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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 | |
|---|---|---|---|---|---|---|
826
ARK Innovation ETF
ARKK
$6.54B
| $1.44M | ﹤0.01% |
16,717
-9,704
| -37% | -$742K |
|
827
State Street SPDR Dow Jones Global Real Estate ETF
RWO
$1.29B
| $1.44M | ﹤0.01% |
31,493
-3,334
| -10% | -$149K |
|
828
Kraft Heinz
KHC
$30.1B
| $1.43M | ﹤0.01% |
55,034
-14,165
| -20% | -$385K |
|
829
Johnson Controls International
JCI
$91.7B
| $1.42M | ﹤0.01% |
12,888
-436
| -3% | -$46.6K |
|
830
Innovator US Equity Buffer ETF July
BJUL
$355M
| $1.42M | ﹤0.01% |
28,530
+614
| +2% | +$29.7K |
|
831
Delta Air Lines
DAL
$60B
| $1.41M | ﹤0.01% |
24,796
+1,168
| +5% | +$66.7K |
|
832
First Trust NASDAQ-100 Technology Index Fund
QTEC
$4.92B
| $1.41M | ﹤0.01% |
6,124
+138
| +2% | +$29.9K |
|
833
Tenable Holdings
TENB
$4.41B
| $1.39M | ﹤0.01% |
47,510
-106,200
| -69% | -$3.32M |
|
834
Darden Restaurants
DRI
$25.4B
| $1.37M | ﹤0.01% |
7,215
-92
| -1% | -$18.9K |
|
835
VanEck Junior Gold Miners ETF
GDXJ
$8.33B
| $1.37M | ﹤0.01% |
13,860
| – | – |
|
836
Global X MLP ETF
MLPA
$2.28B
| $1.36M | ﹤0.01% |
28,123
-87
| -0.3% | -$4.33K |
|
837
IQVIA
IQV
$39.8B
| $1.36M | ﹤0.01% |
7,151
+502
| +8% | +$91.3K |
|
838
Rio Tinto
RIO
$160B
| $1.36M | ﹤0.01% |
20,563
+4,110
| +25% | +$254K |
|
839
American International
AIG
$39.8B
| $1.36M | ﹤0.01% |
17,273
-50
| -0.3% | -$4K |
|
840
Weyerhaeuser
WY
$17.9B
| $1.36M | ﹤0.01% |
54,663
-16,567
| -23% | -$424K |
|
841
Vanguard S&P 500 Growth ETF
VOOG
$27.4B
| $1.35M | ﹤0.01% |
18,558
+162
| +0.9% | +$11.2K |
|
842
Leonardo DRS
DRS
$11.9B
| $1.35M | ﹤0.01% |
29,656
-1,855
| -6% | -$80.8K |
|
843
Hewlett Packard
HPE
$79.2B
| $1.34M | ﹤0.01% |
54,633
+3,810
| +7% | +$84.2K |
|
844
American Public Education
APEI
$828M
| $1.34M | ﹤0.01% |
+33,971
| New | +$1.08M |
|
845
iShares MSCI Emerging Markets Asia ETF
EEMA
$871M
| $1.34M | ﹤0.01% |
14,571
-29
| -0.2% | -$2.5K |
|
846
JPMorgan BetaBuilders Canada ETF
BBCA
$11.4B
| $1.34M | ﹤0.01% |
15,314
+11
| +0.1% | +$917 |
|
847
Rocket Companies
RKT
$42.6B
| $1.34M | ﹤0.01% |
+68,886
| New | +$1.2M |
|
848
Core Scientific Inc Tranche 1 Warrants
CORZW
$1.29B
| $1.33M | ﹤0.01% |
114,509
| – | – |
|
849
Graco
GGG
$13.3B
| $1.32M | ﹤0.01% |
15,481
+30
| +0.2% | +$2.57K |
|
850
iShares iBoxx $ Investment Grade Corporate Bond ETF
LQD
$32.8B
| $1.31M | ﹤0.01% |
11,761
-640
| -5% | -$70.4K |
|
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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.