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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
U icon
601
Unity
U
$19.9B
$3.21M 0.01%
142,716
-17,135
-11% -$381K
WMB icon
602
Williams Companies
WMB
$90B
$3.2M 0.01%
59,121
+11,750
+25% +$633K
CWST icon
603
Casella Waste Systems
CWST
$5.79B
$3.2M 0.01%
30,196
+22,726
+304% +$2.4M
JAMF
604
DELISTED
Jamf
JAMF
$3.19M 0.01%
227,151
+56,699
+33% +$894K
CVS icon
605
CVS Health
CVS
$121B
$3.19M 0.01%
70,996
-36,875
-34% -$2.07M
BFEB icon
606
Innovator US Equity Buffer ETF February
BFEB
$259M
$3.19M 0.01%
73,979
– –
SCHF icon
607
Schwab International Equity ETF
SCHF
$69.4B
$3.18M 0.01%
171,840
+4,842
+3% +$94.5K
DXJ icon
608
WisdomTree Japan Hedged Equity Fund
DXJ
$7.55B
$3.16M 0.01%
28,675
+64
+0.2% +$7.01K
CLBT icon
609
Cellebrite
CLBT
$2.6B
$3.16M 0.01%
143,476
+19,433
+16% +$374K
TWST icon
610
Twist Bioscience
TWST
$7.8B
$3.16M 0.01%
67,946
-19,355
-22% -$875K
IBB icon
611
iShares Biotechnology ETF
IBB
$9.82B
$3.14M 0.01%
23,767
-40,132
-63% -$5.64M
ADSK icon
612
Autodesk
ADSK
$51.9B
$3.12M 0.01%
10,542
-96
-0.9% -$28.4K
SRE icon
613
Sempra
SRE
$56.4B
$3.11M 0.01%
35,462
+903
+3% +$79K
CIBR icon
614
First Trust NASDAQ Cybersecurity ETF
CIBR
$15.8B
$3.11M 0.01%
49,020
+6,788
+16% +$426K
MEC icon
615
Mayville Engineering Co
MEC
$601M
$3.11M 0.01%
197,740
+39,278
+25% +$718K
GTLB icon
616
GitLab
GTLB
$6.87B
$3.09M 0.01%
54,774
+2,980
+6% +$174K
ROST icon
617
Ross Stores
ROST
$78.2B
$3.05M 0.01%
20,142
-47
-0.2% -$6.91K
SPYG icon
618
State Street SPDR Portfolio S&P 500 Growth ETF
SPYG
$55.6B
$3.04M 0.01%
34,606
+1,002
+3% +$86.6K
QYLD icon
619
Global X NASDAQ-100 Covered Call ETF
QYLD
$8.29B
$3.04M 0.01%
166,912
+13,520
+9% +$247K
KDEC
620
Innovator U.S. Small Cap Power Buffer ETF - December
KDEC
$73.6M
$2.99M 0.01%
+124,860
New +$3.05M
ILMN icon
621
Illumina
ILMN
$28.9B
$2.98M 0.01%
22,332
-1,845
-8% -$263K
CACI icon
622
CACI
CACI
$14.9B
$2.98M 0.01%
7,367
-386
-5% -$188K
IJK icon
623
iShares S&P Mid-Cap 400 Growth ETF
IJK
$11.3B
$2.97M 0.01%
32,682
+877
+3% +$82.6K
HEFA icon
624
iShares Currency Hedged MSCI EAFE ETF
HEFA
$7.81B
$2.97M 0.01%
85,430
-58,690
-41% -$2.07M
HAL icon
625
Halliburton
HAL
$27.5B
$2.97M 0.01%
109,175
-180,953
-62% -$5.29M
23 24
25
26 27

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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.