Altarock Partners Portfolio holdings
AltaRock Partners runs private funds that put money into a limited group of companies it judges to be undervalued, holding them for the long term. Its portfolios are expected to be highly concentrated in a few companies. Mark Massey, the firm's chief investment officer and principal owner, founded its predecessor, AltaRock Partners, LLC, in 2002, and the current partnership took over the business with no change in personnel or control. The funds are open to qualified investors such as high net worth individuals, family offices, endowments and charities.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Microsoft
MSFT
|
+$142M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$230M |
| 2 |
Moody's
MCO
|
+$82.3M |
| 3 |
TransDigm Group
TDG
|
+$39.1M |
| 4 |
Mastercard
MA
|
+$34M |
| 5 |
Visa
V
|
+$24.4M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 32.15% |
| 2 | Consumer Discretionary | 28.65% |
| 3 | Industrials | 21.67% |
| 4 | Financials | 17.21% |
| 5 | Communication Services | 0.32% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
|
1
Microsoft
MSFT
$3.89T
| $1.35B | 32.15% |
2,641,022
+306,540
| +13% | +$142M |
2021 Q2
21 quarters
|
|
|
2
Amazon
AMZN
$2.88T
| $1.2B | 28.53% |
4,824,972
-905,000
| -16% | -$230M |
2022 Q1
18 quarters
|
|
|
3
TransDigm Group
TDG
$66.5B
| $913M | 21.67% |
843,256
-32,499
| -4% | -$39.1M |
2014 Q4
47 quarters
|
|
|
4
Mastercard
MA
$576B
| $388M | 9.21% |
704,026
-60,481
| -8% | -$34M |
2014 Q4
47 quarters
|
|
|
5
Visa
V
$794B
| $277M | 6.56% |
769,712
-66,758
| -8% | -$24.4M |
2014 Q4
47 quarters
|
|
|
6
Moody's
MCO
$87.6B
| $60.4M | 1.43% |
132,969
-169,655
| -56% | -$82.3M |
2014 Q4
47 quarters
|
|
7
Alphabet (Google) Class A
GOOGL
$3.64T
| $13.7M | 0.32% |
39,694
-2,300
| -5% | -$798K |
2019 Q4
27 quarters
|
|
8
Hilton Worldwide Holdings Inc. Common Stock
HLT
$83B
| $4.84M | 0.11% |
15,202
| – | – |
2024 Q4
7 quarters
|
|
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Altarock Partners's Q3 2026 Portfolio in Review
As of Q3 2026, Altarock Partners held 8 positions worth $4.21B, down 0.62% from $4.24B the previous quarter. Its ten largest holdings account for 100% of the portfolio.
Altarock Partners withdrew a net $269M in Q3 2026, reducing 6 holdings. Its largest reduction was Amazon, cutting an estimated $230M.
By sector, the portfolio is most concentrated in Technology at 32% of assets, up from 21% a quarter earlier, followed by Consumer Discretionary and Industrials.
Against the trend, Altarock Partners added an estimated $142M to Microsoft.
- Altarock Partners added most to Microsoft in Q3 2026, an estimated $142M increase.
- Altarock Partners's biggest Q3 2026 reduction was Amazon, cutting an estimated $230M.
- Altarock Partners's ten largest holdings make up 100% of its $4.21B portfolio in Q3 2026.
- Altarock Partners opened 0 new positions and closed 0 in Q3 2026.
- Altarock Partners's portfolio value fell 0.62% quarter-over-quarter to $4.21B.
Based on Altarock Partners's 13F filing for Q3 2026, filed 13 Nov 2026.