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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 | |
|---|---|---|---|---|---|---|
26
AbbVie
ABBV
$439B
| $293M | 0.78% |
1,263,581
+6,169
| +0.5% | +$1.26M |
|
27
Intercontinental Exchange
ICE
$84.8B
| $291M | 0.78% |
1,729,769
-23,120
| -1% | -$4.13M |
|
28
Danaher
DHR
$145B
| $271M | 0.72% |
1,366,102
-9,622
| -0.7% | -$1.91M |
|
29
Guidewire Software
GWRE
$14.5B
| $266M | 0.71% |
1,158,043
-16,582
| -1% | -$3.77M |
|
30
CoStar Group
CSGP
$12.4B
| $264M | 0.7% |
3,128,473
+257,311
| +9% | +$22.7M |
|
|
P
31
Everpure Inc
P
$36.6B
| $259M | 0.69% |
3,085,052
-39,490
| -1% | -$2.63M |
|
32
Palo Alto Networks
PANW
$314B
| $252M | 0.67% |
1,237,864
+79,978
| +7% | +$15.3M |
|
|
FISV
33
Fiserv Inc
FISV
$27B
| $249M | 0.66% |
1,935,022
-172,497
| -8% | -$24.7M |
|
34
Walmart Inc
WMT
$914B
| $248M | 0.66% |
2,406,279
-28,735
| -1% | -$2.86M |
|
35
American Express
AXP
$230B
| $234M | 0.62% |
703,490
+24,920
| +4% | +$7.93M |
|
36
Blackstone
BX
$109B
| $233M | 0.62% |
1,361,649
+5,717
| +0.4% | +$980K |
|
37
Eli Lilly
LLY
$1.09T
| $229M | 0.61% |
299,549
-4,918
| -2% | -$3.66M |
|
38
TransDigm Group
TDG
$69.1B
| $228M | 0.61% |
172,649
-304
| -0.2% | -$435K |
|
|
39
Applovin
APP
$104B
| $227M | 0.61% |
316,388
+163,210
| +107% | +$75.3M |
|
40
Berkshire Hathaway Class B
BRK.B
$1.09T
| $224M | 0.6% |
445,234
+2,637
| +0.6% | +$1.28M |
|
41
Tyler Technologies
TYL
$13B
| $222M | 0.59% |
424,708
-60
| -0% | -$33.7K |
|
42
BWX Technologies
BWXT
$15.6B
| $220M | 0.58% |
1,191,068
+187,461
| +19% | +$30.2M |
|
43
Ecolab
ECL
$78.8B
| $217M | 0.58% |
794,143
-11,013
| -1% | -$2.99M |
|
44
Abbott
ABT
$192B
| $214M | 0.57% |
1,598,206
-5,099
| -0.3% | -$669K |
|
45
Copart
CPRT
$26.7B
| $213M | 0.57% |
4,738,566
-343,725
| -7% | -$16.2M |
|
|
46
Workday
WDAY
$43.1B
| $213M | 0.57% |
882,933
-184,186
| -17% | -$42.6M |
|
47
Cintas
CTAS
$81.9B
| $206M | 0.55% |
1,005,955
-8,620
| -0.8% | -$1.84M |
|
48
Intuitive Surgical
ISRG
$143B
| $205M | 0.55% |
458,006
-8,017
| -2% | -$3.85M |
|
49
Vanguard S&P 500 ETF
VOO
$1.03T
| $202M | 0.54% |
330,019
+26,239
| +9% | +$15.5M |
|
50
Zoetis
ZTS
$29.9B
| $199M | 0.53% |
1,363,155
-268,716
| -16% | -$40.6M |
|
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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.