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William Blair & Company Portfolio holdings
AUM
$38.4B
1-Year Est. Return
25.71%
This Fund
S&P 500
This Quarter
Est. Return
+7.16%
1 Year Est. Return
+25.71%
3 Year Est. Return
+88.7%
5 Year Est. Return
+104.53%
10 Year Est. Return
+665.86%
AUM
$37.6B
AUM Growth
+$1.57B
(+4.4%)
Cap. Flow
-$160M
Cap. Flow
% of AUM
-0.43%
Top 10 Holdings %
Top 10 Hldgs %
26.02%
Holding
1,919
New
98
Increased
697
Reduced
774
Closed
75
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Meta Platforms (Facebook)
META
|
+$76.1M |
| 2 |
Applovin
APP
|
+$75.3M |
| 3 |
ServiceNow
NOW
|
+$66.6M |
| 4 |
CWAN
Clearwater Analytics
CWAN
|
+$65.8M |
| 5 |
Diamondback Energy
FANG
|
+$30.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
CYBR
CyberArk
CYBR
|
+$70.7M |
| 2 |
Adobe
ADBE
|
+$61.7M |
| 3 |
Microsoft
MSFT
|
+$45.7M |
| 4 |
Workday
WDAY
|
+$42.6M |
| 5 |
Pool Corp
POOL
|
+$41.7M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 27.36% |
| 2 | Financials | 13.36% |
| 3 | Industrials | 12.59% |
| 4 | Healthcare | 10.97% |
| 5 | Consumer Discretionary | 7.45% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
976
Goldman Sachs Access Treasury 0-1 Year ETF
GBIL
$7.59B
| $797K | ﹤0.01% |
7,949
-150
| -2% | -$15K |
|
977
nVent Electric
NVT
$27.5B
| $795K | ﹤0.01% |
8,057
+3,117
| +63% | +$271K |
|
978
AerCap
AER
$23.5B
| $791K | ﹤0.01% |
6,537
+203
| +3% | +$23.7K |
|
979
iShares Core MSCI Europe ETF
IEUR
$9.15B
| $789K | ﹤0.01% |
11,584
| – | – |
|
980
Loews
L
$23B
| $784K | ﹤0.01% |
7,808
+7
| +0.1% | +$662 |
|
981
Equity Residential
EQR
$24.7B
| $772K | ﹤0.01% |
11,922
+49
| +0.4% | +$3.2K |
|
|
TWFG
982
TWFG Inc
TWFG
$1.46B
| $771K | ﹤0.01% |
28,082
-405
| -1% | -$11.7K |
|
983
Skyward Specialty Insurance
SKWD
$2.39B
| $770K | ﹤0.01% |
16,187
-4,938
| -23% | -$247K |
|
984
DT Midstream
DTM
$13.8B
| $769K | ﹤0.01% |
6,806
+238
| +4% | +$24.9K |
|
985
Blue Owl Capital
OBDC
$5.87B
| $768K | ﹤0.01% |
60,141
+8,467
| +16% | +$121K |
|
986
Wayfair
W
$13.9B
| $767K | ﹤0.01% |
8,590
-504
| -6% | -$36.9K |
|
|
VIA
987
Via Transportation Inc
VIA
$2.15B
| $764K | ﹤0.01% |
+15,900
| New | +$787K |
|
988
iPath Select MLP ETN
ATMP
$640M
| $763K | ﹤0.01% |
26,487
| – | – |
|
989
Invesco S&P SmallCap Energy ETF
PSCE
$104M
| $761K | ﹤0.01% |
17,850
-1,641
| -8% | -$66.8K |
|
990
Dime Commercial Bancshares
DCOM
$1.82B
| $756K | ﹤0.01% |
25,328
+4
| +0% | +$117 |
|
991
MediaAlpha
MAX
$813M
| $753K | ﹤0.01% |
66,197
+2,190
| +3% | +$24.2K |
|
992
Comfort Systems
FIX
$60.8B
| $747K | ﹤0.01% |
906
-394
| -30% | -$267K |
|
993
Hannon Armstrong Sustainable Infrastructure Capital
HASI
$5.44B
| $744K | ﹤0.01% |
24,232
+10,003
| +70% | +$276K |
|
994
Lennar Class B
LEN.B
$20.7B
| $742K | ﹤0.01% |
6,187
+19
| +0.3% | +$2.25K |
|
995
HSBC
HSBC
$358B
| $740K | ﹤0.01% |
10,432
-433
| -4% | -$28.2K |
|
996
Zscaler
ZS
$30.4B
| $739K | ﹤0.01% |
+2,465
| New | +$703K |
|
997
Ubiquiti
UI
$35.3B
| $738K | ﹤0.01% |
1,117
+375
| +51% | +$187K |
|
|
K
998
DELISTED
Kellanova
K
| $735K | ﹤0.01% |
8,961
-1,647
| -16% | -$131K |
|
999
W.R. Berkley
WRB
$26.2B
| $728K | ﹤0.01% |
9,495
+86
| +0.9% | +$6.12K |
|
1000
Huntington Ingalls Industries
HII
$12.8B
| $726K | ﹤0.01% |
2,523
+1,155
| +84% | +$308K |
|
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William Blair & Company's Q3 2025 Portfolio in Review
As of Q3 2025, William Blair & Company held 1,919 positions worth $37.6B, up 4.4% from $36B the previous quarter. Its ten largest holdings account for 26% of the portfolio.
William Blair & Company's Q3 2025 filing shows 98 new, 697 increased, 774 reduced and 75 closed positions. Its largest new stake was Miami International Holdings: 363,765 shares worth $14.6M. The largest sale was CyberArk, an estimated $70.7M.
By sector, the portfolio is most concentrated in Technology at 27% of assets, down from 27% a quarter earlier, followed by Financials and Industrials.
- William Blair & Company's largest Q3 2025 buy was Miami International Holdings: 363,765 shares worth $14.6M.
- William Blair & Company added most to Meta Platforms (Facebook) in Q3 2025, an estimated $76.1M increase.
- William Blair & Company's biggest Q3 2025 reduction was CyberArk, cutting an estimated $70.7M.
- William Blair & Company fully exited Stride in Q3 2025, selling an estimated $7.47M.
- William Blair & Company's ten largest holdings make up 26% of its $37.6B portfolio in Q3 2025.
- William Blair & Company opened 98 new positions and closed 75 in Q3 2025.
- William Blair & Company's portfolio value rose 4.4% quarter-over-quarter to $37.6B.
Based on William Blair & Company's 13F filing for Q3 2025, filed 12 Nov 2025.