ALTAROCK PARTNERS LP 13F: Quarter-over-Quarter Portfolio Changes
ALTAROCK PARTNERS LP reported a disclosed portfolio value of approximately $4.1 billion in its latest SEC Form 13F-HR filing for Q1 2026, down 19.1% quarter on quarter. Over the quarter, the manager bought more shares in 2 holdings and trimmed 6 holdings.
ALTAROCK PARTNERS LP's top buy was Moodys CORP (MCO) . The manager bought 5.8% more shares, lifting the position's portfolio weight by 1.0 percentage points. Its top sell was Hilton Worldwide Hldgs INC (HLT) . The manager sold 97.2% of its previously reported shares, reducing the position's portfolio weight by 2.9 percentage points.
Top BuysQ1 2026
The manager's top buys among existing positions in Q1 2026. Ranked by portfolio-weight impact, with the percentage of additional shares shown separately.
| Company | Ticker | Portfolio Weight Change | More Shares | History |
|---|---|---|---|---|
| MOODYS CORP | MCO | +1.0% | +5.8% | History → |
| AMAZON.COM | AMZN | +5.1% | +3.5% | History → |
Top SellsQ1 2026
The manager's top sells among positions it retained in Q1 2026. Ranked by portfolio-weight impact. Full exits are listed separately.
| Company | Ticker | Portfolio Weight Change | Shares Sold | History |
|---|---|---|---|---|
| HILTON WORLDWIDE HLDGS INC | HLT | -2.9% | 97.2% | History → |
| ALPHABET CL A | GOOGL | -0.7% | 74.4% | History → |
| MICROSOFT | MSFT | -3.0% | 10.3% | History → |
| TRANSDIGM GROUP INC | TDG | 0.3% | 6.2% | History → |
| MASTERCARD INCORPORATED | MA | 0.3% | 3.5% | History → |
| VISA | V | 0.1% | 3.5% | History → |
Net Portfolio Value ChangeQ1 2026
- $5.1BPrior quarter
- $4.1BCurrent quarter
- $-1.0BNet delta
- -19.1%% change
Methodology & FAQ
How ALTAROCK PARTNERS LP Quarterly Changes Are Computed
All deltas are sourced from sequential SEC Form 13F-HR filings for ALTAROCK PARTNERS LP: each row joins the most recent filing against the immediately preceding quarterly filing for the same fund. Share-count changes reflect reported trading activity, while portfolio weights can also move because of market price changes. Portfolio weights are normalized to exclude listed options for comparability. A complete description — including how confidential treatment filings are handled — is documented in the Methodology.
What stocks did ALTAROCK PARTNERS LP buy in Q1 2026?
In Q1 2026, ALTAROCK PARTNERS LP bought more shares of MOODYS CORP (MCO), AMAZON.COM (AMZN).
What stocks did ALTAROCK PARTNERS LP sell in Q1 2026?
In Q1 2026, ALTAROCK PARTNERS LP reduced holdings in HILTON WORLDWIDE HLDGS INC (HLT), ALPHABET CL A (GOOGL), MICROSOFT (MSFT), TRANSDIGM GROUP INC (TDG), MASTERCARD INCORPORATED (MA) — the largest 5 of 6 reductions.
Which positions did ALTAROCK PARTNERS LP initiate in Q1 2026?
ALTAROCK PARTNERS LP established no new positions in Q1 2026.
Which existing positions saw the largest allocation increases for ALTAROCK PARTNERS LP in Q1 2026?
Of 2 existing positions with share-count increases in Q1 2026, the largest were: MOODYS CORP (MCO, +1.0% weight, +5.8% shares), AMAZON.COM (AMZN, +5.1% weight, +3.5% shares).
Which positions did ALTAROCK PARTNERS LP fully exit in Q1 2026?
ALTAROCK PARTNERS LP fully exited no positions in Q1 2026.
Which existing positions saw the largest allocation reductions for ALTAROCK PARTNERS LP in Q1 2026?
Of 6 existing positions with share-count reductions in Q1 2026, the largest were: HILTON WORLDWIDE HLDGS INC (HLT, -2.9% weight, -97.2% shares), ALPHABET CL A (GOOGL, -0.7% weight, -74.4% shares), MICROSOFT (MSFT, -3.0% weight, -10.3% shares), TRANSDIGM GROUP INC (TDG, 0.3% weight, -6.2% shares), MASTERCARD INCORPORATED (MA, 0.3% weight, -3.5% shares), VISA (V, 0.1% weight, -3.5% shares).
Do quarter-over-quarter 13F allocation changes constitute explicit trading signals?
No. Quarter-over-quarter changes reflect a combination of active trading and market price movement. A weight increase can result from price appreciation alone, without the manager adding shares. Share-count delta is the cleaner indicator of explicit trading activity. All deltas on this page are sourced from sequential SEC Form 13F-HR filings.