THMIX Performance — Thornburg Intermediate Municipal Fund, Class I
Data updated: 2026-08-24
THMIX returned +2.44% year to date and +6.59% over one year to Jun 2026. Annualised returns are +4.36% over 3 years and +1.73% over 5 years. The fund beat its Intermediate Municipal Bond category average: $100 invested three years ago grew to $114, against $111 for the category, and to $107 over one year, against $106. Volatility over the past three years was 4.03% a year. In the 12 months to Jun 2026 the fund took in a net $209.7M, and assets reached $1.28B.
THMIX Growth of $100
What $100 invested in Thornburg Intermediate Municipal 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 | THMIX | Category average |
|---|---|---|
| 1 year (Jul 2025 – Jun 2026) | $107 | $106 |
| 3 years (Jul 2023 – Jun 2026) | $114 | $111 |
| 5 years (Jul 2021 – Jun 2026) | $109 | $105 |
| Since data start (Jul 2019 – Jun 2026) | $117 | $112 |
THMIX Trailing Returns
Total returns to Jun 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +2.44% |
| 1 year | +6.59% |
| 3 years (annualised) | +4.36% |
| 5 years (annualised) | +1.73% |
THMIX Annual Returns
Calendar-year total returns of Thornburg Intermediate Municipal Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–Jun) | +2.44% |
| 2025 | +4.92% |
| 2024 | +2.02% |
| 2023 | +5.70% |
| 2022 | −6.13% |
| 2021 | +1.23% |
| 2020 | +4.08% |
| 2019 (Jul–Dec) | +1.71% |
THMIX 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 | +0.9% | +1.1% | −1.8% | +0.9% | +0.5% | +0.9% | — | — | — | — | — | — |
| 2025 | +0.8% | +0.9% | −1.3% | −0.4% | +0.2% | +0.6% | −0.1% | +0.8% | +1.9% | +1.2% | +0.2% | 0.0% |
| 2024 | −0.2% | +0.2% | +0.3% | −0.8% | −0.1% | +1.2% | +0.8% | +0.6% | +0.9% | −1.1% | +1.3% | −1.2% |
| 2023 | +1.9% | −1.5% | +1.5% | 0.0% | −0.6% | +0.7% | +0.5% | −0.8% | −1.8% | −0.5% | +4.4% | +1.8% |
| 2022 | −2.3% | −0.4% | −2.6% | −2.0% | +1.1% | −0.8% | +1.9% | −1.4% | −2.4% | −0.5% | +2.8% | +0.4% |
| 2021 | +0.6% | −1.2% | +0.5% | +0.6% | +0.2% | +0.3% | +0.6% | −0.1% | −0.6% | −0.4% | +0.6% | +0.1% |
| 2020 | +1.6% | +1.2% | −3.7% | −1.1% | +2.3% | +1.1% | +1.5% | −0.3% | 0.0% | −0.3% | +1.2% | +0.6% |
| 2019 | — | — | — | — | — | — | +0.7% | +1.2% | −0.7% | +0.1% | +0.1% | +0.2% |
THMIX Risk
Risk measures from monthly returns over Jul 2023 – Jun 2026.
- 3-year volatility (annualised): 4.03%
- 3-year Sharpe ratio: -0.03 (vs 4.5% risk-free rate)
- Best month: +4.44% (Nov 2023)
- Worst month: −1.79% (Sep 2023)
THMIX Fund Flows
Monthly money in and out of Thornburg Intermediate Municipal Fund, from SEC Form N-PORT.
- 12-month net flow: $209.7M
- 12-month gross sales (incl. reinvestments): $440.2M
- Sales ÷ redemptions: 1.91×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| Jun 2026 | $26.2M | $24.0M | $2.2M |
| May 2026 | $32.4M | $18.4M | $14.0M |
| Apr 2026 | $32.2M | $18.7M | $13.5M |
| Mar 2026 | $39.1M | $13.5M | $25.6M |
| Feb 2026 | $30.1M | $9.8M | $20.3M |
| Jan 2026 | $38.4M | $19.0M | $19.4M |
| Dec 2025 | $46.7M | $25.9M | $20.7M |
| Nov 2025 | $32.0M | $15.9M | $16.2M |
| Oct 2025 | $62.5M | $21.6M | $41.0M |
| Sep 2025 | $39.8M | $21.8M | $18.0M |
| Aug 2025 | $28.8M | $23.0M | $5.8M |
| Jul 2025 | $32.0M | $19.0M | $13.1M |
THMIX Assets Under Management
Net assets of Thornburg Intermediate Municipal Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-06-30 | $1.28B |
| 2026-03-31 | $1.23B |
| 2025-12-31 | $1.18B |
| 2025-09-30 | $1.09B |
| 2025-06-30 | $1.04B |
| 2025-03-31 | $1.02B |
| 2024-12-31 | $1.01B |
| 2024-09-30 | $1.02B |
| 2024-06-30 | $987.76M |
| 2024-03-31 | $982.24M |
| 2023-12-31 | $976.17M |
| 2023-09-30 | $861.81M |
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.