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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
+12.61%
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
$36B
AUM Growth
+$2.85B
(+8.6%)
Cap. Flow
-$222M
Cap. Flow
% of AUM
-0.62%
Top 10 Holdings %
Top 10 Hldgs %
24.91%
Holding
1,911
New
111
Increased
662
Reduced
757
Closed
87
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
GE Vernova
GEV
|
+$116M |
| 2 |
Boeing
BA
|
+$34M |
| 3 |
CWAN
Clearwater Analytics
CWAN
|
+$31.2M |
| 4 |
NVIDIA
NVDA
|
+$27.5M |
| 5 |
Cloudflare
NET
|
+$26.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
XYZ
Block Inc
XYZ
|
+$79.4M |
| 2 |
Zoetis
ZTS
|
+$41.3M |
| 3 |
Accenture
ACN
|
+$40.8M |
| 4 |
iShares Core S&P Mid-Cap ETF
IJH
|
+$40.7M |
| 5 |
UnitedHealth
UNH
|
+$36.4M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 27.47% |
| 2 | Financials | 13.92% |
| 3 | Industrials | 12.94% |
| 4 | Healthcare | 11.51% |
| 5 | Consumer Discretionary | 7.98% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1101
Steris
STE
$23.1B
| $468K | ﹤0.01% |
1,948
+235
| +14% | +$54.7K |
|
1102
Vanguard Materials ETF
VAW
$3.13B
| $468K | ﹤0.01% |
2,401
-5,801
| -71% | -$1.09M |
|
1103
KraneShares CSI China Internet ETF
KWEB
$5.67B
| $467K | ﹤0.01% |
13,608
+5,188
| +62% | +$172K |
|
1104
Paycom
PAYC
$9.69B
| $467K | ﹤0.01% |
2,018
+79
| +4% | +$18.7K |
|
1105
Wayfair
W
$14.6B
| $465K | ﹤0.01% |
9,094
-1,220
| -12% | -$45.5K |
|
1106
Sarepta Therapeutics
SRPT
$1.77B
| $465K | ﹤0.01% |
27,173
-16,942
| -38% | -$723K |
|
1107
iShares US Consumer Staples ETF
IYK
$1.41B
| $465K | ﹤0.01% |
6,591
-399
| -6% | -$28.1K |
|
1108
Boot Barn
BOOT
$4.95B
| $463K | ﹤0.01% |
3,044
-3,035
| -50% | -$403K |
|
|
BCPC
1109
Balchem Corp
BCPC
$5.72B
| $462K | ﹤0.01% |
2,904
-39
| -1% | -$6.32K |
|
1110
Eton Pharmaceutcials
ETON
$1.22B
| $462K | ﹤0.01% |
32,400
-2,500
| -7% | -$39.5K |
|
1111
Duolingo
DUOL
$6.12B
| $461K | ﹤0.01% |
+1,124
| New | +$493K |
|
1112
Natera
NTRA
$46.4B
| $459K | ﹤0.01% |
2,717
+26
| +1% | +$4.05K |
|
1113
iShares MSCI Intl Quality Factor ETF
IQLT
$14.2B
| $458K | ﹤0.01% |
10,596
+378
| +4% | +$15.7K |
|
1114
First Trust Dow Jones Internet Index Fund ETF
FDN
$5.45B
| $457K | ﹤0.01% |
1,697
| – | – |
|
|
CSGS
1115
DELISTED
CSG Systems International
CSGS
| $455K | ﹤0.01% |
6,967
-501
| -7% | -$31.3K |
|
1116
Privia Health
PRVA
$2.87B
| $452K | ﹤0.01% |
19,639
| – | – |
|
1117
Fidelity Nasdaq Composite Index ETF
ONEQ
$10.9B
| $451K | ﹤0.01% |
5,633
+720
| +15% | +$51.9K |
|
1118
Encore Capital Group
ECPG
$2.13B
| $450K | ﹤0.01% |
11,637
-4,315
| -27% | -$156K |
|
1119
FTAI Aviation
FTAI
$22.2B
| $450K | ﹤0.01% |
3,909
-864
| -18% | -$96.6K |
|
1120
iShares MBS ETF
MBB
$39.1B
| $449K | ﹤0.01% |
4,780
-2,010
| -30% | -$186K |
|
1121
Unum
UNM
$14.3B
| $447K | ﹤0.01% |
5,539
+531
| +11% | +$41.9K |
|
1122
JPMorgan Municipal ETF
JMUB
$8.47B
| $447K | ﹤0.01% |
9,000
+1,000
| +13% | +$49.4K |
|
1123
Aecom
ACM
$9.75B
| $446K | ﹤0.01% |
+3,956
| New | +$411K |
|
|
SF
1124
Stifel
SF
$12.6B
| $446K | ﹤0.01% |
6,449
+2,964
| +85% | +$182K |
|
1125
First Financial Corp
THFF
$969M
| $445K | ﹤0.01% |
8,220
| – | – |
|
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William Blair & Company's Q2 2025 Portfolio in Review
As of Q2 2025, William Blair & Company held 1,911 positions worth $36B, up 8.6% from $33.2B the previous quarter. Its ten largest holdings account for 25% of the portfolio.
William Blair & Company's Q2 2025 filing shows 111 new, 662 increased, 757 reduced and 87 closed positions. Its largest new stake was Affirm: 304,959 shares worth $21.1M. The largest sale was Block Inc, an estimated $79.4M.
By sector, the portfolio is most concentrated in Technology at 27% of assets, up from 26% a quarter earlier, followed by Financials and Industrials.
- William Blair & Company's largest Q2 2025 buy was Affirm: 304,959 shares worth $21.1M.
- William Blair & Company added most to GE Vernova in Q2 2025, an estimated $116M increase.
- William Blair & Company's biggest Q2 2025 reduction was Block Inc, cutting an estimated $79.4M.
- William Blair & Company fully exited Discover Financial Services in Q2 2025, selling an estimated $5.21M.
- William Blair & Company's ten largest holdings make up 25% of its $36B portfolio in Q2 2025.
- William Blair & Company opened 111 new positions and closed 87 in Q2 2025.
- William Blair & Company's portfolio value rose 8.6% quarter-over-quarter to $36B.
Based on William Blair & Company's 13F filing for Q2 2025, filed 24 Jul 2025.