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AltaRock Partners

by Mark Massey, founder since 2002 hedge fund

Legal name
AltaRock Partners LP
On record since?
Q4 2014
Filings read
47
Style
Quality
Website
altarockpartners.com
View more
CIK
0001631014
Read since
Aug 22, 2026

Q2 2026 · filed Aug 14, 2026 · $4.2B US stock · 8 positions · Very concentrated · Moderate turnover · Top: AMZN 32.2% · TDG 27.5% · MSFT 20.5%

Read the filing →

Streakslongest held · 47 quarters on record

  1. TDG TransDigm Group Incorporated 27.5%47+ quarters
  2. MA Mastercard Incorporated 9.3%47+ quarters
  3. V VISA Inc. 6.8%47+ quarters
  4. MCO Moody's Corporation 3.2%47+ quarters
  5. GOOGL Alphabet Inc. Class A 0.3%27 quarters

4 names have been in this book every quarter on record (47). Nothing in this book is new this quarter.

Over time47 quarters, Q4 2014 to Q2 2026

US stock$4.2B Q2 2026

Positions8 Q2 2026

Picture100.0% Q2 2026

Turnover39%/yr Q2 2026

Filings47

  1. Q2 2026 filed Aug 14, 26 $4.2B · 8 positions  · 0 new · 0 exited full · Very concentrated 0 new · 0 exited
  2. Q1 2026 filed May 14, 26 $4.1B · 8 positions  · 0 new · 0 exited full · Very concentrated 0 new · 0 exited
  3. Q4 2025 filed Feb 13, 26 $5.1B · 8 positions  · 0 new · 1 exited full · Very concentrated 0 new · 1 exited
  4. Q3 2025 filed Nov 13, 25 $5.5B · 9 positions  · 0 new · 0 exited full · Very concentrated 0 new · 0 exited
  5. Q2 2025 filed Aug 13, 25 $5.5B · 9 positions  · 0 new · 0 exited full · Very concentrated 0 new · 0 exited
  6. Q1 2025 filed May 14, 25 $5.0B · 9 positions  · 0 new · 1 exited full · Very concentrated 0 new · 1 exited
  7. Q4 2024 filed Feb 14, 25 $4.9B · 10 positions  · 1 new · 0 exited full · Very concentrated 1 new · 0 exited
  8. Q3 2024 filed Nov 13, 24 $5.1B · 9 positions  · 0 new · 0 exited full · Very concentrated 0 new · 0 exited
  9. Q2 2024 filed Aug 14, 24 $4.9B · 9 positions  · 1 new · 0 exited full · Very concentrated 1 new · 0 exited
  10. Q1 2024 filed May 16, 24 $4.7B · 8 positions  · 0 new · 0 exited full · Very concentrated 0 new · 0 exited
  11. Q4 2023 filed Feb 13, 24 $4.5B · 8 positions  · 0 new · 0 exited full · Very concentrated 0 new · 0 exited
  12. Q3 2023 filed Nov 13, 23 $4.0B · 8 positions  · 0 new · 0 exited full · Very concentrated 0 new · 0 exited
  13. Q2 2023 filed Aug 14, 23 $4.2B · 8 positions  · 0 new · 0 exited full · Very concentrated 0 new · 0 exited
  14. Q1 2023 filed May 15, 23 $3.7B · 8 positions  · 0 new · 0 exited full · Very concentrated 0 new · 0 exited
  15. Q4 2022 filed Feb 13, 23 $3.2B · 8 positions  · 0 new · 0 exited full · Very concentrated 0 new · 0 exited
  16. Q3 2022 filed Nov 11, 22 $3.1B · 8 positions  · 0 new · 0 exited full · Very concentrated 0 new · 0 exited
  17. Q2 2022 filed Aug 12, 22 $3.2B · 8 positions  · 0 new · 1 exited full · Very concentrated 0 new · 1 exited
  18. Q1 2022 filed May 13, 22 $3.9B · 9 positions  · 1 new · 0 exited full · Very concentrated 1 new · 0 exited
  19. Q4 2021 filed Feb 14, 22 $3.8B · 8 positions  · 0 new · 0 exited full · Very concentrated 0 new · 0 exited
  20. Q3 2021 filed Nov 15, 21 $3.7B · 8 positions  · 0 new · 0 exited full · Very concentrated 0 new · 0 exited
  21. Q2 2021 filed Aug 13, 21 $3.6B · 8 positions  · 1 new · 0 exited full · Very concentrated 1 new · 0 exited
  22. Q1 2021 filed May 14, 21 $2.6B · 7 positions  · 0 new · 0 exited full · Very concentrated 0 new · 0 exited
  23. Q4 2020 filed Feb 15, 21 $2.4B · 7 positions  · 1 new · 0 exited full · Very concentrated 1 new · 0 exited
  24. Q3 2020 filed Nov 13, 20 $2.1B · 6 positions  · 0 new · 0 exited full · Very concentrated 0 new · 0 exited
  25. Q2 2020 filed Aug 13, 20 $2.0B · 6 positions  · 0 new · 0 exited full · Very concentrated 0 new · 0 exited
  26. Q1 2020 filed May 13, 20 $1.6B · 6 positions  · 0 new · 1 exited full · Very concentrated 0 new · 1 exited
  27. Q4 2019 filed Feb 13, 20 $1.6B · 7 positions  · 1 new · 0 exited full · Very concentrated 1 new · 0 exited
  28. Q3 2019 filed Nov 13, 19 $1.2B · 6 positions  · 0 new · 0 exited full · Very concentrated 0 new · 0 exited
  29. Q2 2019 filed Aug 14, 19 $1.2B · 6 positions  · 0 new · 0 exited full · Very concentrated 0 new · 0 exited
  30. Q1 2019 filed May 14, 19 $1.1B · 6 positions  · 0 new · 0 exited full · Very concentrated 0 new · 0 exited
  31. Q4 2018 filed Feb 14, 19 $840M · 6 positions  · 0 new · 1 exited full · Very concentrated 0 new · 1 exited
  32. Q3 2018 filed Nov 13, 18 $1.1B · 7 positions  · 0 new · 0 exited full · Very concentrated 0 new · 0 exited
  33. Q2 2018 filed Aug 10, 18 $967M · 7 positions  · 1 new · 1 exited full · Very concentrated 1 new · 1 exited
  34. Q1 2018 filed May 14, 18 $874M · 7 positions  · 1 new · 1 exited full · Very concentrated 1 new · 1 exited
  35. Q4 2017 filed Feb 13, 18 $761M · 7 positions  · 0 new · 0 exited full · Very concentrated 0 new · 0 exited
  36. Q3 2017 filed Nov 13, 17 $684M · 7 positions  · 0 new · 0 exited full · Very concentrated 0 new · 0 exited
  37. Q2 2017 filed Aug 11, 17 $710M · 7 positions  · 0 new · 1 exited full · Very concentrated 0 new · 1 exited
  38. Q1 2017 filed May 15, 17 $674M · 8 positions  · 0 new · 0 exited full · Very concentrated 0 new · 0 exited
  39. Q4 2016 filed Feb 14, 17 $682M · 8 positions  · 1 new · 1 exited full · Very concentrated 1 new · 1 exited
  40. Q3 2016 filed Nov 14, 16 $628M · 8 positions  · 1 new · 2 exited full · Very concentrated 1 new · 2 exited
  41. Q2 2016 filed Aug 15, 16 $550M · 9 positions  · 2 new · 1 exited full · Very concentrated 2 new · 1 exited
  42. Q1 2016 filed May 11, 16 $543M · 8 positions  · 0 new · 0 exited full · Very concentrated 0 new · 0 exited
  43. Q4 2015 filed Feb 8, 16 $492M · 8 positions  · 0 new · 0 exited full · Very concentrated 0 new · 0 exited
  44. Q3 2015 filed Nov 12, 15 $420M · 8 positions  · 1 new · 0 exited full · Very concentrated 1 new · 0 exited
  45. Q2 2015 filed Aug 13, 15 $314M · 7 positions  · 1 new · 0 exited full · Very concentrated 1 new · 0 exited
  46. Q1 2015 filed May 13, 15 $200M · 6 positions  · 1 new · 1 exited full · Very concentrated 1 new · 1 exited
  47. Q4 2014 filed Feb 13, 15 $121M · 6 positions  · 0 new · 0 exited full · Very concentrated 0 new · 0 exited

People1

  • Mark Massey · founder · 2002–Founder and CIO, majority owner. Source: Form ADV 161005