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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
TFPM icon
1251
Triple Flag Precious Metals
TFPM
$6.45B
$351K ﹤0.01%
12,000
– –
IPAY icon
1252
Amplify Mobile Payments ETF
IPAY
$188M
$349K ﹤0.01%
6,115
– –
SANM icon
1253
Sanmina
SANM
$11.1B
$348K ﹤0.01%
+3,025
New +$340K
NTLA icon
1254
Intellia Therapeutics
NTLA
$1.66B
$348K ﹤0.01%
+20,160
New +$248K
EG icon
1255
Everest Group
EG
$14B
$348K ﹤0.01%
+994
New +$336K
RYN icon
1256
Rayonier
RYN
$6.54B
$348K ﹤0.01%
13,756
+3
+0% +$72
MTH icon
1257
Meritage Homes
MTH
$4.8B
$347K ﹤0.01%
4,786
+1,656
+53% +$123K
BAC.PRL icon
1258
Bank of America Series L
BAC.PRL
$4.01B
$343K ﹤0.01%
268
– –
GLTR icon
1259
abrdn Physical Precious Metals Basket Shares ETF
GLTR
$2.67B
$342K ﹤0.01%
2,069
+285
+16% +$41.7K
SKYY icon
1260
First Trust Cloud Computing ETF
SKYY
$3.38B
$341K ﹤0.01%
2,537
+392
+18% +$49.3K
IQLT icon
1261
iShares MSCI Intl Quality Factor ETF
IQLT
$14.3B
$339K ﹤0.01%
7,679
-2,917
-28% -$126K
IDEV icon
1262
iShares Core MSCI International Developed Markets ETF
IDEV
$32.7B
$339K ﹤0.01%
4,227
-841
-17% -$65.4K
ALLE icon
1263
Allegion
ALLE
$14.2B
$338K ﹤0.01%
1,908
+126
+7% +$20.8K
MTX icon
1264
Minerals Technologies
MTX
$2.26B
$337K ﹤0.01%
5,430
-2,129
-28% -$130K
MGEE icon
1265
MGE Energy Inc
MGEE
$3.06B
$337K ﹤0.01%
4,000
– –
FLJP icon
1266
Franklin FTSE Japan ETF
FLJP
$4.14B
$336K ﹤0.01%
+9,735
New +$324K
ARW icon
1267
Arrow Electronics
ARW
$10.6B
$336K ﹤0.01%
2,773
+483
+21% +$60.8K
FAF icon
1268
First American
FAF
$7.56B
$335K ﹤0.01%
5,222
– –
ODC icon
1269
Oil-Dri
ODC
$1.27B
$334K ﹤0.01%
5,480
– –
HUBS icon
1270
HubSpot
HUBS
$12B
$334K ﹤0.01%
715
-255
-26% -$128K
IFRA icon
1271
iShares US Infrastructure ETF
IFRA
$4.62B
$334K ﹤0.01%
6,321
+236
+4% +$12.1K
IDCC icon
1272
InterDigital
IDCC
$8.88B
$333K ﹤0.01%
966
-3,286
-77% -$893K
FHN icon
1273
First Horizon
FHN
$12.3B
$333K ﹤0.01%
14,719
-242
-2% -$5.38K
NXT icon
1274
Nextpower Inc
NXT
$15.9B
$331K ﹤0.01%
+4,469
New +$288K
MZTI
1275
The Marzetti Company
MZTI
$3.22B
$331K ﹤0.01%
1,913
-2,990
-61% -$536K
49 50
51
52 53

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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.