Q2 2026 13F · SEC CIK 1631014
Altarock Partners LP
Hedge fundFiled 2026-08-17 for Q2 2026. Open the filing ↗ · All SEC filings ↗
- Reported 13F value
- $4.2B
- Reported positions
- 8
- Top holdings a year, 3 yrs
- +16.8%
- Assets under management
- $5.7B
Altarock Partners LP is a hedge fund that reported 8 positions worth $4.2B in its Q2 2026 13F, filed 2026-08-17. Its largest holdings were Amazon Com Inc (AMZN, 32.2%), Transdigm Group Inc (TDG, 27.5%), Microsoft Corp (MSFT, 20.5%). A portfolio copying its top holdings returned 16.8% a year over the last 3 years, against 20.4% for the S&P 500.
Altarock Partners LP holdings all 8 positions.
Weights are shares of the filer's total reported 13F value, compared with Q1 2026. Share changes may reflect splits; weight changes also reflect price moves. A 13F shows long US-listed positions only, up to 135 days after the fact.
| Stock | % of 13F value | Share change | Reported value |
|---|---|---|---|
| AMZNAmazon Com Inc | 32.2% | -24.3% | $1.4B |
| TDGTransdigm Group Inc | 27.5% | -3.7% | $1.2B |
| MSFTMicrosoft Corp | 20.5% | +25.0% | $870.8M |
| MAMastercard Incorporated | 9.3% | +46.2% | $392.7M |
| VVisa Inc | 6.8% | +67.7% | $287.0M |
| MCOMoodys Corp | 3.2% | -64.9% | $137.1M |
| GOOGLAlphabet Inc | 0.4% | -3.2% | $15.0M |
| HLTHilton Worldwide Hldgs Inc | 0.1% | -0.9% | $5.0M |
What Altarock Partners LP bought and sold in Q2 2026, against Q1 2026.
New positions
No new positions among the largest holdings.
Added to
- V Visa Inc+67.7% shares
- MA Mastercard Incorporated+46.2% shares
- MSFT Microsoft Corp+25.0% shares
Reduced
- MCO Moodys Corp-64.9% shares
- AMZN Amazon Com Inc-24.3% shares
Sold out
Nothing sold out.
Share counts compared with the Q1 2026 13F; a split also changes share counts.
How the holdings did against the S&P 500.
- 1 year
- +1.6% /yr
- S&P 500 +20.1%
- 3 years
- +16.8% /yr
- S&P 500 +20.4%
- 5 years
- +8.0% /yr
- S&P 500 +11.6%
A portfolio of the filer's 20 largest 13F positions, weighted by value, bought the trading day after each 13F was filed and held until the next one was: what copying this filer could have earned. 13Fs show long US-listed positions only, so this is an estimate of the stock picks, not the fund's reported returns.
Reported 13F value by quarter.
| Quarter | 13F value | Positions |
|---|---|---|
| Q2 2026 | $4.2B | 8 |
| Q1 2026 | $4.1B | 8 |
| Q4 2025 | $5.1B | 8 |
| Q3 2025 | $5.5B | 9 |
| Q2 2025 | $5.5B | 9 |
| Q1 2025 | $5.0B | 9 |
| Q4 2024 | $4.9B | 10 |
| Q3 2024 | $5.1B | 9 |
| Q2 2024 | $4.9B | 9 |
| Q1 2024 | $4.7B | 8 |
| Q4 2023 | $4.5B | 8 |
| Q3 2023 | $4.0B | 8 |
Questions about Altarock Partners LP's portfolio
What stocks does Altarock Partners LP own?
Altarock Partners LP's latest 13F, for Q2 2026 and filed Aug 17, 2026, lists 8 positions worth $4.2B. The largest are Amazon Com Inc (AMZN) at 32.2%, Transdigm Group Inc (TDG) at 27.5%, Microsoft Corp (MSFT) at 20.5%, Mastercard Incorporated (MA) at 9.3% and Visa Inc (V) at 6.8%.
What did Altarock Partners LP buy last quarter?
In Q2 2026, Altarock Partners LP added Visa Inc (V) (+67.7% shares), Mastercard Incorporated (MA) (+46.2% shares) and Microsoft Corp (MSFT) (+25.0% shares), compared with its Q1 2026 filing.
What did Altarock Partners LP sell last quarter?
In Q2 2026, Altarock Partners LP Moodys Corp (MCO) (-64.9% shares) and Amazon Com Inc (AMZN) (-24.3% shares), compared with its Q1 2026 filing.
How has Altarock Partners LP's portfolio performed?
A portfolio copying Altarock Partners LP's 20 largest 13F holdings each quarter, from the day each filing was public, returned +16.8% a year over the last 3 years, against +20.4% for the S&P 500. Over 1 year: +1.6% against +20.1%. Over 5 years: +8.0% a year against +11.6%.
When is Altarock Partners LP's next 13F filing due?
13F filings are due 45 days after each quarter ends. Altarock Partners LP's filing for the quarter ending Sep 30, 2026 is due by Nov 14, 2026; this page updates the day after it is published.
How much money does Altarock Partners LP manage?
Altarock Partners LP reported $5.7B of regulatory assets under management on its latest SEC Form ADV. Its 13F, which covers only US-listed stocks and options, totals $4.2B.