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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 | |
|---|---|---|---|---|---|---|
551
GitLab
GTLB
$6.8B
| $4.46M | 0.01% |
98,926
-14,819
| -13% | -$678K |
|
552
Williams Companies
WMB
$89.8B
| $4.42M | 0.01% |
69,740
+7,737
| +12% | +$454K |
|
553
BlackLine
BL
$1.67B
| $4.42M | 0.01% |
83,161
-2,823
| -3% | -$153K |
|
554
Sweetgreen
SG
$702M
| $4.4M | 0.01% |
551,522
-605,883
| -52% | -$6.59M |
|
555
Evercore
EVR
$11.6B
| $4.36M | 0.01% |
12,937
-178
| -1% | -$55.8K |
|
556
Pultegroup
PHM
$24.8B
| $4.36M | 0.01% |
32,993
+30
| +0.1% | +$3.73K |
|
557
ITT
ITT
$19.2B
| $4.34M | 0.01% |
24,270
-3,113
| -11% | -$522K |
|
558
Align Technology
ALGN
$12.3B
| $4.33M | 0.01% |
34,595
-384
| -1% | -$60.1K |
|
559
Leidos
LDOS
$17.7B
| $4.32M | 0.01% |
22,848
-93
| -0.4% | -$16.2K |
|
560
Vistra
VST
$48.9B
| $4.32M | 0.01% |
22,033
+9,404
| +74% | +$1.86M |
|
561
PAR Technology
PAR
$740M
| $4.29M | 0.01% |
108,312
-9,146
| -8% | -$505K |
|
|
KDEC
562
Innovator U.S. Small Cap Power Buffer ETF - December
KDEC
$73.6M
| $4.25M | 0.01% |
166,832
-769
| -0.5% | -$19.1K |
|
563
State Street SPDR S&P Regional Banking ETF
KRE
$4.67B
| $4.23M | 0.01% |
66,817
+3,066
| +5% | +$193K |
|
564
iShares MSCI Japan ETF
EWJ
$23.2B
| $4.23M | 0.01% |
52,686
+21,124
| +67% | +$1.63M |
|
565
Baidu
BIDU
$35.2B
| $4.22M | 0.01% |
32,025
+583
| +2% | +$57.7K |
|
566
Icon
ICLR
$12.8B
| $4.2M | 0.01% |
24,010
+836
| +4% | +$140K |
|
567
Schwab International Equity ETF
SCHF
$69.3B
| $4.18M | 0.01% |
179,568
-24,883
| -12% | -$562K |
|
568
Casey's General Stores
CASY
$31.5B
| $4.14M | 0.01% |
7,315
+62
| +0.9% | +$32.4K |
|
569
iShares National Muni Bond ETF
MUB
$45.9B
| $4.11M | 0.01% |
38,616
+432
| +1% | +$45.2K |
|
570
Medpace
MEDP
$16.4B
| $4.1M | 0.01% |
7,977
-292
| -4% | -$127K |
|
571
Autodesk
ADSK
$51.4B
| $4.01M | 0.01% |
12,630
+1,509
| +14% | +$460K |
|
572
State Street SPDR Portfolio Intermediate Term Corporate Bond ETF
SPIB
$11.6B
| $4.01M | 0.01% |
118,266
+8,678
| +8% | +$292K |
|
573
KKR & Co
KKR
$101B
| $4M | 0.01% |
30,787
+501
| +2% | +$71.1K |
|
574
Innovator US Equity Power Buffer ETF June
PJUN
$978M
| $4M | 0.01% |
97,097
-740
| -0.8% | -$29.9K |
|
575
Hamilton Lane
HLNE
$5.72B
| $3.99M | 0.01% |
29,599
+305
| +1% | +$46K |
|
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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.