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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
SHYG icon
1501
iShares 0-5 Year High Yield Corporate Bond ETF
SHYG
$7.61B
$155K ﹤0.01%
3,591
-2,998
-46% -$129K
PCG icon
1502
PG&E
PCG
$38.3B
$153K ﹤0.01%
+10,146
New +$148K
MBLY icon
1503
Mobileye
MBLY
$7.48B
$149K ﹤0.01%
+10,533
New +$157K
VTRS icon
1504
Viatris
VTRS
$18.5B
$148K ﹤0.01%
14,988
-1,174
-7% -$11.4K
IYY icon
1505
iShares Dow Jones US ETF
IYY
$3.07B
$148K ﹤0.01%
910
– –
BCSF icon
1506
Bain Capital Specialty
BCSF
$821M
$147K ﹤0.01%
10,339
– –
MCHI icon
1507
iShares MSCI China ETF
MCHI
$6.21B
$147K ﹤0.01%
2,226
-20
-0.9% -$1.2K
OTF
1508
Blue Owl Technology Finance Corp
OTF
$5.27B
$145K ﹤0.01%
+10,473
New +$157K
VERU icon
1509
Veru
VERU
$46.7M
$144K ﹤0.01%
38,000
– –
KELYA icon
1510
Kelly Services Class A
KELYA
$536M
$144K ﹤0.01%
11,000
-5,331
-33% -$71.1K
SMIN icon
1511
iShares MSCI India Small-Cap ETF
SMIN
$771M
$143K ﹤0.01%
1,999
-772
-28% -$57.4K
AG icon
1512
First Majestic Silver
AG
$9.44B
$142K ﹤0.01%
11,575
-499
-4% -$4.62K
SCHP icon
1513
Schwab US TIPS ETF
SCHP
$16.2B
$142K ﹤0.01%
5,267
-1,592
-23% -$42.6K
ETHO icon
1514
Amplify Etho Climate Leadership US ETF
ETHO
$195M
$142K ﹤0.01%
2,227
+2
+0.1% +$122
PBR icon
1515
Petrobras
PBR
$114B
$141K ﹤0.01%
+11,157
New +$140K
LZ icon
1516
LegalZoom.com
LZ
$930M
$141K ﹤0.01%
13,586
-136,781
-91% -$1.36M
NUSC icon
1517
Nuveen ESG Small-Cap ETF
NUSC
$1.34B
$139K ﹤0.01%
3,153
+2,749
+680% +$117K
XIFR
1518
XPLR Infrastructure LP
XIFR
$1.08B
$139K ﹤0.01%
13,640
-475
-3% -$4.59K
SPTM icon
1519
State Street SPDR Portfolio S&P 1500 Composite Stock Market ETF
SPTM
$14.1B
$138K ﹤0.01%
1,713
-200
-10% -$15.5K
IXJ icon
1520
iShares Global Healthcare ETF
IXJ
$4.23B
$138K ﹤0.01%
1,558
-470
-23% -$40.6K
DWM icon
1521
WisdomTree International Equity Fund
DWM
$693M
$137K ﹤0.01%
2,070
+7
+0.3% +$455
RITM icon
1522
Rithm Capital
RITM
$5.71B
$136K ﹤0.01%
+11,954
New +$145K
FHLC icon
1523
Fidelity MSCI Health Care Index ETF
FHLC
$3.42B
$135K ﹤0.01%
2,020
+137
+7% +$8.85K
ARDX icon
1524
Ardelyx
ARDX
$1.03B
$135K ﹤0.01%
24,500
– –
SPTL icon
1525
State Street SPDR Portfolio Long Term Treasury ETF
SPTL
$10.7B
$135K ﹤0.01%
4,992
-196
-4% -$5.17K
59 60
61
62 63

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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.