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William Blair & Company

William Blair & Company Portfolio holdings

AUM $34.9B
1-Year Est. Return 18.88%
This Fund
S&P 500
This Quarter Est. Return
+1.73%
1 Year Est. Return
+18.88%
3 Year Est. Return
+73.84%
5 Year Est. Return
+90.13%
10 Year Est. Return
+563.35%
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
FLG
1051
Flagstar Bank National Association
FLG
$5.82B
$661K ﹤0.01%
52,541
+3,675
+8% +$43.9K
XT icon
1052
iShares Future Exponential Technologies ETF
XT
$3.99B
$659K ﹤0.01%
9,452
– –
LAMR icon
1053
Lamar Advertising Co
LAMR
$15.7B
$658K ﹤0.01%
5,195
-325
-6% -$40.7K
LII icon
1054
Lennox International
LII
$14.6B
$653K ﹤0.01%
1,344
-194
-13% -$97.2K
AIZ icon
1055
Assurant
AIZ
$14.2B
$649K ﹤0.01%
2,696
-530
-16% -$118K
JBHT icon
1056
JB Hunt Transport Services
JBHT
$25B
$649K ﹤0.01%
3,340
+149
+5% +$25.6K
BAC.PRL icon
1057
Bank of America Series L
BAC.PRL
$4B
$649K ﹤0.01%
518
+250
+93% +$315K
EMLP icon
1058
First Trust North American Energy Infrastructure Fund
EMLP
$4.1B
$641K ﹤0.01%
16,931
-102
-0.6% -$3.89K
ILCG icon
1059
iShares Morningstar Growth ETF
ILCG
$3.26B
$641K ﹤0.01%
6,157
+4
+0.1% +$418
SLF icon
1060
Sun Life Financial
SLF
$45.8B
$640K ﹤0.01%
10,263
-3,977
-28% -$240K
LINE
1061
Lineage Inc
LINE
$9.42B
$640K ﹤0.01%
18,282
+4,432
+32% +$164K
NBIX icon
1062
Neurocrine Biosciences
NBIX
$16.8B
$638K ﹤0.01%
4,500
+39
+0.9% +$5.65K
EIS icon
1063
iShares MSCI Israel ETF
EIS
$888M
$638K ﹤0.01%
+5,795
New +$605K
FIX icon
1064
Comfort Systems
FIX
$58.9B
$631K ﹤0.01%
677
-229
-25% -$211K
CTRA
1065
DELISTED
Coterra Energy
CTRA
$629K ﹤0.01%
23,906
-2,859
-11% -$72K
FTCS icon
1066
First Trust Capital Strength ETF
FTCS
$7.99B
$625K ﹤0.01%
6,756
+117
+2% +$10.8K
BOOT icon
1067
Boot Barn
BOOT
$5.11B
$624K ﹤0.01%
3,537
+493
+16% +$92K
PSA icon
1068
Public Storage
PSA
$60.8B
$623K ﹤0.01%
2,400
-6
-0.2% -$1.68K
CCL icon
1069
Carnival Corporation Ltd
CCL
$38B
$614K ﹤0.01%
20,102
-464
-2% -$12.9K
RBRK icon
1070
Rubrik
RBRK
$20.2B
$614K ﹤0.01%
+8,025
New +$616K
LB
1071
LandBridge Co
LB
$2.27B
$611K ﹤0.01%
12,475
+1,875
+18% +$109K
UI icon
1072
Ubiquiti
UI
$34.5B
$611K ﹤0.01%
1,104
-13
-1% -$8.22K
ALRM icon
1073
Alarm.com
ALRM
$2.77B
$610K ﹤0.01%
11,962
-800
-6% -$40.8K
LEN.B icon
1074
Lennar Class B
LEN.B
$20.2B
$608K ﹤0.01%
6,396
+209
+3% +$23.7K
COLD icon
1075
Americold
COLD
$4.17B
$606K ﹤0.01%
47,121
-4,440
-9% -$54.4K
41 42
43
44 45

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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.