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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
CSX icon
476
CSX Corp
CSX
$93.1B
$5.3M 0.01%
162,277
-8,251
-5% -$248K
OKTA icon
477
Okta
OKTA
$25.8B
$5.29M 0.01%
52,951
-9,864
-16% -$1.05M
IBN icon
478
ICICI Bank
IBN
$108B
$5.28M 0.01%
157,024
+160
+0.1% +$5.29K
HEFA icon
479
iShares Currency Hedged MSCI EAFE ETF
HEFA
$7.71B
$5.27M 0.01%
138,720
+23,342
+20% +$853K
URI icon
480
United Rentals
URI
$72.4B
$5.25M 0.01%
6,975
-216
-3% -$144K
TRGP icon
481
Targa Resources
TRGP
$55.1B
$5.24M 0.01%
30,073
-34,336
-53% -$5.77M
VLO icon
482
Valero Energy
VLO
$85.9B
$5.21M 0.01%
38,787
-959
-2% -$120K
YUM icon
483
Yum! Brands
YUM
$41.1B
$5.21M 0.01%
35,148
-27
-0.1% -$3.94K
CORZ icon
484
Core Scientific
CORZ
$6.75B
$5.21M 0.01%
304,928
+24,053
+9% +$241K
TENB icon
485
Tenable Holdings
TENB
$4.01B
$5.19M 0.01%
153,710
-16,276
-10% -$528K
AXSM icon
486
Axsome Therapeutics
AXSM
$10.9B
$5.17M 0.01%
49,482
-3,047
-6% -$323K
GTLB icon
487
GitLab
GTLB
$6.58B
$5.13M 0.01%
113,745
+56,769
+100% +$2.6M
SHY icon
488
iShares 1-3 Year Treasury Bond ETF
SHY
$25.1B
$5.11M 0.01%
61,664
+776
+1% +$64.1K
SYM icon
489
Symbotic
SYM
$5.22B
$5.1M 0.01%
131,319
-4,479
-3% -$117K
TECH icon
490
Bio-Techne
TECH
$11.3B
$5.09M 0.01%
98,866
-3,129
-3% -$157K
VOOV icon
491
Vanguard S&P 500 Value ETF
VOOV
$6.71B
$5.09M 0.01%
26,950
+5,882
+28% +$1.06M
VIS icon
492
Vanguard Industrials ETF
VIS
$8.39B
$5.05M 0.01%
18,024
-205
-1% -$52.9K
EVH icon
493
Evolent Health
EVH
$447M
$5M 0.01%
444,274
-180,366
-29% -$1.66M
WSC icon
494
WillScot Mobile Mini Holdings
WSC
$4.41B
$4.99M 0.01%
182,238
-2,212
-1% -$58.9K
AEP icon
495
American Electric Power
AEP
$68.4B
$4.94M 0.01%
47,628
+8,641
+22% +$899K
CACC icon
496
Credit Acceptance
CACC
$6.08B
$4.92M 0.01%
9,660
-69
-0.7% -$33.9K
QUAL icon
497
iShares MSCI USA Quality Factor ETF
QUAL
$47.9B
$4.92M 0.01%
26,902
+4,187
+18% +$723K
GKOS icon
498
Glaukos
GKOS
$10.6B
$4.88M 0.01%
47,250
+518
+1% +$48.6K
BL icon
499
BlackLine
BL
$1.72B
$4.87M 0.01%
85,984
+710
+0.8% +$36.7K
WELL icon
500
Welltower
WELL
$171B
$4.86M 0.01%
31,603
+555
+2% +$82.9K
18 19
20
21 22

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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.