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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
ACN icon
26
Accenture
ACN
$110B
$257M 0.75%
731,875
+87,785
+14% +$31.6M
VEEV icon
27
Veeva Systems
VEEV
$38.4B
$256M 0.74%
1,216,231
+3,608
+0.3% +$793K
TYL icon
28
Tyler Technologies
TYL
$13.2B
$250M 0.73%
433,821
-12,934
-3% -$7.82M
ISRG icon
29
Intuitive Surgical
ISRG
$142B
$245M 0.71%
468,880
+4,101
+0.9% +$2.14M
CSGP icon
30
CoStar Group
CSGP
$12.6B
$243M 0.71%
3,393,951
-456,885
-12% -$34.5M
UBER icon
31
Uber
UBER
$160B
$243M 0.71%
4,022,575
-59,551
-1% -$4.25M
IVV icon
32
iShares Core S&P 500 ETF
IVV
$902B
$242M 0.7%
410,742
+16,990
+4% +$10.1M
POOL icon
33
Pool Corp
POOL
$7.32B
$241M 0.7%
708,190
-55,999
-7% -$20.4M
CRM icon
34
Salesforce
CRM
$162B
$239M 0.69%
713,634
-7,406
-1% -$2.36M
PANW icon
35
Palo Alto Networks
PANW
$313B
$237M 0.69%
1,304,027
+11,167
+0.9% +$2.11M
FAST icon
36
Fastenal
FAST
$60.1B
$234M 0.68%
6,513,534
-35,618
-0.5% -$1.39M
BX icon
37
Blackstone
BX
$110B
$233M 0.68%
1,352,435
+17,828
+1% +$3.11M
INTU icon
38
Intuit
INTU
$92B
$230M 0.67%
365,518
-41,333
-10% -$26.4M
WMT icon
39
Walmart Inc
WMT
$901B
$226M 0.66%
2,506,613
-42,352
-2% -$3.68M
TDG icon
40
TransDigm Group
TDG
$68.7B
$226M 0.66%
178,343
+674
+0.4% +$888K
META icon
41
Meta Platforms (Facebook)
META
$1.53T
$221M 0.64%
377,272
+20,594
+6% +$12.1M
AXP icon
42
American Express
AXP
$230B
$214M 0.62%
720,237
-11,961
-2% -$3.44M
ABBV icon
43
AbbVie
ABBV
$442B
$213M 0.62%
1,201,107
+29,771
+3% +$5.47M
APH icon
44
Amphenol
APH
$206B
$213M 0.62%
3,070,194
-22,496
-0.7% -$1.57M
P
45
Everpure Inc
P
$36.4B
$212M 0.62%
3,444,714
+317,712
+10% +$17.7M
GWRE icon
46
Guidewire Software
GWRE
$14.7B
$205M 0.6%
1,213,515
-34,642
-3% -$6.47M
AON icon
47
Aon
AON
$75.6B
$203M 0.59%
564,247
-28,303
-5% -$10.4M
ECL icon
48
Ecolab
ECL
$79.8B
$198M 0.58%
844,034
-24,725
-3% -$6.15M
BRK.B icon
49
Berkshire Hathaway Class B
BRK.B
$1.11T
$190M 0.55%
419,119
+11,262
+3% +$5.2M
UNH icon
50
UnitedHealth
UNH
$361B
$187M 0.54%
369,909
-22,845
-6% -$13M
1
2
3 4 5

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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.