MGBKX Performance — MFS Global Opportunistic Bond Fund, Class R1
Data updated: 2026-07-23
MGBKX returned +0.34% year to date and +3.76% over one year to May 2026. Annualised returns are +3.88% over 3 years and +0.15% over 5 years. The fund trailed its Global Intermediate Core Bond category average: $100 invested three years ago grew to $112, against $117 for the category, and to $104 over one year, against $105. Volatility over the past three years was 5.27% a year. In the 12 months to May 2026 the fund took in a net $63.7M, and assets reached $1.02B.
MGBKX Growth of $100
What $100 invested in MFS Global Opportunistic Bond Fund grew to, compounded from monthly returns reported on SEC Form N-PORT, against the Global Intermediate Core Bond category average over the same months.
| Period | MGBKX | Category average |
|---|---|---|
| 1 year (Jun 2025 – May 2026) | $104 | $105 |
| 3 years (Jun 2023 – May 2026) | $112 | $117 |
| 5 years (Jun 2021 – May 2026) | $101 | $103 |
| Since data start (Sep 2019 – May 2026) | $106 | $110 |
MGBKX Trailing Returns
Total returns to May 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +0.34% |
| 1 year | +3.76% |
| 3 years (annualised) | +3.88% |
| 5 years (annualised) | +0.15% |
MGBKX Annual Returns
Calendar-year total returns of MFS Global Opportunistic Bond Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–May) | +0.34% |
| 2025 | +4.84% |
| 2024 | +1.53% |
| 2023 | +7.70% |
| 2022 | −11.97% |
| 2021 | −3.86% |
| 2020 | +9.82% |
| 2019 (Sep–Dec) | −0.78% |
MGBKX 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 | +0.5% | +1.2% | −2.5% | +0.6% | +0.6% | — | — | — | — | — | — | — |
| 2025 | +0.5% | +1.1% | −0.8% | +0.8% | −0.3% | +1.3% | −0.2% | +0.7% | +0.9% | +0.6% | +0.1% | −0.1% |
| 2024 | −0.6% | −0.8% | +1.1% | −2.2% | +0.8% | +0.7% | +1.9% | +1.2% | +1.3% | −2.0% | +1.3% | −1.0% |
| 2023 | +3.3% | −1.6% | +1.6% | +0.4% | −1.0% | +0.1% | +0.1% | −0.6% | −2.6% | −1.1% | +4.4% | +4.6% |
| 2022 | −1.9% | −2.1% | −1.3% | −3.1% | −0.9% | −3.0% | +3.0% | −2.1% | −3.2% | −0.4% | +3.4% | −0.9% |
| 2021 | −1.1% | −1.8% | −1.6% | +1.2% | −0.1% | +0.7% | +0.6% | −0.1% | −1.0% | −0.8% | −0.1% | +0.1% |
| 2020 | +1.2% | +0.2% | −4.7% | +2.4% | +1.5% | +1.6% | +3.6% | +0.2% | −0.6% | +0.1% | +2.5% | +1.7% |
| 2019 | — | — | — | — | — | — | — | — | −1.0% | +0.6% | −1.0% | +0.6% |
MGBKX Risk
Risk measures from monthly returns over Jun 2023 – May 2026.
- 3-year volatility (annualised): 5.27%
- 3-year Sharpe ratio: -0.12 (vs 4.5% risk-free rate)
- Best month: +4.59% (Dec 2023)
- Worst month: −2.57% (Sep 2023)
MGBKX Fund Flows
Monthly money in and out of MFS Global Opportunistic Bond Fund, from SEC Form N-PORT.
- 12-month net flow: $63.7M
- 12-month gross sales (incl. reinvestments): $160.8M
- Sales ÷ redemptions: 1.66×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| May 2026 | $7.4M | $3.2M | $4.3M |
| Apr 2026 | $6.7M | $5.2M | $1.6M |
| Mar 2026 | $6.1M | $19.8M | −$13.8M |
| Feb 2026 | $11.3M | $7.3M | $4.0M |
| Jan 2026 | $19.2M | $14.0M | $5.2M |
| Dec 2025 | $10.1M | $4.9M | $5.1M |
| Nov 2025 | $6.1M | $15.6M | −$9.5M |
| Oct 2025 | $11.6M | $7.3M | $4.3M |
| Sep 2025 | $7.9M | $7.7M | $162K |
| Aug 2025 | $6.4M | $4.9M | $1.5M |
| Jul 2025 | $60.6M | $3.4M | $57.2M |
| Jun 2025 | $7.5M | $3.9M | $3.6M |
MGBKX Assets Under Management
Net assets of MFS Global Opportunistic Bond Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-05-31 | $1.02B |
| 2026-02-28 | $1.05B |
| 2025-11-30 | $1.04B |
| 2025-08-31 | $1.03B |
| 2025-05-31 | $959.00M |
| 2025-02-28 | $1.03B |
| 2024-11-30 | $1.05B |
| 2024-08-31 | $1.04B |
| 2024-05-31 | $1.01B |
| 2024-02-29 | $1.00B |
| 2023-11-30 | $961.67M |
| 2023-08-31 | $981.80M |
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.