BUIIX Performance — Buffalo International Fund, Institutional Class
Data updated: 2026-08-21
BUIIX returned +21.01% year to date and +20.68% over one year to Jun 2026. Annualised returns are +12.49% over 3 years and +6.56% over 5 years. Against its International Large Blend category average the fund came out behind over three years but ahead over one: $100 invested three years ago grew to $142, against $155 for the category, and to $121 over one year, against $119. Volatility over the past three years was 16.06% a year. In the 12 months to Jun 2026 the fund lost a net $175.9M, and assets reached $916.79M.
BUIIX Growth of $100
What $100 invested in Buffalo International 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 | BUIIX | Category average |
|---|---|---|
| 1 year (Jul 2025 – Jun 2026) | $121 | $119 |
| 3 years (Jul 2023 – Jun 2026) | $142 | $155 |
| 5 years (Jul 2021 – Jun 2026) | $137 | $146 |
| Since data start (Jul 2019 – Jun 2026) | $196 | $189 |
BUIIX Trailing Returns
Total returns to Jun 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +21.01% |
| 1 year | +20.68% |
| 3 years (annualised) | +12.49% |
| 5 years (annualised) | +6.56% |
BUIIX Annual Returns
Calendar-year total returns of Buffalo International Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–Jun) | +21.01% |
| 2025 | +17.27% |
| 2024 | −1.72% |
| 2023 | +18.48% |
| 2022 | −21.65% |
| 2021 | +18.42% |
| 2020 | +19.23% |
| 2019 (Jul–Dec) | +7.25% |
BUIIX 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 | +5.1% | +3.9% | −10.2% | +9.9% | +8.0% | +3.9% | — | — | — | — | — | — |
| 2025 | +6.1% | +1.8% | −2.6% | +4.5% | +3.3% | +3.5% | −4.4% | +1.5% | +1.8% | +1.0% | −2.6% | +2.5% |
| 2024 | −1.5% | +4.8% | +2.2% | −5.2% | +4.5% | −1.6% | +2.5% | +3.9% | −0.3% | −5.4% | −1.3% | −3.7% |
| 2023 | +9.5% | −1.7% | +4.5% | +0.5% | −1.1% | +3.8% | +1.1% | −4.1% | −5.3% | −4.2% | +10.4% | +5.1% |
| 2022 | −8.5% | −4.1% | +0.5% | −8.0% | +0.1% | −9.4% | +8.3% | −7.3% | −8.3% | +5.9% | +12.5% | −2.9% |
| 2021 | −0.3% | +0.9% | +1.7% | +4.7% | +3.7% | +0.4% | +3.3% | +3.4% | −5.3% | +4.2% | −2.8% | +3.7% |
| 2020 | −1.4% | −6.1% | −13.3% | +8.6% | +6.7% | +2.6% | +6.5% | +4.3% | −0.4% | −3.8% | +12.2% | +4.7% |
| 2019 | — | — | — | — | — | — | −2.3% | −1.5% | +1.6% | +3.5% | +2.7% | +3.2% |
BUIIX Risk
Risk measures from monthly returns over Jul 2023 – Jun 2026.
- 3-year volatility (annualised): 16.06%
- 3-year Sharpe ratio: 0.50 (vs 4.5% risk-free rate)
- Best month: +10.39% (Nov 2023)
- Worst month: −10.16% (Mar 2026)
BUIIX Fund Flows
Monthly money in and out of Buffalo International Fund, from SEC Form N-PORT.
- 12-month net flow: −$175.9M
- 12-month gross sales (incl. reinvestments): $141.2M
- Sales ÷ redemptions: 0.45×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| Jun 2026 | $7.2M | $17.2M | −$10.0M |
| May 2026 | $6.4M | $42.1M | −$35.7M |
| Apr 2026 | $6.1M | $22.3M | −$16.2M |
| Mar 2026 | $9.1M | $30.9M | −$21.8M |
| Feb 2026 | $8.4M | $35.1M | −$26.8M |
| Jan 2026 | $9.2M | $29.2M | −$20.0M |
| Dec 2025 | $17.9M | $48.7M | −$30.8M |
| Nov 2025 | $12.0M | $27.8M | −$15.8M |
| Oct 2025 | $18.2M | $21.5M | −$3.3M |
| Sep 2025 | $12.3M | $12.5M | −$191K |
| Aug 2025 | $21.3M | $13.7M | $7.6M |
| Jul 2025 | $13.0M | $16.0M | −$3.0M |
BUIIX Assets Under Management
Net assets of Buffalo International Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-06-30 | $916.79M |
| 2026-03-31 | $797.89M |
| 2025-12-31 | $879.86M |
| 2025-09-30 | $931.07M |
| 2025-06-30 | $937.68M |
| 2025-03-31 | $878.54M |
| 2024-12-31 | $890.74M |
| 2024-09-30 | $1.08B |
| 2024-06-30 | $1.05B |
| 2024-03-31 | $1.08B |
| 2023-12-31 | $934.67M |
| 2023-09-30 | $753.84M |
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.