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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
TTWO icon
426
Take-Two Interactive
TTWO
$45.4B
$6.6M 0.02%
35,855
-204
-0.6% -$35.4K
BN icon
427
Brookfield
BN
$110B
$6.59M 0.02%
172,110
+7,834
+5% +$295K
CP icon
428
Canadian Pacific Kansas City
CP
$81.5B
$6.54M 0.02%
90,354
-1,817
-2% -$140K
SCHB icon
429
Schwab US Broad Market ETF
SCHB
$44.9B
$6.48M 0.02%
285,575
+40,928
+17% +$935K
LHX icon
430
L3Harris
LHX
$54.1B
$6.47M 0.02%
30,753
+617
+2% +$148K
SPYM
431
State Street SPDR Portfolio S&P 500 ETF
SPYM
$168B
$6.42M 0.02%
93,183
+59,494
+177% +$4.12M
DCI icon
432
Donaldson
DCI
$11.2B
$6.35M 0.02%
94,212
-1,557
-2% -$115K
WSC icon
433
WillScot Mobile Mini Holdings
WSC
$4B
$6.33M 0.02%
189,215
-34,303
-15% -$1.26M
TT icon
434
Trane Technologies
TT
$105B
$6.32M 0.02%
17,102
+1,142
+7% +$453K
INDA icon
435
iShares MSCI India ETF
INDA
$6.58B
$6.31M 0.02%
119,950
+463
+0.4% +$25.5K
RH icon
436
RH
RH
$3.41B
$6.3M 0.02%
16,014
+825
+5% +$293K
RSG icon
437
Republic Services
RSG
$65.6B
$6.3M 0.02%
31,307
-221
-0.7% -$45.8K
BROS icon
438
Dutch Bros
BROS
$8.91B
$6.26M 0.02%
119,561
-15,545
-12% -$686K
IWP icon
439
iShares Russell Mid-Cap Growth ETF
IWP
$21B
$6.24M 0.02%
49,268
+1,845
+4% +$235K
OKTA icon
440
Okta
OKTA
$25.6B
$6.24M 0.02%
79,172
-1,032
-1% -$80K
OEF icon
441
iShares S&P 100 ETF
OEF
$20.4B
$6.21M 0.02%
21,489
+464
+2% +$133K
ESGV icon
442
Vanguard ESG US Stock ETF
ESGV
$13.6B
$6.19M 0.02%
59,019
-111
-0.2% -$11.6K
BP icon
443
BP
BP
$111B
$6.17M 0.02%
208,757
+8,757
+4% +$263K
ARCC icon
444
Ares Capital
ARCC
$14.3B
$6.14M 0.02%
280,705
+8,986
+3% +$194K
STZ icon
445
Constellation Brands
STZ
$22.9B
$6.07M 0.02%
27,445
-736
-3% -$175K
DGX icon
446
Quest Diagnostics
DGX
$26.2B
$6.06M 0.02%
40,157
+5,218
+15% +$812K
LRN icon
447
Stride
LRN
$3.27B
$6.02M 0.02%
57,935
-14,681
-20% -$1.4M
DD icon
448
DuPont de Nemours
DD
$19.5B
$6.02M 0.02%
62,885
-536
-0.8% -$55.8K
MELI icon
449
Mercado Libre
MELI
$92.7B
$5.97M 0.02%
3,512
+1,232
+54% +$2.4M
URI icon
450
United Rentals
URI
$70.3B
$5.96M 0.02%
8,462
+1,315
+18% +$1.07M
16 17
18
19 20

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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.