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AltaRock Partners

Q2 2026 13F · by Mark Massey, founder

As of
Jun 30, 2026
Filed
Aug 14, 2026
US stock
$4.2B · prev $4.1B
Positions
8 · prev 8
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%

Moves8 since the prior filing

The book

Very concentrated · behaves like 4 equal-sized positions

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

Moderate turnover · 39% a year, about 2.6 years per position

  1. Low
  2. Moderate
  3. High

Top 5 positions96% of US stock

  1. AMZN Amazon.Com Inc trimmed−5.99 pp trimmed−5.9932.2%
  2. TDG TransDigm Group Incorporated trimmed+1.97 pp trimmed+1.9727.5%
  3. MSFT Microsoft Corp added+3.79 pp added+3.7920.5%
  4. MA Mastercard Incorporated added+2.93 pp added+2.939.3%
  5. V VISA Inc. added+3.12 pp added+3.126.8%

Positions8 in this filing · 0 exited

AMZNAmazon.Com Inc32.21%5,729,972$1.4Btrimmed−24%−5.99 pp18 q
TDGTransDigm Group Incorporated27.51%875,755$1.2Btrimmed−4%+1.97 pp47+ q
MSFTMicrosoft Corp20.54%2,334,482$871Madded+25%+3.79 pp21 q
MAMastercard Incorporated9.26%764,507$393Madded+46%+2.93 pp47+ q
VVISA Inc.6.77%836,470$287Madded+68%+3.12 pp47+ q
MCOMoody's Corporation3.23%302,624$137Mtrimmed−65%−5.88 pp47+ q
GOOGLAlphabet Inc. Class A0.35%41,994$15Mtrimmed−3%+0.05 pp27 q
HLTHilton Worldwide Holdings Inc.0.12%15,202$5Mtrimmed−1%+0.01 pp7 q

Source

Form
13F-HR
Reading
0 defects · 0 unresolved
Accession
0001104659-26-097527
Options
none in this filing
Notes
none in this filing
SEC cross-check
SEC data set not published yet