Oberweis Small-Cap Opportunities Fund
Actively managed U.S. stock fund
As of its 2026 Q2 report, Oberweis Small-Cap Opportunities Fund held 78 positions with $2.84B in net assets. Its ten largest holdings made up 34.0% of the fund. The OBSOX share class costs 1.25% a year. Over the 12 months to May 2026, OBSOX returned 58.2%, with dividends reinvested. In 2026 Q2 it added 10 new positions and exited 9.
The Oberweis Small -Cap Opportunities Funds investment objective is to maximize capital appreciation.
The fund invests at least 80% of assets in small-cap stocks with market capitalizations in the Russell 2000 Growth Index range, selecting companies that the adviser believes exhibit above-average long-term growth potential based on fundamental analysis of financial statements, valuation relative to estimated future earnings, competitive positioning, and management quality. The adviser focuses on companies with underappreciated revenue or earnings growth, recent positive catalysts, business inflection points, limited analyst coverage, sustainable competitive advantages, and operating leverage. Because the fund's security selections depend on the adviser's forecasts and assessments, which may diverge from market consensus and analyst expectations, performance will vary with the accuracy of those judgments. The fund may trade actively and is not constrained to track an index.
What you own
| Company | Weight | Value | Shares | Reported price |
|---|---|---|---|---|
8.20% | $232.99M | 856.7K | $271.95 | |
5.59% | $158.70M | 1.1M | $148.16 | |
4.26% | $120.96M | 770.3K | $157.03 | |
SITMSiTime Corp | 2.78% | $78.88M | 105.8K | $745.56 |
2.68% | $76.23M | 500.6K | $152.27 | |
2.52% | $71.61M | 1.0M | $69.74 | |
HNGEHinge Health Inc | 2.15% | $61.03M | 735.3K | $83.00 |
RMBSRambus Inc | 2.04% | $57.95M | 436.6K | $132.74 |
1.94% | $55.08M | 144.8K | $380.37 | |
NVMINova Ltd | 1.83% | $52.07M | 95.9K | $542.94 |
Reported price is the fund's own reported value divided by its own reported shares at 2026-06-30 — not a live quote, and not what the fund paid.
All 78 holdings, with the share counts as filed, open with a free account.
What the fund is made of
Percentages are of fund net assets. Rounding, liabilities and short positions can make totals differ from 100%.
| Stocks | 97.61% |
By sector
- Information Technology
- 42.0%
- Health Care
- 18.7%
- Industrials
- 17.6%
- Consumer Discretionary
- 8.1%
- 5 other sectors
- 13.5%
- Information Technology
- 42.0%
- Health Care
- 18.7%
- Industrials
- 17.6%
- Consumer Discretionary
- 8.1%
- Financials
- 5.4%
- Energy
- 3.8%
- International
- 2.5%
- Materials
- 1.1%
- Communication Services
- 0.6%
How it has done
OBSOX share class · total returns with dividends reinvested
Volatility over the last 12 months: 21.11%. Past returns are a record, not a forecast.
Jun 2026 has been filed since the trailing figures were struck, so it is not in the table above or the curve — every figure here shares one cut-off, which is what makes them comparable with other funds.
The 2 share classes hold the same portfolio
| Share class | Expense ratio | 1 year | 3 years | 5 years | Worst fall |
|---|---|---|---|---|---|
| 1.25% | +58.15% | +91.96% | +110.07% | -16.98% | |
| 1.00% | +58.55% | +93.45% | +112.70% | -16.96% |
These classes hold the same portfolio, so the 2.63pp spread over 5 years is the cost difference between them — roughly 0.53pp a year — not a difference in what they own.
Fees & fund details
Oberweis Small-Cap Opportunities Fund is an actively managed U.S. equity fund. 46% of OBSOX’s stock holdings are in companies whose revenue grew in the top quartile of U.S. companies over the last five fiscal years (covering 89% of the fund’s equity).
- Asset class
- Equity
- Region
- United States
- Management
- Actively managed
- Fund type
- Open-end fund
- Expense ratio, by class
- 1.00% – 1.25%· OBSOX 1.25%
- Portfolio turnover
- 58.00% a year · as of 2026 Q2
Net is what a holder pays after the adviser's contractual waiver; gross is before it. A waiver can expire.
Turnover is how much of the portfolio was replaced in a year.
Classified from what the fund holds, not from its name · 2026 Q2. The summary is a paraphrase of the prospectus; the objective is verbatim.
What changed this quarter
Positions that entered or left the fund since its previous filing. Positions that were only resized are not listed.
10 new· the largest 8
9 exited· the largest 8
Understand how this fund fits with the rest.
Explore shared holdings, compare funds and follow their businesses with your connected AI:
- “Where do my funds overlap — OBSOX, QQQ and the fund in my 401(k)?”
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