DOSSIER · 13F-HR · Q2 2026

ALTAROCK PARTNERS LP

$4.2B in tracked AUM across 8 positions as of Q2 2026.

AP
CIK 0001631014 · last filed Jun 30, 2026
Total AUM
$4.2B
as of Q2 2026
Holdings
8
positions
Whale Score
79
79
strong
Activity
no data
changes this Q
AI Analysis · Q2 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.

Analysis generated by 13F Insight from SEC Form 13F filing data · Q2 2026. Methodology

Quarter at a glance — Q2 2026

Position-change comparison pending.

No quarter-over-quarter changes available.

Top 10 holdings

By portfolio weight as of Q2 2026.

#HoldingValueSharesWeight
01
AMZN
AMAZON.COM INC
$1.4B5.7M32.2%
02
TDG
TRANSDIGM GROUP INC
$1.2B876K27.5%
03
MSFT
MICROSOFT CORP
$871M2.3M20.5%
04
MA
MASTERCARD INC-CLASS A
$393M765K9.3%
05
V
VISA INC-CLASS A SHRS
$287M836K6.8%
06
MCO
MOODYS CORP
$137M303K3.2%
07
GOOGL
ALPHABET INC-CL A
$15M42K0.4%
08
HLT
HILTON WORLDWIDE
$5M15K0.1%

Filing history

2026Q2Jun 30
$4.2B 2.7%
8 positionsView →
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 positionsLocked
2025Q1Mar 31
$1.2B 75.4%
4 positionsLocked
2024Q4Dec 31
$4.9B 2.6%
10 positionsLocked
2024Q3Sep 30
$5.1B 4.5%
9 positionsLocked
2024Q2Jun 30
$4.9B 4.4%
9 positionsLocked
2024Q1Mar 31
$4.7B 3.8%
8 positionsLocked
2023Q4Dec 31
$4.5B 12.3%
8 positionsLocked
2023Q3Sep 30
$4.0B 4.1%
8 positionsLocked
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