FundWatcher
MIABX
MFS Inflation-Adjusted Bond Fund
MFS Series Trust IX

Portfolio concentration

As of January 31, 2026 · N-PORT
Holdings
101
Top-10 weight
67.48%
Effective holdings ?
17
Crowding ?
127.6

Holdings

As of January 31, 2026 · N-PORT
#SecurityTickerSharesValue% of fund
1 U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-1/8% 01/15/2031 TII 189,654,877 $178.94M 11.62%
2 U.S. TREASURY INFLATION-PROTECTED SECURITIES .125 07/15/2030 TII 148,993,898 $142.32M 9.24%
3 U.S. Treasury Inflation-Protected Notes 1.75%, Due 01/15/2034 TII 115,833,309 $116.08M 7.54%
4 U.S. TREASURY INFLATION-PROTECTED SECURITIES .875% 01/15/2029 TII 115,241,734 $114.63M 7.44%
5 U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-1/8% 01/15/32 TII 104,860,211 $96.94M 6.30%
6 U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-3/8% 07/15/2027 TII 90,149,025 $89.86M 5.84%
7 U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-3/4% 02/15/2042 TII 106,156,381 $82.85M 5.38%
8 U.S. TREASURY INFLATION-PROTECTED SECURITIES 1.125% 01/15/2033 TII 77,094,605 $74.67M 4.85%
9 U.S. TREASURY INFLATION-PROTECTED SECURITIES 3-5/8% 04/15/28 US28AP 68,052,138 $71.90M 4.67%
10 U.S. TREASURY INFLATION-PROTECTED SECURITIES 1.375 07/15/33 TII 70,010,043 $68.85M 4.47%
11 U.S. Treasury Inflation-Linked Notes TII 62,125,240 $61.83M 4.02%
12 U.S. Treasury Notes TII 57,701,133 $58.57M 3.80%
13 U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-1/2% 01/15/2028 TII 57,909,294 $57.43M 3.73%
14 U.S. Treasury Inflation-Protected Indexed Notes TII 40,336,307 $40.80M 2.65%
15 U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-3/4% 02/15/2045 TII 54,665,500 $39.89M 2.59%
16 U.S. Treasury Inflation-Protected Notes 2.125%, Due 02/15/2054 TII 35,069,913 $31.43M 2.04%
17 U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-5/8% 02/15/2043 TII 37,241,630 $27.81M 1.81%
18 U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-1/8% 02/15/2052 TII 42,212,784 $22.23M 1.44%
19 U.S. TREASURY INFLATION-PROTECTED SECURITIES 1% 02/15/48 TII 25,426,488 $18.56M 1.21%
20 MFS Institutional Money Market Portfolio, Class A — 15,157,264 $15.16M 0.98%
21 U.S. Treasury Notes 0.125%, Due 1/15/2030 TII 12,272,777 $11.77M 0.76%
22 U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-5/8% 07/15/2032 TII 11,713,170 $11.10M 0.72%
23 Government National Mortgage Association — 6,895,461 $6.95M 0.45%
24 Palmer Square Loan Funding Ltd., Series 2025-2A, Class A2 — 5,700,000 $5.70M 0.37%
25 U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-3/4% 07/15/2028 TII 5,164,920 $5.15M 0.33%
26 Palmer Square Loan Funding Ltd., Series 2025-1A, Class A2 PSTAT 4,300,000 $4.30M 0.28%
27 Fannie Mae REMICS — 3,978,775 $4.07M 0.26%
28 SHACKLETON CLO LTD SHACK 2019 14A BRR 144A — 3,996,016 $4.00M 0.26%
29 Freddie Mac REMICS — 3,850,976 $3.87M 0.25%
30 Government National Mortgage Association — 3,827,956 $3.83M 0.25%
31 PFS Financing Corp., Series 2025-A, Class A — 3,476,000 $3.48M 0.23%
32 Barings CLO Ltd., Series 2021-3A, Class B1R — 3,000,000 $3.01M 0.20%
33 Government National Mortgage Association — 2,818,804 $2.85M 0.18%
34 Freddie Mac REMICS 3137H9AD 2,675,499 $2.67M 0.17%
35 Toledo Hospital/The — 2,421,000 $2.48M 0.16%
36 AREIT Trust, Series 2022-CRE6, Class AS — 2,462,500 $2.45M 0.16%
37 Government National Mortgage Association — 2,458,655 $2.41M 0.16%
38 GreatAmerica Leasing Receivables Funding LLC, Series 2025-1, Class A2 — 2,310,095 $2.32M 0.15%
39 FNMA, Series 2023-54, Class FD — 1,708,762 $1.73M 0.11%
40 Government National Mortgage Association — 1,694,918 $1.70M 0.11%
41 PMTLT 2025-INV10 A36 PMTLT 1,658,093 $1.66M 0.11%
42 Government National Mortgage Association — 1,455,453 $1.48M 0.10%
43 PMTLT 2026-CNF1 A26 — 1,438,428 $1.44M 0.09%
44 CONSFD 3.474 12/15/29 2019 CONSFD 1,438,000 $1.38M 0.09%
45 Freddie Mac Multifamily Structured Pass Through Certificates — 54,980,294 $1.36M 0.09%
46 ARI Fleet Lease Trust, Series 2025-A, Class A2 — 1,327,528 $1.33M 0.09%
47 Government National Mortgage Association — 1,302,282 $1.30M 0.08%
48 MSRM 2025-NQM3 VAR 05/25/2070 144A — 1,269,854 $1.28M 0.08%
49 J.P. Morgan Mortgage Trust, Series 2026-NQM1, Class A1 — 1,265,018 $1.27M 0.08%
50 Freddie Mac Multifamily Structured Pass Through Certificates — 50,485,813 $1.26M 0.08%
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