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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 | |
|---|---|---|---|---|---|---|
1151
State Street SPDR MSCI ACWI ex-US ETF
CWI
$2.88B
| $447K | ﹤0.01% |
12,800
+3,984
| +45% | +$133K |
|
|
BMNR
1152
BitMine Immersion Technologies
BMNR
$11B
| $444K | ﹤0.01% |
+8,556
| New | +$434K |
|
1153
Duluth Holdings
DLTH
$151M
| $444K | ﹤0.01% |
113,510
+16,678
| +17% | +$44.6K |
|
1154
iShares MSCI India ETF
INDA
$6.58B
| $442K | ﹤0.01% |
8,496
+30
| +0.4% | +$1.6K |
|
1155
First Community Corp
FCCO
$325M
| $441K | ﹤0.01% |
15,620
| – | – |
|
1156
Euronet Worldwide
EEFT
$2.78B
| $440K | ﹤0.01% |
5,007
-12
| -0.2% | -$1.15K |
|
1157
Lincoln Electric
LECO
$15.5B
| $439K | ﹤0.01% |
1,862
+523
| +39% | +$122K |
|
1158
Steris
STE
$23B
| $438K | ﹤0.01% |
1,771
-177
| -9% | -$42.4K |
|
1159
Corcept Therapeutics
CORT
$11.9B
| $438K | ﹤0.01% |
5,272
-33
| -0.6% | -$2.39K |
|
|
BCPC
1160
Balchem Corp
BCPC
$5.65B
| $437K | ﹤0.01% |
2,909
+5
| +0.2% | +$788 |
|
1161
Hayward Holdings
HAYW
$3.24B
| $436K | ﹤0.01% |
28,830
+2,381
| +9% | +$36.5K |
|
1162
Jack Henry & Associates
JKHY
$11.1B
| $436K | ﹤0.01% |
2,925
-93
| -3% | -$15.4K |
|
|
PPLT
1163
abrdn Physical Platinum Shares ETF
PPLT
$2B
| $435K | ﹤0.01% |
+30,480
| New | +$385K |
|
|
AII
1164
American Integrity Insurance
AII
$470M
| $435K | ﹤0.01% |
19,500
+5,720
| +42% | +$108K |
|
1165
Baker Hughes
BKR
$63B
| $435K | ﹤0.01% |
8,921
-166
| -2% | -$7.32K |
|
1166
Synchrony
SYF
$26.1B
| $435K | ﹤0.01% |
6,117
+12
| +0.2% | +$869 |
|
1167
Vanguard Global ex-US Real Estate ETF
VNQI
$3.52B
| $434K | ﹤0.01% |
9,085
-105
| -1% | -$4.92K |
|
1168
Goldman Sachs ActiveBeta US Large Cap Equity ETF
GSLC
$16.1B
| $432K | ﹤0.01% |
3,316
+91
| +3% | +$11.4K |
|
1169
Haleon
HLN
$43.2B
| $429K | ﹤0.01% |
47,834
+2,614
| +6% | +$25.2K |
|
1170
WisdomTree US MidCap Fund
EZM
$960M
| $429K | ﹤0.01% |
6,508
-300
| -4% | -$19.4K |
|
1171
Innovator US Equity Buffer ETF October
BOCT
$290M
| $429K | ﹤0.01% |
8,857
| – | – |
|
1172
Sea Limited
SE
$75.5B
| $428K | ﹤0.01% |
2,397
-276
| -10% | -$47.3K |
|
1173
JB Hunt Transport Services
JBHT
$26.5B
| $428K | ﹤0.01% |
3,191
-1,000
| -24% | -$144K |
|
1174
Invesco Senior Loan ETF
BKLN
$6.76B
| $428K | ﹤0.01% |
20,447
-666
| -3% | -$13.9K |
|
1175
Celestica
CLS
$43.8B
| $423K | ﹤0.01% |
+1,719
| New | +$347K |
|
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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.