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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
CCOI icon
326
Cogent Communications
CCOI
$497M
$11.4M 0.03%
236,520
+33,223
+16% +$1.69M
MO icon
327
Altria Group
MO
$114B
$11.3M 0.03%
192,290
+8,940
+5% +$525K
MRSH
328
Marsh
MRSH
$91.5B
$11.2M 0.03%
51,341
+6,580
+15% +$1.49M
BAH icon
329
Booz Allen Hamilton
BAH
$9.15B
$11.1M 0.03%
106,269
-106,067
-50% -$11.9M
IWO icon
330
iShares Russell 2000 Growth ETF
IWO
$15.1B
$11M 0.03%
38,583
+438
+1% +$115K
DUK icon
331
Duke Energy
DUK
$97.3B
$11M 0.03%
93,445
+2,257
+2% +$266K
NSC icon
332
Norfolk Southern
NSC
$75.1B
$10.8M 0.03%
41,999
+1,006
+2% +$237K
GEHC icon
333
GE HealthCare
GEHC
$32.4B
$10.7M 0.03%
145,121
+37,611
+35% +$2.62M
MELI icon
334
Mercado Libre
MELI
$92.3B
$10.5M 0.03%
4,017
+24
+0.6% +$56K
ASML icon
335
ASML
ASML
$669B
$10.5M 0.03%
13,076
+3,060
+31% +$2.2M
EFV icon
336
iShares MSCI EAFE Value ETF
EFV
$29.4B
$10.5M 0.03%
164,964
+37,824
+30% +$2.31M
MGK icon
337
Vanguard Morningstar Mega Cap Growth ETF
MGK
$34.2B
$10.5M 0.03%
142,860
+9,010
+7% +$594K
CGGR icon
338
Capital Group Growth ETF
CGGR
$25.3B
$10.4M 0.03%
256,014
+41,213
+19% +$1.5M
ET icon
339
Energy Transfer Partners
ET
$69.3B
$10.4M 0.03%
572,420
+468
+0.1% +$8.17K
KRNT icon
340
Kornit Digital
KRNT
$791M
$10.3M 0.03%
519,574
+84,593
+19% +$1.69M
KR icon
341
Kroger
KR
$34.8B
$10.3M 0.03%
144,143
-7,116
-5% -$491K
TT icon
342
Trane Technologies
TT
$106B
$10.3M 0.03%
23,529
+1,299
+6% +$512K
TEAM icon
343
Atlassian
TEAM
$37.8B
$10.3M 0.03%
50,603
-3,717
-7% -$774K
BABA icon
344
Alibaba
BABA
$308B
$10.2M 0.03%
89,987
-3,230
-3% -$382K
VPU
345
Vanguard Utilities ETF
VPU
$8.36B
$10.2M 0.03%
57,525
+15,564
+37% +$2.68M
STKL
346
DELISTED
SunOpta
STKL
$10.1M 0.03%
1,741,932
+55,763
+3% +$293K
VBR icon
347
Vanguard Morningstar Small-Cap Value ETF
VBR
$37.9B
$10.1M 0.03%
51,558
-3,616
-7% -$669K
PAPR icon
348
Innovator US Equity Power Buffer ETF April
PAPR
$961M
$9.85M 0.03%
264,240
+159,063
+151% +$5.71M
SDY icon
349
State Street SPDR S&P Dividend ETF
SDY
$23.9B
$9.81M 0.03%
72,284
+62
+0.1% +$8.22K
WPM icon
350
Wheaton Precious Metals
WPM
$60.9B
$9.76M 0.03%
108,670
+2,528
+2% +$213K
12 13
14
15 16

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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.