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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
CTAS icon
51
Cintas
CTAS
$81.8B
$185M 0.54%
1,012,398
+13,541
+1% +$2.85M
AVGO icon
52
Broadcom
AVGO
$1.99T
$178M 0.52%
767,292
+91,825
+14% +$17M
ABT icon
53
Abbott
ABT
$192B
$178M 0.52%
1,572,084
-27,037
-2% -$3.12M
RYAN icon
54
Ryan Specialty Holdings
RYAN
$10.9B
$177M 0.52%
2,765,963
+16,540
+0.6% +$1.15M
DXCM icon
55
DexCom
DXCM
$34.1B
$174M 0.51%
2,232,647
-509,462
-19% -$37.7M
PG icon
56
Procter & Gamble
PG
$336B
$165M 0.48%
986,834
-9,867
-1% -$1.68M
VEA icon
57
Vanguard FTSE Developed Markets ETF
VEA
$238B
$151M 0.44%
3,153,008
+31,312
+1% +$1.57M
JNJ icon
58
Johnson & Johnson
JNJ
$628B
$145M 0.42%
1,003,860
-49,666
-5% -$7.7M
AMT icon
59
American Tower
AMT
$79.5B
$145M 0.42%
790,497
-5,508
-0.7% -$1.14M
CMG icon
60
Chipotle Mexican Grill
CMG
$41.2B
$145M 0.42%
2,403,659
+77,719
+3% +$4.68M
AAON icon
61
Aaon
AAON
$7.01B
$138M 0.4%
1,169,782
+47,254
+4% +$5.79M
VOO icon
62
Vanguard S&P 500 ETF
VOO
$1.03T
$137M 0.4%
255,034
+14,962
+6% +$8.1M
QQQ icon
63
Invesco QQQ Trust
QQQ
$482B
$130M 0.38%
253,793
+20,454
+9% +$10.3M
VIG icon
64
Vanguard Dividend Appreciation ETF
VIG
$115B
$127M 0.37%
650,925
-3,440
-0.5% -$687K
AME icon
65
Ametek
AME
$59.3B
$127M 0.37%
706,402
-11,793
-2% -$2.15M
UNP icon
66
Union Pacific
UNP
$174B
$127M 0.37%
556,630
-41,506
-7% -$9.83M
XYZ
67
Block Inc
XYZ
$46.7B
$125M 0.36%
1,474,681
+982,699
+200% +$80.6M
NFLX icon
68
Netflix
NFLX
$309B
$122M 0.35%
1,363,900
-2,890
-0.2% -$238K
VTV icon
69
Vanguard Morningstar Value ETF
VTV
$193B
$120M 0.35%
708,997
+22,171
+3% +$3.89M
SBUX icon
70
Starbucks
SBUX
$123B
$118M 0.34%
1,287,827
-55,999
-4% -$5.42M
IWM icon
71
iShares Russell 2000 ETF
IWM
$82.2B
$117M 0.34%
529,808
+35,522
+7% +$8.1M
VEU icon
72
Vanguard FTSE All-World ex-US ETF
VEU
$70.5B
$112M 0.33%
1,958,504
-130,228
-6% -$7.85M
TSLA icon
73
Tesla
TSLA
$1.29T
$111M 0.32%
274,154
+30,380
+12% +$9.77M
ITW icon
74
Illinois Tool Works
ITW
$83.2B
$108M 0.31%
426,768
+4,671
+1% +$1.24M
VRSK icon
75
Verisk Analytics
VRSK
$23.4B
$108M 0.31%
391,444
-14,428
-4% -$4.02M
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.