BUIMX Performance — Buffalo Mid Cap Growth Fund, Institutional Class
Data updated: 2026-08-21
BUIMX returned +1.16% year to date and −5.10% over one year to Jun 2026. Annualised returns are +4.69% over 3 years and +0.32% over 5 years. The fund trailed its US Mid-Cap Growth category average: $100 invested three years ago grew to $115, against $152 for the category, and to $95 over one year, against $118. Volatility over the past three years was 16.37% a year. In the 12 months to Jun 2026 the fund lost a net $11.8M, and assets reached $113.32M.
BUIMX Growth of $100
What $100 invested in Buffalo Mid Cap Growth Fund grew to, compounded from monthly returns reported on SEC Form N-PORT, against the US Mid-Cap Growth category average over the same months.
| Period | BUIMX | Category average |
|---|---|---|
| 1 year (Jul 2025 – Jun 2026) | $95 | $118 |
| 3 years (Jul 2023 – Jun 2026) | $115 | $152 |
| 5 years (Jul 2021 – Jun 2026) | $102 | $129 |
| Since data start (Jul 2019 – Jun 2026) | $161 | $203 |
BUIMX Trailing Returns
Total returns to Jun 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +1.16% |
| 1 year | −5.10% |
| 3 years (annualised) | +4.69% |
| 5 years (annualised) | +0.32% |
BUIMX Annual Returns
Calendar-year total returns of Buffalo Mid Cap Growth Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–Jun) | +1.16% |
| 2025 | −1.50% |
| 2024 | +6.85% |
| 2023 | +27.19% |
| 2022 | −27.70% |
| 2021 | +14.73% |
| 2020 | +34.41% |
| 2019 (Jul–Dec) | +6.71% |
BUIMX 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 | −1.8% | −0.4% | −7.1% | +5.1% | +1.5% | +4.4% | — | — | — | — | — | — |
| 2025 | +5.3% | −4.1% | −5.3% | −0.6% | +5.8% | +4.4% | +0.8% | −1.0% | −1.1% | −1.2% | −2.2% | −1.6% |
| 2024 | −1.0% | +4.8% | +2.2% | −9.3% | +1.1% | +1.1% | +6.4% | +1.5% | +0.9% | −0.5% | +7.0% | −6.3% |
| 2023 | +9.1% | −1.7% | +1.5% | −1.4% | +1.8% | +7.9% | +2.2% | −2.1% | −5.8% | −5.9% | +12.4% | +8.1% |
| 2022 | −9.6% | −2.7% | +2.2% | −9.8% | −3.7% | −9.8% | +10.6% | −3.6% | −9.3% | +5.9% | +6.2% | −5.7% |
| 2021 | −2.5% | +5.8% | +1.5% | +4.4% | −0.9% | +2.2% | +2.1% | −0.8% | −2.7% | +5.7% | −5.1% | +5.0% |
| 2020 | +2.4% | −7.0% | −11.1% | +13.5% | +7.8% | +0.3% | +6.2% | +3.5% | −2.3% | −0.1% | +13.0% | +6.8% |
| 2019 | — | — | — | — | — | — | +1.8% | −0.8% | −0.2% | +1.0% | +3.6% | +1.2% |
BUIMX Risk
Risk measures from monthly returns over Jul 2023 – Jun 2026.
- 3-year volatility (annualised): 16.37%
- 3-year Sharpe ratio: 0.01 (vs 4.5% risk-free rate)
- Best month: +12.43% (Nov 2023)
- Worst month: −9.32% (Apr 2024)
BUIMX Fund Flows
Monthly money in and out of Buffalo Mid Cap Growth Fund, from SEC Form N-PORT.
- 12-month net flow: −$11.8M
- 12-month gross sales (incl. reinvestments): $18.8M
- Sales ÷ redemptions: 0.62×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| Jun 2026 | $493K | $3.9M | −$3.4M |
| May 2026 | $341K | $3.6M | −$3.3M |
| Apr 2026 | $693K | $1.8M | −$1.1M |
| Mar 2026 | $1.1M | $1.7M | −$554K |
| Feb 2026 | $329K | $2.5M | −$2.2M |
| Jan 2026 | $691K | $3.2M | −$2.5M |
| Dec 2025 | $13.3M | $2.9M | $10.4M |
| Nov 2025 | $297K | $3.5M | −$3.2M |
| Oct 2025 | $206K | $2.1M | −$1.9M |
| Sep 2025 | $293K | $1.6M | −$1.3M |
| Aug 2025 | $481K | $1.5M | −$1.0M |
| Jul 2025 | $629K | $2.4M | −$1.8M |
BUIMX Assets Under Management
Net assets of Buffalo Mid Cap Growth Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-06-30 | $113.32M |
| 2026-03-31 | $109.12M |
| 2025-12-31 | $125.53M |
| 2025-09-30 | $138.78M |
| 2025-06-30 | $144.65M |
| 2025-03-31 | $134.66M |
| 2024-12-31 | $144.26M |
| 2024-09-30 | $148.64M |
| 2024-06-30 | $141.80M |
| 2024-03-31 | $157.50M |
| 2023-12-31 | $150.90M |
| 2023-09-30 | $136.38M |
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.