CIK: 0001631014
Total reported value
$4.1B
Reporting period: 2026-03-31 · Number of holdings: 8
ALTAROCK PARTNERS LP disclosed 8 holdings in its latest 13F filing for the period ending 2026-03-31, with total reported value of $4.1B and a quarterly turnover rate of 21.1%.
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Altarock Partners LP's disclosed holdings carry a Herfindahl concentration index of 0.253 — mathematically equivalent to about 4 equally-sized positions, well below its 8 actual disclosed holdings. That gap points to a strategy built around a small core of high-conviction bets rather than broad diversification.
Position sizes are fairly uniform across the portfolio (a coefficient of variation of 1.08), suggesting a disciplined, rules-based approach to how much capital goes into each idea.
Recent activity leans toward adding more aggressively to already-large existing positions than to newly initiated ones (a 20.6 percentage-point tilt) — a pattern consistent with a momentum-following approach.
Add AMZN
+3.5% -$112.2M
Trim MSFT
-10.3% -$315.8M
Trim HLT
-97.2% -$151.2M
Add MCO
+5.8% -$40.0M
Trim GOOGL
-74.4% -$40.5M
Add TDG
-6.2% -$235.5M
| # | Ticker | Issuer | Asset Subclass | Weight | Weight Change | Shares Change | 4Q Trend |
|---|---|---|---|---|---|---|---|
| 1 | AMZN | Amazon.com INC | Stock-Consumer Disc | 38.20% | +5.10% | +3.46% | |
| 2 | TDG | Transdigm Group INC | Stock-Industrials | 25.54% | +0.26% | -6.21% | |
| 3 | MSFT | Microsoft CORP | Stock-Tech | 16.75% | -3.00% | -10.32% | |
| 4 | MCO | Moody's CORP | Stock-Financials | 9.11% | +0.95% | +5.84% | |
| 5 | MA | Mastercard INC - A | Stock-Financials | 6.33% | +0.26% | -3.51% | |
| 6 | V | Visa Inc-class A Shares | Stock-Financials | 3.65% | +0.10% | -3.48% | |
| 7 | GOOGL | Alphabet Inc-cl A | Stock-Comm Services | 0.30% | -0.74% | -74.38% | |
| 8 | HLT | Hilton Worldwide Holdings In | Stock-Consumer Disc | 0.11% | -2.95% | -97.17% |
Performance for Q3 2026
-0.2%
Performance Last 4 Quarters
+1%
Based on 83% of reported portfolio value with available pricing
| Period | Holdings | Total value | Stability | Top holdings |
|---|---|---|---|---|
| 2026-03-31 | 8 | $4.1B | 21 | |
| 2025-12-31 | 8 | $5.1B | 9 | |
| 2025-09-30 | 9 | $5.5B | 32 | |
| 2025-06-30 | 9 | $5.5B | 0 | |
| 2025-03-31 | 9 | $5.0B | 100 | |
| 2024-12-31 | 10 | $4.9B | 0 | |
| 2024-09-30 | 9 | $5.1B | 0 | |
| 2024-06-30 | 9 | $4.9B | 0 | |
| 2024-03-31 | 8 | $4.7B | 0 | |
| 2023-12-31 | 8 | $4.5B | 0 | |
| 2023-09-30 | 8 | $4.0B | 0 | |
| 2023-06-30 | 8 | $4.2B | 0 | |
| 2023-03-31 | 8 | $3.7B | 0 | |
| 2022-12-31 | 8 | $3.2B | 0 | |
| 2022-09-30 | 8 | $3.1B | 0 | |
| 2022-06-30 | 8 | $3.2B | 0 | |
| 2022-03-31 | 9 | $3.9B | 0 | |
| 2021-12-31 | 8 | $3.8B | 0 | |
| 2021-09-30 | 8 | $3.7B | 0 | |
| 2021-06-30 | 8 | $3.6B | 84 | |
| 2021-03-31 | 7 | $2.6B | 16 | |
| 2020-12-31 | 7 | $2.4B | 37 | |
| 2020-09-30 | 6 | $2.1B | 9 | |
| 2020-06-30 | 6 | $2.0B | 38 | |
| 2020-03-31 | 6 | $1.6B | 15 | |
| 2019-12-31 | 7 | $1.6B | 33 | |
| 2019-09-30 | 6 | $1.2B | 15 | |
| 2019-06-30 | 6 | $1.2B | 11 | |
| 2019-03-31 | 6 | $1.1B | 22 | |
| 2018-12-31 | 6 | $840.3M | 30 | |
| 2018-09-30 | 7 | $1.1B | 12 | |
| 2018-06-30 | 7 | $967.2M | 23 | |
| 2018-03-31 | 7 | $873.9M | 54 | |
| 2017-12-31 | 7 | $761.3M | 15 | |
| 2017-09-30 | 7 | $683.9M | 16 | |
| 2017-06-30 | 7 | $710.1M | 18 | |
| 2017-03-31 | 8 | $674.2M | 22 | |
| 2016-12-31 | 8 | $682.4M | 28 | |
| 2016-09-30 | 8 | $627.9M | 29 | |
| 2016-06-30 | 9 | $550.5M | 65 | |
| 2016-03-31 | 8 | $542.5M | 10 | |
| 2015-12-31 | 8 | $491.9M | 16 | |
| 2015-09-30 | 8 | $419.5M | 30 | |
| 2015-06-30 | 7 | $313.5M | 47 | |
| 2015-03-31 | 6 | $200.1M | 58 | |
| 2014-12-31 | 6 | $120.9M | 0 |
Altarock Partners LP's most significant position changes for 2026-03-31: Add: Amazon.com INC (AMZN) — shares +3.46%; Trim: Microsoft CORP (MSFT) — shares -10.32%; Trim: Hilton Worldwide Holdings In (HLT) — shares -97.17%; Add: Moody's CORP (MCO) — shares +5.84%; Trim: Alphabet Inc-cl A (GOOGL) — shares -74.38%.
| # | Ticker | Issuer | Weight Change | Shares Change | Action |
|---|---|---|---|---|---|
| 1 | AMZN | Amazon.com INC | +5.1% | +3.46% | Add |
| 2 | MCO | Moody's CORP | +1% | +5.84% | Add |
| 3 | TDG | Transdigm Group INC | +0.3% | -6.21% | Trim |
| 4 | MA | Mastercard INC - A | +0.3% | -3.51% | Trim |
| 5 | V | Visa Inc-class A Shares | +0.1% | -3.48% | Trim |
| 6 | GOOGL | Alphabet Inc-cl A | -0.7% | -74.38% | Trim |
| 7 | HLT | Hilton Worldwide Holdings In | -3% | -97.17% | Trim |
| 8 | MSFT | Microsoft CORP | -3% | -10.32% | Trim |
| Period | Filed | Type | EDGAR |
|---|---|---|---|
| 2026-03-31 | 2026-05-15 | 13F-HR | View on EDGAR |
| 2025-12-31 | 2026-02-13 | 13F-HR | View on EDGAR |
| 2025-09-30 | 2025-11-14 | 13F-HR | View on EDGAR |
| 2025-06-30 | 2025-08-14 | 13F-HR | View on EDGAR |
| 2025-03-31 | 2025-05-14 | 13F-HR | View on EDGAR |
| 2024-12-31 | 2025-02-14 | 13F-HR | View on EDGAR |
| 2024-09-30 | 2024-11-13 | 13F-HR | View on EDGAR |
| 2024-06-30 | 2024-08-14 | 13F-HR | View on EDGAR |
| 2024-03-31 | 2024-05-21 | Amendment | View on EDGAR |
| 2024-03-31 | 2024-05-15 | 13F-HR | View on EDGAR |
| 2023-12-31 | 2024-02-15 | 13F-HR | View on EDGAR |
| 2023-09-30 | 2023-11-14 | 13F-HR | View on EDGAR |
| 2023-06-30 | 2023-08-14 | 13F-HR | View on EDGAR |
| 2023-03-31 | 2023-05-16 | 13F-HR | View on EDGAR |
| 2022-12-31 | 2023-02-13 | 13F-HR | View on EDGAR |
| 2022-09-30 | 2022-11-14 | 13F-HR | View on EDGAR |
| 2022-06-30 | 2022-08-12 | 13F-HR | View on EDGAR |
| 2022-03-31 | 2022-05-13 | 13F-HR | View on EDGAR |
| 2021-12-31 | 2022-02-14 | 13F-HR | View on EDGAR |
| 2021-09-30 | 2021-11-15 | 13F-HR | View on EDGAR |
| 2021-06-30 | 2021-08-13 | 13F-HR | View on EDGAR |
| 2021-03-31 | 2021-05-14 | 13F-HR | View on EDGAR |
| 2020-12-31 | 2021-02-16 | 13F-HR | View on EDGAR |
| 2020-09-30 | 2020-11-13 | 13F-HR | View on EDGAR |
| 2020-06-30 | 2020-08-13 | 13F-HR | View on EDGAR |
| 2020-03-31 | 2020-05-13 | 13F-HR | View on EDGAR |
| 2019-12-31 | 2020-02-13 | 13F-HR | View on EDGAR |
| 2019-09-30 | 2019-11-15 | 13F-HR | View on EDGAR |
| 2019-06-30 | 2019-08-14 | 13F-HR | View on EDGAR |
| 2019-03-31 | 2019-05-14 | 13F-HR | View on EDGAR |
| 2018-12-31 | 2019-02-14 | 13F-HR | View on EDGAR |
| 2018-09-30 | 2018-11-13 | 13F-HR | View on EDGAR |
| 2018-06-30 | 2018-08-13 | 13F-HR | View on EDGAR |
| 2018-03-31 | 2018-05-14 | 13F-HR | View on EDGAR |
| 2017-12-31 | 2018-02-13 | 13F-HR | View on EDGAR |
| 2017-09-30 | 2017-11-14 | 13F-HR | View on EDGAR |
| 2017-06-30 | 2017-08-11 | 13F-HR | View on EDGAR |
| 2017-03-31 | 2017-05-15 | 13F-HR | View on EDGAR |
| 2016-12-31 | 2017-02-14 | 13F-HR | View on EDGAR |
| 2016-09-30 | 2016-11-14 | 13F-HR | View on EDGAR |
| 2016-06-30 | 2016-08-15 | 13F-HR | View on EDGAR |
| 2016-03-31 | 2016-05-13 | 13F-HR | View on EDGAR |
| 2015-12-31 | 2016-02-08 | 13F-HR | View on EDGAR |
| 2015-09-30 | 2015-11-12 | 13F-HR | View on EDGAR |
| 2015-06-30 | 2015-08-14 | 13F-HR | View on EDGAR |
| 2015-03-31 | 2015-05-14 | 13F-HR | View on EDGAR |
| 2014-12-31 | 2015-02-17 | 13F-HR | View on EDGAR |
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