TIBAX — Thornburg Investment Income Builder Fund
Data updated: 2026-08-24
TIBAX — Thornburg Investment Income Builder Fund. Developed ex-US Large Cap Blend / Core Equity · $22.50B AUM. Holdings, fees, performance and SEC filings.
TIBAX Fund Overview
TIBAX — 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: $22.50B
- 1-year return: 32.7%
- Ticker: TIBAX
- SEC CIK: 0000816153
- SEC series ID: S000011851
- Share class ID: C000032380
TIBAX 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 |
|---|---|
| Thornburg Capital Management Fund | 7.50% |
| Orange SA | 6.04% |
| Taiwan Semiconductor Manufacturing Co Ltd | 5.93% |
| Samsung Electronics Co Ltd | 4.49% |
| BNP Paribas SA | 4.48% |
| Citigroup Inc | 4.06% |
| NN Group NV | 3.73% |
| Broadcom Inc | 2.90% |
| TotalEnergies SE | 2.86% |
| AT&T Inc | 2.81% |
TIBAX 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 | 93.9% |
| Fixed Income | 3.7% |
| Securitized | 1.9% |
| Loans | 0.2% |
TIBAX Performance
Total returns for TIBAX (as of 2026-09-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 16.1% |
| 1 year | 32.7% |
| 3 years (annualised) | 24.8% |
| 5 years (annualised) | 15.8% |
TIBAX Risk Information
Risk metrics for TIBAX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 10.4%
TIBAX Costs and Fees
TIBAX costs about $115 per $10,000 invested per year in fund expenses.
- Net expense ratio: 1.15%
- Gross expense ratio: 1.15%
- Portfolio turnover: 28%
- Brokerage commissions: 5.90 bps of average net assets (SEC N-CEN)
TIBAX Cashflows
Over the 12 months to 2026-06, Thornburg Investment Income Builder Fund had net inflows of $1.84B, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-06 | $208.92M |
| 2026-05 | $81.88M |
| 2026-04 | $91.02M |
| 2026-03 | $134.29M |
| 2026-02 | $145.15M |
| 2026-01 | $138.45M |
TIBAX 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 | 0.42% |
| Bank Of Ny Mellon Corp. | 0.19% |
| Cobank Acb | 0.13% |
| Deutsche Telekom Int Fin | 0.13% |
| Booz Allen Hamilton, Inc. | 0.11% |
| Kinder Morgan, Inc. | 0.11% |
| Energean Israel Finance | 0.09% |
| Kehe Dist/fin / Nextwave | 0.08% |
| Fair Isaac Corp. | 0.08% |
| Pegasus Hava Tasimacilig | 0.07% |
TIBAX Prospectus and SEC Filings
Official Thornburg Investment Income Builder Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
- Prospectus (485BPOS) — filed 2026-01-28
- Prospectus supplement (497) — filed 2026-08-21
- Prospectus supplement (497) — filed 2026-08-21
- 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 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.