BUIMX — Buffalo Mid Cap Growth Fund
Data updated: 2026-08-21
BUIMX — Buffalo Mid Cap Growth Fund. United States Mid Cap Growth Equity · $113.32M AUM · 0.89% expense ratio. Holdings, fees, performance and SEC filings.
BUIMX Fund Overview
BUIMX — Buffalo Mid Cap Growth Fund is a US mutual fund managed by Buffalo Funds, categorised as United States Mid Cap Growth Equity. ABC INVEST provides holdings, performance, costs, cashflows, risk data, prospectus documents and SEC filings, sourced from SEC filings.
- Type: US mutual fund
- Manager: Buffalo Funds
- Category: United States Mid Cap Growth Equity
- Assets under management: $113.32M
- 1-year return: -5.1%
- Ticker: BUIMX
- SEC CIK: 0001135300
- SEC series ID: S000006556
- Share class ID: C000214588
BUIMX Holdings
Top 10 holdings of Buffalo Mid Cap Growth Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| MSCI Inc | 3.71% |
| Onto Innovation Inc | 3.34% |
| Vertiv Holdings Co | 3.25% |
| Comfort Systems USA Inc | 3.15% |
| Datadog Inc | 2.76% |
| Stevanato Group SpA | 2.63% |
| Teradyne Inc | 2.56% |
| California Water Service Group | 2.36% |
| James Hardie Industries PLC | 2.25% |
| Liberty Media Corp-Liberty For | 2.24% |
BUIMX Portfolio Allocation
Asset-class allocation of Buffalo Mid Cap Growth Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Equity | 99.5% |
| Cash & Equivalents | 0.5% |
BUIMX Performance
Total returns for BUIMX (as of 2026-09-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 1.2% |
| 1 year | -5.1% |
| 3 years (annualised) | 4.7% |
| 5 years (annualised) | 0.3% |
BUIMX Risk Information
Risk metrics for BUIMX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 11.1%
BUIMX Costs and Fees
BUIMX costs about $89 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.89%
- Gross expense ratio: 0.89%
- Portfolio turnover: 39%
- Brokerage commissions: 4.23 bps of average net assets (SEC N-CEN)
BUIMX Cashflows
Over the 12 months to 2026-06, Buffalo Mid Cap Growth Fund had net outflows of $11.79M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-06 | −$3.36M |
| 2026-05 | −$3.27M |
| 2026-04 | −$1.10M |
| 2026-03 | −$553.64K |
| 2026-02 | −$2.16M |
| 2026-01 | −$2.52M |
BUIMX Debt Constituents
No individual debt constituents are reported in Buffalo Mid Cap Growth Fund's latest SEC N-PORT filing.
BUIMX Prospectus and SEC Filings
Official Buffalo Mid Cap Growth Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
- Prospectus (485BPOS) — filed 2026-07-27
- Prospectus (485BPOS) — filed 2025-07-25
- Prospectus (485BPOS) — filed 2024-07-26
- Portfolio holdings (N-PORT) — filed 2026-08-21
- Portfolio holdings (N-PORT) — filed 2026-05-22
- Portfolio holdings (N-PORT) — filed 2026-02-24
- Annual census (N-CEN) — filed 2026-06-08
- Annual census (N-CEN) — filed 2025-06-09
Related Funds
Other United States Mid Cap Growth 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.