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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
TPR icon
1101
Tapestry
TPR
$33.3B
$563K ﹤0.01%
4,403
+65
+1% +$7.43K
XAR icon
1102
State Street SPDR S&P Aerospace & Defense ETF
XAR
$6.53B
$562K ﹤0.01%
2,331
+31
+1% +$7.37K
BWIN
1103
Baldwin Insurance Group
BWIN
$2.79B
$561K ﹤0.01%
23,357
-6,687
-22% -$170K
OBDC icon
1104
Blue Owl Capital
OBDC
$5.7B
$560K ﹤0.01%
45,070
-15,071
-25% -$192K
IDEV icon
1105
iShares Core MSCI International Developed Markets ETF
IDEV
$32.5B
$558K ﹤0.01%
6,770
+2,543
+60% +$207K
EPP icon
1106
iShares MSCI Pacific ex Japan ETF
EPP
$2.26B
$557K ﹤0.01%
11,035
-56
-0.5% -$2.86K
IONQ icon
1107
IonQ
IONQ
$17.2B
$555K ﹤0.01%
12,368
+1,423
+13% +$79.7K
SHM icon
1108
State Street SPDR Nuveen ICE Short Term Municipal Bond ETF
SHM
$3.47B
$555K ﹤0.01%
11,563
+20
+0.2% +$960
NJUL icon
1109
Innovator Growth-100 Power Buffer ETF July
NJUL
$260M
$554K ﹤0.01%
7,628
– –
MBB icon
1110
iShares MBS ETF
MBB
$38.9B
$552K ﹤0.01%
5,800
-39
-0.7% -$3.72K
ISTB icon
1111
iShares Core 1-5 Year USD Bond ETF
ISTB
$5.12B
$552K ﹤0.01%
11,327
-946
-8% -$46.2K
NGG icon
1112
National Grid
NGG
$79.9B
$550K ﹤0.01%
7,106
-103
-1% -$7.75K
ETON icon
1113
Eton Pharmaceutcials
ETON
$1.2B
$548K ﹤0.01%
32,400
– –
CLS icon
1114
Celestica
CLS
$39.7B
$545K ﹤0.01%
1,844
+125
+7% +$37.7K
XNTK icon
1115
State Street SPDR NYSE Technology ETF
XNTK
$2.22B
$545K ﹤0.01%
1,960
+1
+0.1% +$279
ACWV icon
1116
iShares MSCI Global Min Vol Factor ETF
ACWV
$3.38B
$544K ﹤0.01%
4,584
-573
-11% -$68.5K
CAKE icon
1117
Cheesecake Factory
CAKE
$5.53B
$542K ﹤0.01%
10,745
-573
-5% -$28.7K
BHC icon
1118
Bausch Health
BHC
$2.37B
$542K ﹤0.01%
78,002
-775
-1% -$5.1K
TLTD icon
1119
FlexShares Morningstar Developed Markets ex-US Factor Tilt Index Fund
TLTD
$686M
$539K ﹤0.01%
5,809
+713
+14% +$64.3K
HRMY icon
1120
Harmony Biosciences
HRMY
$2.27B
$535K ﹤0.01%
14,309
+16
+0.1% +$526
SLDE
1121
Slide Insurance Holdings
SLDE
$2.41B
$533K ﹤0.01%
+27,385
New +$457K
ICLN icon
1122
iShares Global Clean Energy ETF
ICLN
$2.08B
$533K ﹤0.01%
32,455
-147
-0.5% -$2.45K
PPL
1123
PPL Corp
PPL
$26.3B
$533K ﹤0.01%
15,210
+40
+0.3% +$1.44K
SMWB icon
1124
Similarweb
SMWB
$650M
$532K ﹤0.01%
71,044
-31,579
-31% -$255K
FTAI icon
1125
FTAI Aviation
FTAI
$22.1B
$530K ﹤0.01%
2,694
-1,248
-32% -$213K
43 44
45
46 47

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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.