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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
+606.62%
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 Miscellaneous 11.74%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
EXPE icon
1826
Expedia Group
EXPE
$33.7B
– –
-1,353
Closed -$200K
FA icon
1827
First Advantage
FA
$3.64B
– –
-16,500
Closed -$328K
FGD icon
1828
First Trust Dow Jones Global Select Dividend Index Fund
FGD
$1.64B
– –
-1,082
Closed -$26.3K
FOLD
1829
DELISTED
Amicus Therapeutics
FOLD
– –
-60,266
Closed -$644K
FOXF icon
1830
Fox Factory Holding Corp
FOXF
$833M
– –
-7,258
Closed -$301K
FTXL icon
1831
First Trust Nasdaq Semiconductor ETF
FTXL
$1.17B
– –
-220
Closed -$20.5K
H icon
1832
Hyatt Hotels
H
$15.4B
– –
-6,503
Closed -$990K
HALO icon
1833
Halozyme
HALO
$12.3B
– –
-4,149
Closed -$237K
HYEM icon
1834
VanEck Emerging Markets High Yield Bond ETF
HYEM
$521M
– –
-802
Closed -$16K
PPLI
1835
People Inc
PPLI
$2.9B
– –
-4,663
Closed -$206K
IHE icon
1836
iShares US Pharmaceuticals ETF
IHE
$1.63B
– –
-52
Closed -$3.67K
ILF icon
1837
iShares Latin America 40 ETF
ILF
$3.93B
– –
-784
Closed -$20.3K
INCY icon
1838
Incyte
INCY
$24.8B
– –
-20,934
Closed -$1.38M
INSM icon
1839
Insmed
INSM
$27.4B
– –
-9,091
Closed -$664K
IVOL icon
1840
Quadratic Interest Rate Volatility and Inflation Hedge ETF
IVOL
$256M
– –
-4,324
Closed -$83.2K
KBR icon
1841
KBR
KBR
$4.61B
– –
-18,800
Closed -$1.22M
KFRC icon
1842
Kforce
KFRC
$936M
– –
-3,405
Closed -$209K
KOS icon
1843
Kosmos Energy
KOS
$1.74B
– –
-69,662
Closed -$281K
KWEB icon
1844
KraneShares CSI China Internet ETF
KWEB
$4.73B
– –
-8,327
Closed -$283K
KXI icon
1845
iShares Global Consumer Staples ETF
KXI
$1.09B
– –
-129
Closed -$8.48K
MGPI icon
1846
MGP Ingredients
MGPI
$316M
– –
-8,961
Closed -$746K
DFTX
1847
Definium Therapeutics
DFTX
$5.41B
– –
-11,000
Closed -$62.6K
MRVI icon
1848
Maravai LifeSciences
MRVI
$995M
– –
-10,566
Closed -$87.8K
MSA icon
1849
Mine Safety
MSA
$7.03B
– –
-1,420
Closed -$252K
MSM icon
1850
MSC Industrial Direct
MSM
$6.66B
– –
-5,244
Closed -$451K
72 73
74
75 76

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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.