TSSIX — Thornburg Strategic Municipal Income Fund
Data updated: 2026-05-26
TSSIX — Thornburg Strategic Municipal Income Fund data: holdings, portfolio allocation, expenses, performance, cashflows, risk and SEC filings. Long Municipal - National Bond · $405.33M AUM · 0.59% expense ratio · 3.9% 1-yr return. From SEC regulatory filings.
TSSIX Fund Overview
TSSIX — Thornburg Strategic Municipal Income 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: $405.33M
- 1-year return: 3.9%
- Ticker: TSSIX
- SEC CIK: 0000816153
- SEC series ID: S000025152
- Share class ID: C000075020
TSSIX Holdings
Top 10 holdings of Thornburg Strategic Municipal Income Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| Kentucky Public Energy Authority | 1.37% |
| Patriots Energy Group Financing Agency | 1.32% |
| Kentucky Public Energy Authority | 1.31% |
| Health & Educational Facilities Authority of the State of Missouri | 1.09% |
| California Community Choice Financing Authority | 1.09% |
| Tarrant County Housing Finance Corp | 0.99% |
| Main Street Natural Gas Inc | 0.96% |
| Buckeye Tobacco Settlement Financing Authority | 0.89% |
| San Antonio Housing Trust Public Facility Corp | 0.86% |
| Chandler Industrial Development Authority | 0.84% |
TSSIX Portfolio Allocation
Asset-class allocation of Thornburg Strategic Municipal Income Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Fixed Income | 99.5% |
TSSIX Performance
Total returns for TSSIX (as of 2026-08-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 0.0% |
| 1 year | 3.9% |
| 3 years (annualised) | 3.7% |
| 5 years (annualised) | 1.2% |
TSSIX Risk Information
Risk metrics for TSSIX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 3.4%
TSSIX Costs and Fees
TSSIX costs about $59 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.59%
- Gross expense ratio: 1.01%
- Portfolio turnover: 59%
- Brokerage commissions: 0.00 bps of average net assets (SEC N-CEN)
TSSIX Cashflows
Over the 12 months to 2026-03, Thornburg Strategic Municipal Income Fund had net inflows of $43.23M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-03 | $3.71M |
| 2026-02 | $4.69M |
| 2026-01 | −$390.36K |
| 2025-12 | $12.29M |
| 2025-11 | $5.91M |
| 2025-10 | $4.13M |
TSSIX Debt Constituents
Largest debt holdings of Thornburg Strategic Municipal Income Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| Kentucky Public Energy Authority | 1.37% |
| Patriots Energy Group Financing Agency | 1.32% |
| Kentucky Public Energy Authority | 1.31% |
| Health & Educational Facilities Authority of the State of Missouri | 1.09% |
| California Community Choice Financing Authority | 1.09% |
| Tarrant County Housing Finance Corp | 0.99% |
| Main Street Natural Gas Inc | 0.96% |
| Buckeye Tobacco Settlement Financing Authority | 0.89% |
| San Antonio Housing Trust Public Facility Corp | 0.86% |
| Chandler Industrial Development Authority | 0.84% |
TSSIX Prospectus and SEC Filings
Official Thornburg Strategic Municipal Income Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
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.