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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
DBC icon
1001
Invesco DB Commodity Index Tracking Fund
DBC
$1.71B
$723K ﹤0.01%
32,078
+7,000
+28% +$156K
GSK icon
1002
GSK
GSK
$101B
$722K ﹤0.01%
16,720
+3,976
+31% +$155K
REGN icon
1003
Regeneron Pharmaceuticals
REGN
$83B
$714K ﹤0.01%
1,269
+12
+1% +$6.79K
MUFG icon
1004
Mitsubishi UFJ Financial
MUFG
$260B
$713K ﹤0.01%
44,742
-861
-2% -$12.7K
ELAN icon
1005
Elanco Animal Health
ELAN
$11.2B
$706K ﹤0.01%
35,075
+15,005
+75% +$251K
ETON icon
1006
Eton Pharmaceutcials
ETON
$1.12B
$704K ﹤0.01%
32,400
– –
NRG icon
1007
NRG Energy
NRG
$25.2B
$702K ﹤0.01%
4,332
+175
+4% +$27.3K
PNQI icon
1008
Invesco NASDAQ Internet ETF
PNQI
$544M
$700K ﹤0.01%
12,545
+2,500
+25% +$134K
AIZ icon
1009
Assurant
AIZ
$13.9B
$699K ﹤0.01%
3,226
-425
-12% -$86.2K
NU icon
1010
Nu Holdings
NU
$67.3B
$697K ﹤0.01%
43,533
+16,228
+59% +$226K
DG icon
1011
Dollar General
DG
$26.9B
$696K ﹤0.01%
6,731
+1,066
+19% +$117K
PSA icon
1012
Public Storage
PSA
$61.4B
$695K ﹤0.01%
2,406
-457
-16% -$131K
HDB icon
1013
HDFC Bank
HDB
$119B
$691K ﹤0.01%
20,223
+3,785
+23% +$140K
EME icon
1014
Emcor
EME
$36.7B
$685K ﹤0.01%
1,055
-64
-6% -$38.8K
BBAX icon
1015
JPMorgan BetaBuilders Developed Asia Pacific-ex Japan ETF
BBAX
$6.78B
$683K ﹤0.01%
12,116
+4,212
+53% +$236K
XT icon
1016
iShares Future Exponential Technologies ETF
XT
$4.01B
$680K ﹤0.01%
9,452
– –
IGM icon
1017
iShares Expanded Tech Sector ETF
IGM
$10.9B
$678K ﹤0.01%
5,387
– –
ALRM icon
1018
Alarm.com
ALRM
$2.74B
$677K ﹤0.01%
12,762
– –
LAMR icon
1019
Lamar Advertising Co
LAMR
$15.8B
$676K ﹤0.01%
5,520
+162
+3% +$20.1K
RVTY icon
1020
Revvity
RVTY
$13.1B
$675K ﹤0.01%
7,701
+1,423
+23% +$129K
NJAN icon
1021
Innovator Growth-100 Power Buffer ETF January
NJAN
$356M
$674K ﹤0.01%
12,667
-2,350
-16% -$122K
IONQ icon
1022
IonQ
IONQ
$18.2B
$673K ﹤0.01%
10,945
+2,520
+30% +$118K
JHMM icon
1023
John Hancock Multifactor Mid Cap ETF
JHMM
$6.18B
$669K ﹤0.01%
10,348
+83
+0.8% +$5.25K
R icon
1024
Ryder
R
$10.1B
$667K ﹤0.01%
3,535
+207
+6% +$37.3K
XYLD icon
1025
Global X S&P 500 Covered Call ETF
XYLD
$3.28B
$667K ﹤0.01%
16,984
+57
+0.3% +$2.23K
39 40
41
42 43

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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.