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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
EWA icon
1576
iShares MSCI Australia ETF
EWA
$1.46B
$61.6K ﹤0.01%
2,580
– –
DFEB icon
1577
FT Vest US Equity Deep Buffer ETF February
DFEB
$463M
$60.9K ﹤0.01%
1,426
– –
GGT
1578
Gabelli Multimedia Trust
GGT
$178M
$59.7K ﹤0.01%
13,392
– –
IDU icon
1579
iShares US Utilities ETF
IDU
$1.37B
$59.6K ﹤0.01%
620
– –
LMBS icon
1580
First Trust Exchange-Traded Fund IV First Trust Low Duration Opportunities ETF
LMBS
$6.39B
$58.9K ﹤0.01%
1,211
-429
-26% -$21K
RNTX
1581
Rein Therapeutics
RNTX
$68.9M
$58.9K ﹤0.01%
25,602
– –
EWY icon
1582
iShares MSCI South Korea ETF
EWY
$27.2B
$58.4K ﹤0.01%
1,147
-51
-4% -$2.97K
GVI icon
1583
iShares Intermediate Government/Credit Bond ETF
GVI
$3.79B
$58K ﹤0.01%
557
+17
+3% +$1.79K
JETS icon
1584
US Global Jets ETF
JETS
$825M
$58K ﹤0.01%
2,286
– –
TBF icon
1585
ProShares Short 20+ Year Treasury ETF
TBF
$106M
$57.9K ﹤0.01%
2,350
– –
BBD icon
1586
Banco Bradesco
BBD
$34.9B
$57.3K ﹤0.01%
29,980
-482
-2% -$1.13K
AVPTW
1587
DELISTED
AvePoint Inc Warrant
AVPTW
$56.6K ﹤0.01%
10,000
– –
EWJV icon
1588
iShares MSCI Japan Value ETF
EWJV
$754M
$54.7K ﹤0.01%
1,750
– –
LLYVK icon
1589
Liberty Live Group Series C
LLYVK
$9.8B
$54.5K ﹤0.01%
801
-19
-2% -$1.21K
SPYX icon
1590
State Street SPDR S&P 500 Fossil Fuel Reserves Free ETF
SPYX
$2.87B
$54.3K ﹤0.01%
1,128
– –
VTWG icon
1591
Vanguard Russell 2000 Growth ETF
VTWG
$1.56B
$53.6K ﹤0.01%
255
– –
NEPH icon
1592
Nephros
NEPH
$47.4M
$53.3K ﹤0.01%
36,249
– –
PFXF icon
1593
VanEck Preferred Securities ex Financials ETF
PFXF
$2.47B
$53.1K ﹤0.01%
3,077
+743
+32% +$13.4K
FPX icon
1594
First Trust US Equity Opportunities ETF
FPX
$1.53B
$52.6K ﹤0.01%
440
– –
ISCG icon
1595
iShares Morningstar Small-Cap Growth ETF
ISCG
$1.02B
$52.5K ﹤0.01%
1,062
– –
CURV icon
1596
Torrid Holdings
CURV
$228M
$52.3K ﹤0.01%
10,000
-11,000
-52% -$44.3K
JSMD icon
1597
Janus Henderson Small/Mid Cap Growth Alpha ETF
JSMD
$1.1B
$51.6K ﹤0.01%
687
+4
+0.6% +$306
ITEQ icon
1598
Amplify BlueStar Israel Technology ETF
ITEQ
$118M
$51.5K ﹤0.01%
1,000
– –
XES icon
1599
State Street SPDR S&P Oil & Gas Equipment & Services ETF
XES
$390M
$50.4K ﹤0.01%
639
– –
RSPM icon
1600
Invesco S&P 500 Equal Weight Materials ETF
RSPM
$184M
$49.2K ﹤0.01%
1,510
– –
62 63
64
65 66

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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.