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William Blair & Company

William Blair & Company Portfolio holdings

AUM $38.4B
1-Year Est. Return 25.71%
This Fund
S&P 500
This Quarter Est. Return
+7.16%
1 Year Est. Return
+25.71%
3 Year Est. Return
+88.7%
5 Year Est. Return
+104.53%
10 Year Est. Return
+665.86%
AUM
$37.6B
AUM Growth
+$1.57B
Cap. Flow
-$160M
Cap. Flow %
-0.43%
Top 10 Hldgs %
26.02%
Holding
1,919
New
98
Increased
697
Reduced
774
Closed
75

Top Buys

Rank Stock Value
1
META icon
Meta Platforms (Facebook)
META
+$76.1M
2
APP icon
Applovin
APP
+$75.3M
3
NOW icon
ServiceNow
NOW
+$66.6M
4
CWAN
Clearwater Analytics
CWAN
+$65.8M
5
FANG icon
Diamondback Energy
FANG
+$30.7M

Top Sells

Rank Stock Value
1
CYBR
CyberArk
CYBR
+$70.7M
2
ADBE icon
Adobe
ADBE
+$61.7M
3
MSFT icon
Microsoft
MSFT
+$45.7M
4
WDAY icon
Workday
WDAY
+$42.6M
5
POOL icon
Pool Corp
POOL
+$41.7M

Sector Composition

Rank Sector Weight
1 Technology 27.36%
2 Financials 13.36%
3 Industrials 12.59%
4 Healthcare 10.97%
5 Consumer Discretionary 7.45%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
AEP icon
501
American Electric Power
AEP
$68B
$5.35M 0.01%
47,579
-49
-0.1% -$5.36K
ADM icon
502
Archer Daniels Midland
ADM
$38.8B
$5.33M 0.01%
89,261
-666
-0.7% -$39K
SU icon
503
Suncor Energy
SU
$76.1B
$5.28M 0.01%
126,313
-1,312
-1% -$52.6K
CIGI icon
504
Colliers International
CIGI
$5.17B
$5.24M 0.01%
33,556
+681
+2% +$105K
CORZ icon
505
Core Scientific
CORZ
$6.52B
$5.23M 0.01%
291,733
-13,195
-4% -$194K
CTVA icon
506
Corteva
CTVA
$50.3B
$5.21M 0.01%
76,997
-3,142
-4% -$228K
MEC icon
507
Mayville Engineering Co
MEC
$603M
$5.19M 0.01%
377,210
+3,762
+1% +$56.6K
CIBR icon
508
First Trust NASDAQ Cybersecurity ETF
CIBR
$15.7B
$5.17M 0.01%
68,068
+4,098
+6% +$303K
QUAL icon
509
iShares MSCI USA Quality Factor ETF
QUAL
$48.2B
$5.09M 0.01%
26,191
-711
-3% -$133K
SHY icon
510
iShares 1-3 Year Treasury Bond ETF
SHY
$25.5B
$5.06M 0.01%
61,038
-626
-1% -$51.8K
OKTA icon
511
Okta
OKTA
$26B
$4.97M 0.01%
54,221
+1,270
+2% +$119K
COP icon
512
ConocoPhillips
COP
$150B
$4.95M 0.01%
52,317
-185
-0.4% -$17.5K
CP icon
513
Canadian Pacific Kansas City
CP
$82.3B
$4.95M 0.01%
66,415
-16,415
-20% -$1.25M
IJAN icon
514
Innovator International Developed Power Buffer ETF January
IJAN
$264M
$4.93M 0.01%
140,173
-647
-0.5% -$22.4K
RGLD icon
515
Royal Gold
RGLD
$19.3B
$4.92M 0.01%
24,539
+88
+0.4% +$15.2K
YUM icon
516
Yum! Brands
YUM
$41.6B
$4.91M 0.01%
32,274
-2,874
-8% -$423K
GXO icon
517
GXO Logistics
GXO
$5.54B
$4.86M 0.01%
91,833
-3,518
-4% -$181K
IDV icon
518
iShares International Select Dividend ETF
IDV
$8.53B
$4.85M 0.01%
132,744
+6,279
+5% +$226K
XLI icon
519
State Street Industrial Select Sector SPDR ETF
XLI
$34.6B
$4.85M 0.01%
31,422
+591
+2% +$89.5K
III icon
520
Information Services Group
III
$242M
$4.84M 0.01%
842,199
-34,101
-4% -$170K
IBN icon
521
ICICI Bank
IBN
$106B
$4.83M 0.01%
159,875
+2,851
+2% +$93.1K
JEPQ icon
522
JPMorgan Nasdaq Equity Premium Income ETF
JEPQ
$41.8B
$4.83M 0.01%
84,023
-20,412
-20% -$1.13M
TTE icon
523
TotalEnergies
TTE
$193B
$4.82M 0.01%
80,692
+5,465
+7% +$337K
KJAN icon
524
Innovator US Small Cap Power Buffer ETF January
KJAN
$328M
$4.78M 0.01%
118,505
-231
-0.2% -$8.99K
CVS icon
525
CVS Health
CVS
$122B
$4.78M 0.01%
63,409
+1,357
+2% +$93K
19 20
21
22 23

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William Blair & Company's Q3 2025 Portfolio in Review

As of Q3 2025, William Blair & Company held 1,919 positions worth $37.6B, up 4.4% from $36B the previous quarter. Its ten largest holdings account for 26% of the portfolio.

William Blair & Company's Q3 2025 filing shows 98 new, 697 increased, 774 reduced and 75 closed positions. Its largest new stake was Miami International Holdings: 363,765 shares worth $14.6M. The largest sale was CyberArk, an estimated $70.7M.

By sector, the portfolio is most concentrated in Technology at 27% of assets, down from 27% a quarter earlier, followed by Financials and Industrials.

  • William Blair & Company's largest Q3 2025 buy was Miami International Holdings: 363,765 shares worth $14.6M.
  • William Blair & Company added most to Meta Platforms (Facebook) in Q3 2025, an estimated $76.1M increase.
  • William Blair & Company's biggest Q3 2025 reduction was CyberArk, cutting an estimated $70.7M.
  • William Blair & Company fully exited Stride in Q3 2025, selling an estimated $7.47M.
  • William Blair & Company's ten largest holdings make up 26% of its $37.6B portfolio in Q3 2025.
  • William Blair & Company opened 98 new positions and closed 75 in Q3 2025.
  • William Blair & Company's portfolio value rose 4.4% quarter-over-quarter to $37.6B.

Based on William Blair & Company's 13F filing for Q3 2025, filed 12 Nov 2025.