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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
CCC
651
CCC Intelligent Solutions
CCC
$4.01B
$2.77M 0.01%
304,460
+3,788
+1% +$36.6K
RY icon
652
Royal Bank of Canada
RY
$298B
$2.76M 0.01%
18,728
-153
-0.8% -$21.1K
LEN icon
653
Lennar Class A
LEN
$21B
$2.74M 0.01%
21,762
+299
+1% +$37.1K
EPI icon
654
WisdomTree India Earnings Fund ETF
EPI
$2.04B
$2.73M 0.01%
61,762
+2,272
+4% +$103K
SNA icon
655
Snap-on
SNA
$20.9B
$2.72M 0.01%
7,841
+7
+0.1% +$2.29K
CIEN icon
656
Ciena
CIEN
$64.2B
$2.7M 0.01%
18,510
-3,510
-16% -$357K
PSN icon
657
Parsons
PSN
$5.07B
$2.69M 0.01%
32,498
-6,542
-17% -$506K
OSBC icon
658
Old Second Bancorp
OSBC
$1.31B
$2.67M 0.01%
154,436
+136,416
+757% +$2.46M
CHRW icon
659
C.H. Robinson
CHRW
$17.6B
$2.65M 0.01%
20,038
-213
-1% -$25K
RAL
660
Ralliant Corp
RAL
$7.98B
$2.65M 0.01%
60,645
-24,259
-29% -$1.08M
D icon
661
Dominion Energy
D
$60.4B
$2.65M 0.01%
43,340
+8,527
+24% +$507K
SCHO icon
662
Schwab Short-Term US Treasury ETF
SCHO
$13B
$2.65M 0.01%
108,572
+12,462
+13% +$303K
PPA icon
663
Invesco Aerospace & Defense ETF
PPA
$8.69B
$2.65M 0.01%
17,039
+1,067
+7% +$157K
HEI.A icon
664
HEICO Corp Class A
HEI.A
$38.1B
$2.62M 0.01%
10,316
+51
+0.5% +$12.7K
BE icon
665
Bloom Energy
BE
$71.5B
$2.61M 0.01%
30,896
+14,650
+90% +$680K
MAIN icon
666
Main Street Capital
MAIN
$5.53B
$2.61M 0.01%
41,072
-100
-0.2% -$6.46K
HAL icon
667
Halliburton
HAL
$27.4B
$2.61M 0.01%
106,055
-27,251
-20% -$603K
STZ icon
668
Constellation Brands
STZ
$23.2B
$2.61M 0.01%
19,352
+3,706
+24% +$589K
ELS icon
669
Equity Lifestyle Properties
ELS
$12.6B
$2.59M 0.01%
42,630
+12
+0% +$728
MRCC
670
DELISTED
Monroe Capital Corp
MRCC
$2.56M 0.01%
364,804
-29,776
-8% -$205K
AMG icon
671
Affiliated Managers Group
AMG
$9.65B
$2.56M 0.01%
10,736
-149
-1% -$32.8K
ODFL icon
672
Old Dominion Freight Line
ODFL
$45.1B
$2.54M 0.01%
18,074
-651
-3% -$99.7K
AKAM icon
673
Akamai
AKAM
$17.9B
$2.54M 0.01%
33,583
-1,890
-5% -$146K
CBRE icon
674
CBRE Group
CBRE
$43.3B
$2.54M 0.01%
16,124
+719
+5% +$111K
DOW icon
675
Dow Inc
DOW
$21.9B
$2.53M 0.01%
110,133
-46,903
-30% -$1.17M
25 26
27
28 29

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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.