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
IYE icon
1451
iShares US Energy ETF
IYE
$1.71B
$162K ﹤0.01%
3,581
-1,096
-23% -$48.4K
RPV icon
1452
Invesco S&P 500 Pure Value ETF
RPV
$1.68B
$160K ﹤0.01%
1,706
-240
-12% -$21.6K
TAK icon
1453
Takeda Pharmaceutical
TAK
$55.7B
$159K ﹤0.01%
10,306
-317
-3% -$4.68K
KSS icon
1454
Kohl's
KSS
$2.19B
$159K ﹤0.01%
18,777
-3,327
-15% -$25.6K
VMD icon
1455
Viemed Healthcare
VMD
$371M
$159K ﹤0.01%
23,000
– –
GMF icon
1456
State Street SPDR S&P Emerging Asia Pacific ETF
GMF
$438M
$159K ﹤0.01%
1,255
– –
VRP icon
1457
Invesco Variable Rate Preferred ETF
VRP
$3.01B
$159K ﹤0.01%
6,485
– –
BCSF icon
1458
Bain Capital Specialty
BCSF
$850M
$155K ﹤0.01%
10,339
– –
EZU icon
1459
iShare MSCI Eurozone ETF
EZU
$9.91B
$153K ﹤0.01%
2,581
-580
-18% -$32.8K
ZAP
1460
Global X U.S. Electrification ETF
ZAP
$464M
$153K ﹤0.01%
+5,687
New +$144K
SPTS icon
1461
State Street SPDR Portfolio Short Term Treasury ETF
SPTS
$6.11B
$153K ﹤0.01%
5,225
-1,131
-18% -$33K
EWG icon
1462
iShares MSCI Germany ETF
EWG
$1.62B
$151K ﹤0.01%
3,572
+2,600
+267% +$104K
FXI icon
1463
iShares China Large-Cap ETF
FXI
$4.31B
$149K ﹤0.01%
4,056
-245
-6% -$8.58K
NEPH icon
1464
Nephros
NEPH
$45.7M
$148K ﹤0.01%
36,249
– –
MKC.V icon
1465
McCormick & Company Voting
MKC.V
$14.2B
$145K ﹤0.01%
1,921
– –
DBEU icon
1466
Xtrackers MSCI Europe Hedged Equity ETF
DBEU
$786M
$145K ﹤0.01%
3,290
+3
+0.1% +$132
VTRS icon
1467
Viatris
VTRS
$18.9B
$144K ﹤0.01%
16,162
+3,195
+25% +$27K
DFTX
1468
Definium Therapeutics
DFTX
$6.12B
$144K ﹤0.01%
22,218
+9,718
+78% +$63.9K
CLOV icon
1469
Clover Health Investments
CLOV
$2.51B
$144K ﹤0.01%
51,500
+25,000
+94% +$82.2K
SPTM icon
1470
State Street SPDR Portfolio S&P 1500 Composite Stock Market ETF
SPTM
$14B
$143K ﹤0.01%
1,913
-203
-10% -$14.1K
UPRO icon
1471
ProShares UltraPro S&P 500
UPRO
$5.7B
$139K ﹤0.01%
1,522
– –
SPTL icon
1472
State Street SPDR Portfolio Long Term Treasury ETF
SPTL
$10.6B
$138K ﹤0.01%
5,188
-220
-4% -$5.77K
IYY icon
1473
iShares Dow Jones US ETF
IYY
$3.06B
$137K ﹤0.01%
910
– –
JMIA
1474
Jumia Technologies
JMIA
$767M
$135K ﹤0.01%
33,700
– –
REAX icon
1475
Real Brokerage
REAX
$466M
$135K ﹤0.01%
30,000
– –
57 58
59
60 61

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
First Manhattan
First Manhattan New York $36.1B AUM 11.5% 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.