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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
VOX icon
1301
Vanguard Communication Services ETF
VOX
$5.88B
$306K ﹤0.01%
1,578
+620
+65% +$116K
MXL icon
1302
MaxLinear
MXL
$6.21B
$304K ﹤0.01%
17,430
-398
-2% -$6.48K
SWK icon
1303
Stanley Black & Decker
SWK
$15.5B
$304K ﹤0.01%
4,088
-79
-2% -$5.56K
UHS icon
1304
Universal Health Services
UHS
$10.5B
$303K ﹤0.01%
1,390
+55
+4% +$12.2K
OPEN icon
1305
Opendoor
OPEN
$3.38B
$303K ﹤0.01%
51,923
-1,768
-3% -$12.7K
RXRX icon
1306
Recursion Pharmaceuticals
RXRX
$1.76B
$303K ﹤0.01%
74,000
-3,033
-4% -$15K
AGNC icon
1307
AGNC Investment
AGNC
$12.8B
$302K ﹤0.01%
28,203
+9,008
+47% +$92.6K
PNR icon
1308
Pentair
PNR
$10.7B
$302K ﹤0.01%
2,898
-1,529
-35% -$163K
CTRE icon
1309
CareTrust REIT
CTRE
$9.55B
$302K ﹤0.01%
8,345
+1
+0% +$36
MIDD icon
1310
Middleby
MIDD
$5.89B
$302K ﹤0.01%
2,029
+17
+0.8% +$2.23K
EZU icon
1311
iShare MSCI Eurozone ETF
EZU
$9.88B
$301K ﹤0.01%
4,695
-45
-0.9% -$2.82K
LYFT icon
1312
Lyft
LYFT
$6.55B
$301K ﹤0.01%
15,535
-624
-4% -$13K
DFAT icon
1313
Dimensional US Targeted Value ETF
DFAT
$14.7B
$300K ﹤0.01%
5,042
+52
+1% +$3.03K
JAZZ icon
1314
Jazz Pharmaceuticals
JAZZ
$16.7B
$297K ﹤0.01%
1,746
-361
-17% -$55.3K
SSB icon
1315
SouthState Bank Corp
SSB
$10.5B
$297K ﹤0.01%
3,152
-7
-0.2% -$648
IYZ icon
1316
iShares US Telecommunications ETF
IYZ
$1.22B
$296K ﹤0.01%
8,730
+723
+9% +$23.7K
PCT icon
1317
PureCycle Technologies
PCT
$1.46B
$296K ﹤0.01%
34,429
+17,958
+109% +$191K
VFC icon
1318
VF Corp
VFC
$5.86B
$294K ﹤0.01%
16,248
+465
+3% +$7.54K
FELE icon
1319
Franklin Electric
FELE
$4.75B
$293K ﹤0.01%
3,066
-38
-1% -$3.63K
HLT icon
1320
Hilton Worldwide
HLT
$70B
$293K ﹤0.01%
1,019
-1,141
-53% -$311K
FDN icon
1321
First Trust Dow Jones Internet Index Fund ETF
FDN
$5.41B
$292K ﹤0.01%
1,083
-19
-2% -$5.21K
ICVT icon
1322
iShares Convertible Bond ETF
ICVT
$7.42B
$291K ﹤0.01%
2,957
-89
-3% -$8.95K
EWBC icon
1323
East-West Bancorp
EWBC
$18.1B
$291K ﹤0.01%
2,589
-192
-7% -$20.4K
NWG icon
1324
NatWest
NWG
$76.3B
$290K ﹤0.01%
16,588
+250
+2% +$3.96K
R icon
1325
Ryder
R
$9.98B
$288K ﹤0.01%
1,504
-2,031
-57% -$365K
51 52
53
54 55

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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.