13F Insight
DOSSIER · 13F-HR · Q1 2026

ALTAROCK PARTNERS LP

$4.1B in tracked AUM across 8 positions as of Q1 2026.

AP
CIK 0001631014 · last filed Mar 31, 2026
Total AUM
$4.1B
as of Q1 2026
Holdings
8
—
positions
Whale Score
77
77
strong
Activity
—
no data
changes this Q
AI Analysis · Q1 2026

Portfolio Overview

The SEC 13F filing for ALTAROCK PARTNERS LP as of September 30, 2025, reveals a period of significant portfolio contraction and reallocation. The total portfolio value plummeted by 86.5%, decreasing from $5.48 billion in the previous quarter (June 30, 2025) to $738.86 million. This drastic reduction suggests a substantial shift in strategy, likely involving large-scale capital distributions to investors, a move to cash, or a pivot in the firm’s investment mand...

Key Holdings

The portfolio is currently dominated by high-quality, large-cap "compounder" stocks, with the top four positions accounting for the entire portfolio value.

Quarter at a glance — Q1 2026

Position-change comparison pending.

No quarter-over-quarter changes available.

Top 10 holdings

By portfolio weight as of Q1 2026.

#HoldingValueSharesWeight
01
AMZN
AMAZON.COM INC
$1.6B7.6M38.2%02
TDG
TRANSDIGM GROUP INC
$1.1B909K25.5%03
MSFT
MICROSOFT CORP
$691M1.9M16.8%04
MCO
MOODYS CORP
$376M862K9.1%05
MA
MASTERCARD INC-CLASS A
$261M523K6.3%06
V
VISA INC-CLASS A SHRS
$151M499K3.7%07
GOOGL
ALPHABET INC-CL A
$12M43K0.3%08
HLT
HILTON WORLDWIDE
$5M15K0.1%

Filing history

2026Q1Mar 31
$4.1B▼ 19.1%
8 positionsView →2025Q4Dec 31
$5.1B▲ 590.3%
8 positionsView →2025Q3Sep 30
$739M▼ 86.5%
4 positionsView →2025Q2Jun 30
$5.5B▲ 350.5%
9 positionsLocked2025Q1Mar 31
$1.2B▼ 75.4%
4 positionsLocked2024Q4Dec 31
$4.9B▼ 2.6%
10 positionsLocked2024Q3Sep 30
$5.1B▲ 4.5%
9 positionsLocked2024Q2Jun 30
$4.9B▲ 4.4%
9 positionsLocked2024Q1Mar 31
$4.7B▲ 3.8%
8 positionsLocked2023Q4Dec 31
$4.5B▲ 12.3%
8 positionsLocked2023Q3Sep 30
$4.0B▼ 4.1%
8 positionsLocked2023Q2Jun 30
$4.2B▲ 14.1%
8 positionsLocked
Showing 12 of 43