# Portfolio overlap — MGSIX vs LUTAX Comparing **MFS Government Securities Fund** (2026-02-28) and **Columbia U.S. Treasury Index Fund** (2026-01-31). - Shared positions: 24 - MFS Government Securities Fund covered by Columbia U.S. Treasury Index Fund: 0.08941167950954488268174595219 - Columbia U.S. Treasury Index Fund covered by MFS Government Securities Fund: 0.08941167950954488268174595217 ## MFS Government Securities Fund — top positions | Security | Weight | Shared | |----------|--------|--------| | US TREASURY N/B | 0.043040 | ✓ | | US TREASURY N/B | 0.041534 | ✓ | | US TREASURY N/B | 0.037557 | ✓ | | US TREASURY N/B | 0.034432 | ✓ | | MFS Institutional Money Market Portfolio, Class A | 0.031650 | | | US TREASURY N/B | 0.025619 | ✓ | | US TREASURY N/B | 0.018485 | ✓ | | US TREASURY N/B | 0.018202 | ✓ | | US TREASURY N/B | 0.017927 | ✓ | | US TREASURY N/B | 0.016762 | ✓ | | FNCL 2 4/26 | 0.015755 | | | US TREASURY N/B | 0.014594 | ✓ | | US TREASURY N/B | 0.013441 | ✓ | | FHMS K057 A2 | 0.012160 | | | US TREASURY N/B | 0.010569 | ✓ | | US TREASURY N/B | 0.010081 | ✓ | | FN MA4562 | 0.009974 | | | FHMS K066 A2 | 0.009793 | | | US TREASURY N/B | 0.009052 | ✓ | | US TREASURY N/B | 0.008949 | ✓ | | G2 MA8268 | 0.008128 | | | Uniform Mortgage-Backed Security, TBA | 0.008109 | | | FHMS K062 A2 | 0.007885 | | | Federal Home Loan Mortgage Corporation | 0.006362 | | | FR SD8507 | 0.006002 | | | UMBS | 0.005694 | | | FHMS K059 A2 | 0.005686 | | | US TREASURY N/B | 0.005597 | ✓ | | US TREASURY N/B | 0.005504 | ✓ | | US TREASURY N/B | 0.005334 | ✓ | | GNMA, Series 2023-135, Class FG | 0.005147 | | | FHMS K737 A2 | 0.005139 | | | GNMA, Series 2023-189, Class FG | 0.005046 | | | GNMA, Series 2023-149, Class YF | 0.005008 | | | Government National Mortgage Association | 0.004995 | | | GNMA, Series 2023-146, Class FD | 0.004961 | | | US TREASURY N/B | 0.004843 | ✓ | | New Residential Mortgage Loan Trust, Series 2026-NQM3, Class A1 | 0.004828 | | | PMT Loan Trust, Series 2026-INV2, Class A35 | 0.004811 | | | FHMS K065 A2 | 0.004801 | | | LoanCore Issuer Ltd., Series 2021-CRE6, Class AS | 0.004791 | | | UMBS | 0.004783 | | | G2 MA7935 | 0.004630 | | | GNMA, Series 2025-177, Class FA | 0.004628 | | | Government National Mortgage Association | 0.004617 | | | G2 MA7880 | 0.004579 | | | FN MA5353 | 0.004553 | | | Government National Mortgage Association | 0.004543 | | | Government National Mortgage Association | 0.004509 | | | American Credit Acceptance Receivables Trust, Series 2026-1, Class A | 0.004357 | | ## Columbia U.S. Treasury Index Fund — top positions | Security | Weight | Shared | |----------|--------|--------| | US TREASURY N/B | 0.009020 | | | US TREASURY N/B | 0.008851 | | | US TREASURY N/B | 0.008754 | | | US TREASURY N/B | 0.008742 | | | US TREASURY N/B | 0.008599 | ✓ | | US TREASURY N/B | 0.008530 | | | US TREASURY N/B | 0.008526 | | | US TREASURY N/B | 0.008426 | | | US TREASURY N/B | 0.007907 | | | US TREASURY N/B | 0.007666 | | | US TREASURY N/B | 0.007246 | | | US TREASURY N/B | 0.007039 | ✓ | | US TREASURY N/B | 0.007032 | ✓ | | US TREASURY N/B | 0.007031 | | | US TREASURY N/B | 0.007027 | | | US TREASURY N/B | 0.006976 | | | US TREASURY N/B | 0.006954 | | | US TREASURY N/B | 0.006949 | | | US TREASURY N/B | 0.006884 | | | US TREASURY N/B | 0.006625 | | | US TREASURY N/B | 0.006609 | | | US TREASURY N/B | 0.006520 | | | US TREASURY N/B | 0.006445 | | | US TREASURY N/B | 0.005704 | | | US TREASURY N/B | 0.005431 | | | US TREASURY N/B | 0.005426 | | | US TREASURY N/B | 0.005338 | | | US TREASURY N/B | 0.005302 | | | US TREASURY N/B | 0.005281 | | | US TREASURY N/B | 0.005159 | | | US TREASURY N/B | 0.005133 | | | US TREASURY N/B | 0.005131 | | | US TREASURY N/B | 0.005119 | | | US TREASURY N/B | 0.005119 | | | US TREASURY N/B | 0.005108 | ✓ | | US TREASURY N/B | 0.005084 | | | US TREASURY N/B | 0.005080 | | | US TREASURY N/B | 0.005058 | | | US TREASURY N/B | 0.005057 | | | US TREASURY N/B | 0.005052 | | | US TREASURY N/B | 0.005035 | | | US TREASURY N/B | 0.005035 | | | US TREASURY N/B | 0.005028 | | | US TREASURY N/B | 0.005000 | | | US TREASURY N/B | 0.004996 | | | US TREASURY N/B | 0.004982 | | | US TREASURY N/B | 0.004978 | ✓ | | US TREASURY N/B | 0.004951 | | | US TREASURY N/B | 0.004949 | | | US TREASURY N/B | 0.004947 | ✓ | ## Sources - N-PORT (fund A) — accession `0002071691-26-008227` (as of 2026-02-28) - N-PORT (fund B) — accession `0001410368-26-033335` (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 _