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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 | |
|---|---|---|---|---|---|---|
676
iShares ESG Optimized MSCI USA ETF
SUSA
$4.2B
| $2.52M | 0.01% |
18,584
-1,958
| -10% | -$256K |
|
677
Conagra Brands
CAG
$7.35B
| $2.49M | 0.01% |
136,235
+633
| +0.5% | +$12.1K |
|
678
Duolingo
DUOL
$6.44B
| $2.47M | 0.01% |
7,681
+6,557
| +583% | +$2.19M |
|
679
Wintrust Financial
WTFC
$11B
| $2.46M | 0.01% |
18,610
-145
| -0.8% | -$19.1K |
|
|
EA
680
DELISTED
Electronic Arts
EA
| $2.46M | 0.01% |
12,212
+90
| +0.7% | +$14.9K |
|
681
Neurogene
NGNE
$727M
| $2.46M | 0.01% |
141,820
+8,584
| +6% | +$172K |
|
682
NetApp
NTAP
$40.1B
| $2.45M | 0.01% |
20,718
+683
| +3% | +$76.4K |
|
683
Harte-Hanks
HHS
$20.8M
| $2.45M | 0.01% |
660,845
| – | – |
|
684
Vanguard Intermediate-Term Treasury ETF
VGIT
$42.5B
| $2.45M | 0.01% |
40,743
+2,909
| +8% | +$174K |
|
685
State Street SPDR Bloomberg 1-3 Month T-Bill ETF
BIL
$46.7B
| $2.45M | 0.01% |
26,653
-5,821
| -18% | -$533K |
|
686
Neogen
NEOG
$2.54B
| $2.44M | 0.01% |
427,489
-87,114
| -17% | -$465K |
|
687
Willis Towers Watson
WTW
$30.9B
| $2.4M | 0.01% |
6,941
+373
| +6% | +$121K |
|
688
Brookfield Infrastructure Partners
BIP
$18.2B
| $2.39M | 0.01% |
72,692
+779
| +1% | +$24.5K |
|
689
iShares 0-1 Year Treasury Bond ETF
SHV
$20.6B
| $2.39M | 0.01% |
21,630
+3,709
| +21% | +$409K |
|
690
First Advantage
FA
$3.78B
| $2.38M | 0.01% |
154,949
-4,119
| -3% | -$68.3K |
|
691
Trade Desk
TTD
$6.55B
| $2.36M | 0.01% |
48,254
+15,720
| +48% | +$997K |
|
692
Prologis
PLD
$134B
| $2.36M | 0.01% |
20,591
-440
| -2% | -$48.4K |
|
693
Exelon
EXC
$46.9B
| $2.33M | 0.01% |
51,701
+3,473
| +7% | +$153K |
|
694
Kenvue
KVUE
$36.8B
| $2.31M | 0.01% |
142,477
-63,910
| -31% | -$1.3M |
|
695
Western Digital
WDC
$169B
| $2.3M | 0.01% |
19,137
-265
| -1% | -$21.7K |
|
696
State Street SPDR Nuveen ICE High Yield Municipal Bond ETF
HYMB
$3.37B
| $2.29M | 0.01% |
91,895
-2,050
| -2% | -$50.2K |
|
697
Eversource Energy
ES
$27.2B
| $2.28M | 0.01% |
32,044
+253
| +0.8% | +$16.6K |
|
698
Gladstone Investment Corp
GAIN
$658M
| $2.28M | 0.01% |
164,914
-4,657
| -3% | -$65.6K |
|
699
Zimmer Biomet
ZBH
$18.8B
| $2.27M | 0.01% |
23,071
-760
| -3% | -$75.3K |
|
700
PACCAR
PCAR
$68.7B
| $2.27M | 0.01% |
23,049
-470
| -2% | -$46.4K |
|
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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.