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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
(+4.4%)
Cap. Flow
-$160M
Cap. Flow
% of AUM
-0.43%
Top 10 Holdings %
Top 10 Hldgs %
26.02%
Holding
1,919
New
98
Increased
697
Reduced
774
Closed
75
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Meta Platforms (Facebook)
META
|
+$76.1M |
| 2 |
Applovin
APP
|
+$75.3M |
| 3 |
ServiceNow
NOW
|
+$66.6M |
| 4 |
CWAN
Clearwater Analytics
CWAN
|
+$65.8M |
| 5 |
Diamondback Energy
FANG
|
+$30.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
CYBR
CyberArk
CYBR
|
+$70.7M |
| 2 |
Adobe
ADBE
|
+$61.7M |
| 3 |
Microsoft
MSFT
|
+$45.7M |
| 4 |
Workday
WDAY
|
+$42.6M |
| 5 |
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 | |
|---|---|---|---|---|---|---|
|
ZNOV
701
Innovator Equity Defined Protection ETF - 1 Yr November
ZNOV
$105M
| $2.26M | 0.01% |
85,675
-30,484
| -26% | -$797K |
|
|
KRMN
702
Karman Holdings
KRMN
$8.08B
| $2.26M | 0.01% |
31,282
+16,872
| +117% | +$925K |
|
703
Littelfuse
LFUS
$11.5B
| $2.25M | 0.01% |
8,697
-248
| -3% | -$62.1K |
|
704
Brown & Brown
BRO
$23.8B
| $2.25M | 0.01% |
23,975
+1,283
| +6% | +$125K |
|
705
Ionis Pharmaceuticals
IONS
$9.28B
| $2.25M | 0.01% |
34,371
-3,520
| -9% | -$172K |
|
706
WisdomTree US High Dividend Fund
DHS
$1.59B
| $2.23M | 0.01% |
22,145
| – | – |
|
707
JPMorgan BetaBuilders Japan ETF
BBJP
$19.2B
| $2.21M | 0.01% |
33,257
| – | – |
|
708
Innovator US Small Cap Power Buffer ETF July
KJUL
$227M
| $2.2M | 0.01% |
71,177
| – | – |
|
709
Newmont
NEM
$120B
| $2.2M | 0.01% |
26,061
-5,091
| -16% | -$355K |
|
710
Byline Bancorp
BY
$1.78B
| $2.19M | 0.01% |
79,124
+71,401
| +925% | +$1.99M |
|
711
CRISPR Therapeutics
CRSP
$5.23B
| $2.19M | 0.01% |
33,739
-1,391
| -4% | -$79.9K |
|
712
CAVA Group
CAVA
$8.46B
| $2.17M | 0.01% |
35,866
+5,114
| +17% | +$387K |
|
713
Uranium Energy
UEC
$5.55B
| $2.12M | 0.01% |
159,000
-1,200
| -0.7% | -$12K |
|
714
Freeport-McMoran
FCX
$93.8B
| $2.12M | 0.01% |
53,973
-2,119
| -4% | -$91.9K |
|
715
Diageo
DEO
$52.8B
| $2.12M | 0.01% |
22,165
-7,066
| -24% | -$742K |
|
716
Global X NASDAQ-100 Covered Call ETF
QYLD
$8.29B
| $2.08M | 0.01% |
122,168
-79,005
| -39% | -$1.33M |
|
717
Otis Worldwide
OTIS
$27.9B
| $2.07M | 0.01% |
22,692
-2,078
| -8% | -$189K |
|
718
RPM International
RPM
$14.5B
| $2.07M | 0.01% |
17,553
+5
| +0% | +$600 |
|
719
iShares Morningstar Mid-Cap Growth ETF
IMCG
$4.18B
| $2.07M | 0.01% |
24,996
-5,698
| -19% | -$465K |
|
720
Vanguard Financials ETF
VFH
$13.9B
| $2.06M | 0.01% |
15,679
-1,818
| -10% | -$235K |
|
721
Penumbra
PEN
$12.9B
| $2.05M | 0.01% |
8,108
-2,456
| -23% | -$619K |
|
722
Realty Income
O
$59.7B
| $2.05M | 0.01% |
33,674
+15,111
| +81% | +$880K |
|
723
Cameco
CCJ
$42.7B
| $2.05M | 0.01% |
24,398
+8,710
| +56% | +$675K |
|
724
Vanguard Short-Term Corporate Bond ETF
VCSH
$45.1B
| $2.03M | 0.01% |
25,456
-5,067
| -17% | -$403K |
|
|
NVO
725
Novo Nordisk
NVO
$202B
| $2.01M | 0.01% |
36,288
-6,912
| -16% | -$405K |
|
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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.