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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
+1.73%
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
$37.3B
AUM Growth
-$310M
Cap. Flow
-$212M
Cap. Flow %
-0.57%
Top 10 Hldgs %
27.41%
Holding
1,963
New
120
Increased
759
Reduced
753
Closed
96

Top Buys

Rank Stock Value
1
BWXT icon
BWX Technologies
BWXT
+$46.6M
2
META icon
Meta Platforms (Facebook)
META
+$38.3M
3
NOW icon
ServiceNow
NOW
+$37.6M
4
VEU icon
Vanguard FTSE All-World ex-US ETF
VEU
+$32.4M
5
GLD icon
SPDR Gold Trust
GLD
+$29.4M

Top Sells

Rank Stock Value
1
FISV
Fiserv Inc
FISV
+$114M
2
CSGP icon
CoStar Group
CSGP
+$78.3M
3
CWAN
Clearwater Analytics
CWAN
+$75.3M
4
POOL icon
Pool Corp
POOL
+$54M
5
ZTS icon
Zoetis
ZTS
+$51.3M

Sector Composition

Rank Sector Weight
1 Technology 25.8%
2 Financials 13.4%
3 Industrials 12.04%
4 Healthcare 11.22%
5 Communication Services 7.63%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
MAIN icon
701
Main Street Capital
MAIN
$5.54B
$2.34M 0.01%
38,796
-2,276
-6% -$134K
EPI icon
702
WisdomTree India Earnings Fund ETF
EPI
$2.05B
$2.32M 0.01%
50,209
-11,553
-19% -$529K
AMTM
703
Amentum Holdings
AMTM
$5.62B
$2.32M 0.01%
79,965
+29,316
+58% +$749K
DOW icon
704
Dow Inc
DOW
$22.6B
$2.32M 0.01%
99,100
-11,033
-10% -$254K
FLR icon
705
Fluor
FLR
$7.07B
$2.31M 0.01%
58,323
+13,226
+29% +$585K
OPCH icon
706
Option Care Health
OPCH
$3.67B
$2.29M 0.01%
72,022
+7
+0% +$205
TLN
707
Talen Energy Corp
TLN
$17.1B
$2.29M 0.01%
6,103
+1,949
+47% +$758K
UAL icon
708
United Airlines
UAL
$40.9B
$2.29M 0.01%
20,458
+917
+5% +$92.7K
EA
709
DELISTED
Electronic Arts
EA
$2.29M 0.01%
11,194
-1,018
-8% -$205K
HYMB icon
710
State Street SPDR Nuveen ICE High Yield Municipal Bond ETF
HYMB
$3.36B
$2.28M 0.01%
91,277
-618
-0.7% -$15.5K
PLD icon
711
Prologis
PLD
$132B
$2.27M 0.01%
17,815
-2,776
-13% -$346K
THR
712
DELISTED
Thermon Group Holdings
THR
$2.27M 0.01%
61,065
+963
+2% +$31.6K
LEN icon
713
Lennar Class A
LEN
$20.9B
$2.27M 0.01%
22,050
+288
+1% +$34.8K
SLB icon
714
SLB Ltd
SLB
$79.3B
$2.27M 0.01%
59,047
+4,512
+8% +$164K
DHS icon
715
WisdomTree US High Dividend Fund
DHS
$1.58B
$2.23M 0.01%
21,945
-200
-0.9% -$20.2K
GM icon
716
General Motors
GM
$78.3B
$2.22M 0.01%
27,339
-1,487
-5% -$105K
ASTS icon
717
AST SpaceMobile
ASTS
$20.8B
$2.22M 0.01%
30,586
-262
-0.8% -$18.7K
WAT icon
718
Waters Corp
WAT
$40.4B
$2.21M 0.01%
5,825
-178
-3% -$65.5K
FRPT icon
719
Freshpet
FRPT
$3.4B
$2.19M 0.01%
35,920
+1,782
+5% +$101K
NEM icon
720
Newmont
NEM
$124B
$2.18M 0.01%
21,883
-4,178
-16% -$377K
KJUL icon
721
Innovator US Small Cap Power Buffer ETF July
KJUL
$226M
$2.18M 0.01%
68,837
-2,340
-3% -$73.2K
ZNOV
722
Innovator Equity Defined Protection ETF - 1 Yr November
ZNOV
$105M
$2.18M 0.01%
81,675
-4,000
-5% -$106K
PRIM icon
723
Primoris Services
PRIM
$4.44B
$2.17M 0.01%
17,489
+3,850
+28% +$503K
LSTR icon
724
Landstar System
LSTR
$5.97B
$2.17M 0.01%
15,083
-4
-0% -$533
NTAP icon
725
NetApp
NTAP
$39.3B
$2.17M 0.01%
20,227
-491
-2% -$56.1K
27 28
29
30 31

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William Blair & Company's Q4 2025 Portfolio in Review

As of Q4 2025, William Blair & Company held 1,963 positions worth $37.3B, down 0.82% from $37.6B the previous quarter. Its ten largest holdings account for 27% of the portfolio.

William Blair & Company's Q4 2025 filing shows 120 new, 759 increased, 753 reduced and 96 closed positions. Its largest new stake was Wingstop: 90,773 shares worth $21.6M. The largest sale was Fiserv Inc, an estimated $114M.

By sector, the portfolio is most concentrated in Technology at 26% of assets, down from 27% a quarter earlier, followed by Financials and Industrials.

  • William Blair & Company's largest Q4 2025 buy was Wingstop: 90,773 shares worth $21.6M.
  • William Blair & Company added most to BWX Technologies in Q4 2025, an estimated $46.6M increase.
  • William Blair & Company's biggest Q4 2025 reduction was Fiserv Inc, cutting an estimated $114M.
  • William Blair & Company fully exited SAP in Q4 2025, selling an estimated $9.19M.
  • William Blair & Company's ten largest holdings make up 27% of its $37.3B portfolio in Q4 2025.
  • William Blair & Company opened 120 new positions and closed 96 in Q4 2025.
  • William Blair & Company's portfolio value fell 0.82% quarter-over-quarter to $37.3B.

Based on William Blair & Company's 13F filing for Q4 2025, filed 17 Feb 2026.