We are live on ! Find out more
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
RMD icon
126
ResMed
RMD
$32.4B
$61M 0.17%
236,284
-5,713
-2% -$1.36M
GWW icon
127
W.W. Grainger
GWW
$60.4B
$58.5M 0.16%
56,282
+1,822
+3% +$1.89M
SHOP icon
128
Shopify
SHOP
$191B
$57.8M 0.16%
500,680
+4,852
+1% +$485K
IEFA icon
129
iShares Core MSCI EAFE ETF
IEFA
$194B
$56M 0.16%
670,251
+35,972
+6% +$2.85M
CSCO icon
130
Cisco
CSCO
$476B
$55.9M 0.16%
806,310
+40,585
+5% +$2.49M
JLL icon
131
Jones Lang LaSalle
JLL
$16.7B
$55.9M 0.16%
218,647
+812
+0.4% +$186K
TMO icon
132
Thermo Fisher Scientific
TMO
$214B
$55M 0.15%
135,555
-5,255
-4% -$2.2M
ULS icon
133
UL Solutions
ULS
$15.5B
$54.5M 0.15%
748,571
+14,690
+2% +$962K
APP icon
134
Applovin
APP
$113B
$53.6M 0.15%
153,178
+56,582
+59% +$18.3M
DIS icon
135
Walt Disney
DIS
$182B
$53.3M 0.15%
429,619
-59,935
-12% -$6.23M
RTX icon
136
RTX Corp
RTX
$301B
$52.7M 0.15%
360,823
+9,211
+3% +$1.23M
NDAQ icon
137
Nasdaq
NDAQ
$52.9B
$52.1M 0.14%
582,098
+41,054
+8% +$3.28M
BAC icon
138
Bank of America
BAC
$441B
$51.9M 0.14%
1,097,720
-95,251
-8% -$4.01M
PODD icon
139
Insulet
PODD
$9.65B
$51.4M 0.14%
163,555
-13,724
-8% -$3.96M
BRK.A icon
140
Berkshire Hathaway Class A
BRK.A
$1.13T
$51M 0.14%
70
– –
USFR icon
141
WisdomTree Floating Rate Treasury Fund
USFR
$18.4B
$50.8M 0.14%
1,008,963
-7,838
-0.8% -$395K
EMR icon
142
Emerson Electric
EMR
$87.5B
$50.4M 0.14%
377,644
+1,696
+0.5% +$195K
GE icon
143
GE Aerospace
GE
$389B
$49.7M 0.14%
193,128
+2,331
+1% +$511K
MRVL icon
144
Marvell Technology
MRVL
$189B
$46.9M 0.13%
605,579
+2,872
+0.5% +$179K
AMGN icon
145
Amgen
AMGN
$219B
$46.6M 0.13%
166,893
+275
+0.2% +$77.9K
TJX icon
146
TJX Companies
TJX
$179B
$45.8M 0.13%
370,646
+3,490
+1% +$443K
CHWY icon
147
Chewy
CHWY
$9.59B
$45.6M 0.13%
1,069,463
+219,629
+26% +$8.75M
IWD icon
148
iShares Russell 1000 Value ETF
IWD
$83.2B
$45.3M 0.13%
233,392
+13,249
+6% +$2.45M
PFE icon
149
Pfizer
PFE
$149B
$45M 0.13%
1,858,052
-432,146
-19% -$10.1M
SDVY icon
150
First Trust SMID Cap Rising Dividend Achievers ETF
SDVY
$11.8B
$44.6M 0.12%
1,265,220
-5,277
-0.4% -$177K
4 5
6
7 8

Similar funds

SAM
Storebrand Asset Management Lysaker, Norway $34.8B AUM 25.49% 1-Year Est. Return
Chevy Chase Trust
Chevy Chase Trust Bethesda, Maryland $34.7B AUM 29.45% 1-Year Est. Return
VIA
Vanguard Investments Australia Victoria, Australia $34.6B AUM
Alyeska Investment Group
Alyeska Investment Group Chicago, Illinois $35.4B AUM 33.54% 1-Year Est. Return
Pacer Advisors
Pacer Advisors Malvern, Pennsylvania $35.6B AUM 18.19% 1-Year Est. Return
Kayne Anderson Rudnick Investment Management
Kayne Anderson Rudnick Investment Management Los Angeles, California $34B AUM 6.31% 1-Year Est. Return
Viking Global Investors
Viking Global Investors Stamford, Connecticut $35.7B AUM 21.3% 1-Year Est. Return
MML Investors Services
MML Investors Services Springfield, Massachusetts $36.1B AUM 19.68% 1-Year Est. Return

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.