TIBOX — Thornburg Investment Income Builder Fund
Data updated: 2026-05-26
TIBOX — Thornburg Investment Income Builder Fund data: holdings, portfolio allocation, expenses, performance, cashflows, risk and SEC filings. Developed ex-US Large Cap Blend / Core Equity · $21.10B AUM · 0.84% expense ratio · 38.6% 1-yr return. From SEC regulatory filings.
TIBOX Fund Overview
TIBOX — Thornburg Investment Income Builder Fund is a US mutual fund managed by Thornburg Investment Trust, categorised as Developed ex-US Large Cap Blend / Core Equity. 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: Developed ex-US Large Cap Blend / Core Equity
- Assets under management: $21.10B
- 1-year return: 38.6%
- Ticker: TIBOX
- SEC CIK: 0000816153
- SEC series ID: S000011851
- Share class ID: C000177479
TIBOX Holdings
Top 10 holdings of Thornburg Investment Income Builder Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| Orange SA | 7.01% |
| Thornburg Capital Management Fund | 5.73% |
| Taiwan Semiconductor Manufacturing Co Ltd | 4.84% |
| Citigroup Inc | 3.76% |
| AT&T Inc | 3.71% |
| TotalEnergies SE | 3.60% |
| BNP Paribas SA | 3.56% |
| NN Group NV | 3.55% |
| Samsung Electronics Co Ltd | 3.07% |
| Broadcom Inc | 2.98% |
TIBOX Portfolio Allocation
Asset-class allocation of Thornburg Investment Income Builder Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Equity | 93.4% |
| Fixed Income | 4.0% |
| Securitized | 2.2% |
| Loans | 0.3% |
TIBOX Performance
Total returns for TIBOX (as of 2026-08-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 10.0% |
| 1 year | 38.6% |
| 3 years (annualised) | 24.3% |
| 5 years (annualised) | 15.6% |
TIBOX Risk Information
Risk metrics for TIBOX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 9.7%
TIBOX Costs and Fees
TIBOX costs about $84 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.84%
- Gross expense ratio: 0.87%
- Portfolio turnover: 28%
- Brokerage commissions: 5.90 bps of average net assets (SEC N-CEN)
TIBOX Cashflows
Over the 12 months to 2026-03, Thornburg Investment Income Builder Fund had net inflows of $1.72B, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-03 | $134.29M |
| 2026-02 | $145.15M |
| 2026-01 | $138.45M |
| 2025-12 | $242.14M |
| 2025-11 | $346.96M |
| 2025-10 | $17.94M |
TIBOX Debt Constituents
Largest debt holdings of Thornburg Investment Income Builder Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| Telefonica Emisiones Sau | 0.45% |
| Bank Of Ny Mellon Corp. | 0.16% |
| Emera, Inc. | 0.15% |
| Deutsche Telekom Int Fin | 0.14% |
| Cobank Acb | 0.14% |
| Kehe Dist/fin / Nextwave | 0.12% |
| Kinder Morgan, Inc. | 0.11% |
| Fair Isaac Corp. | 0.08% |
| Pegasus Hava Tasimacilig | 0.07% |
| Metlife, Inc. | 0.07% |
TIBOX Prospectus and SEC Filings
Official Thornburg Investment Income Builder Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
Related Funds
Other Developed ex-US Large Cap Blend / Core Equity 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.