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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
SDY icon
351
State Street SPDR S&P Dividend ETF
SDY
$22.1B
$10.4M 0.03%
74,080
+1,796
+2% +$251K
PAPR icon
352
Innovator US Equity Power Buffer ETF April
PAPR
$960M
$10.3M 0.03%
268,511
+4,271
+2% +$162K
SSNC icon
353
SS&C Technologies
SSNC
$18.8B
$10.3M 0.03%
115,883
+1,674
+1% +$145K
XBI icon
354
State Street SPDR S&P Biotech ETF
XBI
$10.5B
$10.2M 0.03%
101,810
+2,590
+3% +$233K
BROS icon
355
Dutch Bros
BROS
$8.91B
$10.2M 0.03%
194,760
-33,844
-15% -$2.14M
STKL
356
DELISTED
SunOpta
STKL
$10.1M 0.03%
1,717,439
-24,493
-1% -$152K
TRMB icon
357
Trimble
TRMB
$13.1B
$9.87M 0.03%
120,899
-38,677
-24% -$3.16M
TT icon
358
Trane Technologies
TT
$105B
$9.84M 0.03%
23,315
-214
-0.9% -$91.4K
MKC icon
359
McCormick & Company Non-Voting
MKC
$14.2B
$9.84M 0.03%
147,001
-5,414
-4% -$379K
PHO icon
360
Invesco Water Resources ETF
PHO
$2.06B
$9.81M 0.03%
136,047
-916
-0.7% -$65.6K
SHAK icon
361
Shake Shack
SHAK
$2.94B
$9.81M 0.03%
104,752
-2,704
-3% -$311K
FVD icon
362
First Trust Value Line Dividend Fund
FVD
$8.36B
$9.78M 0.03%
211,600
+121
+0.1% +$5.54K
IWN icon
363
iShares Russell 2000 Value ETF
IWN
$14.6B
$9.74M 0.03%
55,091
-858
-2% -$145K
KR icon
364
Kroger
KR
$34.3B
$9.73M 0.03%
144,291
+148
+0.1% +$10.3K
GBTC icon
365
Grayscale Bitcoin Trust
GBTC
$9.51B
$9.66M 0.03%
107,557
-43
-0% -$3.87K
RKLB icon
366
Rocket Lab Corp
RKLB
$51.9B
$9.6M 0.03%
200,318
-2,454
-1% -$111K
SPYM
367
State Street SPDR Portfolio S&P 500 ETF
SPYM
$168B
$9.59M 0.03%
122,468
+19,147
+19% +$1.44M
CACI icon
368
CACI
CACI
$15B
$9.59M 0.03%
19,234
+10,911
+131% +$5.27M
MELI icon
369
Mercado Libre
MELI
$92.7B
$9.54M 0.03%
4,083
+66
+2% +$158K
HBAN icon
370
Huntington Bancshares
HBAN
$36.1B
$9.52M 0.03%
551,425
-9,882
-2% -$169K
OMC icon
371
Omnicom Group
OMC
$23.5B
$9.49M 0.03%
116,342
-1,031
-0.9% -$77.9K
NOC icon
372
Northrop Grumman
NOC
$82B
$9.47M 0.03%
15,549
-856
-5% -$485K
ET icon
373
Energy Transfer Partners
ET
$72.1B
$9.47M 0.03%
551,919
-20,501
-4% -$359K
CARR icon
374
Carrier Global
CARR
$52B
$9.41M 0.03%
157,611
-7,251
-4% -$493K
MRSH
375
Marsh
MRSH
$90.1B
$9.39M 0.03%
46,599
-4,742
-9% -$975K
13 14
15
16 17

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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.