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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 | |
|---|---|---|---|---|---|---|
1326
Global X MLP & Energy Infrastructure ETF
MLPX
$3.56B
| $280K | ﹤0.01% |
4,465
-340
| -7% | -$20.8K |
|
1327
Albertsons Companies
ACI
$6.02B
| $280K | ﹤0.01% |
15,987
+205
| +1% | +$4.02K |
|
1328
Schwab International Small-Cap Equity ETF
SCHC
$5.69B
| $280K | ﹤0.01% |
6,149
+1,056
| +21% | +$46.4K |
|
1329
Portland General Electric
POR
$5.92B
| $279K | ﹤0.01% |
6,334
-56
| -0.9% | -$2.35K |
|
1330
Healthpeak Properties
DOC
$14.3B
| $279K | ﹤0.01% |
14,547
+3,575
| +33% | +$64.1K |
|
1331
Amdocs
DOX
$6.23B
| $278K | ﹤0.01% |
3,393
+177
| +6% | +$15.3K |
|
1332
Jazz Pharmaceuticals
JAZZ
$16B
| $278K | ﹤0.01% |
2,107
+101
| +5% | +$12.1K |
|
1333
Fortis
FTS
$28.8B
| $276K | ﹤0.01% |
5,443
| – | – |
|
1334
NeoGenomics
NEO
$2.11B
| $276K | ﹤0.01% |
35,701
-1,502
| -4% | -$10.5K |
|
1335
Mercury Insurance
MCY
$5.81B
| $276K | ﹤0.01% |
3,251
| – | – |
|
1336
Liberty Broadband Class C
LBRDK
$5.29B
| $275K | ﹤0.01% |
4,328
+122
| +3% | +$8.53K |
|
1337
Toyota
TM
$223B
| $273K | ﹤0.01% |
1,430
+3
| +0.2% | +$565 |
|
1338
Universal Health Services
UHS
$10.1B
| $273K | ﹤0.01% |
1,335
+36
| +3% | +$6.48K |
|
1339
Kohl's
KSS
$2.22B
| $271K | ﹤0.01% |
17,617
-1,160
| -6% | -$15.5K |
|
1340
Bit Digital
BTBT
$520M
| $270K | ﹤0.01% |
90,000
| – | – |
|
1341
Autoliv
ALV
$8.89B
| $270K | ﹤0.01% |
2,182
-130
| -6% | -$15.6K |
|
1342
Canadian Imperial Bank of Commerce
CM
$112B
| $269K | ﹤0.01% |
3,369
-124
| -4% | -$9.33K |
|
1343
Middleby
MIDD
$5.29B
| $267K | ﹤0.01% |
2,012
-5
| -0.2% | -$694 |
|
1344
BHP
BHP
$222B
| $267K | ﹤0.01% |
4,789
-155
| -3% | -$8.25K |
|
1345
First Community Bankshares
FCBC
$933M
| $266K | ﹤0.01% |
7,654
| – | – |
|
1346
Repligen
RGEN
$9.45B
| $266K | ﹤0.01% |
1,992
-754
| -27% | -$91.6K |
|
|
ALMS
1347
Alumis Inc
ALMS
$3.11B
| $266K | ﹤0.01% |
66,719
| – | – |
|
1348
CNO Financial Group
CNO
$5.07B
| $262K | ﹤0.01% |
6,637
+13
| +0.2% | +$497 |
|
1349
ONE Gas
OGS
$5.09B
| $262K | ﹤0.01% |
3,243
+246
| +8% | +$18.4K |
|
|
NAUG
1350
Innovator Growth-100 Power Buffer ETF - August
NAUG
$57.6M
| $262K | ﹤0.01% |
9,054
+6,429
| +245% | +$182K |
|
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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.