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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
SPXU icon
1801
ProShares UltraPro Short S&P 500
SPXU
$385M
$721 ﹤0.01%
8
– –
PSR icon
1802
Invesco Active US Real Estate Fund
PSR
$59M
$361 ﹤0.01%
4
– –
ISPOW
1803
DELISTED
Inspirato Inc Warrant
ISPOW
$150 ﹤0.01%
15,000
– –
PIIIW icon
1804
P3 Health Partners Inc Warrant
PIIIW
$199K
$92 ﹤0.01%
7,765
– –
SRS icon
1805
ProShares UltraShort Real Estate
SRS
$16.2M
$52 ﹤0.01%
1
– –
ACHC icon
1806
Acadia Healthcare
ACHC
$2.98B
– –
-12,723
Closed -$807K
ACLS icon
1807
Axcelis
ACLS
$4.38B
– –
-13,530
Closed -$1.42M
AES icon
1808
AES
AES
$10.5B
– –
-23,591
Closed -$473K
ASB icon
1809
Associated Banc-Corp
ASB
$6.08B
– –
-11,663
Closed -$251K
ATI icon
1810
ATI
ATI
$31.5B
– –
-3,587
Closed -$240K
AVTR icon
1811
Avantor
AVTR
$9.37B
– –
-25,061
Closed -$648K
BPMC
1812
DELISTED
Blueprint Medicines
BPMC
– –
-6,512
Closed -$602K
BUD icon
1813
AB InBev
BUD
$156B
– –
-4,592
Closed -$304K
BURL icon
1814
Burlington
BURL
$22.4B
– –
-2,542
Closed -$670K
CCK icon
1815
Crown Holdings
CCK
$13.2B
– –
-7,001
Closed -$671K
CHE icon
1816
Chemed
CHE
$7.08B
– –
-2,468
Closed -$1.48M
CNQ icon
1817
Canadian Natural Resources
CNQ
$98.2B
– –
-6,846
Closed -$227K
CPRI icon
1818
Capri Holdings
CPRI
$1.78B
– –
-5,769
Closed -$245K
CRCT icon
1819
Cricut
CRCT
$1.24B
– –
-12,470
Closed -$86.4K
CRDO icon
1820
Credo Technology Group
CRDO
$50.1B
– –
-11,482
Closed -$354K
CSL icon
1821
Carlisle Companies
CSL
$15.2B
– –
-509
Closed -$229K
CTXR icon
1822
Citius Pharmaceuticals
CTXR
$21M
– –
-3,648
Closed -$45.7K
EIDO icon
1823
iShares MSCI Indonesia ETF
EIDO
$492M
– –
-32
Closed -$720
ENPH icon
1824
Enphase Energy
ENPH
$5.41B
– –
-4,413
Closed -$499K
EXLS icon
1825
EXL Service
EXLS
$5.24B
– –
-26,300
Closed -$1M
71 72
73
74 75

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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.