ETF · holdings as filed 2026-04-30
What's inside MCBCX?
MFS Core Bond Fund
- Holdings
- 307
- positions in the fund
- Top 10
- 23%
- of fund assets
- Expense ratio
- 1.39%
- net, per year
- Fund size
- $34M
- total net assets
Top 20 holdings
| Rank | Logo | Ticker / Name | Weight | |
|---|---|---|---|---|
| 1 | ? | —MFS Institutional Money Market Portfolio | 4.63% | |
| 2 | T  | T 4.25 06.30.29US TREASURY N/B | 4.16% | |
| 3 | T  | T 4.5 02.15.44US TREASURY N/B | 2.65% | |
| 4 | T  | T 2.375 02.15.42US TREASURY N/B | 2.60% | |
| 5 | T  | T 3.5 09.30.27US TREASURY N/B | 1.70% | |
| 6 | T  | T 4.5 04.15.27US TREASURY N/B | 1.58% | |
| 7 | T  | T 2.25 02.15.52US TREASURY N/B | 1.53% | |
| 8 | T  | T 4.25 02.15.54US TREASURY N/B | 1.31% | |
| 9 | T  | T 3.875 07.31.30US TREASURY N/B | 1.28% | |
| 10 | N  | NTT 5.502 07.16.35 144ANTT FINANCE CORP | 1.16% | |
| 11 | F  | FNCL 3.5 5.11FNCL 3.5 5/11 | 1.10% | |
| 12 | T  | T 4.5 11.15.54US TREASURY N/B | 1.08% | |
| 13 | T  | T 4 11.15.52US TREASURY N/B | 0.93% | |
| 14 | T  | T 4.625 11.15.45US TREASURY N/B | 0.88% | |
| 15 | T  | T 4.125 07.31.28US TREASURY N/B | 0.86% | |
| 16 | F  | FN MA4563FN MA4563 | 0.80% | |
| 17 | B  | BAC V2.572 10.20.32BANK OF AMERICA CORP | 0.77% | |
| 18 | B  | BCC 2022.1A CRBCC 2022-1A CR | 0.71% | |
| 19 | D  | DRSLF 2020.86A BR2DRSLF 2020-86A BR2 | 0.71% | |
| 20 | D  | DRSLF 2019.68A BRRDRSLF 2019-68A BRR | 0.71% |
Top holdings — Bonds & Fixed Income
Your 10 largest positions in this sector
1
T
T 4.25 06.30.29US TREASURY N/B
4.16%2
T
T 4.5 02.15.44US TREASURY N/B
2.65%3
T
T 2.375 02.15.42US TREASURY N/B
2.60%4
T
T 3.5 09.30.27US TREASURY N/B
1.70%5
T
T 4.5 04.15.27US TREASURY N/B
1.58%6
T
T 2.25 02.15.52US TREASURY N/B
1.53%7
T
T 4.25 02.15.54US TREASURY N/B
1.31%8
T
T 3.875 07.31.30US TREASURY N/B
1.28%9
N
NTT 5.502 07.16.35 144ANTT FINANCE CORP
1.16%10
T
T 4.5 11.15.54US TREASURY N/B
1.08%Top holdings — United States
Your 10 largest positions in this country
1
T
T 4.25 06.30.29US TREASURY N/B
4.16%2
T
T 4.5 02.15.44US TREASURY N/B
2.65%3
T
T 2.375 02.15.42US TREASURY N/B
2.60%4
T
T 3.5 09.30.27US TREASURY N/B
1.70%5
T
T 4.5 04.15.27US TREASURY N/B
1.58%6
T
T 2.25 02.15.52US TREASURY N/B
1.53%7
T
T 4.25 02.15.54US TREASURY N/B
1.31%8
T
T 3.875 07.31.30US TREASURY N/B
1.28%9
N
NTT 5.502 07.16.35 144ANTT FINANCE CORP
1.16%10
F
FNCL 3.5 5.11FNCL 3.5 5/11
1.10%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 2026-04-30); 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.
Informational and educational only — not investment advice.