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William Blair & Company Portfolio holdings
AUM
$34.9B
1-Year Est. Return
18.88%
This Fund
S&P 500
This Quarter
Est. Return
+1.73%
1 Year Est. Return
+18.88%
3 Year Est. Return
+73.84%
5 Year Est. Return
+90.13%
10 Year Est. Return
+563.35%
AUM
$37.3B
AUM Growth
-$310M
(-0.82%)
Cap. Flow
-$212M
Cap. Flow
% of AUM
-0.57%
Top 10 Holdings %
Top 10 Hldgs %
27.41%
Holding
1,963
New
120
Increased
759
Reduced
753
Closed
96
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
BWX Technologies
BWXT
|
+$46.6M |
| 2 |
Meta Platforms (Facebook)
META
|
+$38.3M |
| 3 |
ServiceNow
NOW
|
+$37.6M |
| 4 |
Vanguard FTSE All-World ex-US ETF
VEU
|
+$32.4M |
| 5 |
SPDR Gold Trust
GLD
|
+$29.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
FISV
Fiserv Inc
FISV
|
+$114M |
| 2 |
CoStar Group
CSGP
|
+$78.3M |
| 3 |
CWAN
Clearwater Analytics
CWAN
|
+$75.3M |
| 4 |
Pool Corp
POOL
|
+$54M |
| 5 |
Zoetis
ZTS
|
+$51.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 25.8% |
| 2 | Financials | 13.4% |
| 3 | Industrials | 12.04% |
| 4 | Healthcare | 11.22% |
| 5 | Communication Services | 7.63% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
26
Veeva Systems
VEEV
$37.4B
| $274M | 0.74% |
1,228,578
-60,674
| -5% | -$16.1M |
|
27
Intercontinental Exchange
ICE
$84.4B
| $274M | 0.73% |
1,690,566
-39,203
| -2% | -$6.14M |
|
28
Walmart Inc
WMT
$890B
| $269M | 0.72% |
2,412,584
+6,305
| +0.3% | +$677K |
|
29
Home Depot
HD
$355B
| $260M | 0.7% |
756,182
-9,713
| -1% | -$3.56M |
|
30
American Express
AXP
$230B
| $259M | 0.7% |
700,047
-3,443
| -0.5% | -$1.23M |
|
31
Intuitive Surgical
ISRG
$134B
| $249M | 0.67% |
439,370
-18,636
| -4% | -$9.92M |
|
|
32
BWX Technologies
BWXT
$15.6B
| $249M | 0.67% |
1,439,666
+248,598
| +21% | +$46.6M |
|
33
Vanguard S&P 500 ETF
VOO
$1.03T
| $235M | 0.63% |
375,230
+45,211
| +14% | +$28.1M |
|
34
Palo Alto Networks
PANW
$297B
| $230M | 0.62% |
1,250,372
+12,508
| +1% | +$2.52M |
|
35
Guidewire Software
GWRE
$14.2B
| $228M | 0.61% |
1,134,551
-23,492
| -2% | -$5.2M |
|
36
Watsco Inc
WSO
$13.6B
| $228M | 0.61% |
675,440
-124,516
| -16% | -$44.5M |
|
37
TransDigm Group
TDG
$67.7B
| $226M | 0.61% |
170,230
-2,419
| -1% | -$3.17M |
|
38
Ecolab
ECL
$79.9B
| $225M | 0.6% |
857,871
+63,728
| +8% | +$17M |
|
39
Berkshire Hathaway Class B
BRK.B
$1.13T
| $225M | 0.6% |
447,062
+1,828
| +0.4% | +$909K |
|
40
Blackstone
BX
$110B
| $211M | 0.57% |
1,369,045
+7,396
| +0.5% | +$1.12M |
|
|
P
41
Everpure Inc
P
$29.9B
| $205M | 0.55% |
3,053,622
-31,430
| -1% | -$2.63M |
|
|
42
Vanguard FTSE All-World ex-US ETF
VEU
$70.2B
| $199M | 0.54% |
2,711,435
+445,170
| +20% | +$32.4M |
|
43
Applovin
APP
$116B
| $198M | 0.53% |
294,439
-21,949
| -7% | -$13.8M |
|
44
Abbott
ABT
$187B
| $198M | 0.53% |
1,577,799
-20,407
| -1% | -$2.6M |
|
45
Vanguard FTSE Developed Markets ETF
VEA
$237B
| $197M | 0.53% |
3,148,531
+104,259
| +3% | +$6.39M |
|
46
Johnson & Johnson
JNJ
$625B
| $197M | 0.53% |
949,575
+1,298
| +0.1% | +$257K |
|
47
Tyler Technologies
TYL
$12.8B
| $187M | 0.5% |
412,858
-11,850
| -3% | -$5.65M |
|
48
Cintas
CTAS
$81.3B
| $187M | 0.5% |
995,017
-10,938
| -1% | -$2.06M |
|
49
Workday
WDAY
$44.4B
| $178M | 0.48% |
829,064
-53,869
| -6% | -$12.2M |
|
50
Aon
AON
$76B
| $175M | 0.47% |
496,307
-33,466
| -6% | -$11.7M |
|
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William Blair & Company's Q4 2025 Portfolio in Review
As of Q4 2025, William Blair & Company held 1,963 positions worth $37.3B, down 0.82% from $37.6B the previous quarter. Its ten largest holdings account for 27% of the portfolio.
William Blair & Company's Q4 2025 filing shows 120 new, 759 increased, 753 reduced and 96 closed positions. Its largest new stake was Wingstop: 90,773 shares worth $21.6M. The largest sale was Fiserv Inc, an estimated $114M.
By sector, the portfolio is most concentrated in Technology at 26% of assets, down from 27% a quarter earlier, followed by Financials and Industrials.
- William Blair & Company's largest Q4 2025 buy was Wingstop: 90,773 shares worth $21.6M.
- William Blair & Company added most to BWX Technologies in Q4 2025, an estimated $46.6M increase.
- William Blair & Company's biggest Q4 2025 reduction was Fiserv Inc, cutting an estimated $114M.
- William Blair & Company fully exited SAP in Q4 2025, selling an estimated $9.19M.
- William Blair & Company's ten largest holdings make up 27% of its $37.3B portfolio in Q4 2025.
- William Blair & Company opened 120 new positions and closed 96 in Q4 2025.
- William Blair & Company's portfolio value fell 0.82% quarter-over-quarter to $37.3B.
Based on William Blair & Company's 13F filing for Q4 2025, filed 17 Feb 2026.