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
+512.03%
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
GWRE icon
26
Guidewire Software
GWRE
$13.3B
$277M 0.77%
1,174,625
-5,253
-0.4% -$1.13M
DHR icon
27
Danaher
DHR
$137B
$272M 0.75%
1,375,724
-68,056
-5% -$13.2M
IVV icon
28
iShares Core S&P 500 ETF
IVV
$900B
$271M 0.75%
436,143
+18,914
+5% +$10.9M
TDG icon
29
TransDigm Group
TDG
$71.3B
$263M 0.73%
172,953
-2,268
-1% -$3.19M
AVGO icon
30
Broadcom
AVGO
$1.99T
$258M 0.72%
934,447
+69,027
+8% +$15M
WDAY icon
31
Workday
WDAY
$42.3B
$256M 0.71%
1,067,119
-43,471
-4% -$10.6M
ZTS icon
32
Zoetis
ZTS
$31.9B
$254M 0.71%
1,631,871
-260,409
-14% -$41.3M
ISRG icon
33
Intuitive Surgical
ISRG
$130B
$253M 0.7%
466,023
-7,393
-2% -$3.87M
TYL icon
34
Tyler Technologies
TYL
$12.8B
$252M 0.7%
424,768
+3,894
+0.9% +$2.21M
CPRT icon
35
Copart
CPRT
$27.2B
$249M 0.69%
5,082,291
-70,297
-1% -$3.93M
WMT icon
36
Walmart Inc
WMT
$888B
$238M 0.66%
2,435,014
-9,471
-0.4% -$902K
LLY icon
37
Eli Lilly
LLY
$995B
$237M 0.66%
304,467
-27,354
-8% -$21.3M
PANW icon
38
Palo Alto Networks
PANW
$299B
$237M 0.66%
1,157,886
-20,762
-2% -$3.86M
ABBV icon
39
AbbVie
ABBV
$431B
$233M 0.65%
1,257,412
+14,307
+1% +$2.66M
CSGP icon
40
CoStar Group
CSGP
$12.1B
$231M 0.64%
2,871,162
-32,356
-1% -$2.52M
CTAS icon
41
Cintas
CTAS
$81.5B
$226M 0.63%
1,014,575
+15,972
+2% +$3.44M
ADBE icon
42
Adobe
ADBE
$102B
$219M 0.61%
565,371
-38,554
-6% -$14.9M
ABT icon
43
Abbott
ABT
$182B
$218M 0.61%
1,603,305
+24,281
+2% +$3.2M
ECL icon
44
Ecolab
ECL
$79.7B
$217M 0.6%
805,156
-8,977
-1% -$2.28M
AXP icon
45
American Express
AXP
$234B
$216M 0.6%
678,570
-10,978
-2% -$3.09M
BRK.B icon
46
Berkshire Hathaway Class B
BRK.B
$1.12T
$215M 0.6%
442,597
+21,843
+5% +$11.1M
BX icon
47
Blackstone
BX
$110B
$203M 0.56%
1,355,932
+10,013
+0.7% +$1.38M
AON icon
48
Aon
AON
$75.7B
$203M 0.56%
567,987
+13,237
+2% +$4.8M
NFLX icon
49
Netflix
NFLX
$306B
$201M 0.56%
1,502,550
+128,240
+9% +$14.5M
INTU icon
50
Intuit
INTU
$88.5B
$201M 0.56%
255,338
-367
-0.1% -$248K
1
2
3 4 5

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.