THMIX — Thornburg Intermediate Municipal Fund
Data updated: 2026-08-24
THMIX — Thornburg Intermediate Municipal Fund. Long Municipal - National Bond · $1.28B AUM · 0.48% expense ratio. Holdings, fees, performance and SEC filings.
THMIX Fund Overview
THMIX — Thornburg Intermediate Municipal Fund is a US mutual fund managed by Thornburg Investment Trust, categorised as Long Municipal - National Bond. ABC INVEST provides holdings, performance, costs, cashflows, risk data, prospectus documents and SEC filings, sourced from SEC filings.
- Type: US mutual fund
- Manager: Thornburg Investment Trust
- Category: Long Municipal - National Bond
- Assets under management: $1.28B
- 1-year return: 6.6%
- Ticker: THMIX
- SEC CIK: 0000816153
- SEC series ID: S000011844
- Share class ID: C000032356
THMIX Holdings
Top 10 holdings of Thornburg Intermediate Municipal Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| Kentucky Public Energy Authority | 1.23% |
| Black Belt Energy Gas District | 1.04% |
| Tennessee Energy Acquisition Corp | 0.98% |
| Port of Port Arthur Navigation District | 0.82% |
| Patriots Energy Group Financing Agency | 0.80% |
| Wisconsin Housing & Economic Development Authority Home Ownership Revenue | 0.73% |
| Colorado Health Facilities Authority | 0.73% |
| Texas Municipal Gas Acquisition & Supply Corp V | 0.70% |
| Wise County Industrial Development Authority | 0.69% |
| Port of Port Arthur Navigation District | 0.69% |
THMIX Portfolio Allocation
Asset-class allocation of Thornburg Intermediate Municipal Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Fixed Income | 98.1% |
| Securitized | 0.6% |
THMIX Performance
Total returns for THMIX (as of 2026-09-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 2.4% |
| 1 year | 6.6% |
| 3 years (annualised) | 4.4% |
| 5 years (annualised) | 1.7% |
THMIX Risk Information
Risk metrics for THMIX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 3.1%
THMIX Costs and Fees
THMIX costs about $48 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.48%
- Gross expense ratio: 0.66%
- Portfolio turnover: 53%
- Brokerage commissions: 0.00 bps of average net assets (SEC N-CEN)
THMIX Cashflows
Over the 12 months to 2026-06, Thornburg Intermediate Municipal Fund had net inflows of $209.75M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-06 | $2.15M |
| 2026-05 | $13.98M |
| 2026-04 | $13.54M |
| 2026-03 | $25.60M |
| 2026-02 | $20.29M |
| 2026-01 | $19.43M |
THMIX Debt Constituents
Largest debt holdings of Thornburg Intermediate Municipal Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| Kentucky Public Energy Authority | 1.23% |
| Black Belt Energy Gas District | 1.04% |
| Tennessee Energy Acquisition Corp | 0.98% |
| Port of Port Arthur Navigation District | 0.82% |
| Patriots Energy Group Financing Agency | 0.80% |
| Wisconsin Housing & Economic Development Authority Home Ownership Revenue | 0.73% |
| Colorado Health Facilities Authority | 0.73% |
| Texas Municipal Gas Acquisition & Supply Corp V | 0.70% |
| Wise County Industrial Development Authority | 0.69% |
| Port of Port Arthur Navigation District | 0.69% |
THMIX Prospectus and SEC Filings
Official Thornburg Intermediate Municipal Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
- Prospectus (485BPOS) — filed 2026-01-28
- Prospectus (485BPOS) — filed 2026-01-27
- Prospectus (485BPOS) — filed 2025-01-28
- Portfolio holdings (N-PORT) — filed 2026-08-24
- Portfolio holdings (N-PORT) — filed 2026-05-26
- Portfolio holdings (N-PORT) — filed 2026-02-20
- Annual census (N-CEN) — filed 2025-12-02
- Annual census (N-CEN) — filed 2024-12-02
Related Funds
Other Long Municipal - National Bond funds tracked on ABC INVEST:
Data Sources
ABC INVEST compiles this page from public filings made to the U.S. Securities and Exchange Commission (SEC) through EDGAR: portfolio holdings and monthly cashflows from Form N-PORT, expenses and returns from fund prospectuses (Form 485BPOS) and the SEC DERA Risk/Return Summary data sets, annual data from Form N-CEN, and shareholder reports from Form N-CSR.