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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
MKC.V icon
1451
McCormick & Company Voting
MKC.V
$14.2B
$208K ﹤0.01%
3,121
+1,200
+62% +$84K
STLD icon
1452
Steel Dynamics
STLD
$37.7B
$208K ﹤0.01%
1,489
-324
-18% -$42.5K
LPX icon
1453
Louisiana-Pacific
LPX
$5.15B
$205K ﹤0.01%
+2,312
New +$213K
DBA icon
1454
Invesco DB Agriculture Fund
DBA
$1.24B
$205K ﹤0.01%
+7,668
New +$204K
WMG icon
1455
Warner Music
WMG
$13B
$205K ﹤0.01%
+6,017
New +$192K
IYG icon
1456
iShares US Financial Services ETF
IYG
$2.22B
$205K ﹤0.01%
2,282
– –
MRUS
1457
DELISTED
Merus
MRUS
$203K ﹤0.01%
+2,151
New +$140K
MRNA icon
1458
Moderna
MRNA
$25.4B
$202K ﹤0.01%
7,834
-663
-8% -$18.5K
SSD icon
1459
Simpson Manufacturing
SSD
$7.99B
$202K ﹤0.01%
+1,208
New +$216K
CHTR icon
1460
Charter Communications
CHTR
$17.9B
$201K ﹤0.01%
731
-70
-9% -$21.2K
UUP icon
1461
Invesco DB US Dollar Index Bullish Fund
UUP
$415M
$201K ﹤0.01%
+7,290
New +$200K
FDUS icon
1462
Fidus Investment
FDUS
$748M
$200K ﹤0.01%
+9,883
New +$208K
GNTX icon
1463
Gentex
GNTX
$4.93B
$200K ﹤0.01%
+7,070
New +$188K
RSPH icon
1464
Invesco S&P 500 Equal Weight Health Care ETF
RSPH
$796M
$200K ﹤0.01%
6,800
-200
-3% -$5.79K
QUS icon
1465
State Street SPDR MSCI USA StrategicFactors ETF
QUS
$1.58B
$198K ﹤0.01%
1,157
-94
-8% -$15.6K
SCHK icon
1466
Schwab 1000 Index ETF
SCHK
$5.94B
$197K ﹤0.01%
6,124
– –
ECAT icon
1467
BlackRock ESG Capital Allocation Term Trust
ECAT
$1.57B
$195K ﹤0.01%
11,871
-10,000
-46% -$164K
XHB icon
1468
State Street SPDR S&P Homebuilders ETF
XHB
$1.58B
$193K ﹤0.01%
1,741
+652
+60% +$71.5K
TFI icon
1469
State Street SPDR Nuveen ICE Municipal Bond ETF
TFI
$3.17B
$192K ﹤0.01%
4,204
-109
-3% -$4.88K
BXMT icon
1470
Blackstone Mortgage Trust
BXMT
$2.41B
$191K ﹤0.01%
10,375
– –
IGF icon
1471
iShares Global Infrastructure ETF
IGF
$10.7B
$190K ﹤0.01%
3,107
+235
+8% +$14.1K
AVPT icon
1472
AvePoint
AVPT
$2.75B
$190K ﹤0.01%
+12,650
New +$212K
JMIA
1473
Jumia Technologies
JMIA
$793M
$188K ﹤0.01%
16,200
-17,500
-52% -$128K
AGNC icon
1474
AGNC Investment
AGNC
$12.9B
$188K ﹤0.01%
19,195
+4,745
+33% +$46K
CGW icon
1475
Invesco S&P Global Water Index ETF
CGW
$1.07B
$187K ﹤0.01%
2,904
-3
-0.1% -$190
57 58
59
60 61

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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.