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
DXCM icon
51
DexCom
DXCM
$31.2B
$193M 0.54%
2,208,044
-30,519
-1% -$2.39M
RYAN icon
52
Ryan Specialty Holdings
RYAN
$5.83B
$191M 0.53%
2,814,195
+29,279
+1% +$2.02M
P
53
Everpure Inc
P
$27.8B
$180M 0.5%
3,124,542
-416,903
-12% -$20.7M
CRM icon
54
Salesforce
CRM
$158B
$179M 0.5%
655,587
-24,592
-4% -$6.57M
ACN icon
55
Accenture
ACN
$104B
$176M 0.49%
587,570
-133,923
-19% -$40.8M
VOO icon
56
Vanguard S&P 500 ETF
VOO
$1.01T
$173M 0.48%
303,780
+12,469
+4% +$6.55M
AMT icon
57
American Tower
AMT
$78.3B
$171M 0.47%
773,174
-4,015
-0.5% -$867K
VEA icon
58
Vanguard FTSE Developed Markets ETF
VEA
$234B
$169M 0.47%
2,956,837
-14,416
-0.5% -$772K
AAON icon
59
Aaon
AAON
$7.63B
$168M 0.47%
2,280,070
+102,382
+5% +$8.97M
PG icon
60
Procter & Gamble
PG
$342B
$156M 0.43%
980,263
-9,917
-1% -$1.62M
QQQ icon
61
Invesco QQQ Trust
QQQ
$480B
$149M 0.41%
270,387
+13,795
+5% +$6.86M
VTV icon
62
Vanguard Morningstar Value ETF
VTV
$191B
$146M 0.4%
823,862
+58,110
+8% +$9.82M
JNJ icon
63
Johnson & Johnson
JNJ
$621B
$146M 0.4%
952,857
-4,804
-0.5% -$738K
BWXT icon
64
BWX Technologies
BWXT
$15.4B
$145M 0.4%
1,003,607
+220,616
+28% +$25.8M
IBM icon
65
IBM
IBM
$222B
$140M 0.39%
475,623
+14,771
+3% +$3.81M
VEU icon
66
Vanguard FTSE All-World ex-US ETF
VEU
$68B
$138M 0.38%
2,055,577
+54,001
+3% +$3.42M
BA icon
67
Boeing
BA
$190B
$138M 0.38%
658,055
+180,247
+38% +$34M
VIG icon
68
Vanguard Dividend Appreciation ETF
VIG
$114B
$130M 0.36%
635,523
-6,358
-1% -$1.23M
CMG icon
69
Chipotle Mexican Grill
CMG
$43.7B
$130M 0.36%
2,311,580
-135,016
-6% -$6.87M
AME icon
70
Ametek
AME
$58.4B
$125M 0.35%
689,860
-15,277
-2% -$2.63M
ROL icon
71
Rollins
ROL
$18.1B
$122M 0.34%
2,170,212
-2,871
-0.1% -$161K
POOL icon
72
Pool Corp
POOL
$7.51B
$119M 0.33%
409,738
-107,711
-21% -$32.6M
VRSK icon
73
Verisk Analytics
VRSK
$24.6B
$119M 0.33%
383,297
-301
-0.1% -$91.3K
ANET icon
74
Arista Networks
ANET
$248B
$118M 0.33%
1,157,382
+125,362
+12% +$10.8M
UNP icon
75
Union Pacific
UNP
$176B
$115M 0.32%
497,859
-19,538
-4% -$4.34M
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.