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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
+606.62%
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 Miscellaneous 13.04%
4 Industrials 12.59%
5 Healthcare 10.97%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
AON icon
51
Aon
AON
$66.1B
$189M 0.5%
529,773
-38,214
-7% -$13.8M
VEA icon
52
Vanguard FTSE Developed Markets ETF
VEA
$234B
$182M 0.49%
3,044,272
+87,435
+3% +$5.1M
NFLX icon
53
Netflix
NFLX
$334B
$179M 0.48%
1,492,320
-10,230
-0.7% -$1.25M
JNJ icon
54
Johnson & Johnson
JNJ
$642B
$176M 0.47%
948,277
-4,580
-0.5% -$785K
INTU icon
55
Intuit
INTU
$90.6B
$171M 0.46%
250,286
-5,052
-2% -$3.64M
AAON icon
56
Aaon
AAON
$6.23B
$170M 0.45%
1,819,292
-460,778
-20% -$37.7M
ANET icon
57
Arista Networks
ANET
$237B
$162M 0.43%
1,112,568
-44,814
-4% -$5.77M
VEU icon
58
Vanguard FTSE All-World ex-US ETF
VEU
$69.4B
$162M 0.43%
2,266,265
+210,688
+10% +$14.5M
QQQ icon
59
Invesco QQQ Trust
QQQ
$477B
$159M 0.42%
265,585
-4,802
-2% -$2.75M
AMT icon
60
American Tower
AMT
$82.4B
$150M 0.4%
782,048
+8,874
+1% +$1.85M
VTV icon
61
Vanguard Morningstar Value ETF
VTV
$191B
$150M 0.4%
804,306
-19,556
-2% -$3.54M
RYAN icon
62
Ryan Specialty Holdings
RYAN
$4.85B
$150M 0.4%
2,660,791
-153,404
-5% -$9.09M
CRM icon
63
Salesforce
CRM
$214B
$146M 0.39%
614,695
-40,892
-6% -$10.3M
VIG icon
64
Vanguard Dividend Appreciation ETF
VIG
$111B
$144M 0.38%
666,611
+31,088
+5% +$6.53M
ORCL icon
65
Oracle
ORCL
$417B
$144M 0.38%
510,419
-8,818
-2% -$2.25M
BA icon
66
Boeing
BA
$166B
$144M 0.38%
665,006
+6,951
+1% +$1.57M
PG icon
67
Procter & Gamble
PG
$339B
$143M 0.38%
928,397
-51,866
-5% -$8.1M
DXCM icon
68
DexCom
DXCM
$32B
$142M 0.38%
2,109,343
-98,701
-4% -$7.81M
ADBE icon
69
Adobe
ADBE
$106B
$139M 0.37%
393,313
-172,058
-30% -$61.7M
IBM icon
70
IBM
IBM
$235B
$130M 0.35%
459,740
-15,883
-3% -$4.16M
CWAN
71
DELISTED
Clearwater Analytics
CWAN
$129M 0.34%
7,134,647
+3,245,986
+83% +$65.8M
IRTC icon
72
iRhythm Holdings
IRTC
$3.78B
$127M 0.34%
740,721
+1,390
+0.2% +$221K
ROL icon
73
Rollins
ROL
$17B
$125M 0.33%
2,124,489
-45,723
-2% -$2.6M
GS icon
74
Goldman Sachs
GS
$288B
$122M 0.32%
153,206
+3,190
+2% +$2.36M
IWM icon
75
iShares Russell 2000 ETF
IWM
$77.6B
$121M 0.32%
500,461
+6,881
+1% +$1.58M
1 2
3
4 5

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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 Miscellaneous.

  • 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.