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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 | |
|---|---|---|---|---|---|---|
926
Cognex
CGNX
$10.4B
| $983K | ﹤0.01% |
21,691
-11,950
| -36% | -$483K |
|
927
Wells Fargo 7.5% Non Cumv Perp Conv
WFC.PRL
$4.66B
| $969K | ﹤0.01% |
785
-15
| -2% | -$18.2K |
|
928
Schwab Emerging Markets Equity ETF
SCHE
$12.9B
| $968K | ﹤0.01% |
28,994
+275
| +1% | +$8.66K |
|
929
Similarweb
SMWB
$789M
| $954K | ﹤0.01% |
102,623
-5,460
| -5% | -$48.9K |
|
930
AutoNation
AN
$6.89B
| $954K | ﹤0.01% |
4,359
+34
| +0.8% | +$7.17K |
|
931
Integer Holdings
ITGR
$4.25B
| $953K | ﹤0.01% |
9,226
+342
| +4% | +$37.2K |
|
932
iShares Expanded Tech-Software Sector ETF
IGV
$15.2B
| $952K | ﹤0.01% |
8,277
+706
| +9% | +$78.1K |
|
933
iShares ESG MSCI USA Leaders ETF
SUSL
$1.22B
| $951K | ﹤0.01% |
8,124
-11
| -0.1% | -$1.24K |
|
934
Pinterest
PINS
$13.2B
| $939K | ﹤0.01% |
+29,193
| New | +$1.06M |
|
935
Entegris
ENTG
$25B
| $936K | ﹤0.01% |
10,121
+187
| +2% | +$15.9K |
|
936
Carpenter Technology
CRS
$26.6B
| $935K | ﹤0.01% |
3,808
-142
| -4% | -$36.3K |
|
937
Natera
NTRA
$44.8B
| $920K | ﹤0.01% |
5,716
+2,999
| +110% | +$474K |
|
938
iShares S&P Small-Cap 600 Value ETF
IJS
$8.43B
| $918K | ﹤0.01% |
8,299
-137
| -2% | -$14.5K |
|
939
Vanguard Short-Term Tax-Exempt Bond ETF
VTES
$2.23B
| $913K | ﹤0.01% |
8,959
-2,055
| -19% | -$209K |
|
940
VanEck Agribusiness ETF
MOO
$972M
| $904K | ﹤0.01% |
12,303
+4,130
| +51% | +$306K |
|
941
Seagate
STX
$209B
| $897K | ﹤0.01% |
3,798
+12
| +0.3% | +$2.05K |
|
942
State Street SPDR S&P Semiconductor ETF
XSD
$2.88B
| $891K | ﹤0.01% |
2,793
| – | – |
|
943
Blue Owl Capital
OWL
$19.7B
| $888K | ﹤0.01% |
52,469
-4,178
| -7% | -$79.5K |
|
944
GoDaddy
GDDY
$12.7B
| $888K | ﹤0.01% |
6,490
-312
| -5% | -$48K |
|
945
Xtrackers MSCI EAFE Hedged Equity ETF
DBEF
$9.46B
| $881K | ﹤0.01% |
18,972
| – | – |
|
946
Essential Utilities
WTRG
$11.5B
| $880K | ﹤0.01% |
22,065
-1,946
| -8% | -$74.2K |
|
947
Innovator US Equity Buffer ETF February
BFEB
$259M
| $880K | ﹤0.01% |
18,621
| – | – |
|
948
Dollar Tree
DLTR
$24.9B
| $879K | ﹤0.01% |
9,318
+215
| +2% | +$23K |
|
949
Old National Bancorp
ONB
$10.4B
| $878K | ﹤0.01% |
40,014
-457
| -1% | -$10.1K |
|
950
Cooper Companies
COO
$14.9B
| $874K | ﹤0.01% |
12,755
-8,990
| -41% | -$637K |
|
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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.