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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
IRTC icon
126
iRhythm Holdings
IRTC
$4.13B
$54.5M 0.16%
604,737
-39,704
-6% -$3.12M
AXON
127
Axon Enterprise
AXON
$48.7B
$54.3M 0.16%
91,447
+16,351
+22% +$8.89M
BLK icon
128
Blackrock
BLK
$180B
$53.9M 0.16%
+52,623
New +$53.4M
CRWD icon
129
CrowdStrike
CRWD
$226B
$52.9M 0.15%
618,340
+138,584
+29% +$11.5M
BAC icon
130
Bank of America
BAC
$453B
$52.8M 0.15%
1,200,291
-29,219
-2% -$1.29M
DE icon
131
Deere & Co
DE
$167B
$52.3M 0.15%
123,409
-596
-0.5% -$251K
APP icon
132
Applovin
APP
$102B
$50.9M 0.15%
157,186
-9,024
-5% -$2.28M
SHOP icon
133
Shopify
SHOP
$194B
$49.7M 0.14%
467,025
+9,819
+2% +$955K
USFR icon
134
WisdomTree Floating Rate Treasury Fund
USFR
$18.4B
$49.4M 0.14%
981,294
-9,983
-1% -$503K
BRK.A icon
135
Berkshire Hathaway Class A
BRK.A
$1.09T
$48.3M 0.14%
71
+3
+4% +$2.08M
CWAN
136
DELISTED
Clearwater Analytics
CWAN
$48.3M 0.14%
1,754,732
+1,710,141
+3,835% +$48.5M
PODD icon
137
Insulet
PODD
$10.1B
$47.9M 0.14%
183,285
-4,778
-3% -$1.2M
EMR icon
138
Emerson Electric
EMR
$91.4B
$47.6M 0.14%
383,808
-1,529
-0.4% -$185K
BWXT icon
139
BWX Technologies
BWXT
$15.8B
$47.3M 0.14%
424,821
+384,323
+949% +$47M
TXN icon
140
Texas Instruments
TXN
$253B
$47.2M 0.14%
251,940
-2,771
-1% -$554K
HEI icon
141
HEICO Corp
HEI
$52.1B
$46.8M 0.14%
196,895
+26,873
+16% +$6.96M
AMGN icon
142
Amgen
AMGN
$225B
$46.5M 0.14%
178,596
-21,709
-11% -$6.44M
CSCO icon
143
Cisco
CSCO
$488B
$45.8M 0.13%
772,846
+5,302
+0.7% +$303K
TJX icon
144
TJX Companies
TJX
$169B
$44.7M 0.13%
369,806
+11,526
+3% +$1.38M
SDVY icon
145
First Trust SMID Cap Rising Dividend Achievers ETF
SDVY
$11.8B
$44.6M 0.13%
1,243,511
+149,453
+14% +$5.59M
IUSG icon
146
iShares Core S&P US Growth ETF
IUSG
$33.7B
$44M 0.13%
315,397
+71,824
+29% +$9.86M
TREX icon
147
Trex
TREX
$5.05B
$43.7M 0.13%
632,692
-132,533
-17% -$9.34M
IEFA icon
148
iShares Core MSCI EAFE ETF
IEFA
$196B
$43.7M 0.13%
621,315
+42,761
+7% +$3.15M
KMX icon
149
CarMax
KMX
$8.33B
$43.5M 0.13%
532,016
-82,146
-13% -$6.45M
GEV icon
150
GE Vernova
GEV
$277B
$43M 0.13%
130,595
+60,617
+87% +$18.9M
4 5
6
7 8

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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.