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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 | |
|---|---|---|---|---|---|---|
301
Veralto
VLTO
$23.6B
| $13.1M | 0.04% |
123,277
-3,114
| -2% | -$329K |
|
302
JPMorgan Equity Premium Income ETF
JEPI
$46.1B
| $13.1M | 0.04% |
229,983
+17,284
| +8% | +$982K |
|
303
AT&T
T
$166B
| $12.9M | 0.03% |
457,468
-67,135
| -13% | -$1.91M |
|
304
Norfolk Southern
NSC
$75.3B
| $12.8M | 0.03% |
42,688
+689
| +2% | +$191K |
|
305
iShares Core US Aggregate Bond ETF
AGG
$138B
| $12.8M | 0.03% |
127,569
+5,114
| +4% | +$507K |
|
306
Altria Group
MO
$107B
| $12.7M | 0.03% |
192,815
+525
| +0.3% | +$33.3K |
|
307
Capital Group Growth ETF
CGGR
$25B
| $12.6M | 0.03% |
286,116
+30,102
| +12% | +$1.27M |
|
308
Starwood Property Trust
STWD
$6.09B
| $12.5M | 0.03% |
647,024
+173,462
| +37% | +$3.49M |
|
309
iShares Russell 2000 Growth ETF
IWO
$15B
| $12.5M | 0.03% |
39,155
+572
| +1% | +$173K |
|
310
Dover
DOV
$28B
| $12.5M | 0.03% |
74,917
-171
| -0.2% | -$30.7K |
|
311
JFrog
FROG
$10.4B
| $12.4M | 0.03% |
262,305
-39,840
| -13% | -$1.8M |
|
312
Floor & Decor
FND
$6.32B
| $12.4M | 0.03% |
168,396
+64,157
| +62% | +$5.26M |
|
313
EOG Resources
EOG
$75.1B
| $12.2M | 0.03% |
108,901
+4,827
| +5% | +$576K |
|
314
Moody's
MCO
$82.8B
| $12.2M | 0.03% |
25,573
-232
| -0.9% | -$117K |
|
315
Wheaton Precious Metals
WPM
$61.3B
| $12.1M | 0.03% |
108,592
-78
| -0.1% | -$7.62K |
|
316
OptimizeRx
OPRX
$132M
| $12.1M | 0.03% |
591,139
-37,787
| -6% | -$599K |
|
317
State Street Energy Select Sector SPDR ETF
XLE
$39.9B
| $12.1M | 0.03% |
269,876
-15,396
| -5% | -$674K |
|
318
PayPal
PYPL
$50.6B
| $12M | 0.03% |
178,706
-239
| -0.1% | -$16.8K |
|
319
Church & Dwight Co
CHD
$24B
| $11.9M | 0.03% |
136,192
-9,635
| -7% | -$903K |
|
320
Duke Energy
DUK
$96.3B
| $11.9M | 0.03% |
96,299
+2,854
| +3% | +$346K |
|
321
ASML
ASML
$695B
| $11.9M | 0.03% |
12,263
-813
| -6% | -$639K |
|
322
Airbnb
ABNB
$108B
| $11.8M | 0.03% |
97,244
-42,640
| -30% | -$5.52M |
|
323
Intel
INTC
$509B
| $11.8M | 0.03% |
351,772
+55,333
| +19% | +$1.34M |
|
324
Southern Company
SO
$106B
| $11.8M | 0.03% |
124,453
+21,857
| +21% | +$2.04M |
|
325
Cigna
CI
$73.3B
| $11.8M | 0.03% |
40,885
-696
| -2% | -$206K |
|
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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.