OBMCX — Oberweis Micro-Cap Fund
Data updated: 2026-08-28
OBMCX — Oberweis Micro-Cap Fund. United States Small Cap Growth Equity · $1.61B AUM · 1.46% expense ratio. Holdings, fees, performance and SEC filings.
OBMCX Fund Overview
OBMCX — Oberweis Micro-Cap Fund is a US mutual fund managed by Oberweis Funds, categorised as United States Small 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: Oberweis Funds
- Category: United States Small Cap Growth Equity
- Assets under management: $1.61B
- 1-year return: 78.1%
- Ticker: OBMCX
- SEC CIK: 0000803020
- SEC series ID: S000010231
- Share class ID: C000028300
OBMCX Holdings
Top 10 holdings of Oberweis Micro-Cap Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| Silicon Motion Technology Corp | 6.29% |
| Ultra Clean Holdings Inc | 5.49% |
| Applied Optoelectronics Inc | 4.85% |
| Powell Industries Inc | 3.07% |
| Diodes Inc | 2.71% |
| Rush Street Interactive Inc | 2.67% |
| Blue Bird Corp | 2.50% |
| Camtek Ltd/Israel | 2.47% |
| MaxLinear Inc | 2.45% |
| American Superconductor Corp | 2.38% |
OBMCX Portfolio Allocation
Asset-class allocation of Oberweis Micro-Cap Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Equity | 89.2% |
| Other | 6.3% |
OBMCX Performance
Total returns for OBMCX (as of 2026-09-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 55.8% |
| 1 year | 78.1% |
| 3 years (annualised) | 30.1% |
| 5 years (annualised) | 20.8% |
OBMCX Risk Information
Risk metrics for OBMCX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 24.6%
OBMCX Costs and Fees
OBMCX costs about $146 per $10,000 invested per year in fund expenses.
- Net expense ratio: 1.46%
- Gross expense ratio: 1.46%
- Portfolio turnover: 41%
- Brokerage commissions: 11.11 bps of average net assets (SEC N-CEN)
OBMCX Cashflows
Over the 12 months to 2026-06, Oberweis Micro-Cap Fund had net inflows of $272.89M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-06 | $71.39M |
| 2026-05 | $38.01M |
| 2026-04 | $45.83M |
| 2026-03 | $24.91M |
| 2026-02 | $18.15M |
| 2026-01 | $17.25M |
OBMCX Debt Constituents
No individual debt constituents are reported in Oberweis Micro-Cap Fund's latest SEC N-PORT filing.
OBMCX Prospectus and SEC Filings
Official Oberweis Micro-Cap Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
- Prospectus (485BPOS) — filed 2026-04-30
- Prospectus (485BPOS) — filed 2025-04-30
- Prospectus (485BPOS) — filed 2024-04-30
- Portfolio holdings (N-PORT) — filed 2026-08-28
- Portfolio holdings (N-PORT) — filed 2026-05-29
- Portfolio holdings (N-PORT) — filed 2026-02-27
- Annual census (N-CEN) — filed 2026-03-12
- Annual census (N-CEN) — filed 2025-03-11
Related Funds
Other United States Small 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.