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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
OKE icon
276
Oneok
OKE
$58.3B
$14.8M 0.04%
147,224
+7,246
+5% +$741K
TW icon
277
Tradeweb Markets
TW
$21.9B
$14.8M 0.04%
112,811
+818
+0.7% +$108K
TSCO icon
278
Tractor Supply
TSCO
$19B
$14.7M 0.04%
277,380
-4,950
-2% -$280K
PJUL icon
279
Innovator US Equity Power Buffer ETF July
PJUL
$1.29B
$14.7M 0.04%
356,650
-5,205
-1% -$213K
IVW icon
280
iShares S&P 500 Growth ETF
IVW
$77.3B
$14.6M 0.04%
144,242
+2,346
+2% +$234K
SHW icon
281
Sherwin-Williams
SHW
$87.4B
$14.5M 0.04%
42,662
+3,740
+10% +$1.4M
NTRS icon
282
Northern Trust
NTRS
$35B
$14.5M 0.04%
141,291
-3,040
-2% -$311K
VMI icon
283
Valmont Industries
VMI
$9.52B
$14.5M 0.04%
47,219
-847
-2% -$273K
PH icon
284
Parker-Hannifin
PH
$135B
$14.4M 0.04%
22,688
-2,327
-9% -$1.54M
DOV icon
285
Dover
DOV
$28B
$14.4M 0.04%
76,841
-175
-0.2% -$34.2K
KMI icon
286
Kinder Morgan
KMI
$70.7B
$14.4M 0.04%
524,553
-6,470
-1% -$169K
ESGD icon
287
iShares ESG Aware MSCI EAFE ETF
ESGD
$12.3B
$14.3M 0.04%
187,831
-14,312
-7% -$1.14M
ULTA icon
288
Ulta Beauty
ULTA
$22.9B
$14.3M 0.04%
32,869
-33,525
-50% -$13M
JLL icon
289
Jones Lang LaSalle
JLL
$16.7B
$14.3M 0.04%
56,464
+7,511
+15% +$2M
VB icon
290
Vanguard Morningstar Small-Cap ETF
VB
$83B
$14.3M 0.04%
59,452
+1,923
+3% +$473K
WCN
291
Waste Connections
WCN
$41.6B
$14M 0.04%
81,747
-1,625
-2% -$295K
APPF icon
292
AppFolio
APPF
$6.97B
$14M 0.04%
56,693
-1,788
-3% -$419K
KRNT icon
293
Kornit Digital
KRNT
$817M
$13.9M 0.04%
449,727
-92,146
-17% -$2.64M
VLTO icon
294
Veralto
VLTO
$23.6B
$13.9M 0.04%
136,648
-11,795
-8% -$1.26M
IRT icon
295
Independence Realty Trust
IRT
$3.96B
$13.8M 0.04%
696,198
-5,898
-0.8% -$120K
BKNG icon
296
Booking.com
BKNG
$159B
$13.7M 0.04%
68,725
+1,525
+2% +$293K
SHAK icon
297
Shake Shack
SHAK
$2.94B
$13.5M 0.04%
104,389
-4,145
-4% -$508K
AMAT icon
298
Applied Materials
AMAT
$435B
$13.5M 0.04%
83,064
+310
+0.4% +$56.2K
VXF icon
299
Vanguard Extended Market ETF
VXF
$32.1B
$13.4M 0.04%
70,277
+5,262
+8% +$1.01M
TEAM icon
300
Atlassian
TEAM
$39.4B
$13.3M 0.04%
54,467
-1,733
-3% -$397K
10 11
12
13 14

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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.