ALTAROCK PARTNERS LP 13F: Portfolio & Holdings
This page tracks the 13F filings for ALTAROCK PARTNERS LP (SEC CIK 0001631014), a WEST PALM BEACH-based asset manager managing $4.10 billion across 8 reported positions as of Q1 2026, per its quarterly SEC Form 13F-HR filing. A breakdown of the Q1 2026 13F portfolio shows Consumer Cyclical as the manager's core pillar, accounting for 38.3% of the reported portfolio.
By portfolio weight, the top holdings are AMAZON COM INC (AMZN) at 38.20%, TRANSDIGM GROUP INC (TDG) at 25.54%, and MICROSOFT CORP (MSFT) at 16.75%. Ranked by the share of each peer fund's 13F equity portfolio that overlaps with AltaRock Partners's disclosed positions as of Q1 2026, the closest peers are Mastercard Foundation 13F (96.8%), Hengistbury Investment Partners 13F (70.6%), and Gray Foundation 13F (56.1% overlap).
Most recently, the manager added to MOODYS CORP (MCO) (+5.84% shares), and trimmed HILTON WORLDWIDE HOLDINGS INC (HLT) (-97.17% shares). View the full Q1 2026 allocation shift and trading report →
- 13F AUM
- $4.1B
- Equity Positions
- 8
- Top-10 Concentration
- 100.0%
- Largest Sector · 38.3%
- Consumer Cyclical
- Longest-Held Position · 41 qtrs
- MA
- Median Holding Period
- 6.5 Qtrs
Top 8 Holdings — AltaRock Partners — Q1 2026
Largest 13F positions disclosed by AltaRock Partners, ranked by portfolio weight. Full multi-quarter history and the broader institutional holder base for each ticker linked per row.
| # | Issuer | Ticker | Sector | Weight | Position Value | Detail |
|---|---|---|---|---|---|---|
| 1 | AMAZON COM INC | AMZN | Consumer Cyclical | 38.20% | $1.58B | Position History All Holders |
| 2 | TRANSDIGM GROUP INC | TDG | Industrials | 25.54% | $1.05B | Position History All Holders |
| 3 | MICROSOFT CORP | MSFT | Technology | 16.75% | $691.3M | Position History All Holders |
| 4 | MOODYS CORP | MCO | Financial Services | 9.11% | $376.1M | Position History All Holders |
| 5 | MASTERCARD INCORPORATED | MA | Financial Services | 6.33% | $261.2M | Position History All Holders |
| 6 | VISA INC | V | Financial Services | 3.65% | $150.7M | Position History All Holders |
| 7 | ALPHABET INC | GOOGL | Communication Services | 0.30% | $12.5M | Position History All Holders |
| 8 | HILTON WORLDWIDE HOLDINGS INC | HLT | Consumer Cyclical | 0.11% | $4.7M | Position History All Holders |
View AltaRock Partners's Q1 2026 allocation shift and trading report →
Portfolio composition
Sectors, concentrations, and a tap-through treemap of every position in the fund's latest 13F.
Quarterly shiftsQ1 2026 vs previous quarter
Top movers in AltaRock Partners's Form 13F versus the prior reporting quarter. Δ Weight is the change in portfolio weight (percentage points); Δ Shares is the percent change in share count.
| Company | Ticker | Δ Weight | Δ Shares |
|---|---|---|---|
| MOODYS CORP | MCO | +0.96% | +5.84% |
| AMAZON COM INC | AMZN | +5.09% | +3.46% |
| Company | Ticker | Δ Weight | Δ Shares |
|---|---|---|---|
| HILTON WORLDWIDE HOLDINGS INC | HLT | -2.94% | -97.17% |
| ALPHABET INC | GOOGL | -0.74% | -74.38% |
| MICROSOFT CORP | MSFT | -2.99% | -10.32% |
| TRANSDIGM GROUP INC | TDG | 0.26% | -6.21% |
| MASTERCARD INCORPORATED | MA | 0.27% | -3.51% |
| Company | Ticker | New weight |
|---|
| Company | Ticker | Prev weight |
|---|
Waterfall analysis
Top movers versus the prior reporting quarter. Left panel bridges market-value change in USD millions; right panel shows share-count change in %.
Holding period analytics
Distribution of holding periods for all 20 stocks the fund has ever held (up to selected quarter):
Which Funds Hold a Similar Portfolio to AltaRock Partners?
Ranked by percentage of the peer fund's 13F equity portfolio that overlaps with AltaRock Partners's positions in Q1 2026.
| # | Fund | Shared Positions | Overlap % |
|---|---|---|---|
| 1 | Mastercard Foundation 13F | 1 | 96.8% |
| 2 | Hengistbury Investment Partners 13F | 2 | 70.6% |
| 3 | Gray Foundation 13F | 1 | 56.1% |
| 4 | Triple Frond Partners 13F | 4 | 45.8% |
| 5 | Soroban Capital 13F | 6 | 45.4% |
How Has AltaRock Partners's AUM Changed Over Time?
Quarterly 13F-reported AUM for AltaRock Partners, derived from aggregate reported position market values disclosed to the U.S. SEC.
| Quarter | 13F AUM (USD) | QoQ Change |
|---|---|---|
| Q1 2016 | $543M | — |
| Q2 2016 | $550M | +0.01B |
| Q3 2016 | $628M | +0.08B |
| Q4 2016 | $682M | +0.05B |
| Q1 2017 | $674M | -0.01B |
| Q2 2017 | $710M | +0.04B |
| Q3 2017 | $684M | -0.03B |
| Q4 2017 | $761M | +0.08B |
| Q1 2018 | $874M | +0.11B |
| Q2 2018 | $967M | +0.09B |
| Q3 2018 | $1.1B | +0.12B |
| Q4 2018 | $840M | -0.25B |
| Q1 2019 | $1.1B | +0.21B |
| Q2 2019 | $1.2B | +0.11B |
| Q3 2019 | $1.2B | -0.01B |
| Q4 2019 | $1.6B | +0.46B |
| Q1 2020 | $1.6B | -0.04B |
| Q2 2020 | $2.0B | +0.38B |
| Q3 2020 | $2.1B | +0.17B |
| Q4 2020 | $2.4B | +0.27B |
| Q1 2021 | $2.6B | +0.24B |
| Q2 2021 | $3.6B | +0.98B |
| Q3 2021 | $3.7B | +0.09B |
| Q4 2021 | $3.8B | +0.09B |
| Q1 2022 | $3.9B | +0.13B |
| Q2 2022 | $3.2B | -0.68B |
| Q3 2022 | $3.1B | -0.19B |
| Q4 2022 | $3.2B | +0.13B |
| Q1 2023 | $3.7B | +0.47B |
| Q2 2023 | $4.2B | +0.51B |
| Q3 2023 | $4.0B | -0.17B |
| Q4 2023 | $4.5B | +0.49B |
| Q1 2024 | $4.7B | +0.17B |
| Q2 2024 | $4.9B | +0.21B |
| Q3 2024 | $5.1B | +0.22B |
| Q4 2024 | $4.9B | -0.13B |
| Q1 2025 | $5.0B | +0.03B |
| Q2 2025 | $5.5B | +0.50B |
| Q3 2025 | $5.5B | -0.01B |
| Q4 2025 | $5.1B | -0.37B |
| Q1 2026 | $4.1B | -0.97B |
Methodology & FAQ
How We Track AltaRock Partners Holdings
Our data is systematically aggregated directly from quarterly Form 13F-HR disclosures submitted to the U.S. Securities and Exchange Commission (SEC).
- Who Must File (Reporting Threshold): This dataset includes filings from U.S. institutional investment managers, hedge funds, mutual funds, university endowments, and family offices managing at least $100 million in Section 13(f) securities (including equities, options, convertibles, ETFs, and warrants).
- What is Included (Data Scope): By regulation, 13F filings include long positions in U.S. exchange-listed stocks, ETFs, shares of closed-end investment companies, and convertible debt, as defined in the SEC's official Section 13(f) securities list . For listed options (calls/puts) the reported value is based on the notional value.
- Portfolio Weight Explained (Metric Definition): “Portfolio Weight” shows how much of a fund's total reported 13F portfolio value (excluding listed options) is allocated to a specific position on the reporting date.
- How to Use This Data (Interpretation): Quarter-over-quarter changes in shares and portfolio weight reflect a combination of active trading and market price movements. These are descriptive metrics of fund allocation, not explicit buy or sell signals.
What does AltaRock Partners's 13F filing disclose about their portfolio?
A Form 13F-HR filed by AltaRock Partners with the U.S. SEC discloses all long positions in Section 13(f) securities — U.S.-listed equities, ETFs, closed-end funds, and listed put/call options — held at quarter-end with a market value of at least $200,000 or 10,000 or more shares. Pactolio aggregates these filings to surface AltaRock Partners’s reported portfolio weights, share counts, and quarter-over-quarter allocation shifts in a structured format. The filing represents a point-in-time snapshot of disclosed long-side exposure, not a real-time or complete view of the fund’s total book.
How do you measure conviction in AltaRock Partners's portfolio allocations?
Conviction is measured by portfolio weight — the percentage of AltaRock Partners’s total reported 13F market value allocated to a given position — rather than by absolute share count or dollar value alone. A position representing a disproportionately large share of the fund’s disclosed book signals high-conviction allocation, regardless of whether it ranks among the fund’s largest absolute holdings. Tracking how that weight changes quarter-over-quarter separates active reallocation decisions from passive price appreciation drift.
What is excluded from AltaRock Partners's 13F — short positions, swaps, and derivatives?
SEC Form 13F requires disclosure of long positions only. Specifically excluded are: short interest, total return swaps, credit default swaps, and all OTC derivatives — none of which appear in 13F filings regardless of position size. Listed put and call options must be disclosed but are excluded from portfolio weight calculations on this platform so that reported weights reflect direct equity exposure and remain comparable across filers. This means AltaRock Partners’s 13F represents the reported long book, which may differ materially from its net economic exposure.
When is AltaRock Partners's 13F data available, and how large is the reporting lag?
Investment managers must submit Form 13F within 45 calendar days of each quarter-end (the T+45 deadline). Pactolio ingests filings directly from SEC EDGAR as they are published — managers who file early appear in our system before the deadline, while late filers are captured on their actual filing date. The quarter label shown at the top of this page reflects the most recently processed 13F cycle for AltaRock Partners. The inherent reporting lag means the data always reflects positions as of the prior quarter-end, not current holdings.
Who must file a Form 13F with the SEC, and does AltaRock Partners qualify?
Under SEC Rule 13f-1, any investment manager — including hedge funds, family offices, registered investment advisers, pension funds, and university endowments — that exercises investment discretion over $100 million or more in Section 13(f) securities at any point during a calendar year must file Form 13F for that year. AltaRock Partners meets this threshold, which is why its holdings are publicly disclosed and accessible on this platform. The $100 million threshold is evaluated on a rolling basis, meaning new filers can enter and existing filers can exit the disclosure regime as AUM crosses that boundary.