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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
IXN icon
1026
iShares Global Tech ETF
IXN
$9.47B
$661K ﹤0.01%
6,409
-236
-4% -$22.8K
CVLT icon
1027
Commault Systems
CVLT
$6.26B
$660K ﹤0.01%
3,497
-2,200
-39% -$397K
CWEN icon
1028
Clearway Energy Class C
CWEN
$7.02B
$659K ﹤0.01%
23,320
+158
+0.7% +$4.79K
SEE
1029
DELISTED
Sealed Air
SEE
$658K ﹤0.01%
18,610
+3,196
+21% +$102K
FTAI icon
1030
FTAI Aviation
FTAI
$22.2B
$658K ﹤0.01%
3,942
+33
+0.8% +$4.69K
VCR icon
1031
Vanguard Consumer Discretionary ETF
VCR
$6.11B
$657K ﹤0.01%
1,659
-438
-21% -$167K
EMLP icon
1032
First Trust North American Energy Infrastructure Fund
EMLP
$4.16B
$652K ﹤0.01%
17,033
-400
-2% -$15.1K
SOLV icon
1033
Solventum
SOLV
$14.7B
$651K ﹤0.01%
8,912
-1,141
-11% -$83.6K
RDDT icon
1034
Reddit
RDDT
$30.4B
$650K ﹤0.01%
2,826
-517
-15% -$106K
VPL icon
1035
Vanguard FTSE Pacific ETF
VPL
$8.65B
$649K ﹤0.01%
7,387
-295
-4% -$25.1K
SRPT icon
1036
Sarepta Therapeutics
SRPT
$1.95B
$648K ﹤0.01%
33,632
+6,459
+24% +$115K
ILCG icon
1037
iShares Morningstar Growth ETF
ILCG
$3.3B
$642K ﹤0.01%
6,153
+2
+0% +$201
LPLA icon
1038
LPL Financial
LPLA
$29.5B
$640K ﹤0.01%
1,922
-8,226
-81% -$2.98M
CTRA
1039
DELISTED
Coterra Energy
CTRA
$633K ﹤0.01%
26,765
+5,730
+27% +$138K
SVM
1040
Silvercorp Metals
SVM
$2.61B
$632K ﹤0.01%
100,000
+50,000
+100% +$245K
COLD icon
1041
Americold
COLD
$4.32B
$631K ﹤0.01%
51,561
+6,625
+15% +$98.7K
XPO icon
1042
XPO
XPO
$24.7B
$628K ﹤0.01%
4,857
-1,304
-21% -$169K
NBIX icon
1043
Neurocrine Biosciences
NBIX
$15.3B
$626K ﹤0.01%
4,461
-203
-4% -$27.5K
DNTH icon
1044
Dianthus Therapeutics
DNTH
$6.13B
$625K ﹤0.01%
+15,875
New +$406K
MORN icon
1045
Morningstar
MORN
$7.76B
$623K ﹤0.01%
2,685
-211
-7% -$56.2K
RRX icon
1046
Regal Rexnord
RRX
$11.4B
$622K ﹤0.01%
4,335
-9
-0.2% -$1.33K
FTCS icon
1047
First Trust Capital Strength ETF
FTCS
$8.02B
$622K ﹤0.01%
6,639
+35
+0.5% +$3.23K
MFC icon
1048
Manulife Financial
MFC
$72.9B
$619K ﹤0.01%
19,882
+2
+0% +$62
CAKE icon
1049
Cheesecake Factory
CAKE
$5.57B
$618K ﹤0.01%
11,318
+679
+6% +$41.6K
ACWV icon
1050
iShares MSCI Global Min Vol Factor ETF
ACWV
$3.38B
$618K ﹤0.01%
5,157
-844
-14% -$100K
40 41
42
43 44

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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.