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William Blair & Company

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
Cap. Flow
-$160M
Cap. Flow %
-0.43%
Top 10 Hldgs %
26.02%
Holding
1,919
New
98
Increased
697
Reduced
774
Closed
75

Top Buys

Rank Stock Value
1
META icon
Meta Platforms (Facebook)
META
+$76.1M
2
APP icon
Applovin
APP
+$75.3M
3
NOW icon
ServiceNow
NOW
+$66.6M
4
CWAN
Clearwater Analytics
CWAN
+$65.8M
5
FANG icon
Diamondback Energy
FANG
+$30.7M

Top Sells

Rank Stock Value
1
CYBR
CyberArk
CYBR
+$70.7M
2
ADBE icon
Adobe
ADBE
+$61.7M
3
MSFT icon
Microsoft
MSFT
+$45.7M
4
WDAY icon
Workday
WDAY
+$42.6M
5
POOL icon
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
BOTZ icon
476
Global X Robotics & Artificial Intelligence ETF
BOTZ
$3.58B
$6.07M 0.02%
171,238
-3,510
-2% -$118K
AMP icon
477
Ameriprise Financial
AMP
$49.7B
$6.05M 0.02%
12,325
-181
-1% -$92.8K
SCHX icon
478
Schwab US Large- Cap ETF
SCHX
$75B
$6.04M 0.02%
229,433
-892
-0.4% -$22.7K
GDYN icon
479
Grid Dynamics Holdings
GDYN
$642M
$6.01M 0.02%
779,204
-17,439
-2% -$156K
EEM icon
480
iShares MSCI Emerging Markets ETF
EEM
$30.5B
$6M 0.02%
112,355
+18,661
+20% +$937K
DD icon
481
DuPont de Nemours
DD
$19.4B
$5.97M 0.02%
61,012
-1,826
-3% -$172K
ENB icon
482
Enbridge
ENB
$112B
$5.84M 0.02%
115,703
-7,291
-6% -$343K
NOBL icon
483
ProShares S&P 500 Dividend Aristocrats ETF
NOBL
$12B
$5.84M 0.02%
113,266
-3,278
-3% -$170K
XLU icon
484
State Street Utilities Select Sector SPDR ETF
XLU
$22.9B
$5.84M 0.02%
133,836
-1,912
-1% -$80.9K
VCIT icon
485
Vanguard Intermediate-Term Corporate Bond ETF
VCIT
$67.9B
$5.83M 0.02%
69,266
-3,805
-5% -$317K
ETR icon
486
Entergy
ETR
$50.1B
$5.76M 0.02%
61,792
+38,751
+168% +$3.41M
LEU icon
487
Centrus Energy
LEU
$3.7B
$5.75M 0.02%
18,556
+10,153
+121% +$2.25M
FSS icon
488
Federal Signal
FSS
$7.68B
$5.75M 0.02%
48,343
+7,988
+20% +$959K
LHX icon
489
L3Harris
LHX
$54B
$5.75M 0.02%
18,835
+1,264
+7% +$346K
U icon
490
Unity
U
$19.8B
$5.73M 0.02%
143,084
-22,573
-14% -$837K
TEM
491
Tempus AI
TEM
$9.94B
$5.73M 0.02%
70,941
+3,304
+5% +$231K
WELL icon
492
Welltower
WELL
$169B
$5.66M 0.02%
31,778
+175
+0.6% +$28.8K
BDX icon
493
Becton Dickinson
BDX
$50.1B
$5.65M 0.02%
30,205
-4,831
-14% -$898K
DGRO icon
494
iShares Core Dividend Growth ETF
DGRO
$43.9B
$5.63M 0.02%
82,695
-994
-1% -$65.7K
NUE icon
495
Nucor
NUE
$61.8B
$5.57M 0.01%
41,127
-1,809
-4% -$256K
CSX icon
496
CSX Corp
CSX
$93.6B
$5.52M 0.01%
155,487
-6,790
-4% -$232K
AIR icon
497
AAR Corp
AIR
$5.89B
$5.47M 0.01%
61,034
+8,044
+15% +$612K
ITA icon
498
iShares US Aerospace & Defense ETF
ITA
$14.9B
$5.38M 0.01%
25,726
+3,129
+14% +$616K
WAY
499
Waystar Holding Corp
WAY
$4.76B
$5.38M 0.01%
141,873
+40,231
+40% +$1.49M
VIS icon
500
Vanguard Industrials ETF
VIS
$8.48B
$5.36M 0.01%
18,097
+73
+0.4% +$21.2K
18 19
20
21 22

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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.