TIBMX Performance — Thornburg Investment Income Builder Fund, Class R5
Data updated: 2026-08-24
TIBMX returned +16.12% year to date and +32.88% over one year to Jun 2026. Annualised returns are +24.93% over 3 years and +15.99% over 5 years. The fund beat its International Large Blend category average: $100 invested three years ago grew to $195, against $155 for the category, and to $133 over one year, against $119. Volatility over the past three years was 9.17% a year. In the 12 months to Jun 2026 the fund took in a net $1.8B, and assets reached $22.50B.
TIBMX Growth of $100
What $100 invested in Thornburg Investment Income Builder Fund grew to, compounded from monthly returns reported on SEC Form N-PORT, against the International Large Blend category average over the same months.
| Period | TIBMX | Category average |
|---|---|---|
| 1 year (Jul 2025 – Jun 2026) | $133 | $119 |
| 3 years (Jul 2023 – Jun 2026) | $195 | $155 |
| 5 years (Jul 2021 – Jun 2026) | $210 | $146 |
| Since data start (Jul 2019 – Jun 2026) | $251 | $189 |
TIBMX Trailing Returns
Total returns to Jun 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +16.12% |
| 1 year | +32.88% |
| 3 years (annualised) | +24.93% |
| 5 years (annualised) | +15.99% |
TIBMX Annual Returns
Calendar-year total returns of Thornburg Investment Income Builder Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–Jun) | +16.12% |
| 2025 | +36.92% |
| 2024 | +13.33% |
| 2023 | +18.10% |
| 2022 | −8.15% |
| 2021 | +20.28% |
| 2020 | −0.62% |
| 2019 (Jul–Dec) | +7.36% |
TIBMX 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 | +6.5% | +7.2% | −3.6% | +4.7% | +2.3% | −1.4% | — | — | — | — | — | — |
| 2025 | +4.3% | +3.5% | +0.8% | +1.3% | +4.8% | +3.6% | +1.5% | +3.3% | +2.3% | +1.1% | +3.4% | +2.1% |
| 2024 | +0.4% | +0.2% | +5.2% | −1.3% | +4.0% | 0.0% | +3.8% | +2.4% | +0.1% | −1.6% | −0.4% | +0.1% |
| 2023 | +6.1% | −0.5% | −0.2% | +2.6% | −2.8% | +3.8% | +2.8% | −1.4% | −1.6% | −1.8% | +6.0% | +4.2% |
| 2022 | +0.6% | −2.9% | +0.3% | −4.5% | +3.6% | −7.7% | +2.1% | −2.8% | −8.0% | +6.2% | +8.4% | −2.4% |
| 2021 | +1.6% | +3.5% | +3.4% | +1.7% | +2.4% | −1.0% | +0.1% | +2.1% | −2.6% | +4.0% | −1.1% | +5.0% |
| 2020 | −1.5% | −7.0% | −19.4% | +8.5% | +3.7% | +2.1% | +2.4% | +2.1% | −3.4% | −1.8% | +14.1% | +3.5% |
| 2019 | — | — | — | — | — | — | −0.5% | −0.8% | +3.2% | +1.9% | +0.7% | +2.7% |
TIBMX Risk
Risk measures from monthly returns over Jul 2023 – Jun 2026.
- 3-year volatility (annualised): 9.17%
- 3-year Sharpe ratio: 2.23 (vs 4.5% risk-free rate)
- Best month: +7.16% (Feb 2026)
- Worst month: −3.65% (Mar 2026)
TIBMX Fund Flows
Monthly money in and out of Thornburg Investment Income Builder Fund, from SEC Form N-PORT.
- 12-month net flow: $1.8B
- 12-month gross sales (incl. reinvestments): $4.8B
- Sales ÷ redemptions: 1.62×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| Jun 2026 | $479.4M | $270.5M | $208.9M |
| May 2026 | $290.8M | $208.9M | $81.9M |
| Apr 2026 | $377.5M | $286.4M | $91.0M |
| Mar 2026 | $480.9M | $346.6M | $134.3M |
| Feb 2026 | $403.7M | $258.6M | $145.1M |
| Jan 2026 | $364.5M | $226.0M | $138.5M |
| Dec 2025 | $484.9M | $242.7M | $242.1M |
| Nov 2025 | $594.7M | $247.8M | $347.0M |
| Oct 2025 | $256.7M | $238.8M | $17.9M |
| Sep 2025 | $425.5M | $231.4M | $194.1M |
| Aug 2025 | $335.4M | $251.4M | $84.0M |
| Jul 2025 | $309.1M | $158.5M | $150.7M |
TIBMX Assets Under Management
Net assets of Thornburg Investment Income Builder Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-06-30 | $22.50B |
| 2026-03-31 | $21.10B |
| 2025-12-31 | $18.95B |
| 2025-09-30 | $17.73B |
| 2025-06-30 | $16.30B |
| 2025-03-31 | $14.71B |
| 2024-12-31 | $13.53B |
| 2024-09-30 | $13.93B |
| 2024-06-30 | $13.15B |
| 2024-03-31 | $12.91B |
| 2023-12-31 | $12.34B |
| 2023-09-30 | $11.43B |
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.