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AltaRock Partners

Q3 2025 13F · by Mark Massey, founder

As of
Sep 30, 2025
Filed
Nov 13, 2025
US stock
$5.5B · prev $5.5B
Positions
9 · prev 9
Options notional
$0
Documents
1· no amendments

Picture100.0% US stock

Full picture · of what this 13F reports is US stock

  • US stock listed on a US exchange 100.0%
  • Foreign stock not listed in the US 0.0%
  • Notes debt, at principal 0.0%
  • Puts at notional value 0.0%
  • Calls at notional value 0.0%

Moves9 since the prior filing

The book

Very concentrated · behaves like 5 equal-sized positions

  1. Very concentrated
  2. Concentrated
  3. Focused
  4. Diversified

Low turnover · 13% a year, about 7.4 years per position

  1. Low
  2. Moderate
  3. High

Top 5 positions93% of US stock

  1. AMZN Amazon.Com Inc added+5.20 pp added+5.2030.3%
  2. MSFT Microsoft Corp trimmed+0.91 pp trimmed+0.9124.3%
  3. TDG TransDigm Group Incorporated trimmed−3.68 pp trimmed−3.6823.5%
  4. MCO Moody's Corporation trimmed−0.45 pp trimmed−0.458.3%
  5. MA Mastercard Incorporated trimmed+0.06 pp trimmed+0.066.1%

Positions9 in this filing · 0 exited

AMZNAmazon.Com Inc30.34%7,558,253$1.7Badded+20%+5.20 pp15 q
MSFTMicrosoft Corp24.33%2,569,267$1.3Btrimmed−0%+0.91 pp18 q
TDGTransDigm Group Incorporated23.53%976,392$1.3Btrimmed−0%−3.68 pp44 q
MCOMoody's Corporation8.27%948,735$452Mtrimmed−0%−0.45 pp44 q
MAMastercard Incorporated6.07%584,086$332Mtrimmed−0%+0.06 pp44 q
VVISA Inc.3.33%533,522$182Mtrimmed−0%−0.14 pp44 q
HLTHilton Worldwide Holdings Inc.2.57%542,613$141Mtrimmed−0%−0.08 pp4 q
GOOGLAlphabet Inc. Class A1.53%344,391$84Mtrimmed−67%−1.83 pp24 q
FICOFair Isaac Corporation0.02%667$998,186trimmed−0%0.00 pp6 q

Source

Form
13F-HR
Reading
0 defects · 0 unresolved
Accession
0001104659-25-112002
Options
none in this filing
Notes
none in this filing
SEC cross-check
SEC data set not published yet