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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
TFI icon
1376
State Street SPDR Nuveen ICE Municipal Bond ETF
TFI
$3.17B
$238K ﹤0.01%
5,219
+124
+2% +$5.72K
SUSC icon
1377
iShares ESG Aware USD Corporate Bond ETF
SUSC
$1.29B
$236K ﹤0.01%
10,405
-17
-0.2% -$394
LAD icon
1378
Lithia Motors
LAD
$8.32B
$236K ﹤0.01%
661
– –
FNDA icon
1379
Schwab Fundamental US Small Company Index ETF
FNDA
$9.38B
$236K ﹤0.01%
7,932
+1,078
+16% +$32.9K
PSEC icon
1380
Prospect Capital
PSEC
$1.15B
$235K ﹤0.01%
54,600
– –
QBTS icon
1381
D-Wave Quantum Inc. Common Stock
QBTS
$7.72B
$235K ﹤0.01%
27,935
+6,435
+30% +$19.3K
AIVL icon
1382
WisdomTree US AI Enhanced Value Fund
AIVL
$436M
$234K ﹤0.01%
2,198
– –
BOH icon
1383
Bank of Hawaii
BOH
$3.13B
$234K ﹤0.01%
3,282
-2,722
-45% -$196K
WU icon
1384
Western Union
WU
$2.23B
$232K ﹤0.01%
21,893
-2,296
-9% -$25.4K
ICLN icon
1385
iShares Global Clean Energy ETF
ICLN
$2.12B
$232K ﹤0.01%
20,362
-5,709
-22% -$72.2K
STX icon
1386
Seagate
STX
$199B
$231K ﹤0.01%
2,678
-381
-12% -$38.4K
TEM
1387
Tempus AI
TEM
$9.85B
$231K ﹤0.01%
6,839
-6,475
-49% -$320K
GTLS
1388
DELISTED
Chart Industries
GTLS
$231K ﹤0.01%
1,209
-4,387
-78% -$705K
QXO
1389
QXO Inc
QXO
$16.2B
$229K ﹤0.01%
+14,430
New +$227K
BFLY icon
1390
Butterfly Network
BFLY
$2.52B
$229K ﹤0.01%
73,500
+35,200
+92% +$91.6K
CQP icon
1391
Cheniere Energy
CQP
$33.3B
$228K ﹤0.01%
4,300
– –
IYE icon
1392
iShares US Energy ETF
IYE
$1.8B
$228K ﹤0.01%
5,006
+11
+0.2% +$527
VERU icon
1393
Veru
VERU
$46.7M
$228K ﹤0.01%
35,000
– –
FDL icon
1394
First Trust Morningstar Dividend Leaders Index Fund
FDL
$7.88B
$227K ﹤0.01%
5,637
-914
-14% -$38.4K
FTS icon
1395
Fortis
FTS
$28.7B
$226K ﹤0.01%
5,443
– –
CTRE icon
1396
CareTrust REIT
CTRE
$9.25B
$226K ﹤0.01%
8,343
– –
PAYC icon
1397
Paycom
PAYC
$9.52B
$225K ﹤0.01%
1,098
-171
-13% -$34.8K
FLUT icon
1398
Flutter Entertainment
FLUT
$17B
$225K ﹤0.01%
+869
New +$219K
MCY icon
1399
Mercury Insurance
MCY
$5.84B
$224K ﹤0.01%
3,373
– –
VRIG icon
1400
Invesco Variable Rate Investment Grade ETF
VRIG
$1.85B
$223K ﹤0.01%
8,882
+5
+0.1% +$126
54 55
56
57 58

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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.