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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 | |
|---|---|---|---|---|---|---|
751
Landstar System
LSTR
$6.4B
| $1.85M | ﹤0.01% |
15,087
+53
| +0.4% | +$7.04K |
|
752
Teradyne
TER
$64.2B
| $1.84M | ﹤0.01% |
13,337
+708
| +6% | +$77.3K |
|
753
AvalonBay Communities
AVB
$26.3B
| $1.83M | ﹤0.01% |
9,456
+23
| +0.2% | +$4.48K |
|
754
Innovator Growth-100 Power Buffer ETF April
NAPR
$213M
| $1.82M | ﹤0.01% |
34,579
-1,561
| -4% | -$81K |
|
755
iShares S&P Mid-Cap 400 Value ETF
IJJ
$9.08B
| $1.81M | ﹤0.01% |
13,973
-305
| -2% | -$39.1K |
|
756
EPAM Systems
EPAM
$5.24B
| $1.81M | ﹤0.01% |
12,014
-10,785
| -47% | -$1.77M |
|
757
Waters Corp
WAT
$40.6B
| $1.8M | ﹤0.01% |
6,003
+2,246
| +60% | +$678K |
|
758
Celsius Holdings
CELH
$7.28B
| $1.8M | ﹤0.01% |
31,241
-2,488
| -7% | -$130K |
|
759
Estee Lauder
EL
$31.6B
| $1.79M | ﹤0.01% |
20,299
+482
| +2% | +$42.9K |
|
|
TLN
760
Talen Energy Corp
TLN
$17.2B
| $1.77M | ﹤0.01% |
4,154
+2,933
| +240% | +$1.06M |
|
761
iShares ESG Aware MSCI USA ETF
ESGU
$18.5B
| $1.76M | ﹤0.01% |
12,074
-192
| -2% | -$26.9K |
|
762
argenx
ARGX
$53.6B
| $1.76M | ﹤0.01% |
2,383
+73
| +3% | +$48.1K |
|
763
General Motors
GM
$75.8B
| $1.76M | ﹤0.01% |
28,826
-99
| -0.3% | -$5.52K |
|
764
Cadence Design Systems
CDNS
$89.2B
| $1.74M | ﹤0.01% |
4,965
+453
| +10% | +$156K |
|
765
Aecom
ACM
$8.19B
| $1.74M | ﹤0.01% |
13,335
+9,379
| +237% | +$1.13M |
|
766
Truist Financial
TFC
$64.7B
| $1.74M | ﹤0.01% |
38,030
+2,519
| +7% | +$114K |
|
767
Ford
F
$55.4B
| $1.73M | ﹤0.01% |
144,492
-22,747
| -14% | -$262K |
|
768
First Citizens BancShares
FCNCA
$25.6B
| $1.73M | ﹤0.01% |
965
-2
| -0.2% | -$3.94K |
|
769
MPLX
MPLX
$59.6B
| $1.73M | ﹤0.01% |
34,542
+1,092
| +3% | +$55.4K |
|
770
Pure Cycle
PCYO
$273M
| $1.71M | ﹤0.01% |
154,533
-2,173
| -1% | -$22.7K |
|
771
iShares Biotechnology ETF
IBB
$9.77B
| $1.71M | ﹤0.01% |
11,842
-2,440
| -17% | -$333K |
|
|
LNW
772
DELISTED
Light & Wonder
LNW
| $1.7M | ﹤0.01% |
+20,296
| New | +$1.86M |
|
773
Roblox
RBLX
$27.1B
| $1.7M | ﹤0.01% |
12,295
+1,073
| +10% | +$133K |
|
774
Public Service Enterprise Group
PEG
$37.8B
| $1.69M | ﹤0.01% |
20,193
-130
| -0.6% | -$10.9K |
|
775
Vanguard Energy ETF
VDE
$10.4B
| $1.68M | ﹤0.01% |
13,376
-9,985
| -43% | -$1.23M |
|
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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.