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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
DSX icon
1576
Diana Shipping
DSX
$296M
$85.5K ﹤0.01%
50,863
+261
+0.5% +$432
LPL icon
1577
LG Display
LPL
$3.46B
$85.2K ﹤0.01%
+16,315
New +$67.8K
EWZ icon
1578
iShares MSCI Brazil ETF
EWZ
$8.57B
$85.1K ﹤0.01%
2,744
+26
+1% +$744
BOND icon
1579
PIMCO Active Bond Exchange-Traded Fund
BOND
$8.47B
$84.6K ﹤0.01%
906
– –
IEO icon
1580
iShares US Oil & Gas Exploration & Production ETF
IEO
$587M
$84.4K ﹤0.01%
911
-3
-0.3% -$272
RSPE icon
1581
Invesco ESG S&P 500 Equal Weight ETF
RSPE
$69.9M
$84.3K ﹤0.01%
2,916
+90
+3% +$2.54K
USHY icon
1582
iShares Broad USD High Yield Corporate Bond ETF
USHY
$29.1B
$83.9K ﹤0.01%
2,221
-132
-6% -$4.95K
RSPG icon
1583
Invesco S&P 500 Equal Weight Energy ETF
RSPG
$596M
$83.7K ﹤0.01%
1,052
-298
-22% -$22.9K
QCLN icon
1584
First Trust NASDAQ Clean Edge Green Energy Index Fund
QCLN
$632M
$82.9K ﹤0.01%
1,976
– –
IMTB icon
1585
iShares Core 5-10 Year USD Bond ETF
IMTB
$275M
$82.7K ﹤0.01%
1,870
-58
-3% -$2.53K
EWX icon
1586
State Street SPDR S&P Emerging Markets Small Cap ETF
EWX
$702M
$81.8K ﹤0.01%
1,215
-99
-8% -$6.44K
DEM icon
1587
WisdomTree Emerging Markets High Dividend Fund
DEM
$3.97B
$81.7K ﹤0.01%
1,777
– –
PXH icon
1588
Invesco FTSE RAFI Emerging Markets ETF
PXH
$1.97B
$81.4K ﹤0.01%
3,202
+2,521
+370% +$61.5K
VTHR icon
1589
Vanguard Russell 3000 ETF
VTHR
$4.85B
$80.9K ﹤0.01%
275
-111
-29% -$31.4K
BAB icon
1590
Invesco Taxable Municipal Bond ETF
BAB
$1.01B
$79.3K ﹤0.01%
2,905
– –
IYM icon
1591
iShares US Basic Materials ETF
IYM
$1.02B
$78.2K ﹤0.01%
528
+469
+795% +$68.5K
LLYVK icon
1592
Liberty Live Group Series C
LLYVK
$9.8B
$77.1K ﹤0.01%
795
– –
SMLF icon
1593
iShares US Small Cap Equity Factor ETF
SMLF
$4.31B
$75.4K ﹤0.01%
1,014
-30
-3% -$2.15K
FPX icon
1594
First Trust US Equity Opportunities ETF
FPX
$1.53B
$73.1K ﹤0.01%
440
– –
EDIV icon
1595
State Street SPDR S&P Emerging Markets Dividend ETF
EDIV
$1.22B
$73.1K ﹤0.01%
1,881
+3
+0.2% +$116
OABI icon
1596
OmniAb
OABI
$497M
$72.3K ﹤0.01%
45,171
– –
FBT icon
1597
First Trust NYSE Arca Biotechnology Index Fund
FBT
$2.81B
$71.4K ﹤0.01%
398
+73
+22% +$12.4K
PBE icon
1598
Invesco Biotechnology & Genome ETF
PBE
$358M
$69.9K ﹤0.01%
1,000
+600
+150% +$40.5K
EWJV icon
1599
iShares MSCI Japan Value ETF
EWJV
$754M
$68.3K ﹤0.01%
1,750
– –
PTON icon
1600
Peloton Interactive
PTON
$2.38B
$68K ﹤0.01%
7,558
-15,820
-68% -$118K
62 63
64
65 66

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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.