Investment adviser · CRD 1252
WILLIAM BLAIR & COMPANY L.L.C.
Investment adviser filing (IA)
CHICAGO, IL, United States · Form ADV filed Mar 31, 2026
- Regulatory AUM
- $64.3B Form ADV · Item 5.F
- Client accounts
- 39,781 Accounts, not individual clients
- Employees
- 492 Reported in this filing
- Advisory professionals
- 231 Investment advisory functions
Who they report serving
Form ADV · Item 5.DClient types and their share of reported regulatory assets.
| Client type | Clients | Regulatory assets | Share of AUM |
|---|---|---|---|
| High-net-worth individuals | 9,054 | $45,350,562,302 | 70.5% |
| Corporations & businesses | 1,333 | $8,057,203,170 | 12.5% |
| Individuals | 26,242 | $7,326,873,678 | 11.4% |
| Charities | 31 | $1,771,479,072 | 2.8% |
| Other investment advisers | 1,146 | $1,393,987,774 | 2.2% |
| Retirement plans | 364 | $379,121,552 | 0.6% |
| Pooled investment vehicles | 1 | $5,616,826 | 0.0% |
Filing source
Form ADV 2051469 · Mar 31, 2026 · Item 5.D
Official IAPD profile (latest public filing). Values are the most recently reported in our imported data; the public profile may show a newer filing.
Private funds & service providers
46 Private fundsThe count excludes feeder funds. Funds in the latest filing appear first, ordered by reported gross assets. Earlier funds retain their last reported values.
WILLIAM BLAIR MB INVESTMENTS, L.P. - VMI 2021 SERIESPrivate Equity Fund · Last reported Mar 31, 2026$20.7MGross asset value
Form D fundraising filings
WILLIAM BLAIR MB INVESTENTS, L.P. -- VMI 2021 SERIES
Provider details
- Annual audit
- Yes
- Prime brokers
- No
- Custodians
- No
- Administrator other than the adviser
- Yes
- External marketing
- No
PRICEWATERHOUES COOPERS LLP
PCAOB 238
Fund details & source
- Fund ID
- 805-1142982280
- Reported beneficial owners
- 38
- Minimum commitment
- $100K
- Form D file number
- 021-410765
Form ADV 2051469 · Mar 31, 2026 · Schedule D 7.B.(1)
Official IAPD profile (latest public filing). Values are the most recently reported in our imported data; the public profile may show a newer filing.
WILLIAM BLAIR MB INVESTMENTS, L.P. - UGSI 2021 SERIESPrivate Equity Fund · Last reported Mar 31, 2026$14.2MGross asset value
Form D fundraising filings
WILLIAM BLAIR MB INVESTMENTS, L.P. -- UGSI 2021 SERIES
Provider details
- Annual audit
- Yes
- Prime brokers
- No
- Custodians
- No
- Administrator other than the adviser
- Yes
- External marketing
- No
PRICEWATERHOUES COOPERS LLP
PCAOB 238
Fund details & source
- Fund ID
- 805-9416078825
- Reported beneficial owners
- 14
- Minimum commitment
- $100K
- Form D file number
- 021-411813
Form ADV 2051469 · Mar 31, 2026 · Schedule D 7.B.(1)
Official IAPD profile (latest public filing). Values are the most recently reported in our imported data; the public profile may show a newer filing.
WILLIAM BLAIR MB INVESTMENTS, L.P. - FICI 2022 SERIESPrivate Equity Fund · Last reported Mar 31, 2026$9.7MGross asset value
Form D fundraising filings
WILLIAM BLAIR MB INVESTMENTS, L.P. -- FICI 2022 SERIES
Provider details
- Annual audit
- Yes
- Prime brokers
- No
- Custodians
- No
- Administrator other than the adviser
- Yes
- External marketing
- No
PRICEWATERHOUES COOPERS LLP
PCAOB 238
Fund details & source
- Fund ID
- 805-5008128384
- Reported beneficial owners
- 35
- Minimum commitment
- $100K
- Form D file number
- 021-434518
Form ADV 2051469 · Mar 31, 2026 · Schedule D 7.B.(1)
Official IAPD profile (latest public filing). Values are the most recently reported in our imported data; the public profile may show a newer filing.
WILLIAM BLAIR MB INVESTMENTS, L.P. - HII 2021 SERIESPrivate Equity Fund · Last reported Mar 31, 2026$8.9MGross asset value
Form D fundraising filings
WILLIAM BLAIR MB INVESTMENTS, L.P. -- HII 2021 SERIES
Provider details
- Annual audit
- Yes
- Prime brokers
- No
- Custodians
- No
- Administrator other than the adviser
- Yes
- External marketing
- No
PRICEWATERHOUES COOPERS LLP
PCAOB 238
Fund details & source
- Fund ID
- 805-7912648866
- Reported beneficial owners
- 16
- Minimum commitment
- $0
- Form D file number
- 021-389832
Form ADV 2051469 · Mar 31, 2026 · Schedule D 7.B.(1)
Official IAPD profile (latest public filing). Values are the most recently reported in our imported data; the public profile may show a newer filing.
WILLIAM BLAIR MB INVESTMENTS, LP - HC FII 2021 SERIESPrivate Equity Fund · Last reported Mar 31, 2026$7.55MGross asset value
Form D fundraising filings
WILLIAM BLAIR MB INVESTMENTS, L.P. -- HC FII 2021 SERIES
Provider details
- Annual audit
- Yes
- Prime brokers
- No
- Custodians
- No
- Administrator other than the adviser
- Yes
- External marketing
- No
PRICEWATERHOUES COOPERS LLP
PCAOB 238
Fund details & source
- Fund ID
- 805-1574281673
- Reported beneficial owners
- 20
- Minimum commitment
- $100K
- Form D file number
- 021-423956
Form ADV 2051469 · Mar 31, 2026 · Schedule D 7.B.(1)
Official IAPD profile (latest public filing). Values are the most recently reported in our imported data; the public profile may show a newer filing.
WILLIAM BLAIR MB INVESTMENTS, L.P. - PCTI 2022 SERIESPrivate Equity Fund · Last reported Mar 31, 2026$6.75MGross asset value
Form D fundraising filings
WILLIAM BLAIR MB INVESTMENTS, L.P. -- PCTI 2022 SERIES
Provider details
- Annual audit
- Yes
- Prime brokers
- No
- Custodians
- No
- Administrator other than the adviser
- Yes
- External marketing
- No
PRICEWATERHOUES COOPERS LLP
PCAOB 238
Fund details & source
- Fund ID
- 805-4461382805
- Reported beneficial owners
- 15
- Minimum commitment
- $100K
- Form D file number
- 021-434899
Form ADV 2051469 · Mar 31, 2026 · Schedule D 7.B.(1)
Official IAPD profile (latest public filing). Values are the most recently reported in our imported data; the public profile may show a newer filing.
WILLIAM BLAIR MB INVESTMENTS, L.P. - MOG FIII 2021 SERIESPrivate Equity Fund · Last reported Mar 31, 2026$6.4MGross asset value
Form D fundraising filings
WILLIAM BLAIR MB INVESTMENTS, L.P. -- MOG FIII 2021 SERIES
Provider details
- Annual audit
- Yes
- Prime brokers
- No
- Custodians
- No
- Administrator other than the adviser
- Yes
- External marketing
- No
PRICEWATERHOUES COOPERS LLP
PCAOB 238
Fund details & source
- Fund ID
- 805-1272428085
- Reported beneficial owners
- 13
- Minimum commitment
- $250K
- Form D file number
- 021-415949
Form ADV 2051469 · Mar 31, 2026 · Schedule D 7.B.(1)
Official IAPD profile (latest public filing). Values are the most recently reported in our imported data; the public profile may show a newer filing.
Services & filing details
Most recent filing: Mar 31, 2026. View historical filings
Reported services
Financial planning · Individual portfolio management · Pooled investment vehicle management · Business portfolio management · Selection of other advisers
Compensation
Percentage of assets · Fixed
Principal office
150 NORTH RIVERSIDE PLAZACHICAGO, IL, 60606, United States
CRD 1252
Filing source
Form ADV 2051469 · Mar 31, 2026 · Items 1 & 5
Official IAPD profile (latest public filing). Values are the most recently reported in our imported data; the public profile may show a newer filing.