SEC 13F filing
Altarock Partners 13F portfolio — Q2 2026
Altarock Partners reported $4.24B across its 8 reported positions in its SEC Form 13F-HR for the quarter ended 2026-06-30, with AMAZON COM INC the largest at $1.37B (32.21% of reported value). 13F positions are as of quarter-end and filed up to 45 days later — they are not current positions.
Definition
A 13F filing is a quarterly SEC disclosure required of institutional investment managers with at least $100M in US-listed equity assets. It lists the manager's long US equity positions as of quarter-end and must be filed within 45 days of that date. Source: SEC EDGAR Form 13F-HR.
Altarock Partners holdings — Q2 2026
| # | Holding | Ticker | Shares | Value | % of reported | Δ shares vs Q1 2026 |
|---|---|---|---|---|---|---|
| 1 | AMAZON COM INC | AMZN | 5,729,972 | $1.37B | 32.21% | −1,837,974 |
| 2 | TRANSDIGM GROUP INC | TDG | 875,755 | $1.17B | 27.51% | −33,413 |
| 3 | MICROSOFT CORP | MSFT | 2,334,482 | $870.8M | 20.54% | +466,945 |
| 4 | MASTERCARD INCORPORATED | MA | 764,507 | $392.7M | 9.26% | +241,671 |
| 5 | VISA INC | V | 836,470 | $287.0M | 6.77% | +337,793 |
| 6 | MOODYS CORP | MCO | 302,624 | $137.1M | 3.23% | −559,412 |
| 7 | ALPHABET INC | GOOGL | 41,994 | $15.0M | 0.35% | −1,397 |
| 8 | HILTON WORLDWIDE HLDGS INC | HLT | 15,202 | $5.0M | 0.12% | −139 |
Disclosures shown are public regulatory filings. Data may be delayed or incomplete. Smart-money entities may no longer hold positions shown. Not investment advice.
Changes vs Q1 2026
Share-count changes between the Q1 2026 and Q2 2026 filings, matched position by position. Value deltas include the quarter's price move, so rankings key on share changes first.
Largest increases
- MICROSOFT CORP+466,945 sh · +$179.5M
- VISA INC+337,793 sh · +$136.3M
- MASTERCARD INCORPORATED+241,671 sh · +$131.4M
Largest decreases
- MOODYS CORP−559,412 sh · −$239.0M
- AMAZON COM INC−1,837,974 sh · −$210.5M
- HILTON WORLDWIDE HLDGS INC−139 sh · +$358.8K
- ALPHABET INC−1,397 sh · +$2.5M
- TRANSDIGM GROUP INC−33,413 sh · +$112.9M
Disclosures shown are public regulatory filings. Data may be delayed or incomplete. Smart-money entities may no longer hold positions shown. Not investment advice.
Altarock Partners 13F filing history
| Quarter | Quarter end | Positions stored | Reported value |
|---|---|---|---|
| Q2 2026 | 2026-06-30 | 8 | $4.24B |
| Q1 2026 | 2026-03-31 | 8 | $4.13B |
| Q4 2025 | 2025-12-31 | 8 | $5.10B |
| Q3 2025 | 2025-09-30 | 9 | $5.47B |
| Q2 2025 | 2025-06-30 | 9 | $5.48B |
Related on Flock
- All tracked 13F filers (browse every fund by name)
- Stocks the most 13F filers added last quarter
- The largest single 13F position increases
- What is a 13F filing? (how the disclosure works, and its limits)
- NSE shareholding patterns (the India equivalent: quarterly ownership filings)
Frequently asked questions
What is Altarock Partners's largest 13F holding?
AMAZON COM INC was Altarock Partners's largest reported position for the quarter ended 2026-06-30, valued at $1.37B — 32.21% of the $4.24B in reported holdings. Figures come from the fund's SEC Form 13F-HR. Not investment advice.
How many positions did Altarock Partners report for Q2 2026?
Altarock Partners reported 8 US-listed positions worth $4.24B in its 13F filing for the quarter ended 2026-06-30.
Which quarter does Altarock Partners's 13F data here cover?
Flock's coverage of Altarock Partners runs through the quarter ended 2026-06-30. SEC rules give institutional managers up to 45 days after quarter-end to file Form 13F-HR, so the disclosure became public after that date. Positions are as of the quarter-end, not current positions.
What did Altarock Partners add in Q2 2026?
Versus its prior stored quarter (Q1 2026), Altarock Partners's Q2 2026 13F shows share-count increases or newly reported positions including MICROSOFT CORP, VISA INC, MASTERCARD INCORPORATED. The quarter-over-quarter tables on this page list the largest changes with share and value deltas. Not investment advice.
What is a 13F filing?
Form 13F-HR is a quarterly SEC disclosure required of institutional investment managers with at least $100M in US-listed equity assets. It lists the manager's long US equity positions as of quarter-end and must be filed within 45 days of that date. It excludes shorts, most bonds, and non-US listings.
How current is this data?
13F positions are as of quarter-end and filed up to 45 days later, so they are never current positions. Flock's coverage of Altarock Partners runs through the quarter ended 2026-06-30. Flock re-checks SEC EDGAR daily and re-stamps this page when a new quarterly filing lands.
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