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ETF · holdings as filed 2026-05-31

What's inside MFSB?

MFS Active Core Plus Bond ETF
Holdings
409
positions in the fund
Top 10
26%
of fund assets
Expense ratio
0.34%
net, per year
Fund size
$424M
total net assets

Top 20 holdings

RankLogoTicker / NameWeight
1
BOND
US Treasury Note4.625% · Nov 2045
7.60%
2
BOND
US Treasury Note4.625% · Nov 2055
3.77%
3
BOND
US Treasury Note3.875% · Jul 2030
3.42%
4
BOND
US Treasury Note4.125% · Oct 2029
3.16%
5
G
GVMXXSTATE ST INST US GOV MM-PREM
2.77%
6
BOND
US Treasury Note4.625% · Nov 2044
1.21%
7
BOND
US Treasury Note4.875% · Aug 2045
1.17%
8
BOND
US Treasury Note4.5% · Nov 2054
1.16%
9
F
FNCL 6 6.11FNCL 6 6/11
0.77%
10
BOND
US Treasury Note4.25% · Feb 2054
0.71%
11
BOND
Nrzt 2025-Nqm3 A1
0.64%
12
F
FNCL 5.5 6.11FNCL 5.5 6/11
0.62%
13
BOND
Boston Properties5.75% · Jan 2035
0.60%
14
BOND
Highwoods Realty5.35% · Jan 2033
0.58%
15
BOND
Stwd 2025-Fl4 As
0.58%
16
BOND
Elmw8 2021-1a Crr
0.58%
17
BOND
Bcc 2019-1a Cr3
0.58%
18
BOND
Lncr 2025-Cre9 As
0.58%
19
BOND
Mf1 2026-Fl21 C
0.57%
20
B
BX 2026-CSMO ABX 2026-CSMO A
0.55%
Sectors tap a row to see its top 10 holdings
Top holdings — Bonds & Fixed Income
Your 10 largest positions in this sector
1
BOND
US Treasury Note4.625% · Nov 2045
7.60%
2
BOND
US Treasury Note4.625% · Nov 2055
3.77%
3
BOND
US Treasury Note3.875% · Jul 2030
3.42%
4
BOND
US Treasury Note4.125% · Oct 2029
3.16%
5
BOND
US Treasury Note4.625% · Nov 2044
1.21%
6
BOND
US Treasury Note4.875% · Aug 2045
1.17%
7
BOND
US Treasury Note4.5% · Nov 2054
1.16%
8
BOND
US Treasury Note4.25% · Feb 2054
0.71%
9
BOND
Nrzt 2025-Nqm3 A1
0.64%
10
BOND
Boston Properties5.75% · Jan 2035
0.60%
Geography tap a row to see its top 10 holdings
Top holdings — United States
Your 10 largest positions in this country
1
BOND
US Treasury Note4.625% · Nov 2045
7.60%
2
BOND
US Treasury Note4.625% · Nov 2055
3.77%
3
BOND
US Treasury Note3.875% · Jul 2030
3.42%
4
BOND
US Treasury Note4.125% · Oct 2029
3.16%
5
G
GVMXXSTATE ST INST US GOV MM-PREM
2.77%
6
BOND
US Treasury Note4.625% · Nov 2044
1.21%
7
BOND
US Treasury Note4.875% · Aug 2045
1.17%
8
BOND
US Treasury Note4.5% · Nov 2054
1.16%
9
F
FNCL 6 6.11FNCL 6 6/11
0.77%
10
BOND
US Treasury Note4.25% · Feb 2054
0.71%
Geography reflects each issuer's registered business address per SEC EDGAR filings where available, falling back to the exchange or listing where no SEC filing exists — not necessarily where a company's stock is primarily listed (e.g. TSMC is classified as Taiwan even though its ADR trades on the NYSE).
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Data source: official SEC Form N-PORT filings (as of 2026-05-31); expense ratio from SEC prospectus (risk/return) filings. Fund holdings are disclosed quarterly and may reflect a 60-day reporting delay.
Informational and educational only — not investment advice.