GWMIX Performance — AMG GW&K Municipal Bond Fund, Class I
Data updated: 2026-08-28
GWMIX returned +1.70% year to date and +7.23% over one year to Jun 2026. Annualised returns are +3.70% over 3 years and +1.06% over 5 years. The fund beat its Intermediate Municipal Bond category average: $100 invested three years ago grew to $112, against $111 for the category, and to $107 over one year, against $106. Volatility over the past three years was 5.84% a year. In the 12 months to Jun 2026 the fund took in a net $34.7M, and assets reached $999.38M.
GWMIX Growth of $100
What $100 invested in AMG GW&K Municipal Bond Fund grew to, compounded from monthly returns reported on SEC Form N-PORT, against the Intermediate Municipal Bond category average over the same months.
| Period | GWMIX | Category average |
|---|---|---|
| 1 year (Jul 2025 – Jun 2026) | $107 | $106 |
| 3 years (Jul 2023 – Jun 2026) | $112 | $111 |
| 5 years (Jul 2021 – Jun 2026) | $105 | $105 |
| Since data start (Jul 2019 – Jun 2026) | $113 | $112 |
GWMIX Trailing Returns
Total returns to Jun 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +1.70% |
| 1 year | +7.23% |
| 3 years (annualised) | +3.70% |
| 5 years (annualised) | +1.06% |
GWMIX Annual Returns
Calendar-year total returns of AMG GW&K Municipal Bond Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–Jun) | +1.70% |
| 2025 | +5.54% |
| 2024 | +0.04% |
| 2023 | +6.02% |
| 2022 | −7.45% |
| 2021 | +0.42% |
| 2020 | +4.71% |
| 2019 (Jul–Dec) | +1.88% |
GWMIX 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 | +1.3% | +1.3% | −3.2% | +1.3% | +0.4% | +0.7% | — | — | — | — | — | — |
| 2025 | +0.7% | +1.2% | −2.2% | −0.5% | +0.1% | +0.9% | −0.2% | +1.0% | +2.4% | +1.5% | +0.3% | +0.3% |
| 2024 | −0.4% | 0.0% | −0.2% | −1.4% | −0.9% | +1.7% | +0.9% | +0.8% | +1.0% | −1.8% | +1.7% | −1.3% |
| 2023 | +3.1% | −2.5% | +2.3% | −0.2% | −1.3% | +0.8% | +0.4% | −1.2% | −2.9% | −0.9% | +6.0% | +2.7% |
| 2022 | −3.1% | −0.6% | −3.3% | −2.9% | +1.8% | −1.4% | +3.2% | −2.3% | −3.7% | −0.4% | +4.9% | +0.4% |
| 2021 | +0.4% | −1.7% | +0.4% | +0.8% | +0.2% | +0.2% | +0.8% | −0.4% | −0.9% | −0.4% | +0.8% | +0.2% |
| 2020 | +1.8% | +1.0% | −3.3% | −1.2% | +3.2% | +0.7% | +1.3% | −0.4% | −0.1% | −0.2% | +1.3% | +0.5% |
| 2019 | — | — | — | — | — | — | +0.9% | +1.5% | −1.0% | +0.1% | +0.1% | +0.3% |
GWMIX Risk
Risk measures from monthly returns over Jul 2023 – Jun 2026.
- 3-year volatility (annualised): 5.84%
- 3-year Sharpe ratio: -0.14 (vs 4.5% risk-free rate)
- Best month: +6.00% (Nov 2023)
- Worst month: −3.21% (Mar 2026)
GWMIX Fund Flows
Monthly money in and out of AMG GW&K Municipal Bond Fund, from SEC Form N-PORT.
- 12-month net flow: $34.7M
- 12-month gross sales (incl. reinvestments): $283.0M
- Sales ÷ redemptions: 1.14×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| Jun 2026 | $26.5M | $24.8M | $1.7M |
| May 2026 | $18.4M | $17.3M | $1.1M |
| Apr 2026 | $24.7M | $18.4M | $6.2M |
| Mar 2026 | $27.9M | $20.4M | $7.5M |
| Feb 2026 | $18.8M | $14.2M | $4.6M |
| Jan 2026 | $28.7M | $24.1M | $4.6M |
| Dec 2025 | $32.5M | $21.6M | $10.8M |
| Nov 2025 | $19.3M | $16.3M | $3.0M |
| Oct 2025 | $23.0M | $25.3M | −$2.2M |
| Sep 2025 | $23.8M | $20.1M | $3.7M |
| Aug 2025 | $16.3M | $20.5M | −$4.2M |
| Jul 2025 | $23.1M | $25.2M | −$2.1M |
GWMIX Assets Under Management
Net assets of AMG GW&K Municipal Bond Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-06-30 | $999.38M |
| 2026-03-31 | $975.23M |
| 2025-12-31 | $972.43M |
| 2025-09-30 | $947.05M |
| 2025-06-30 | $928.14M |
| 2025-03-31 | $987.87M |
| 2024-12-31 | $1.01B |
| 2024-09-30 | $1.05B |
| 2024-06-28 | $1.01B |
| 2024-03-28 | $1.04B |
| 2023-12-29 | $1.03B |
| 2023-09-29 | $1.02B |
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.