BIOIX Performance — Baron Opportunity Fund, Institutional Shares
Data updated: 2026-08-28
BIOIX returned +15.80% year to date and +27.76% over one year to Jun 2026. Annualised returns are +28.57% over 3 years and +10.99% over 5 years. The fund beat its US Large Growth category average: $100 invested three years ago grew to $213, against $175 for the category, and to $128 over one year, against $117. Volatility over the past three years was 19.49% a year. In the 12 months to Jun 2026 the fund took in a net $84.9M, and assets reached $2.12B.
BIOIX Growth of $100
What $100 invested in Baron Opportunity Fund grew to, compounded from monthly returns reported on SEC Form N-PORT, against the US Large Growth category average over the same months.
| Period | BIOIX | Category average |
|---|---|---|
| 1 year (Jul 2025 – Jun 2026) | $128 | $117 |
| 3 years (Jul 2023 – Jun 2026) | $213 | $175 |
| 5 years (Jul 2021 – Jun 2026) | $168 | $166 |
| Since data start (Jul 2019 – Jun 2026) | $386 | $271 |
BIOIX Trailing Returns
Total returns to Jun 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +15.80% |
| 1 year | +27.76% |
| 3 years (annualised) | +28.57% |
| 5 years (annualised) | +10.99% |
BIOIX Annual Returns
Calendar-year total returns of Baron Opportunity Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–Jun) | +15.80% |
| 2025 | +19.74% |
| 2024 | +40.24% |
| 2023 | +49.95% |
| 2022 | −42.84% |
| 2021 | +12.29% |
| 2020 | +89.29% |
| 2019 (Jul–Dec) | +9.05% |
BIOIX 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 | −3.3% | −1.7% | −4.1% | +10.6% | +8.7% | +5.7% | — | — | — | — | — | — |
| 2025 | +3.9% | −5.1% | −10.8% | +2.8% | +12.2% | +7.0% | +3.2% | −1.3% | +3.5% | +4.0% | −2.6% | +3.2% |
| 2024 | +2.7% | +10.2% | +1.9% | −6.8% | +3.5% | +8.2% | −1.1% | +0.9% | +4.3% | +1.1% | +8.9% | +1.7% |
| 2023 | +10.4% | 0.0% | +6.8% | −1.7% | +11.5% | +6.1% | +3.8% | −3.6% | −5.1% | −3.8% | +13.4% | +5.5% |
| 2022 | −15.4% | −3.0% | +2.3% | −16.6% | −5.8% | −7.1% | +11.2% | −2.1% | −10.3% | +3.1% | +1.4% | −8.7% |
| 2021 | +2.2% | +4.5% | −5.6% | +6.1% | −3.4% | +7.5% | −1.3% | +2.8% | −3.5% | +7.5% | −2.1% | −2.0% |
| 2020 | +6.3% | −1.7% | −10.7% | +14.8% | +10.5% | +10.2% | +7.0% | +11.2% | −0.9% | −0.4% | +13.0% | +9.3% |
| 2019 | — | — | — | — | — | — | +1.1% | −2.1% | −3.5% | +3.9% | +8.4% | +1.4% |
BIOIX Risk
Risk measures from monthly returns over Jul 2023 – Jun 2026.
- 3-year volatility (annualised): 19.49%
- 3-year Sharpe ratio: 1.24 (vs 4.5% risk-free rate)
- Best month: +13.40% (Nov 2023)
- Worst month: −10.78% (Mar 2025)
BIOIX Fund Flows
Monthly money in and out of Baron Opportunity Fund, from SEC Form N-PORT.
- 12-month net flow: $84.9M
- 12-month gross sales (incl. reinvestments): $717.8M
- Sales ÷ redemptions: 1.13×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| Jun 2026 | $75.9M | $43.9M | $31.9M |
| May 2026 | $41.9M | $22.6M | $19.3M |
| Apr 2026 | $61.8M | $54.3M | $7.5M |
| Mar 2026 | $56.6M | $62.1M | −$5.5M |
| Feb 2026 | $147.0M | $158.0M | −$11.1M |
| Jan 2026 | $38.8M | $42.4M | −$3.6M |
| Dec 2025 | $124.0M | $63.7M | $60.3M |
| Nov 2025 | $13.9M | $29.9M | −$16.0M |
| Oct 2025 | $40.4M | $55.1M | −$14.7M |
| Sep 2025 | $56.3M | $44.4M | $11.9M |
| Aug 2025 | $38.6M | $33.3M | $5.3M |
| Jul 2025 | $22.8M | $23.3M | −$469K |
BIOIX Assets Under Management
Net assets of Baron Opportunity Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-06-30 | $2.12B |
| 2026-03-31 | $1.62B |
| 2025-12-31 | $1.80B |
| 2025-09-30 | $1.76B |
| 2025-06-30 | $1.65B |
| 2025-03-31 | $1.35B |
| 2024-12-31 | $1.51B |
| 2024-09-30 | $1.36B |
| 2024-06-30 | $1.33B |
| 2024-03-31 | $1.30B |
| 2023-12-31 | $1.13B |
| 2023-09-30 | $996.02M |
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.