BUIOX Performance — Buffalo Early Stage Growth Fund, Institutional Class
Data updated: 2026-08-21
BUIOX returned +20.90% year to date and +29.99% over one year to Jun 2026. Annualised returns are +8.99% over 3 years and −0.91% over 5 years. The fund trailed its US Small Growth category average: $100 invested three years ago grew to $129, against $156 for the category, and to $130 over one year, against $132. Volatility over the past three years was 19.76% a year. In the 12 months to Jun 2026 the fund lost a net $1.8M, and assets reached $75.48M.
BUIOX Growth of $100
What $100 invested in Buffalo Early Stage Growth Fund grew to, compounded from monthly returns reported on SEC Form N-PORT, against the US Small Growth category average over the same months.
| Period | BUIOX | Category average |
|---|---|---|
| 1 year (Jul 2025 – Jun 2026) | $130 | $132 |
| 3 years (Jul 2023 – Jun 2026) | $129 | $156 |
| 5 years (Jul 2021 – Jun 2026) | $96 | $127 |
| Since data start (Jul 2019 – Jun 2026) | $175 | $203 |
BUIOX Trailing Returns
Total returns to Jun 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +20.90% |
| 1 year | +29.99% |
| 3 years (annualised) | +8.99% |
| 5 years (annualised) | −0.91% |
BUIOX Annual Returns
Calendar-year total returns of Buffalo Early Stage Growth Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–Jun) | +20.90% |
| 2025 | +3.26% |
| 2024 | +7.53% |
| 2023 | +9.96% |
| 2022 | −30.66% |
| 2021 | +7.93% |
| 2020 | +47.97% |
| 2019 (Jul–Dec) | +6.77% |
BUIOX 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 | +2.7% | +2.0% | −9.4% | +9.6% | +7.1% | +8.5% | — | — | — | — | — | — |
| 2025 | +3.1% | −7.5% | −5.5% | −1.9% | +3.0% | +5.5% | +3.6% | +6.0% | −1.2% | −0.1% | −3.2% | +2.4% |
| 2024 | −3.2% | +5.0% | +3.2% | −6.3% | +4.5% | −1.1% | +7.5% | −0.5% | +1.0% | −3.1% | +8.0% | −6.2% |
| 2023 | +12.5% | −2.3% | −2.3% | −3.3% | +0.9% | +8.8% | +2.1% | −6.8% | −7.7% | −8.6% | +8.4% | +10.8% |
| 2022 | −11.9% | −0.1% | −1.7% | −9.5% | −2.3% | −8.9% | +9.4% | −2.1% | −9.9% | +8.9% | +0.7% | −6.1% |
| 2021 | +3.4% | +8.3% | −3.9% | +3.8% | −1.6% | +5.2% | −1.7% | +0.8% | −3.2% | +2.5% | −7.0% | +2.1% |
| 2020 | +0.4% | −7.4% | −19.7% | +18.9% | +10.1% | +7.6% | +4.9% | +3.3% | −0.5% | +1.1% | +12.6% | +14.7% |
| 2019 | — | — | — | — | — | — | −0.9% | −4.0% | −0.3% | +3.5% | +6.6% | +2.1% |
BUIOX Risk
Risk measures from monthly returns over Jul 2023 – Jun 2026.
- 3-year volatility (annualised): 19.76%
- 3-year Sharpe ratio: 0.23 (vs 4.5% risk-free rate)
- Best month: +10.76% (Dec 2023)
- Worst month: −9.42% (Mar 2026)
BUIOX Fund Flows
Monthly money in and out of Buffalo Early Stage Growth Fund, from SEC Form N-PORT.
- 12-month net flow: −$1.8M
- 12-month gross sales (incl. reinvestments): $12.0M
- Sales ÷ redemptions: 0.87×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| Jun 2026 | $265K | $1.2M | −$897K |
| May 2026 | $175K | $1.0M | −$854K |
| Apr 2026 | $270K | $834K | −$563K |
| Mar 2026 | $673K | $878K | −$206K |
| Feb 2026 | $249K | $1.6M | −$1.3M |
| Jan 2026 | $485K | $1.2M | −$716K |
| Dec 2025 | $3.4M | $1.3M | $2.1M |
| Nov 2025 | $231K | $928K | −$697K |
| Oct 2025 | $576K | $1.1M | −$539K |
| Sep 2025 | $595K | $1.0M | −$435K |
| Aug 2025 | $724K | $1.4M | −$641K |
| Jul 2025 | $4.4M | $1.4M | $3.0M |
BUIOX Assets Under Management
Net assets of Buffalo Early Stage Growth Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-06-30 | $75.48M |
| 2026-03-31 | $61.30M |
| 2025-12-31 | $66.69M |
| 2025-09-30 | $69.78M |
| 2025-06-30 | $62.40M |
| 2025-03-31 | $60.56M |
| 2024-12-31 | $69.57M |
| 2024-09-30 | $73.94M |
| 2024-06-30 | $72.05M |
| 2024-03-31 | $78.24M |
| 2023-12-31 | $80.21M |
| 2023-09-30 | $75.65M |
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.