| Category | Fund Name | Class | Net Assets ($ M)* | 2025 | 2024 | 2023 |
|---|---|---|---|---|---|---|
| Mixed-Regions | William Blair Emerging Markets Leaders Fund + | Institutional Class Shares | 352 | -6.5 | 5.6 | 5.3 |
| Mixed-Regions | William Blair Emerging Markets Growth Fund + | Institutional Class Shares | 670 | -3.2 | 10.6 | 9.6 |
| Mixed-Regions | William Blair Emerging Markets Small Cap Growth Fund + | Institutional Class Shares | 323 | -12.6 | 8.4 | 22 |
| Large-Cap-Growth | William Blair International Leaders Fund + | Institutional Class Shares | 1000 | -1.3 | -1.1 | 12.6 |
| Small-Cap-Growth | William Blair International Small Cap Growth Fund + | Institutional Class Shares | 235 | 2.3 | -1 | 13.7 |
| Large-Cap-Growth | William Blair Global Leaders Fund + | Institutional Class Shares | 92 | 2.9 | -30 | 15.3 |
| Multi-Cap-Growth | William Blair Growth Fund + | Class I Shares | 189 | -15.5 | -1.5 | 25.8 |
| Large-Cap-Growth | William Blair Large Cap Growth Fund + | Class I Shares | 1070 | -2.5 | 19 | 40.5 |
| Large-Cap-Growth | William Blair Large Cap Growth Fund | Class N Shares | 1070 | -2.3 | 18.3 | 40.1 |
| Multi-Cap-Growth | William Blair Growth Fund | Class N Shares | 189 | -9.7 | -9.4 | 22 |
| Small-Cap-Growth | William Blair Small Cap Growth Fund + | Class I Shares | 530 | -15.3 | 8.3 | 14.6 |
| Small-Cap-Growth | William Blair Small Cap Growth Fund | Class N Shares | 530 | -15.5 | 5.9 | 14 |
| Mid-Cap-Growth | William Blair Mid Cap Growth Fund + | Class I Shares | 32 | 0 | 0 | 16.6 |
| Mid-Cap-Growth | William Blair Mid Cap Growth Fund | Class N Shares | 32 | 0 | 0 | 16.4 |
| Mid-Cap-Growth | William Blair Small-Mid Cap Growth Fund + | Class I Shares | 2.01 | -9.5 | -0.9 | 9.2 |
| Mid-Cap-Growth | William Blair Small-Mid Cap Growth Fund | Class N Shares | 2.01 | -14.4 | -2.4 | 8.2 |
| Mixed-Regions | William Blair Emerging Markets Leaders Fund | Class I Shares | 352 | 3 | 5.6 | 5.3 |
| Mixed-Regions | William Blair Emerging Markets Leaders Fund | Class N Shares | 352 | 2.6 | 5.6 | 5.2 |
| Mixed-Regions | William Blair Emerging Markets Growth Fund | Class I Shares | 670 | -2.7 | 10.5 | 9.6 |
| Mixed-Regions | William Blair Emerging Markets Growth Fund | Class N Shares | 670 | -0.6 | 10.4 | 9.7 |
| Mixed-Regions | William Blair Emerging Markets Small Cap Growth Fund | Class I Shares | 323 | -10.2 | 8.4 | 21.9 |
| Mixed-Regions | William Blair Emerging Markets Small Cap Growth Fund | Class N Shares | 323 | -8.6 | 8.1 | 21.9 |
| Large-Cap-Growth | William Blair International Leaders Fund | Class I Shares | 1000 | 3.7 | -1.1 | 12.6 |
| Large-Cap-Growth | William Blair International Leaders Fund | Class N Shares | 1000 | 3.8 | -1 | 12.6 |
| Multi-Cap-Growth | William Blair Institutional International Developed Plus Fund | NA | 0 | 0 | 0 | 0 |
| Multi-Cap-Growth | William Blair Institutional International Growth Fund | NA | 1770 | -4.4 | -4.7 | 12.3 |
| Multi-Cap-Growth | William Blair International Developed Plus Fund + | Class I Shares | 0 | 0 | 0 | 0 |
| Multi-Cap-Growth | William Blair International Developed Plus Fund | Class N Shares | 0 | 0 | 0 | 0 |
| Multi-Cap-Growth | William Blair International Growth Fund + | Class I Shares | 1430 | -2.5 | -4.7 | 11.4 |
| Multi-Cap-Growth | William Blair International Growth Fund | Class N Shares | 1430 | 2.8 | -5 | 11.3 |
| Small-Cap-Growth | William Blair International Small Cap Growth Fund | Class I Shares | 235 | 4.1 | -1 | 13.7 |
| Small-Cap-Growth | William Blair International Small Cap Growth Fund | Class N Shares | 235 | 2.8 | -1 | 13.7 |
| Large-Cap-Growth | William Blair Global Leaders Fund | Class I Shares | 92 | -6.7 | -30 | 15.2 |
| Large-Cap-Growth | William Blair Global Leaders Fund | Class N Shares | 92 | -1.1 | -30.4 | 14.9 |
* Net Assets include for all classes