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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
IGF icon
1451
iShares Global Infrastructure ETF
IGF
$10.6B
$207K ﹤0.01%
3,371
+264
+8% +$16.3K
FBNC icon
1452
First Bancorp
FBNC
$2.68B
$205K ﹤0.01%
4,042
– –
MRNA icon
1453
Moderna
MRNA
$23.9B
$205K ﹤0.01%
6,946
-888
-11% -$24.1K
FXI icon
1454
iShares China Large-Cap ETF
FXI
$4.35B
$205K ﹤0.01%
5,348
+1,234
+30% +$49K
NEAR icon
1455
iShares Short Maturity Bond ETF
NEAR
$4.88B
$204K ﹤0.01%
+3,997
New +$205K
INDB icon
1456
Independent Bank
INDB
$3.97B
$204K ﹤0.01%
2,793
-364
-12% -$25.9K
FTC icon
1457
First Trust Large Cap Growth AlphaDEX Fund
FTC
$1.38B
$204K ﹤0.01%
1,275
-300
-19% -$48K
MTH icon
1458
Meritage Homes
MTH
$4.69B
$204K ﹤0.01%
3,098
-1,688
-35% -$117K
ALT icon
1459
Altimmune
ALT
$593M
$204K ﹤0.01%
+56,434
New +$246K
BMRC icon
1460
Bank of Marin Bancorp
BMRC
$455M
$204K ﹤0.01%
+7,828
New +$201K
H icon
1461
Hyatt Hotels
H
$16B
$203K ﹤0.01%
+1,269
New +$194K
PLOW icon
1462
Douglas Dynamics
PLOW
$984M
$203K ﹤0.01%
+6,214
New +$197K
DY icon
1463
Dycom Industries
DY
$12B
$202K ﹤0.01%
+599
New +$189K
QUS icon
1464
State Street SPDR MSCI USA StrategicFactors ETF
QUS
$1.58B
$202K ﹤0.01%
1,157
– –
CBT icon
1465
Cabot Corp
CBT
$4.46B
$201K ﹤0.01%
3,038
+67
+2% +$4.46K
SCHK icon
1466
Schwab 1000 Index ETF
SCHK
$5.93B
$201K ﹤0.01%
6,124
– –
EUSA icon
1467
iShares MSCI USA Equal Weighted ETF
EUSA
$1.93B
$199K ﹤0.01%
1,925
-389
-17% -$40K
UPWK icon
1468
Upwork
UPWK
$1.21B
$199K ﹤0.01%
+10,030
New +$184K
BXMT icon
1469
Blackstone Mortgage Trust
BXMT
$2.39B
$199K ﹤0.01%
10,382
+7
+0.1% +$133
VG
1470
Venture Global Inc
VG
$35.4B
$198K ﹤0.01%
29,101
-59,323
-67% -$494K
LBRDK icon
1471
Liberty Broadband Class C
LBRDK
$5.18B
$198K ﹤0.01%
4,083
-245
-6% -$12.7K
VTRS icon
1472
Viatris
VTRS
$18.7B
$194K ﹤0.01%
15,565
+577
+4% +$6.22K
CNYA icon
1473
iShares MSCI China A ETF
CNYA
$208M
$193K ﹤0.01%
5,573
+4,500
+419% +$154K
PDSB icon
1474
PDS Biotechnology
PDSB
$40.9M
$192K ﹤0.01%
250,000
– –
TFI icon
1475
State Street SPDR Nuveen ICE Municipal Bond ETF
TFI
$3.17B
$192K ﹤0.01%
4,204
– –
57 58
59
60 61

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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.