MFSB Performance — MFS Active Core Plus Bond ETF
Data updated: 2026-07-27
MFSB returned +0.79% year to date and +5.99% over one year to May 2026. Over one year the fund beat its Intermediate Core Bond category average: $100 grew to $106, against $105 for the category. Volatility over the past 12 months was 3.28% a year. In the 12 months to May 2026 the fund took in a net $384.2M, and assets reached $423.77M.
MFSB Growth of $100
What $100 invested in MFS Active Core Plus Bond ETF grew to, compounded from monthly returns reported on SEC Form N-PORT, against the Intermediate Core Bond category average over the same months.
| Period | MFSB | Category average |
|---|---|---|
| 1 year (Jun 2025 – May 2026) | $106 | $105 |
| Since data start (Dec 2024 – May 2026) | $107 | $106 |
MFSB Trailing Returns
Total returns to May 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +0.79% |
| 1 year | +5.99% |
MFSB Annual Returns
Calendar-year total returns of MFS Active Core Plus Bond ETF, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–May) | +0.79% |
| 2025 | +7.78% |
| 2024 (Dec–Dec) | −1.84% |
MFSB Monthly Returns
Monthly total returns as reported on SEC Form N-PORT.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | +0.3% | +1.5% | −1.9% | +0.5% | +0.4% | — | — | — | — | — | — | — |
| 2025 | +0.7% | +2.0% | −0.1% | +0.1% | −0.2% | +1.7% | 0.0% | +1.1% | +1.3% | +0.6% | +0.6% | −0.2% |
| 2024 | — | — | — | — | — | — | — | — | — | — | — | −1.8% |
MFSB Risk
Risk measures from monthly returns over Jun 2025 – May 2026.
- 1-year volatility (annualised): 3.28%
- Best month: +1.68% (Jun 2025)
- Worst month: −1.90% (Mar 2026)
MFSB Fund Flows
Monthly money in and out of MFS Active Core Plus Bond ETF, from SEC Form N-PORT.
- 12-month net flow: $384.2M
- 12-month gross sales (incl. reinvestments): $384.2M
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| May 2026 | $15.5M | $0 | $15.5M |
| Apr 2026 | $36.3M | $0 | $36.3M |
| Mar 2026 | $145.3M | $0 | $145.3M |
| Feb 2026 | $37.4M | $0 | $37.4M |
| Jan 2026 | $33.4M | $0 | $33.4M |
| Dec 2025 | $10.1M | $0 | $10.1M |
| Nov 2025 | $21.5M | $0 | $21.5M |
| Oct 2025 | $22.9M | $0 | $22.9M |
| Sep 2025 | $27.1M | $0 | $27.1M |
| Aug 2025 | $3.7M | $0 | $3.7M |
| Jul 2025 | $3.1M | $0 | $3.1M |
| Jun 2025 | $27.8M | $0 | $27.8M |
MFSB Assets Under Management
Net assets of MFS Active Core Plus Bond ETF by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-05-31 | $423.77M |
| 2026-02-28 | $232.68M |
| 2025-11-30 | $150.54M |
| 2025-08-31 | $77.99M |
| 2025-05-31 | $42.39M |
| 2025-02-28 | $41.14M |
For information only. Not investment advice: figures are as reported in SEC filings and may contain errors or be out of date. Past performance does not guarantee future results.