURY INFLATION-PROTECTED SECURITIES .875% 01/15/2029 | 0.016719 | ✓ | | U.S. Treasury Inflation-Indexed Notes | 0.014777 | | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 2-1/2% 01/15/29 | 0.013932 | | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 1-3/8% 02/15/2044 | 0.013777 | | | U.S. Treasury Inflation-Protected Indexed Bonds | 0.013193 | | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 3-7/8% 04/15/29 | 0.012840 | | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-3/4% 02/15/2045 | 0.012341 | ✓ | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 1.50% 2/15/2053 | 0.011301 | | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-3/4% 02/15/2042 | 0.011301 | ✓ | | Fidelity Securities Lending Cash Central Fund | 0.010993 | | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-7/8% 02/15/2047 | 0.009590 | | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-5/8% 02/15/2043 | 0.009230 | ✓ | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 3-3/8% 04/15/32 | 0.009109 | | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 0.25% 02/15/2050 | 0.007968 | | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 1-3/4% 01/15/28 | 0.007904 | | | U.S. Treasury Inflation-Protected Indexed Bonds | 0.007790 | | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-1/8% 02/15/2052 | 0.006942 | ✓ | | U.S. Treasury Inflation-Protected Notes 2.125%, Due 02/15/2054 | 0.006882 | ✓ | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 2 1/8% 02/15/40 | 0.006532 | | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 1% 02/15/48 | 0.006417 | ✓ | | UNITED STATES TREASURY INFLATION INDEXED BONDS I/L 2.375% 02-15-56 | 0.005754 | | | U.S. Treasury Inflation-Protected Indexed Bonds | 0.005529 | | | Fidelity Cash Central Fund | 0.005409 | | | U.S. TREASURY INFLATION-PROTECTED SECURITIES 1% 02/15/46 | 0.005347 | | | U.S. Treasury Inflation Linked Bonds | 0.002432 | | ## Sources - N-PORT (fund A) — accession `0001410368-26-032759` (as of 2026-01-31) - N-PORT (fund B) — accession `0000035402-26-003383` (as of 2026-03-31) --- _Informational only — not investment advice. 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