BIOUX — Baron Opportunity Fund
Data updated: 2026-08-28
BIOUX — Baron Opportunity Fund. United States Large Cap Growth Information Technology Equity · $2.12B AUM. Holdings, fees, performance and SEC filings.
BIOUX Fund Overview
BIOUX — Baron Opportunity Fund is a US mutual fund managed by BARON INVESTMENT FUNDS TRUST (f/k/a BARON ASSET FUND), categorised as United States Large Cap Growth Information Technology Equity. ABC INVEST provides holdings, performance, costs, cashflows, risk data, prospectus documents and SEC filings, sourced from SEC filings.
- Type: US mutual fund
- Manager: BARON INVESTMENT FUNDS TRUST (f/k/a BARON ASSET FUND)
- Category: United States Large Cap Growth Information Technology Equity
- Assets under management: $2.12B
- 1-year return: 27.7%
- Ticker: BIOUX
- SEC CIK: 0000810902
- SEC series ID: S000000585
- Share class ID: C000174753
BIOUX Holdings
Top 10 holdings of Baron Opportunity Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| Space Exploration Technologies Corp | 19.02% |
| NVIDIA Corp | 11.49% |
| Broadcom Inc | 5.76% |
| Amazon.com Inc | 5.35% |
| Tesla Inc | 4.67% |
| Alphabet Inc | 4.36% |
| Eli Lilly & Co | 3.45% |
| Spotify Technology SA | 3.35% |
| Meta Platforms Inc | 2.81% |
| Taiwan Semiconductor Manufacturing Co Ltd | 2.75% |
BIOUX Portfolio Allocation
Asset-class allocation of Baron Opportunity Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Equity | 99.9% |
BIOUX Performance
Total returns for BIOUX (as of 2026-09-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 15.8% |
| 1 year | 27.7% |
| 3 years (annualised) | 28.6% |
| 5 years (annualised) | 11.0% |
BIOUX Risk Information
Risk metrics for BIOUX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 16.6%
BIOUX Costs and Fees
BIOUX costs about $104 per $10,000 invested per year in fund expenses.
- Net expense ratio: 1.04%
- Gross expense ratio: 1.04%
- Portfolio turnover: 30%
- Brokerage commissions: 1.63 bps of average net assets (SEC N-CEN)
BIOUX Cashflows
Over the 12 months to 2026-06, Baron Opportunity Fund had net inflows of $84.86M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-06 | $31.95M |
| 2026-05 | $19.30M |
| 2026-04 | $7.51M |
| 2026-03 | −$5.49M |
| 2026-02 | −$11.08M |
| 2026-01 | −$3.61M |
BIOUX Debt Constituents
No individual debt constituents are reported in Baron Opportunity Fund's latest SEC N-PORT filing.
BIOUX Prospectus and SEC Filings
Official Baron Opportunity Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
- Prospectus (485BPOS) — filed 2026-01-28
- Prospectus (485BPOS) — filed 2025-01-28
- Prospectus (485BPOS) — filed 2024-01-26
- Portfolio holdings (N-PORT) — filed 2026-08-28
- Portfolio holdings (N-PORT) — filed 2026-05-22
- Portfolio holdings (N-PORT) — filed 2026-03-02
- Annual census (N-CEN) — filed 2025-12-11
- Annual census (N-CEN) — filed 2024-12-06
Related Funds
Other United States Large Cap Growth Information Technology 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.