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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
HEZU icon
1801
iShares Currency Hedged MSCI Eurozone ETF
HEZU
$590M
$3.33K ﹤0.01%
79
– –
BWX icon
1802
State Street SPDR Bloomberg International Treasury Bond ETF
BWX
$1.31B
$3.29K ﹤0.01%
143
-816
-85% -$18.8K
LBRDA icon
1803
Liberty Broadband Class A
LBRDA
$5.07B
$3.23K ﹤0.01%
51
+7
+16% +$487
PEZ icon
1804
Invesco Dorsey Wright Consumer Cyclicals Momentum ETF
PEZ
$22.5M
$3.12K ﹤0.01%
31
– –
XRLV
1805
DELISTED
Invesco S&P 500 ex-Rate Sensitive Low Volatility ETF
XRLV
$3.06K ﹤0.01%
55
– –
EWP icon
1806
iShares MSCI Spain ETF
EWP
$2.22B
$2.67K ﹤0.01%
54
– –
NORW icon
1807
Global X MSCI Norway ETF
NORW
$87.7M
$2.63K ﹤0.01%
87
– –
MILN
1808
Global X Millennial Consumer ETF
MILN
$102M
$2.47K ﹤0.01%
50
– –
ISCV icon
1809
iShares Morningstar Small-Cap Value ETF
ISCV
$706M
$2.33K ﹤0.01%
35
-10
-22% -$649
DRLL icon
1810
Strive US Energy ETF
DRLL
$302M
$2.3K ﹤0.01%
+80
New +$2.26K
IYT icon
1811
iShares US Transportation ETF
IYT
$2.27B
$2.29K ﹤0.01%
32
– –
EDEN icon
1812
iShares MSCI Denmark ETF
EDEN
$206M
$2.29K ﹤0.01%
21
-54
-72% -$5.98K
SEATW icon
1813
Vivid Seats Inc Warrant
SEATW
$499K
$2.29K ﹤0.01%
22,000
– –
USDU icon
1814
WisdomTree Bloomberg US Dollar Bullish Fund
USDU
$458M
$2.24K ﹤0.01%
85
– –
PGF icon
1815
Invesco Financial Preferred ETF
PGF
$668M
$2.19K ﹤0.01%
150
– –
CORZZ icon
1816
Core Scientific Inc Tranche 2 Warrants
CORZZ
$1.75B
$2.17K ﹤0.01%
121
– –
PGJ icon
1817
Invesco Golden Dragon China ETF
PGJ
$95.1M
$1.99K ﹤0.01%
60
-50
-45% -$1.53K
IHF icon
1818
iShares US Healthcare Providers ETF
IHF
$1.27B
$1.98K ﹤0.01%
40
-375
-90% -$17.1K
XSLV icon
1819
Invesco S&P SmallCap Low Volatility ETF
XSLV
$249M
$1.95K ﹤0.01%
42
– –
SPTB
1820
State Street SPDR Portfolio Treasury ETF
SPTB
$296M
$1.81K ﹤0.01%
+59
New +$1.79K
EPU icon
1821
iShares MSCI Peru and Global Exposure ETF
EPU
$550M
$1.72K ﹤0.01%
28
– –
XES icon
1822
State Street SPDR S&P Oil & Gas Equipment & Services ETF
XES
$390M
$1.66K ﹤0.01%
23
– –
EWN icon
1823
iShares MSCI Netherlands ETF
EWN
$727M
$1.62K ﹤0.01%
28
-57
-67% -$3.08K
IMCB icon
1824
iShares Morningstar Mid-Cap ETF
IMCB
$1.72B
$1.58K ﹤0.01%
19
– –
EBND icon
1825
State Street SPDR Bloomberg Emerging Markets Local Bond ETF
EBND
$2.27B
$1.53K ﹤0.01%
72
-54
-43% -$1.15K
71 72
73
74 75

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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.