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AltaRock Partners

Q1 2026 13F · by Mark Massey, founder

As of
Mar 31, 2026
Filed
May 14, 2026
US stock
$4.1B · prev $5.1B
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

Low turnover · 7.1% a year, about 14.0 years per position

  1. Low
  2. Moderate
  3. High

Top 5 positions96% of US stock

  1. AMZN Amazon.Com Inc added+5.10 pp added+5.1038.2%
  2. TDG TransDigm Group Incorporated trimmed+0.26 pp trimmed+0.2625.5%
  3. MSFT Microsoft Corp trimmed−3.00 pp trimmed−3.0016.8%
  4. MCO Moody's Corporation added+0.95 pp added+0.959.1%
  5. MA Mastercard Incorporated trimmed+0.26 pp trimmed+0.266.3%

Positions8 in this filing · 0 exited

AMZNAmazon.Com Inc38.20%7,567,946$1.6Badded+3%+5.10 pp17 q
TDGTransDigm Group Incorporated25.54%909,168$1.1Btrimmed−6%+0.26 pp46 q
MSFTMicrosoft Corp16.75%1,867,537$691Mtrimmed−10%−3.00 pp20 q
MCOMoody's Corporation9.11%862,036$376Madded+6%+0.95 pp46 q
MAMastercard Incorporated6.33%522,836$261Mtrimmed−4%+0.26 pp46 q
VVISA Inc.3.65%498,677$151Mtrimmed−3%+0.10 pp46 q
GOOGLAlphabet Inc. Class A0.30%43,391$12Mtrimmed−74%−0.74 pp26 q
HLTHilton Worldwide Holdings Inc.0.11%15,341$5Mtrimmed−97%−2.95 pp6 q

Source

Form
13F-HR
Reading
0 defects · 0 unresolved
Accession
0001104659-26-062170
Options
none in this filing
Notes
none in this filing
SEC cross-check
SEC data set not published yet