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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
LB
1076
LandBridge Co
LB
$2.1B
$566K ﹤0.01%
+10,600
New +$585K
FLG
1077
Flagstar Bank National Association
FLG
$5.92B
$564K ﹤0.01%
48,866
-8,090
-14% -$96.2K
PPL
1078
PPL Corp
PPL
$26.8B
$564K ﹤0.01%
15,170
-973
-6% -$35K
HLT icon
1079
Hilton Worldwide
HLT
$72.2B
$560K ﹤0.01%
2,160
+24
+1% +$6.49K
SHM icon
1080
State Street SPDR Nuveen ICE Short Term Municipal Bond ETF
SHM
$3.48B
$557K ﹤0.01%
11,543
-405
-3% -$19.5K
MBB icon
1081
iShares MBS ETF
MBB
$39.2B
$556K ﹤0.01%
5,839
+1,059
+22% +$99.5K
HSIC icon
1082
Henry Schein
HSIC
$10B
$550K ﹤0.01%
8,289
-376
-4% -$26K
NJUL icon
1083
Innovator Growth-100 Power Buffer ETF July
NJUL
$262M
$542K ﹤0.01%
7,628
– –
SOUN icon
1084
SoundHound AI
SOUN
$3.32B
$541K ﹤0.01%
+33,673
New +$447K
EWU icon
1085
iShares MSCI United Kingdom ETF
EWU
$4.13B
$541K ﹤0.01%
12,887
+4,200
+48% +$172K
UTHR icon
1086
United Therapeutics
UTHR
$21.5B
$541K ﹤0.01%
1,290
-53
-4% -$17.8K
XAR icon
1087
State Street SPDR S&P Aerospace & Defense ETF
XAR
$6.62B
$540K ﹤0.01%
2,300
+587
+34% +$128K
LYB icon
1088
LyondellBasell Industries
LYB
$20.2B
$539K ﹤0.01%
10,995
-3,985
-27% -$225K
PAA icon
1089
Plains All American Pipeline
PAA
$16.5B
$537K ﹤0.01%
31,505
-10,935
-26% -$196K
WDS icon
1090
Woodside Energy
WDS
$43.3B
$536K ﹤0.01%
+35,640
New +$587K
LINE
1091
Lineage Inc
LINE
$9.8B
$535K ﹤0.01%
+13,850
New +$576K
XNTK icon
1092
State Street SPDR NYSE Technology ETF
XNTK
$2.27B
$533K ﹤0.01%
1,959
-60
-3% -$14.8K
FOUR icon
1093
Shift4
FOUR
$3.79B
$532K ﹤0.01%
6,875
-231,116
-97% -$21.5M
SPHY icon
1094
State Street SPDR Portfolio High Yield Bond ETF
SPHY
$12.1B
$532K ﹤0.01%
22,203
+14,220
+178% +$338K
SF
1095
Stifel
SF
$12.9B
$530K ﹤0.01%
7,007
+558
+9% +$41.8K
VCYT icon
1096
Veracyte
VCYT
$3.42B
$529K ﹤0.01%
15,409
-550
-3% -$15.8K
MTZ icon
1097
MasTec
MTZ
$23B
$527K ﹤0.01%
2,478
+1,000
+68% +$183K
FWONK icon
1098
Liberty Media Series C
FWONK
$26B
$526K ﹤0.01%
5,040
-976
-16% -$99K
EFAV icon
1099
iShares MSCI EAFE Min Vol Factor ETF
EFAV
$5.46B
$524K ﹤0.01%
6,182
-106
-2% -$8.95K
BBVA icon
1100
Banco Bilbao Vizcaya Argentaria
BBVA
$158B
$523K ﹤0.01%
27,184
-800
-3% -$14K
42 43
44
45 46

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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.