MFGBX Performance — MFS Government Securities Fund, Class B
Data updated: 2026-07-23
MFGBX returned −0.47% year to date and +3.17% over one year to May 2026. Annualised returns are +2.00% over 3 years and −1.26% over 5 years. The fund trailed its Intermediate Securitized Bond category average: $100 invested three years ago grew to $106, against $116 for the category, and to $103 over one year, against $106. Volatility over the past three years was 5.61% a year. In the 12 months to May 2026 the fund took in a net $52.3M, and assets reached $1.93B.
MFGBX Growth of $100
What $100 invested in MFS Government Securities Fund grew to, compounded from monthly returns reported on SEC Form N-PORT, against the Intermediate Securitized Bond category average over the same months.
| Period | MFGBX | Category average |
|---|---|---|
| 1 year (Jun 2025 – May 2026) | $103 | $106 |
| 3 years (Jun 2023 – May 2026) | $106 | $116 |
| 5 years (Jun 2021 – May 2026) | $94 | $105 |
| Since data start (Sep 2019 – May 2026) | $95 | $111 |
MFGBX Trailing Returns
Total returns to May 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | −0.47% |
| 1 year | +3.17% |
| 3 years (annualised) | +2.00% |
| 5 years (annualised) | −1.26% |
MFGBX Annual Returns
Calendar-year total returns of MFS Government Securities Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–May) | −0.47% |
| 2025 | +5.81% |
| 2024 | −0.30% |
| 2023 | +3.17% |
| 2022 | −13.00% |
| 2021 | −2.91% |
| 2020 | +5.55% |
| 2019 (Sep–Dec) | −1.34% |
MFGBX 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 | +0.1% | +1.6% | −2.1% | 0.0% | −0.1% | — | — | — | — | — | — | — |
| 2025 | +0.5% | +2.2% | 0.0% | +0.6% | −1.2% | +1.4% | −0.6% | +1.4% | +0.6% | +0.6% | +0.6% | −0.4% |
| 2024 | −0.4% | −1.6% | +0.7% | −2.6% | +1.6% | +1.1% | +2.0% | +1.4% | +1.1% | −2.8% | +0.9% | −1.6% |
| 2023 | +2.9% | −2.4% | +2.3% | +0.5% | −1.2% | −0.9% | −0.4% | −0.7% | −2.7% | −1.7% | +4.0% | +3.7% |
| 2022 | −1.6% | −0.8% | −2.7% | −3.1% | +0.1% | −1.2% | +2.0% | −2.8% | −4.1% | −1.6% | +3.1% | −0.8% |
| 2021 | −0.5% | −1.6% | −0.9% | +0.5% | −0.1% | +0.3% | +0.7% | −0.2% | −0.8% | −0.2% | +0.2% | −0.5% |
| 2020 | +1.8% | +1.8% | +1.2% | +0.7% | 0.0% | +0.2% | +0.8% | −0.6% | 0.0% | −0.6% | +0.2% | −0.1% |
| 2019 | — | — | — | — | — | — | — | — | −0.6% | 0.0% | −0.3% | −0.5% |
MFGBX Risk
Risk measures from monthly returns over Jun 2023 – May 2026.
- 3-year volatility (annualised): 5.61%
- 3-year Sharpe ratio: -0.45 (vs 4.5% risk-free rate)
- Best month: +4.05% (Nov 2023)
- Worst month: −2.80% (Oct 2024)
MFGBX Fund Flows
Monthly money in and out of MFS Government Securities Fund, from SEC Form N-PORT.
- 12-month net flow: $52.3M
- 12-month gross sales (incl. reinvestments): $342.3M
- Sales ÷ redemptions: 1.18×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| May 2026 | $20.5M | $18.8M | $1.7M |
| Apr 2026 | $17.0M | $20.4M | −$3.4M |
| Mar 2026 | $18.1M | $54.9M | −$36.8M |
| Feb 2026 | $23.7M | $26.5M | −$2.9M |
| Jan 2026 | $22.3M | $19.2M | $3.1M |
| Dec 2025 | $26.1M | $29.8M | −$3.7M |
| Nov 2025 | $26.2M | $16.3M | $9.9M |
| Oct 2025 | $36.8M | $25.6M | $11.2M |
| Sep 2025 | $22.4M | $26.2M | −$3.8M |
| Aug 2025 | $18.2M | $21.7M | −$3.4M |
| Jul 2025 | $92.8M | $15.4M | $77.4M |
| Jun 2025 | $18.1M | $15.1M | $3.1M |
MFGBX Assets Under Management
Net assets of MFS Government Securities Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-05-31 | $1.93B |
| 2026-02-28 | $2.03B |
| 2025-11-30 | $2.02B |
| 2025-08-31 | $1.98B |
| 2025-05-31 | $1.87B |
| 2025-02-28 | $2.04B |
| 2024-11-30 | $2.09B |
| 2024-08-31 | $2.07B |
| 2024-05-31 | $2.12B |
| 2024-02-29 | $2.14B |
| 2023-11-30 | $2.15B |
| 2023-08-31 | $2.24B |
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.