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ALTAROCK PARTNERS LP

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13F filer, CIK 1631014, WEST PALM BEACH, FL

ALTAROCK PARTNERS LP reported $4,126,337,614 across 8 holdings for the quarter ended 2026-03-31, in a 13F-HR filed 2026-05-15.

Filed (acceptance time not in the bulk data set), ingested 13F-HR 0001104659-26-062170

Period
2026-03-31
Reported value
$4.13B
Holdings
8
Top 10 weight
100%
New
0
Sold out
0

Largest buys vs the previous quarter

SecurityShares changeApprox. value
AMZNadded+253,412$52.8M
MCOadded+47,533$20.7M

Ranked by the share change valued at this quarter's implied price (value over shares in the 13F). A position sold out is valued at the previous quarter's price, its last report.

Largest sells vs the previous quarter

SecurityShares changeApprox. value
HLTreduced-527,272-$160M
MSFTreduced-214,820-$79.5M
TDGreduced-60,232-$69.8M
GOOGLreduced-126,000-$36.2M
MAreduced-19,000-$9.49M

Ranked by the share change valued at this quarter's implied price (value over shares in the 13F). A position sold out is valued at the previous quarter's price, its last report.

Holdings, Q1 2026

Share positions as resolved from 13F-HR 0001104659-26-062170, largest first. % of portfolio is the value over $4,126,337,614, the sum of the share positions whose value is usable for ratios (method).

SecurityHistorySharesValue% of portfolioChangeLatest eventTimeline
AMZNAMAZON COM INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 5,402,320 shares; 2024Q4: 5,278,320 shares; 2025Q1: 5,202,415 shares; 2025Q2: 6,275,906 shares; 2025Q3: 7,558,253 shares; 2025Q4: 7,314,534 shares; 2026Q1: 7,567,946 shares 7,567,946$1.58B38.2%+253,412Timeline
TDGTRANSDIGM GROUP INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 1,048,264 shares; 2024Q4: 1,000,604 shares; 2025Q1: 979,950 shares; 2025Q2: 979,950 shares; 2025Q3: 976,392 shares; 2025Q4: 969,400 shares; 2026Q1: 909,168 shares 909,168$1.05B25.54%-60,232Timeline
MSFTMICROSOFT CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 1,934,816 shares; 2024Q4: 1,891,641 shares; 2025Q1: 2,578,649 shares; 2025Q2: 2,578,649 shares; 2025Q3: 2,569,267 shares; 2025Q4: 2,082,357 shares; 2026Q1: 1,867,537 shares 1,867,537$691M16.75%-214,820Timeline
MCOMOODYS CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 1,066,619 shares; 2024Q4: 950,905 shares; 2025Q1: 950,905 shares; 2025Q2: 952,254 shares; 2025Q3: 948,735 shares; 2025Q4: 814,503 shares; 2026Q1: 862,036 shares 862,036$376M9.11%+47,533Timeline
MAMASTERCARD INCORPORATEDQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 620,033 shares; 2024Q4: 586,254 shares; 2025Q1: 586,254 shares; 2025Q2: 586,254 shares; 2025Q3: 584,086 shares; 2025Q4: 541,836 shares; 2026Q1: 522,836 shares 522,836$261M6.33%-19,000Timeline
VVISA INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 1,118,383 shares; 2024Q4: 874,912 shares; 2025Q1: 850,412 shares; 2025Q2: 535,412 shares; 2025Q3: 533,522 shares; 2025Q4: 516,677 shares; 2026Q1: 498,677 shares 498,677$151M3.65%-18,000Timeline
GOOGLALPHABET INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 3,333,905 shares; 2024Q4: 3,480,801 shares; 2025Q1: 3,454,367 shares; 2025Q2: 1,045,429 shares; 2025Q3: 344,391 shares; 2025Q4: 169,391 shares; 2026Q1: 43,391 shares 43,391$12.5M0.3%-126,000Timeline
HLTHILTON WORLDWIDE HLDGS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: 91,328 shares; 2025Q1: 273,957 shares; 2025Q2: 544,596 shares; 2025Q3: 542,613 shares; 2025Q4: 542,613 shares; 2026Q1: 15,341 shares 15,341$4.66M0.11%-527,272Timeline

How Q1 2026 was built

Available 13F filings of this filer for the quarter and their roles: the base report is the latest original or restatement, NEW HOLDINGS amendments filed after it are added (method).

FilingRoleAmendmentFiledAcceptedIngested
13F-HR 0001104659-26-062170 base2026-05-15acceptance time not in the bulk data set