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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 | |
|---|---|---|---|---|---|---|
1126
Baxter International
BAX
$14B
| $483K | ﹤0.01% |
21,231
-4,372
| -17% | -$111K |
|
|
THW
1127
abrdn World Healthcare Fund
THW
$560M
| $483K | ﹤0.01% |
38,300
| – | – |
|
1128
HUB Group
HUBG
$2.55B
| $482K | ﹤0.01% |
13,998
-725
| -5% | -$25.9K |
|
1129
Brookfield Renewable
BEP
$10.6B
| $481K | ﹤0.01% |
18,649
+8
| +0% | +$206 |
|
1130
Popular Inc
BPOP
$11.3B
| $476K | ﹤0.01% |
3,750
-1,000
| -21% | -$120K |
|
1131
Ituran Location and Control
ITRN
$1.06B
| $476K | ﹤0.01% |
13,334
+38
| +0.3% | +$1.44K |
|
1132
Vanguard Materials ETF
VAW
$3.05B
| $476K | ﹤0.01% |
2,322
-79
| -3% | -$16K |
|
1133
iShares US Consumer Staples ETF
IYK
$1.43B
| $474K | ﹤0.01% |
6,925
+334
| +5% | +$23.3K |
|
1134
Clean Harbors
CLH
$16.9B
| $472K | ﹤0.01% |
2,033
-139
| -6% | -$32.9K |
|
1135
Masco
MAS
$14.7B
| $472K | ﹤0.01% |
6,699
-1,510
| -18% | -$106K |
|
|
GRID
1136
First Trust NASDAQ Clean Edge Smart Grid Infrastructure Index Fund
GRID
$12.3B
| $470K | ﹤0.01% |
3,113
+44
| +1% | +$6.33K |
|
1137
Joby Aviation
JOBY
$8.17B
| $467K | ﹤0.01% |
28,949
+5,278
| +22% | +$80.2K |
|
1138
Korro Bio
KRRO
$196M
| $467K | ﹤0.01% |
+9,750
| New | +$216K |
|
1139
Invesco Large Cap Growth ETF
PWB
$2.45B
| $466K | ﹤0.01% |
3,713
| – | – |
|
1140
iShares US Treasury Bond ETF
GOVT
$43.8B
| $463K | ﹤0.01% |
20,021
-1,382
| -6% | -$31.7K |
|
1141
Rivian
RIVN
$22.9B
| $461K | ﹤0.01% |
31,434
-13,642
| -30% | -$183K |
|
|
MRP
1142
Millrose Properties Inc
MRP
$5.02B
| $461K | ﹤0.01% |
13,708
+294
| +2% | +$9.5K |
|
1143
H.B. Fuller
FUL
$3.24B
| $460K | ﹤0.01% |
7,765
+509
| +7% | +$30.6K |
|
|
FIG
1144
Figma
FIG
$14B
| $460K | ﹤0.01% |
+8,864
| New | +$609K |
|
1145
Madrigal Pharmaceuticals
MDGL
$11.7B
| $459K | ﹤0.01% |
1,000
| – | – |
|
1146
International Flavors & Fragrances
IFF
$21.4B
| $459K | ﹤0.01% |
7,451
-1,504
| -17% | -$103K |
|
1147
JPMorgan Municipal ETF
JMUB
$8.52B
| $457K | ﹤0.01% |
9,050
+50
| +0.6% | +$2.48K |
|
1148
FlexShares Morningstar Developed Markets ex-US Factor Tilt Index Fund
TLTD
$690M
| $452K | ﹤0.01% |
5,096
| – | – |
|
1149
Appian
APPN
$2.65B
| $452K | ﹤0.01% |
14,781
-100
| -0.7% | -$3K |
|
1150
Alamos Gold
AGI
$13.8B
| $449K | ﹤0.01% |
12,884
-1,174
| -8% | -$33.6K |
|
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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.