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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
GSUS icon
1626
Goldman Sachs MarketBeta US Equity ETF
GSUS
$3.3B
$55.4K ﹤0.01%
600
– –
PWV icon
1627
Invesco Large Cap Value ETF
PWV
$1.78B
$55.4K ﹤0.01%
850
-475
-36% -$30.1K
SPTS icon
1628
State Street SPDR Portfolio Short Term Treasury ETF
SPTS
$6.11B
$55.2K ﹤0.01%
1,883
-3,342
-64% -$97.7K
BNKK
1629
Bonk Inc
BNKK
$7.77M
$55.1K ﹤0.01%
+5,871
New +$107K
WOMN icon
1630
Impact Shares Womens Empowerment ETF Trading
WOMN
$59.1M
$54.9K ﹤0.01%
1,351
+1
+0.1% +$40
PFFD icon
1631
Global X US Preferred ETF
PFFD
$2.17B
$53K ﹤0.01%
2,730
+2
+0.1% +$39
FV icon
1632
First Trust Dorsey Wright Focus 5 ETF
FV
$3.8B
$53K ﹤0.01%
856
-1,057
-55% -$64.4K
UA icon
1633
Under Armour Class C
UA
$2.2B
$51.3K ﹤0.01%
10,631
+500
+5% +$2.8K
EQAL icon
1634
Invesco Russell 1000 Equal Weight ETF
EQAL
$844M
$51.1K ﹤0.01%
982
– –
JHML icon
1635
John Hancock Multifactor Large Cap ETF
JHML
$1.2B
$50.9K ﹤0.01%
650
-557
-46% -$42.2K
AWRE icon
1636
Aware
AWRE
$26M
$50.5K ﹤0.01%
20,964
– –
IVOO icon
1637
Vanguard S&P Mid-Cap 400 ETF
IVOO
$3.93B
$50.3K ﹤0.01%
456
+205
+82% +$22.3K
IAI icon
1638
iShares US Broker-Dealers & Securities Exchanges ETF
IAI
$1.37B
$50.2K ﹤0.01%
284
-64
-18% -$11.1K
KCE icon
1639
State Street SPDR S&P Capital Markets ETF
KCE
$473M
$50K ﹤0.01%
327
-72
-18% -$11K
RSPM icon
1640
Invesco S&P 500 Equal Weight Materials ETF
RSPM
$184M
$49.5K ﹤0.01%
1,510
– –
NMTC icon
1641
NeuroOne Medical Technologies
NMTC
$13.2M
$49.4K ﹤0.01%
9,259
– –
FDD icon
1642
First Trust STOXX European Select Dividend Income Fund
FDD
$909M
$48.5K ﹤0.01%
3,000
– –
DVYE icon
1643
iShares Emerging Markets Dividend ETF
DVYE
$1.21B
$48.2K ﹤0.01%
1,625
– –
MODD icon
1644
Modular Medical
MODD
$11.2M
$47.3K ﹤0.01%
2,253
-400
-15% -$8.62K
HLLY icon
1645
Holley
HLLY
$384M
$47.3K ﹤0.01%
15,050
-6,850
-31% -$20.4K
GCTS
1646
GCT Semiconductor Holding
GCTS
$200M
$46.9K ﹤0.01%
+30,854
New +$44K
JNK icon
1647
State Street SPDR Bloomberg High Yield Bond ETF
JNK
$7.31B
$46K ﹤0.01%
470
-684
-59% -$66.4K
EQWL icon
1648
Invesco S&P 100 Equal Weight ETF
EQWL
$2.79B
$45.9K ﹤0.01%
400
– –
LIT icon
1649
Global X Lithium & Battery Tech ETF
LIT
$1.61B
$44.7K ﹤0.01%
787
+100
+15% +$4.6K
VTGN icon
1650
VistaGen Therapeutics
VTGN
$11.6M
$44.6K ﹤0.01%
12,573
-73,293
-85% -$219K
64 65
66
67 68

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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.