In Q2 2026, AltaRock Partners held 8 US-listed stocks worth $4.2bn. Its biggest move was cutting Amazon.com (24% fewer shares, now 32%), followed by cutting Moody's (65% fewer shares, now 3.2%). Its largest holding is Amazon.com at 32%.
Q2 2026, filed 17 Aug 2026 (filing): 0 new, 3 added to, 5 trimmed, 0 sold out. Select a row to see it over time.How this works
Changes compare share counts with Q1 2026, adjusted for stock splits. Share classes of the same company are combined. Values are at quarter-end prices.
13F holdings with change from the previous quarter
Each bar is one 13F. Select a bar or press play to see that quarter’s 12 largest positions.How this works
Bars are split by share of the US portfolio: the six biggest holdings over the period in colour, everything else in grey. The last eight quarters are shown in full, earlier years at year end.
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TDGAMZNMSFTMCOCHTRGOOGEverything else
2014: Transdigm Group 25.2%, Amazon.com 0.0%, Microsoft 0.0%, Moody's 17.2%, Charter Communications 0.0%, Alphabet 0.0%; 2015: Transdigm Group 32.3%, Amazon.com 0.0%, Microsoft 0.0%, Moody's 17.2%, Charter Communications 18.1%, Alphabet 0.0%; 2016: Transdigm Group 21.6%, Amazon.com 0.0%, Microsoft 0.0%, Moody's 14.9%, Charter Communications 20.3%, Alphabet 0.0%; 2017: Transdigm Group 20.9%, Amazon.com 0.0%, Microsoft 0.0%, Moody's 18.8%, Charter Communications 19.3%, Alphabet 0.0%; 2018: Transdigm Group 26.0%, Amazon.com 0.0%, Microsoft 0.0%, Moody's 18.8%, Charter Communications 29.2%, Alphabet 0.0%; 2019: Transdigm Group 20.3%, Amazon.com 0.0%, Microsoft 0.0%, Moody's 15.4%, Charter Communications 32.5%, Alphabet 19.1%; 2020: Transdigm Group 26.6%, Amazon.com 0.0%, Microsoft 0.0%, Moody's 2.8%, Charter Communications 24.8%, Alphabet 23.5%; 2021: Transdigm Group 22.7%, Amazon.com 0.0%, Microsoft 15.3%, Moody's 1.3%, Charter Communications 23.2%, Alphabet 22.0%; 2022: Transdigm Group 27.9%, Amazon.com 14.9%, Microsoft 19.3%, Moody's 2.3%, Charter Communications 3.6%, Alphabet 17.8%; 2023: Transdigm Group 27.9%, Amazon.com 15.0%, Microsoft 16.7%, Moody's 7.1%, Charter Communications 5.0%, Alphabet 15.1%; Q3 ’24: Transdigm Group 29.5%, Amazon.com 19.8%, Microsoft 16.4%, Moody's 10.0%, Charter Communications 0.0%, Alphabet 10.9%; Q4 ’24: Transdigm Group 25.6%, Amazon.com 23.4%, Microsoft 16.1%, Moody's 9.1%, Charter Communications 0.0%, Alphabet 13.3%; Q1 ’25: Transdigm Group 27.3%, Amazon.com 19.9%, Microsoft 19.5%, Moody's 8.9%, Charter Communications 0.0%, Alphabet 10.7%; Q2 ’25: Transdigm Group 27.2%, Amazon.com 25.1%, Microsoft 23.4%, Moody's 8.7%, Charter Communications 0.0%, Alphabet 3.4%; Q3 ’25: Transdigm Group 23.5%, Amazon.com 30.3%, Microsoft 24.3%, Moody's 8.3%, Charter Communications 0.0%, Alphabet 1.5%; Q4 ’25: Transdigm Group 25.3%, Amazon.com 33.1%, Microsoft 19.8%, Moody's 8.2%, Charter Communications 0.0%, Alphabet 1.0%; Q1 ’26: Transdigm Group 25.5%, Amazon.com 38.2%, Microsoft 16.8%, Moody's 9.1%, Charter Communications 0.0%, Alphabet 0.3%; Q2 ’26: Transdigm Group 27.5%, Amazon.com 32.2%, Microsoft 20.5%, Moody's 3.2%, Charter Communications 0.0%, Alphabet 0.3%
Q1 Q2 Q3 Q4 · each quarter is that quarter’s profits times the stake reported at its end. *2026 so far: 2 quarters. Click a quarter to see its holdings.
Net income is as reported (GAAP), so it includes one-off items and, for some companies, gains or losses on investments they hold. Companies that report under IFRS (most non-US companies) or whose shares we can’t match reliably are left out; “portfolio covered” shows how much is included. Look-through earnings explained. Growth compares earnings per share over the last 12 months with the 12 months a year earlier, for holdings profitable in both.
US holdings by sector
Consumer discretionary32.3%
Industrials27.5%
Technology20.5%
Financials19.3%
Communication and media0.4%
Sectors are grouped from each company’s SEC industry code, as a share of the Q2 2026 13F.