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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
+3.1%
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
$34.4B
AUM Growth
+$328M
Cap. Flow
-$18.6M
Cap. Flow %
-0.05%
Top 10 Hldgs %
25.12%
Holding
1,903
New
83
Increased
650
Reduced
792
Closed
87

Top Buys

Rank Stock Value
1
XYZ
Block Inc
XYZ
+$80.6M
2
BLK icon
Blackrock
BLK
+$53.4M
3
CWAN
Clearwater Analytics
CWAN
+$48.5M
4
NVDA icon
NVIDIA
NVDA
+$47.9M
5
BWXT icon
BWX Technologies
BWXT
+$47M

Top Sells

Rank Stock Value
1
DXCM icon
DexCom
DXCM
+$37.7M
2
CSGP icon
CoStar Group
CSGP
+$34.5M
3
VRTX icon
Vertex Pharmaceuticals
VRTX
+$30M
4
BAH icon
Booz Allen Hamilton
BAH
+$29.1M
5
IDXX icon
Idexx Laboratories
IDXX
+$26.6M

Sector Composition

Rank Sector Weight
1 Technology 28.35%
2 Financials 13.43%
3 Healthcare 12.44%
4 Industrials 11.81%
5 Consumer Discretionary 8.44%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
GL icon
1276
Globe Life
GL
$14B
$305K ﹤0.01%
2,739
+1
+0% +$108
CNP icon
1277
CenterPoint Energy
CNP
$26.7B
$305K ﹤0.01%
9,625
-510
-5% -$15.7K
DON icon
1278
WisdomTree US MidCap Dividend Fund
DON
$4.1B
$305K ﹤0.01%
5,975
– –
AEE icon
1279
Ameren
AEE
$30.3B
$304K ﹤0.01%
3,413
+12
+0.4% +$1.07K
WK icon
1280
Workiva
WK
$3.71B
$300K ﹤0.01%
2,744
-161
-6% -$14.8K
FRT icon
1281
Federal Realty Investment Trust
FRT
$10.3B
$300K ﹤0.01%
2,683
+891
+50% +$101K
CRH icon
1282
CRH
CRH
$65.9B
$300K ﹤0.01%
3,245
+234
+8% +$22.5K
RGEN icon
1283
Repligen
RGEN
$9.41B
$299K ﹤0.01%
2,080
-5
-0.2% -$717
WBS icon
1284
Webster Financial
WBS
$12.8B
$298K ﹤0.01%
5,398
– –
SEE
1285
DELISTED
Sealed Air
SEE
$298K ﹤0.01%
8,796
-17,138
-66% -$611K
ROBO icon
1286
ROBO Global Robotics & Automation Index ETF
ROBO
$2.12B
$297K ﹤0.01%
5,282
– –
ETHO icon
1287
Amplify Etho Climate Leadership US ETF
ETHO
$195M
$296K ﹤0.01%
4,961
+9
+0.2% +$551
FHN icon
1288
First Horizon
FHN
$12.3B
$296K ﹤0.01%
14,675
+100
+0.7% +$1.88K
ONEQ icon
1289
Fidelity Nasdaq Composite Index ETF
ONEQ
$10.9B
$295K ﹤0.01%
3,883
+41
+1% +$3.07K
CRL icon
1290
Charles River Laboratories
CRL
$13.6B
$295K ﹤0.01%
1,600
-76
-5% -$14.6K
SPYD icon
1291
State Street SPDR Portfolio S&P 500 High Dividend ETF
SPYD
$7.75B
$294K ﹤0.01%
6,807
– –
XBAP icon
1292
Innovator US Equity Accelerated 9 Buffer ETF April
XBAP
$133M
$293K ﹤0.01%
8,582
– –
BE icon
1293
Bloom Energy
BE
$72.5B
$291K ﹤0.01%
+13,116
New +$230K
VTGN icon
1294
VistaGen Therapeutics
VTGN
$11.6M
$290K ﹤0.01%
98,466
+10,000
+11% +$28.1K
UHS icon
1295
Universal Health Services
UHS
$10.1B
$289K ﹤0.01%
1,612
-38
-2% -$7.74K
GRBK icon
1296
Green Brick Partners
GRBK
$3.03B
$288K ﹤0.01%
5,105
+105
+2% +$7.46K
AAL icon
1297
American Airlines Group
AAL
$9.99B
$288K ﹤0.01%
16,545
-408
-2% -$5.87K
KNX icon
1298
Knight Transportation
KNX
$11.9B
$288K ﹤0.01%
5,433
+1,551
+40% +$84.4K
ITRN icon
1299
Ituran Location and Control
ITRN
$1.05B
$288K ﹤0.01%
9,250
– –
KIE icon
1300
State Street SPDR S&P Insurance ETF
KIE
$677M
$286K ﹤0.01%
5,056
+727
+17% +$42.3K
50 51
52
53 54

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William Blair & Company's Q4 2024 Portfolio in Review

As of Q4 2024, William Blair & Company held 1,903 positions worth $34.4B, up 0.96% from $34.1B the previous quarter. Its ten largest holdings account for 25% of the portfolio.

William Blair & Company's Q4 2024 filing shows 83 new, 650 increased, 792 reduced and 87 closed positions. Its largest new stake was Blackrock: 52,623 shares worth $53.9M. The largest sale was DexCom, an estimated $37.7M.

By sector, the portfolio is most concentrated in Technology at 28% of assets, up from 27% a quarter earlier, followed by Financials and Healthcare.

  • William Blair & Company's largest Q4 2024 buy was Blackrock: 52,623 shares worth $53.9M.
  • William Blair & Company added most to Block Inc in Q4 2024, an estimated $80.6M increase.
  • William Blair & Company's biggest Q4 2024 reduction was DexCom, cutting an estimated $37.7M.
  • William Blair & Company fully exited Rush Street Interactive in Q4 2024, selling an estimated $5.79M.
  • William Blair & Company's ten largest holdings make up 25% of its $34.4B portfolio in Q4 2024.
  • William Blair & Company opened 83 new positions and closed 87 in Q4 2024.
  • William Blair & Company's portfolio value rose 0.96% quarter-over-quarter to $34.4B.

Based on William Blair & Company's 13F filing for Q4 2024, filed 12 Feb 2025.