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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
MTZ icon
1326
MasTec
MTZ
$21.9B
$252K ﹤0.01%
+1,478
New +$213K
GNR icon
1327
State Street SPDR S&P Global Natural Resources ETF
GNR
$4.9B
$252K ﹤0.01%
4,641
-422
-8% -$22.1K
LYFT icon
1328
Lyft
LYFT
$6.63B
$251K ﹤0.01%
15,940
-29,303
-65% -$410K
AIT icon
1329
Applied Industrial Technologies
AIT
$13.3B
$250K ﹤0.01%
1,075
-107
-9% -$24.3K
BNDX icon
1330
Vanguard Total International Bond ETF
BNDX
$82.2B
$250K ﹤0.01%
5,046
+96
+2% +$4.72K
JOBY icon
1331
Joby Aviation
JOBY
$8.55B
$250K ﹤0.01%
23,671
-444,977
-95% -$3.22M
FCFS icon
1332
FirstCash
FCFS
$8.78B
$248K ﹤0.01%
+1,838
New +$235K
XBAP icon
1333
Innovator US Equity Accelerated 9 Buffer ETF April
XBAP
$133M
$248K ﹤0.01%
6,757
– –
CM icon
1334
Canadian Imperial Bank of Commerce
CM
$108B
$247K ﹤0.01%
3,493
-124
-3% -$7.98K
ILMN icon
1335
Illumina
ILMN
$28.4B
$247K ﹤0.01%
+2,586
New +$210K
GLTR icon
1336
abrdn Physical Precious Metals Basket Shares ETF
GLTR
$2.67B
$246K ﹤0.01%
+1,784
New +$238K
ICVT icon
1337
iShares Convertible Bond ETF
ICVT
$7.35B
$246K ﹤0.01%
2,729
-59
-2% -$5.06K
TM icon
1338
Toyota
TM
$225B
$246K ﹤0.01%
+1,427
New +$258K
RPRX icon
1339
Royalty Pharma
RPRX
$25.3B
$245K ﹤0.01%
6,801
– –
DLS icon
1340
WisdomTree International SmallCap Dividend Fund
DLS
$1.08B
$244K ﹤0.01%
3,245
+3
+0.1% +$210
IYZ icon
1341
iShares US Telecommunications ETF
IYZ
$1.26B
$243K ﹤0.01%
8,173
-47
-0.6% -$1.29K
SUSC icon
1342
iShares ESG Aware USD Corporate Bond ETF
SUSC
$1.29B
$243K ﹤0.01%
10,468
+41
+0.4% +$935
VOD icon
1343
Vodafone
VOD
$37.4B
$242K ﹤0.01%
22,748
-2,854
-11% -$27.6K
WU icon
1344
Western Union
WU
$2.21B
$241K ﹤0.01%
28,656
+7,564
+36% +$71.9K
CQP icon
1345
Cheniere Energy
CQP
$31.3B
$241K ﹤0.01%
4,300
– –
ICLN icon
1346
iShares Global Clean Energy ETF
ICLN
$2.4B
$240K ﹤0.01%
18,325
-1,089
-6% -$13.4K
FTC icon
1347
First Trust Large Cap Growth AlphaDEX Fund
FTC
$1.38B
$238K ﹤0.01%
1,575
– –
AIVL icon
1348
WisdomTree US AI Enhanced Value Fund
AIVL
$436M
$238K ﹤0.01%
2,103
– –
BHP icon
1349
BHP
BHP
$230B
$238K ﹤0.01%
4,944
-560
-10% -$26.9K
BFLY icon
1350
Butterfly Network
BFLY
$2.35B
$237K ﹤0.01%
118,500
+15,000
+14% +$34.4K
52 53
54
55 56

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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.