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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
PAMC icon
1826
Pacer Lunt MidCap Multi-Factor Alternator ETF
PAMC
$54.7M
$1.18K ﹤0.01%
25
– –
SRVR icon
1827
Pacer Data & Infrastructure Real Estate ETF
SRVR
$386M
$1.17K ﹤0.01%
37
+3
+9% +$95
SMRI icon
1828
Bushido Capital US Equity ETF
SMRI
$682M
$1.04K ﹤0.01%
+30
New +$1K
DXUV
1829
Dimensional US Vector Equity ETF
DXUV
$567M
$993 ﹤0.01%
+17
New +$964
VFVA icon
1830
Vanguard US Value Factor ETF
VFVA
$933M
$893 ﹤0.01%
7
– –
QQQS icon
1831
Invesco NASDAQ Future Gen 200 ETF
QQQS
$22.8M
$836 ﹤0.01%
25
– –
GDE icon
1832
WisdomTree Efficient Gold Plus Equity Strategy Fund
GDE
$483M
$574 ﹤0.01%
10
– –
PSI icon
1833
Invesco Semiconductors ETF
PSI
$2.58B
$563 ﹤0.01%
8
– –
IEZ icon
1834
iShares US Oil Equipment & Services ETF
IEZ
$385M
$444 ﹤0.01%
23
– –
CHIQ icon
1835
Global X MSCI China Consumer Discretionary ETF
CHIQ
$123M
$387 ﹤0.01%
16
– –
PSR icon
1836
Invesco Active US Real Estate Fund
PSR
$59.2M
$371 ﹤0.01%
4
– –
DXD icon
1837
ProShares UltraShort Dow 30
DXD
$42.7M
$264 ﹤0.01%
+12
New +$281
ISPOW
1838
DELISTED
Inspirato Inc Warrant
ISPOW
$186 ﹤0.01%
15,000
– –
PIIIW icon
1839
P3 Health Partners Inc Warrant
PIIIW
$199K
$80 ﹤0.01%
8,598
+833
+11% +$9
SRS icon
1840
ProShares UltraShort Real Estate
SRS
$16.1M
$46 ﹤0.01%
1
– –
AESI icon
1841
Atlas Energy Solutions
AESI
$1.47B
– –
-76,246
Closed -$1.02M
AGL icon
1842
Agilon Health
AGL
$1.45B
– –
-6,256
Closed -$360K
ALLY icon
1843
Ally Financial
ALLY
$13.5B
– –
-8,153
Closed -$318K
AR icon
1844
Antero Resources
AR
$11.5B
– –
-46,587
Closed -$1.88M
ARGT icon
1845
Global X MSCI Argentina ETF
ARGT
$810M
– –
-25
Closed -$2.12K
ARIS
1846
DELISTED
Aris Water Solutions
ARIS
– –
-35,617
Closed -$842K
LONA
1847
LeonaBio Inc
LONA
$73.9M
– –
-2,000
Closed -$6.04K
BALL icon
1848
Ball Corp
BALL
$16.4B
– –
-4,632
Closed -$260K
BDSX icon
1849
Biodesix
BDSX
$256M
– –
-7,055
Closed -$39.8K
BRKL
1850
DELISTED
Brookline Bancorp
BRKL
– –
-31,210
Closed -$329K
72 73
74
75 76

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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.