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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 | |
|---|---|---|---|---|---|---|
776
State Street SPDR Portfolio S&P 600 Small Cap ETF
SPSM
$17.6B
| $1.68M | ﹤0.01% |
36,286
+554
| +2% | +$24.8K |
|
777
PIMCO Enhanced Short Maturity Active Exchange-Traded Fund
MINT
$17.1B
| $1.66M | ﹤0.01% |
16,513
-400
| -2% | -$40.2K |
|
778
Toll Brothers
TOL
$13.9B
| $1.66M | ﹤0.01% |
12,036
-1,979
| -14% | -$258K |
|
779
Twist Bioscience
TWST
$7.83B
| $1.66M | ﹤0.01% |
59,079
-642
| -1% | -$19.4K |
|
|
ZAP
780
Global X U.S. Electrification ETF
ZAP
$474M
| $1.66M | ﹤0.01% |
56,189
+50,502
| +888% | +$1.41M |
|
781
Cellebrite
CLBT
$2.65B
| $1.66M | ﹤0.01% |
89,425
+3,398
| +4% | +$53.4K |
|
782
iShares MSCI Canada ETF
EWC
$6.54B
| $1.65M | ﹤0.01% |
32,656
-4,705
| -13% | -$225K |
|
783
iShares US Financials ETF
IYF
$4.44B
| $1.65M | ﹤0.01% |
13,018
+6
| +0% | +$742 |
|
784
Sony
SONY
$138B
| $1.64M | ﹤0.01% |
56,923
-286
| -0.5% | -$7.69K |
|
785
Sprout Social
SPT
$605M
| $1.64M | ﹤0.01% |
126,785
-25,517
| -17% | -$417K |
|
786
Eaton Vance Tax-Managed Global Diversified Equity Income Fund
EXG
$3.1B
| $1.64M | ﹤0.01% |
179,975
-17,000
| -9% | -$151K |
|
787
VSE Corp
VSEC
$6.51B
| $1.63M | ﹤0.01% |
9,805
+61
| +0.6% | +$9.3K |
|
788
Vanguard Total Bond Market
BND
$161B
| $1.61M | ﹤0.01% |
21,625
+28
| +0.1% | +$2.06K |
|
|
THR
789
DELISTED
Thermon Group Holdings
THR
| $1.61M | ﹤0.01% |
60,102
-46,535
| -44% | -$1.25M |
|
790
Glaukos
GKOS
$11.1B
| $1.59M | ﹤0.01% |
19,509
-27,741
| -59% | -$2.55M |
|
791
Vanguard Morningstar Large-Cap ETF
VV
$54.9B
| $1.59M | ﹤0.01% |
5,164
-1
| -0% | -$296 |
|
792
Erie Indemnity
ERIE
$13.5B
| $1.58M | ﹤0.01% |
4,982
-8
| -0.2% | -$2.76K |
|
793
Innovator US Equity Power Buffer ETF March
PMAR
$771M
| $1.58M | ﹤0.01% |
35,895
| – | – |
|
794
Alkami Technology
ALKT
$2.22B
| $1.57M | ﹤0.01% |
63,192
+51,398
| +436% | +$1.31M |
|
|
QXO
795
QXO Inc
QXO
$16.1B
| $1.56M | ﹤0.01% |
82,015
+9,909
| +14% | +$205K |
|
796
CF Industries
CF
$17.6B
| $1.56M | ﹤0.01% |
17,412
-9,008
| -34% | -$803K |
|
797
Invesco S&P 500 Equal Weight Technology ETF
RSPT
$6.05B
| $1.55M | ﹤0.01% |
34,881
| – | – |
|
798
Brookfield Asset Management
BAM
$89.3B
| $1.55M | ﹤0.01% |
27,262
-1,833
| -6% | -$109K |
|
799
Clorox
CLX
$13B
| $1.54M | ﹤0.01% |
12,492
+3,222
| +35% | +$400K |
|
800
Vanguard International High Dividend Yield ETF
VYMI
$21.3B
| $1.54M | ﹤0.01% |
18,182
+301
| +2% | +$24.9K |
|
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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.