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William Blair & Company

William Blair & Company Portfolio holdings

AUM $34.9B
1-Year Est. Return 18.88%
This Fund
S&P 500
This Quarter Est. Return
+12.61%
1 Year Est. Return
+18.88%
3 Year Est. Return
+73.84%
5 Year Est. Return
+90.13%
10 Year Est. Return
+563.35%
AUM
$36B
AUM Growth
+$2.85B
Cap. Flow
-$222M
Cap. Flow %
-0.62%
Top 10 Hldgs %
24.91%
Holding
1,911
New
111
Increased
662
Reduced
757
Closed
87

Top Buys

Rank Stock Value
1
GEV icon
GE Vernova
GEV
+$116M
2
BA icon
Boeing
BA
+$34M
3
CWAN
Clearwater Analytics
CWAN
+$31.2M
4
NVDA icon
NVIDIA
NVDA
+$27.5M
5
NET icon
Cloudflare
NET
+$26.2M

Top Sells

Rank Stock Value
1
XYZ
Block Inc
XYZ
+$79.4M
2
ZTS icon
Zoetis
ZTS
+$41.3M
3
ACN icon
Accenture
ACN
+$40.8M
4
IJH icon
iShares Core S&P Mid-Cap ETF
IJH
+$40.7M
5
UNH icon
UnitedHealth
UNH
+$36.4M

Sector Composition

Rank Sector Weight
1 Technology 27.47%
2 Financials 13.92%
3 Industrials 12.94%
4 Healthcare 11.51%
5 Consumer Discretionary 7.98%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
SG icon
251
Sweetgreen
SG
$642M
$17.2M 0.05%
1,157,405
+1,040,629
+891% +$17.2M
PLNT icon
252
Planet Fitness
PLNT
$3.96B
$17.2M 0.05%
157,891
+31,038
+24% +$3.11M
CEG icon
253
Constellation Energy
CEG
$96.4B
$17.2M 0.05%
53,167
+3,728
+8% +$987K
SBAC icon
254
SBA Communications
SBAC
$19.5B
$16.9M 0.05%
72,147
-2,805
-4% -$642K
ESGD icon
255
iShares ESG Aware MSCI EAFE ETF
ESGD
$12.3B
$16.9M 0.05%
188,998
+1,286
+0.7% +$110K
ARES icon
256
Ares Management
ARES
$30.9B
$16.6M 0.05%
95,794
+532
+0.6% +$84.1K
DGX icon
257
Quest Diagnostics
DGX
$26.3B
$16.4M 0.05%
91,209
+38,588
+73% +$6.7M
MCHP icon
258
Microchip Technology
MCHP
$46B
$16.3M 0.05%
232,085
-49,381
-18% -$2.71M
WCN
259
Waste Connections
WCN
$42B
$16.3M 0.05%
87,248
+6,449
+8% +$1.24M
XLV icon
260
State Street Health Care Select Sector SPDR ETF
XLV
$42.7B
$16.3M 0.05%
120,793
-2,037
-2% -$275K
SMG icon
261
ScottsMiracle-Gro
SMG
$3.66B
$16M 0.04%
243,054
+52,447
+28% +$3.03M
VOT icon
262
Vanguard Morningstar Mid-Cap Growth ETF
VOT
$19.9B
$16M 0.04%
56,314
+12,892
+30% +$3.32M
IT icon
263
Gartner
IT
$11.7B
$16M 0.04%
39,584
-1,322
-3% -$553K
SPHQ icon
264
Invesco S&P 500 Quality ETF
SPHQ
$19.7B
$15.8M 0.04%
222,150
+40,192
+22% +$2.72M
GDX icon
265
VanEck Gold Miners ETF
GDX
$27.4B
$15.8M 0.04%
302,873
+6,724
+2% +$334K
WST icon
266
West Pharmaceutical
WST
$24.9B
$15.7M 0.04%
71,736
-10,849
-13% -$2.32M
BROS icon
267
Dutch Bros
BROS
$9.26B
$15.6M 0.04%
228,604
+49,501
+28% +$3.23M
BKNG icon
268
Booking.com
BKNG
$161B
$15.6M 0.04%
67,275
-425
-0.6% -$87K
IVW icon
269
iShares S&P 500 Growth ETF
IVW
$77.6B
$15.5M 0.04%
141,169
-4,864
-3% -$481K
PJAN icon
270
Innovator US Equity Power Buffer ETF January
PJAN
$1.45B
$15.5M 0.04%
351,885
+802
+0.2% +$33.7K
AMAT icon
271
Applied Materials
AMAT
$428B
$15.4M 0.04%
84,109
-682
-0.8% -$108K
PJUL icon
272
Innovator US Equity Power Buffer ETF July
PJUL
$1.27B
$15.4M 0.04%
350,501
+411
+0.1% +$16.8K
KMI icon
273
Kinder Morgan
KMI
$68.7B
$15.3M 0.04%
519,173
+2,780
+0.5% +$76.3K
T icon
274
AT&T
T
$163B
$15.2M 0.04%
524,603
+15,271
+3% +$421K
SHAK icon
275
Shake Shack
SHAK
$2.87B
$15.1M 0.04%
107,456
-224
-0.2% -$24.4K
9 10
11
12 13

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William Blair & Company's Q2 2025 Portfolio in Review

As of Q2 2025, William Blair & Company held 1,911 positions worth $36B, up 8.6% from $33.2B the previous quarter. Its ten largest holdings account for 25% of the portfolio.

William Blair & Company's Q2 2025 filing shows 111 new, 662 increased, 757 reduced and 87 closed positions. Its largest new stake was Affirm: 304,959 shares worth $21.1M. The largest sale was Block Inc, an estimated $79.4M.

By sector, the portfolio is most concentrated in Technology at 27% of assets, up from 26% a quarter earlier, followed by Financials and Industrials.

  • William Blair & Company's largest Q2 2025 buy was Affirm: 304,959 shares worth $21.1M.
  • William Blair & Company added most to GE Vernova in Q2 2025, an estimated $116M increase.
  • William Blair & Company's biggest Q2 2025 reduction was Block Inc, cutting an estimated $79.4M.
  • William Blair & Company fully exited Discover Financial Services in Q2 2025, selling an estimated $5.21M.
  • William Blair & Company's ten largest holdings make up 25% of its $36B portfolio in Q2 2025.
  • William Blair & Company opened 111 new positions and closed 87 in Q2 2025.
  • William Blair & Company's portfolio value rose 8.6% quarter-over-quarter to $36B.

Based on William Blair & Company's 13F filing for Q2 2025, filed 24 Jul 2025.