William Blair Investment Management
Asset Manager SEC-registered adviser
Legal name: William Blair Investment Management, LLC
AUM
$65.6B
Regulatory AUM
Private funds
9
Other 9
Private fund assets
$464.4M
Gross asset value
Employees
388
Last Form D raise
Feb 2026
Most recent fund filing
From SEC Form ADV filing (filed Apr 9, 2026). View on SEC
People(9)
Owners and executive officers named on the firm's SEC Form ADV.
B
B
C
M
M
R
R
S
S
Funds(9)
Private funds reported on Form ADV, with amounts raised from the funds' SEC Form D filings.
| Fund | Type | Gross assets | Raised (Form D) | Investors | Last Form D | Recency |
|---|---|---|---|---|---|---|
| William Blair Emerging Markets Growth Fund LLC | Other | $385.7M | $855.1M | 51 | Feb 2026 | Warm |
| William Blair International Leaders Fund LLC | Other | $71.4M | $472.1M | 12 | Feb 2026 | Warm |
| William Blair China A-Shares Growth Fund LP | Other | $4.2M | $138.1M | 42 | Feb 2026 | Warm |
| William Blair Global Leaders Equity Fund LLC | Other | $3.1M | $5.0M | 14 | Feb 2026 | Warm |
| William Blair International Leaders Concentrated Fund LLC | Other | — | $26.7M | 10 | Jun 2025 | Cool |
| William Blair Emerging Markets Ex China Growth Fund LLC | Other | — | $28.6M | 27 | Jun 2025 | Cool |
| William Blair Large Cap Core Fund LLC | Other | — | $8.6M | 19 | Feb 2025 | Cool |
| William Blair Emerging Markets Leaders Fund LLC | Other | — | $319.2M | 5 | Feb 2025 | Cool |
| William Blair Emerging Markets Leaders Concentrated Fund LLC | Other | — | $7.3M | 13 | Feb 2025 | Cool |
Board seats
Companies whose SEC Form D filings name one of this firm's people as a director, matched by name and office ZIP code.
No board seats matched from SEC filings yet.
Regulatory identifiers
- CRD number
- 173961
- SEC file number
- 801-80640
- CIK
- 1644956
Sources
- SEC Form ADV Oct 14, 2026