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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
BUFR icon
1851
FT Vest Fund of Buffer ETFs
BUFR
$10.4B
– –
-8,291
Closed -$264K
CCRN
1852
DELISTED
Cross Country Healthcare
CCRN
– –
-67,356
Closed -$879K
CLF icon
1853
Cleveland-Cliffs
CLF
$6.99B
– –
-114,777
Closed -$872K
DFEB icon
1854
FT Vest US Equity Deep Buffer ETF February
DFEB
$463M
– –
-1,426
Closed -$63.7K
DSTL icon
1855
Distillate US Fundamental Stability & Value ETF
DSTL
$2.05B
– –
-82
Closed -$4.52K
DVA icon
1856
DaVita
DVA
$11.6B
– –
-1,464
Closed -$209K
DWX icon
1857
State Street SPDR S&P International Dividend ETF
DWX
$529M
– –
-200
Closed -$8.43K
ECH icon
1858
iShares MSCI Chile ETF
ECH
$1.03B
– –
-93
Closed -$2.92K
ECPG icon
1859
Encore Capital Group
ECPG
$2.07B
– –
-11,637
Closed -$450K
EFNL icon
1860
iShares MSCI Finland ETF
EFNL
$251M
– –
-56
Closed -$2.29K
EIRL icon
1861
iShares MSCI Ireland ETF
EIRL
$78.4M
– –
-96
Closed -$6.44K
ENZL icon
1862
iShares MSCI New Zealand ETF
ENZL
$82.1M
– –
-89
Closed -$4.06K
FLYW icon
1863
Flywire
FLYW
$2.12B
– –
-17,407
Closed -$204K
FNOV icon
1864
FT Vest US Equity Buffer ETF November
FNOV
$1.24B
– –
-750
Closed -$37.6K
FNX icon
1865
First Trust Mid Cap Core AlphaDEX Fund
FNX
$1.41B
– –
-409
Closed -$47K
FXD icon
1866
First Trust Consumer Discretionary AlphaDEX Fund
FXD
$272M
– –
-207
Closed -$13.1K
GCMGW
1867
DELISTED
GCM Grosvenor Inc Warrant
GCMGW
– –
-7,895
Closed -$5.05K
GENI icon
1868
Genius Sports
GENI
$2.12B
– –
-12,550
Closed -$131K
GMS
1869
DELISTED
GMS Inc
GMS
– –
-23,000
Closed -$2.5M
GOAU icon
1870
US Global GO Gold and Precious Metal Miners ETF
GOAU
$200M
– –
-22
Closed -$645
HCAT icon
1871
Health Catalyst
HCAT
$135M
– –
-14,256
Closed -$53.7K
HRL icon
1872
Hormel Foods
HRL
$13.4B
– –
-12,628
Closed -$382K
IBDT icon
1873
iShares iBonds Dec 2028 Term Corporate ETF
IBDT
$4.07B
– –
-1,207
Closed -$30.7K
IBTF
1874
DELISTED
iShares iBonds Dec 2025 Term Treasury ETF
IBTF
– –
-831
Closed -$19.4K
JETS icon
1875
US Global Jets ETF
JETS
$825M
– –
-1,991
Closed -$45.7K
73 74
75
76 77

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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.