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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
PGX icon
526
Invesco Preferred ETF
PGX
$3.77B
$4.76M 0.01%
410,030
+46,472
+13% +$532K
AZO icon
527
AutoZone
AZO
$49.8B
$4.75M 0.01%
1,108
+3
+0.3% +$12K
ENVX icon
528
Enovix
ENVX
$993M
$4.75M 0.01%
476,450
+111,881
+31% +$1.24M
VT icon
529
Vanguard Total World Stock ETF
VT
$81.8B
$4.75M 0.01%
34,450
+2,218
+7% +$295K
BNY
530
Bank of New York Mellon
BNY
$110B
$4.75M 0.01%
43,557
+7,108
+20% +$725K
FICO icon
531
Fair Isaac
FICO
$22.9B
$4.74M 0.01%
3,169
-92
-3% -$138K
WEC icon
532
WEC Energy
WEC
$35.8B
$4.73M 0.01%
41,305
-693
-2% -$75.1K
ALNY icon
533
Alnylam Pharmaceuticals
ALNY
$30.1B
$4.67M 0.01%
10,244
-348
-3% -$142K
QQQM icon
534
Invesco NASDAQ 100 ETF
QQQM
$104B
$4.63M 0.01%
18,731
+1,232
+7% +$290K
HDV
535
iShares Core High Dividend ETF
HDV
$15.1B
$4.61M 0.01%
188,125
+545
+0.3% +$13.2K
WSM icon
536
Williams-Sonoma
WSM
$28.8B
$4.59M 0.01%
23,469
-164
-0.7% -$31.3K
FNF icon
537
Fidelity National Financial
FNF
$13B
$4.57M 0.01%
75,499
-4,020
-5% -$234K
CRDF icon
538
Cardiff Oncology
CRDF
$79.4M
$4.56M 0.01%
2,213,606
-310,512
-12% -$858K
DLR icon
539
Digital Realty Trust
DLR
$73B
$4.55M 0.01%
26,322
+1,088
+4% +$186K
FIVE icon
540
Five Below
FIVE
$13.5B
$4.53M 0.01%
29,262
-12,661
-30% -$1.79M
HYG icon
541
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
$17.9B
$4.52M 0.01%
55,658
+703
+1% +$56.6K
B
542
Barrick Mining
B
$67B
$4.52M 0.01%
137,824
+29,025
+27% +$736K
CACC icon
543
Credit Acceptance
CACC
$5.98B
$4.51M 0.01%
9,663
+3
+0% +$1.5K
ROKU icon
544
Roku
ROKU
$22.8B
$4.51M 0.01%
45,015
+603
+1% +$55.6K
EQT icon
545
EQT Corp
EQT
$33.7B
$4.49M 0.01%
82,525
-12,323
-13% -$651K
PSEP icon
546
Innovator US Equity Power Buffer ETF September
PSEP
$842M
$4.48M 0.01%
104,304
+75,905
+267% +$3.18M
SHEL icon
547
Shell
SHEL
$247B
$4.47M 0.01%
62,475
+250
+0.4% +$18K
IGSB icon
548
iShares 1-5 Year Investment Grade Corporate Bond ETF
IGSB
$23.4B
$4.47M 0.01%
84,263
– –
VGK icon
549
Vanguard FTSE Europe ETF
VGK
$31B
$4.46M 0.01%
55,910
+4,814
+9% +$377K
AIOT
550
PowerFleet Inc
AIOT
$423M
$4.46M 0.01%
851,352
-66,506
-7% -$307K
20 21
22
23 24

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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.