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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
MDY icon
151
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$27B
$44.4M 0.12%
78,366
+2,685
+4% +$1.44M
CAT icon
152
Caterpillar
CAT
$399B
$44.1M 0.12%
113,544
-735
-0.6% -$245K
GLD icon
153
SPDR Gold Trust
GLD
$137B
$43.9M 0.12%
144,055
-30,206
-17% -$9.15M
GILD icon
154
Gilead Sciences
GILD
$161B
$42.8M 0.12%
386,347
-11,908
-3% -$1.27M
TXN icon
155
Texas Instruments
TXN
$256B
$42.2M 0.12%
203,490
-40,162
-16% -$7.13M
IJH icon
156
iShares Core S&P Mid-Cap ETF
IJH
$125B
$42.1M 0.12%
679,166
-693,955
-51% -$40.7M
COIN icon
157
Coinbase
COIN
$38.9B
$42M 0.12%
119,859
+81,167
+210% +$19M
IUSG icon
158
iShares Core S&P US Growth ETF
IUSG
$33.4B
$41.3M 0.11%
274,436
+736
+0.3% +$99.8K
BJ icon
159
BJs Wholesale Club
BJ
$12.4B
$40.9M 0.11%
379,716
+5,596
+1% +$638K
CME icon
160
CME Group
CME
$95.3B
$39.5M 0.11%
143,405
-1,220
-0.8% -$332K
NET icon
161
Cloudflare
NET
$101B
$39.4M 0.11%
201,229
+180,604
+876% +$26.2M
SCHD icon
162
Schwab US Dividend Equity ETF
SCHD
$104B
$39.3M 0.11%
1,483,361
-23,796
-2% -$621K
AJG icon
163
Arthur J. Gallagher & Co
AJG
$64B
$37.4M 0.1%
116,969
+18,620
+19% +$6.14M
SPMD icon
164
State Street SPDR Portfolio S&P 400 Mid Cap ETF
SPMD
$18.7B
$37.1M 0.1%
681,911
-10,011
-1% -$516K
MU icon
165
Micron Technology
MU
$1.01T
$36.2M 0.1%
293,958
-13,192
-4% -$1.23M
DSGX icon
166
Descartes Systems
DSGX
$6.52B
$35.8M 0.1%
352,415
+9,174
+3% +$968K
LULU icon
167
lululemon athletica
LULU
$14.2B
$35M 0.1%
147,267
-15,878
-10% -$4.37M
VO icon
168
Vanguard Morningstar Mid-Cap ETF
VO
$108B
$34.9M 0.1%
498,732
+37,628
+8% +$2.47M
EPD icon
169
Enterprise Products Partners
EPD
$82.2B
$34.3M 0.1%
1,105,472
+273,223
+33% +$8.51M
PM icon
170
Philip Morris
PM
$294B
$33.6M 0.09%
184,704
-6,705
-4% -$1.15M
NOVT icon
171
Novanta
NOVT
$6.17B
$33.4M 0.09%
259,358
-178,553
-41% -$21.7M
AMD icon
172
Advanced Micro Devices
AMD
$797B
$33.2M 0.09%
233,670
-33,439
-13% -$3.64M
DT icon
173
Dynatrace
DT
$14.2B
$32.8M 0.09%
593,967
+37,488
+7% +$1.88M
GNRC icon
174
Generac Holdings
GNRC
$12.7B
$32.4M 0.09%
225,968
-253,597
-53% -$30.9M
IRM icon
175
Iron Mountain
IRM
$36.6B
$32.2M 0.09%
314,130
-16,408
-5% -$1.55M
5 6
7
8 9

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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.