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Hedge fund

Altarock Partners LP

13F for the quarter to June 30, 2026, filed August 17, 2026 · SEC CIK 1631014

Reported value
$4.2bn
100% in companies we cover
Positions we cover
8
Largest AMZN 32.2%
Copy, a year
+18.8%
S&P 500 +13.4%
Copy Sharpe ratio
0.81
S&P 500 0.71

How copying its 13F would have done

$10.0k$20.0k$40.0k$80.0k 201520172019202120232025 $75.1k$43.5k
CopyS&P 500 $10,000 copying Altarock Partners LP's filed holdings in companies we cover from February 20, 2015, buying on the first trading day after each 13F was filed and holding until the next, against the S&P 500 (total return). Marked weekly, log scale. Before costs and taxes; misses trading within each quarter and anything 13F does not show (shorts, cash, bonds, non-US holdings).

Biggest drop −36.5% (S&P 500 −31.8%); beta 1.10; alpha +4.3% a year (t = 1.36); last 12 months +4.5% against +12.1%.

Reported value by quarter

Altarock Partners LP: 13F reported value Total value of all positions in each quarter's 13F, as filed (values before 2023 were filed in thousands of dollars and are converted).
$0 $1T $2T $3T $4T Reported value, 2014-12-31: $120.9M Reported value, 2015-03-31: $200.1M Reported value, 2015-06-30: $313.5M Reported value, 2015-09-30: $419.5M Reported value, 2015-12-31: $491.9M Reported value, 2016-03-31: $542.5M Reported value, 2016-06-30: $550.5M Reported value, 2016-09-30: $627.9M Reported value, 2016-12-31: $682.4M Reported value, 2017-03-31: $674.2M Reported value, 2017-06-30: $710.1M Reported value, 2017-09-30: $683.9M Reported value, 2017-12-31: $761.3M Reported value, 2018-03-31: $873.9M Reported value, 2018-06-30: $967.2M Reported value, 2018-09-30: $1.1B Reported value, 2018-12-31: $840.3M Reported value, 2019-03-31: $1.1B Reported value, 2019-06-30: $1.2B Reported value, 2019-09-30: $1.2B Reported value, 2019-12-31: $1.6B Reported value, 2020-03-31: $1.6B Reported value, 2020-06-30: $2B Reported value, 2020-09-30: $2.1B Reported value, 2020-12-31: $2.4B Reported value, 2021-03-31: $2.6B Reported value, 2021-06-30: $3.6B Reported value, 2021-09-30: $3.7B Reported value, 2021-12-31: $3.8B Reported value, 2022-03-31: $3.9B Reported value, 2022-06-30: $3.2B Reported value, 2022-09-30: $3.1B Reported value, 2022-12-31: $3.2T Reported value, 2023-03-31: $3.7B Reported value, 2023-06-30: $4.2B Reported value, 2023-09-30: $4B Reported value, 2023-12-31: $4.5B Reported value, 2024-03-31: $4.7B Reported value, 2024-06-30: $4.9B Reported value, 2024-09-30: $5.1B Reported value, 2024-12-31: $4.9B Reported value, 2025-03-31: $5B Reported value, 2025-06-30: $5.5B Reported value, 2025-09-30: $5.5B Reported value, 2025-12-31: $5.1B Reported value, 2026-03-31: $4.1B Reported value, 2026-06-30: $4.2B 2014-12-31 2017-06-30 2019-12-31 2022-06-30 2026-06-30 $4.2B
View chart data
Period Reported value
2014-12-31 $120.9M
2015-03-31 $200.1M
2015-06-30 $313.5M
2015-09-30 $419.5M
2015-12-31 $491.9M
2016-03-31 $542.5M
2016-06-30 $550.5M
2016-09-30 $627.9M
2016-12-31 $682.4M
2017-03-31 $674.2M
2017-06-30 $710.1M
2017-09-30 $683.9M
2017-12-31 $761.3M
2018-03-31 $873.9M
2018-06-30 $967.2M
2018-09-30 $1.1B
2018-12-31 $840.3M
2019-03-31 $1.1B
2019-06-30 $1.2B
2019-09-30 $1.2B
2019-12-31 $1.6B
2020-03-31 $1.6B
2020-06-30 $2B
2020-09-30 $2.1B
2020-12-31 $2.4B
2021-03-31 $2.6B
2021-06-30 $3.6B
2021-09-30 $3.7B
2021-12-31 $3.8B
2022-03-31 $3.9B
2022-06-30 $3.2B
2022-09-30 $3.1B
2022-12-31 $3.2T
2023-03-31 $3.7B
2023-06-30 $4.2B
2023-09-30 $4B
2023-12-31 $4.5B
2024-03-31 $4.7B
2024-06-30 $4.9B
2024-09-30 $5.1B
2024-12-31 $4.9B
2025-03-31 $5B
2025-06-30 $5.5B
2025-09-30 $5.5B
2025-12-31 $5.1B
2026-03-31 $4.1B
2026-06-30 $4.2B

Holdings and moves

CompanyShare of portfolioValueSharesChange in shares
AMZNAmazon32.21%$1.4bn5.73M−24.3% Reduced
TDGTransDigm Group27.51%$1.2bn875.8K−3.7% Reduced
MSFTMicrosoft Corporation20.54%$870.8m2.33M+25.0% Added
MAMastercard9.26%$392.7m764.5K+46.2% Added
VVisa Inc.6.77%$287.0m836.5K+67.7% Added
MCOMoody's Corporation3.23%$137.1m302.6K−64.9% Reduced
GOOGLAlphabet Inc. (Class A)0.35%$15.0m42.0K−3.2% Reduced
HLTHilton Worldwide0.12%$5.0m15.2K−0.9% Reduced
CompanyBought (value)Shares
MSFTMicrosoft Corporation$174.2m466.9K
MAMastercard$124.1m241.7K
VVisa Inc.$115.9m337.8K

Change in shares on the previous quarter's 13F, valued at this quarter's reported price.

CompanySold (value)Shares
AMZNAmazon−$438.1m−1.84M
MCOMoody's Corporation−$253.4m−559.4K
TDGTransDigm Group−$44.5m−33.4K
GOOGLAlphabet Inc. (Class A)−$499,246−1.4K
HLTHilton Worldwide−$45,934−139

Change in shares on the previous quarter's 13F, valued at this quarter's reported price.

No positions in covered companies were sold out this quarter.

  • Consumer Discretionary32.3%
  • Industrials27.5%
  • Technology20.5%
  • Financials19.3%
  • Communication Services0.4%

Share of the value held in companies we cover, by sector.

PeriodCopy, a yearS&P 500SharpeS&P 500Biggest dropBeta
Whole backtestFebruary 20, 2015 to November 2, 2026+18.8%+13.4%0.810.71−36.5%1.10
2018 onwardsJanuary 5, 2018 to November 2, 2026+18.8%+13.9%0.740.66−36.5%1.11
Last three yearsNovember 3, 2023 to November 2, 2026+18.7%+21.8%0.741.16−19.6%1.08
Last yearNovember 7, 2025 to November 2, 2026+5.9%+14.2%0.190.84−19.6%1.30

From SEC Form 13F data sets. A 13F lists long positions in US-listed shares at the quarter's end, filed up to 45 days later; it does not show shorts, cash, bonds, non-US holdings or trades within the quarter. Positions in companies outside our coverage are not listed here. Research, not investment advice.