# Portfolio overlap — MMIIX vs AMHIX Comparing **MFS Municipal High Income Fund** (2026-04-30) and **American High-Income Municipal Bond Fund** (2026-01-31). - Shared positions: 558 - MFS Municipal High Income Fund covered by American High-Income Municipal Bond Fund: 0.1259574585338811744205008562 - American High-Income Municipal Bond Fund covered by MFS Municipal High Income Fund: 0.1259574585338811744205008561 ## MFS Municipal High Income Fund — top positions | Security | Weight | Shared | |----------|--------|--------| | MFS Institutional Money Market Portfolio, Class A | 0.024028 | | | PUERTO RICO SALES TAX FING COR REGD OID B/E 5.00000000 | 0.018741 | ✓ | | TOWER HEALTH OBLIGATED GROUP 5.0% 06-30-39 | 0.005957 | ✓ | | OH BUCGEN 5 06/01/2055 | 0.005833 | ✓ | | California (State of) Community Choice Financing Authority (Green Bonds), Series 2023 C, RB | 0.005060 | | | NY TRANS CORP(JFK INT NEW ONE)/AGM 5.13% 6/30/60@ | 0.004633 | | | New Hampshire Business Finance Authority, Series 2023A | 0.004553 | | | City of Chicago, Series 2021A | 0.004514 | ✓ | | NY TRANS CORP(JFK INT NEW ONE)/AGM 5.25% 6/30/60@ | 0.004427 | | | TOBACCO SETTLEMENT-B2 | 0.004273 | ✓ | | NOVANT HEALTH OBLIGATED GROUP 5.5% 06-01-50 | 0.003824 | ✓ | | CHICAGO ILLIN 6% 4/1/2046 | 0.003765 | ✓ | | PENNSYLVANIA ST ECON DEV FING REGD OID B/E AMT AG 5.00000000 | 0.003522 | | | AL BBEUTL 5 06/01/2036 | 0.003506 | | | NY TRANSPRTN DEV CORP | 0.003396 | ✓ | | NY NYCDEV 5 11/15/2044 | 0.003369 | | | Wisconsin (State of) Public Finance Authority, Series 2012 B, Ref. RB | 0.003348 | ✓ | | MOHEG CT 608327 7.00% 2/1/2045 | 0.003346 | | | FL ST DFC 5% 7/1/2044 @ | 0.003309 | | | Palm Beach County, Florida, Revenue Bonds, Provident Group - LU Properties LLC Lynn University Housing Project, Series 2021A | 0.003113 | | | Port of Beaumont Navigation District, Series 2024B | 0.003041 | | | JEA WTR & SWR REV-A | 0.003028 | | | Wisconsin (State of) Public Finance Authority (American Dream at Meadowlands), Series 2017, RB | 0.003025 | | | PROJECTNEW YORK TRANS | 0.003013 | ✓ | | Alachua County Health Facilities Authority, Series 2025 A | 0.003007 | | | Michigan State Housing Development Authority, Series 2024A | 0.002979 | | | New Hampshire Health and Education Facilities Authority Act, Series 2024 | 0.002877 | | | GOLDEN ST TOBACCO SEC | 0.002839 | | | Jefferson (County of), AL, Series 2024, Ref. Revenue Wts. | 0.002820 | ✓ | | Energy Southeast A Cooperative District, Series B-1 | 0.002761 | ✓ | | TENNERGY CORP TN GAS REVENUE TGYPWR 10/53 ADJUSTABLE VAR | 0.002736 | | | MONT PA IDA 5.375% 1/1/2050 | 0.002711 | | | TARRANT RETIRE 5.75% 12/1/2054 | 0.002684 | | | OU MEDICINE OBLIGATED GROUP 5.5% 08-15-57 | 0.002644 | ✓ | | New Hampshire Business Finance Authority, Series 2024A | 0.002605 | | | Louisiana (State of) Public Facilities Authority (I-10 Calcasieu River Bridge), Series 2024, RB | 0.002599 | | | IL CHIEDU 5 12/01/2042 | 0.002584 | ✓ | | NH NFADEV 11/20/2039 | 0.002554 | ✓ | | SHELL POINT OBLIGATED GROUP 5.0% 11-15-54 | 0.002538 | ✓ | | METROHEALTH SYSTEM 5.5% 02-15-52 | 0.002535 | ✓ | | SYRACUSE PILOT 5% 1/1/2034 @ | 0.002529 | | | PUBLIC FIN AUTH WI REVENUE PUBGEN 06/56 FIXED 4.5 | 0.002495 | | | MWAA DULLES TOL 4% 10/1/2049 | 0.002434 | | | FL ST DEV FIN CORP | 0.002382 | | | BERKS PA MUN AU 3% 6/30/2044 | 0.002373 | | | OREGON ST FCS 4.90% 9/15/2035 | 0.002367 | | | PUBLIC FIN WIS 5.50% 6/1/2055 | 0.002366 | | | Black Belt Energy Gas District, Series 2025 A | 0.002328 | | | SOUTH CAROLINA ST HSG FIN & DEV AUTH MTGE REVENUE | 0.002310 | ✓ | | VIRGIN ISLANDS HOTEL DEV FING REGD OID B/E 6.00000000 | 0.002270 | | ## American High-Income Municipal Bond Fund — top positions | Security | Weight | Shared | |----------|--------|--------| | Puerto Rico, General Obligation Bonds, Clawback Highway Transportation Authority Claims Taxable Series 2022 | 0.009354 | | | Puerto Rico, General Obligation Bonds, Vintage CW NT Claims Taxable Series 2022 | 0.009109 | ✓ | | U.S. Treasury Bills | 0.005823 | | | NEW YORK CITY TRANSITIONAL FINANCE AUTHORITY FUTURE TAX SECURED REVENUE FRN 11-01-54 | 0.003461 | | | WASTE PRO USA INC 3.0% 06-01-32 | 0.003403 | | | BIG RIVER STEEL LLC 4.5% 09-01-49 | 0.003402 | | | UIPA CROSSROADS PUBLIC INFRASTRUCTURE DISTRICT AJL PROJECT AREA 4.375% 06-01-52 | 0.003330 | | | Wisconsin (State of) Public Finance Authority, Series 2023 B, RB | 0.003289 | | | CSCDA COMMUNITY IMPROVEMENT AUTHORITY UNION SOUTH BAY 4.0% 07-01-56 | 0.003044 | | | NEW YORK NY REGD V/R B/E 2.65000000 | 0.003043 | | | HM Metropolitan District No. 2, Series 2021, GO Bonds | 0.002976 | | | EDUCATIONAL GROWTH FUND LLC 5.0% 07-01-56 | 0.002851 | | | PUERTO RICO SALES TAX FING COR REGD ZCP OID B/E 0.00000000 | 0.002840 | ✓ | | Puerto Rico Commonwealth Aqueduct & Sewer Authority, Series A | 0.002824 | | | UNITED AIRLINES INC 4.0% 07-15-41 | 0.002804 | | | Public Energy Auth. of Kentucky Gas Supply Rev. Refg. C | 0.002685 | | | BIG RIVER STEEL LLC 4.75% 09-01-49 | 0.002612 | | | OH BUCGEN 5 06/01/2055 | 0.002557 | ✓ | | Montgomery (County of), MD, Series 2017, GO Bonds | 0.002523 | | | Black Belt Energy Gas District, Series 2025 G | 0.002503 | | | IL CHIEDU 5 12/01/2042 | 0.002494 | ✓ | | PUERTO RICO SALES TAX FING COR REGD OID B/E 4.75000000 | 0.002483 | ✓ | | RESTRUCTURED-SER A1 | 0.002461 | ✓ | | Puerto Rico Commonwealth Aqueduct & Sewer Authority, Series B | 0.002432 | | | CO CCKFAC 6 12/01/2051 | 0.002422 | | | WA ST HSG FIN COMMN-1 | 0.002328 | | | State of Hawaii Department of Budget and Finance, The Queen's Health Systems, Series 2025B | 0.002320 | | | CHICAGO IL BRD OF EDU REGD OID B/E 7.00000000 | 0.002299 | ✓ | | NY TRANSPRTN DEV -AMT | 0.002292 | | | TOBACCO SETTLEMENT-B2 | 0.002289 | ✓ | | FREDDIE MAC MULTIFAMILY ML CERTIFICATES SER 2024-ML26 CL A V/R 3.26001000 | 0.002277 | | | PALISADE PARK NORTH METROPOLITAN DISTRICT NO 3 5.5% 12-01-51 | 0.002243 | | | Tender Option Bond Trust Receipts/Certificates | 0.002163 | | | STATE OF HAWAII DEPARTMENT OF BUDGET & FINANCE 4.0% 03-01-37 | 0.002163 | | | LONGS PEAK METROPOLITAN DISTRICT 5.25% 12-01-51 | 0.002163 | | | TOWN OF LITTLE ELM TX SPIRITAS RANCH PUBLIC IMPROVEMENT DISTRICT 5.375% 09-01-51 | 0.002156 | | | AM BIDCO OPERATIONS LLC PIK TL 1ST LIEN 8.5% 10-21-27 | 0.002152 | | | CSCDA Community Improvement Authority, Series 2021 A | 0.002143 | | | NY TRANS CORP 5% 8/1/2031 AMT | 0.002141 | | | LOUISIANA ST LOCAL GOVT ENVRNM REGD B/E 2.50000000 | 0.002102 | | | BUCKLEY METROPOLITAN DISTRICT NO 2 6.0% 12-01-51 | 0.002098 | | | BROOKLYN EVENTS CENTER LLC 5.0% 07-15-42 | 0.002086 | | | UNITED AIRLINES INC 5.25% 07-15-34 | 0.002070 | ✓ | | Rampart Range Metropolitan District No. 5, Series 2021, RB | 0.002065 | | | New Hampshire (State of) Business Finance Authority (Social Bonds), Series 2022-2A, RB | 0.002050 | ✓ | | RIVERSIDE HEALTHCARE ASSOCIATION OBLIGATED GROUP 5.33% 07-01-45 | 0.002031 | | | California Community Housing Agency, Series 2021 A-2 | 0.002009 | | | TX EXXON 12 G=EXXON V1 | 0.001994 | | | LOUDOUN IDA VAR-C-HOW | 0.001980 | | | NY TRANS CORP(LAGUARDIA GATEW) 5.25% 1/1/50@ | 0.001978 | | ## Sources - N-PORT (fund A) — accession `0002071691-26-015576` (as of 2026-04-30) - N-PORT (fund B) — accession `0001193125-26-130883` (as of 2026-01-31) --- _Informational only — not investment advice. FundWatcher presents publicly available data and makes no recommendation to buy or sell any security. Verify all figures against the source filing before relying on them._ _Data sourced from U.S. SEC EDGAR filings (Forms N-PORT, N-CEN, and prospectus Risk/Return summaries). FundWatcher is not affiliated with the SEC._ _Use of this data is subject to the FundWatcher Terms of Service. Information may be used only for personal, non-commercial research and may not be redistributed. See _