John Osterweis - AltaRock Partners LP

John Osterweis - AltaRock Partners

Period:    Q1 2026
Portfolio date:    31 Mar 2026
No. of stocks:    8
Portfolio value:    $4,126,337,614

Holdings Activity Buys Sells History

History	Stock	Activity ▼	Share change	% change to portfolio
	Q1 2026
☰	MCO - Moody's Corp.	Add 5.84%	47,533	0.50
☰	AMZN - Amazon.com Inc.	Add 3.46%	253,412	1.28
	Q3 2025
☰	AMZN - Amazon.com Inc.	Add 20.43%	1,282,347	5.15
	Q2 2025
☰	HLT - Hilton Worldwide Holdings	Add 98.79%	270,639	1.32
☰	AMZN - Amazon.com Inc.	Add 20.63%	1,073,491	4.30
☰	MCO - Moody's Corp.	Add 0.14%	1,349	0.01
	Q1 2025
☰	HLT - Hilton Worldwide Holdings	Add 199.97%	182,629	0.83
☰	MSFT - Microsoft Corp.	Add 36.32%	687,008	5.18
	Q4 2024
☰	GOOGL - Alphabet Inc.	Add 4.41%	146,896	0.56
☰	HLT - Hilton Worldwide Holdings	Buy	91,328	0.46
	Q3 2024
☰	MA - Mastercard Inc.	Add 132.19%	353,000	3.43
☰	AMZN - Amazon.com Inc.	Add 30.82%	1,272,860	4.67
	Q2 2024
☰	MCO - Moody's Corp.	Add 35.86%	286,945	2.49
☰	MSFT - Microsoft Corp.	Add 10.30%	180,630	1.66
☰	FICO - Fair Isaac Corp.	Buy	34,652	1.06
	Q4 2023
☰	MCO - Moody's Corp.	Add 135.35%	466,201	4.06
☰	CHTR - Charter Communications	Add 15.28%	76,058	0.66
	Q3 2023
☰	MCO - Moody's Corp.	Add 31.70%	82,900	0.66
☰	CHTR - Charter Communications	Add 24.59%	98,237	1.08
☰	V - Visa Inc.	Add 4.88%	96,744	0.56
	Q2 2023
☰	V - Visa Inc.	Add 20.21%	333,152	1.90
	Q1 2023
☰	CHTR - Charter Communications	Add 19.43%	65,000	0.64
☰	AMZN - Amazon.com Inc.	Add 3.91%	220,581	0.62
	Q4 2022
☰	AMZN - Amazon.com Inc.	Add 71.35%	2,350,336	6.20
☰	MCO - Moody's Corp.	Add 3.53%	8,926	0.08
	Q3 2022
☰	GOOGL - Alphabet Inc.	Add 1,971.27%	6,665,470	20.87
☰	MCO - Moody's Corp.	Add 104.86%	129,298	1.03
☰	MA - Mastercard Inc.	Add 32.08%	79,714	0.74
☰	V - Visa Inc.	Add 10.57%	165,703	0.96
☰	AMZN - Amazon.com Inc.	Add 7.49%	229,614	0.85
☰	MSFT - Microsoft Corp.	Add 3.17%	86,500	0.66
☰	TDG - TransDigm Group Inc.	Add 3.00%	43,700	0.75
	Q2 2022
☰	AMZN - Amazon.com Inc.	Add 20.41%	519,500	1.70
☰	V - Visa Inc.	Add 4.83%	72,300	0.44
☰	MSFT - Microsoft Corp.	Add 3.67%	96,700	0.77
☰	TDG - TransDigm Group Inc.	Add 2.63%	37,400	0.62
☰	GOOGL - Alphabet Inc.	Add 0.90%	3,020	0.20
	Q1 2022
☰	MSFT - Microsoft Corp.	Add 53.20%	915,133	7.20
☰	GOOGL - Alphabet Inc.	Add 16.21%	46,734	3.31
☰	TDG - TransDigm Group Inc.	Add 5.20%	70,225	1.17
☰	AMZN - Amazon.com Inc.	Buy	2,544,920	10.58
	Q4 2021
☰	V - Visa Inc.	Add 17,472.26%	1,487,588	8.50
☰	MA - Mastercard Inc.	Add 42.55%	75,000	0.71
☰	CHTR - Charter Communications	Add 13.43%	159,814	2.75
☰	TDG - TransDigm Group Inc.	Add 1.88%	24,872	0.42
☰	GOOGL - Alphabet Inc.	Add 0.87%	2,500	0.19
	Q3 2021
☰	MSFT - Microsoft Corp.	Add 108.93%	896,843	6.82
☰	TDG - TransDigm Group Inc.	Add 5.57%	70,000	1.18
	Q2 2021
☰	TDG - TransDigm Group Inc.	Add 31.87%	303,619	5.44
☰	CHTR - Charter Communications	Add 16.70%	172,374	3.44
☰	META - Meta Platforms Inc.	Add 2.64%	57,500	0.55
☰	MSFT - Microsoft Corp.	Buy	823,333	6.17
	Q1 2021
☰	META - Meta Platforms Inc.	Add 27.21%	465,800	5.21
☰	CHTR - Charter Communications	Add 15.36%	137,451	3.22
	Q4 2020
☰	META - Meta Platforms Inc.	Buy	1,711,882	19.60
	Q3 2020
☰	TDG - TransDigm Group Inc.	Add 2.74%	32,629	0.73
☰	GOOGL - Alphabet Inc.	Add 0.18%	642	0.04
	Q2 2020
☰	GOOGL - Alphabet Inc.	Add 23.82%	69,300	5.04
☰	TDG - TransDigm Group Inc.	Add 18.04%	182,265	4.13
☰	MA - Mastercard Inc.	Add 13.81%	50,000	0.76
☰	CHTR - Charter Communications	Add 5.07%	55,552	1.45
	Q1 2020
☰	TDG - TransDigm Group Inc.	Add 72.68%	425,143	8.65
☰	MCO - Moody's Corp.	Add 41.46%	435,463	5.85
☰	GOOGL - Alphabet Inc.	Add 26.50%	60,943	4.50
☰	CHTR - Charter Communications	Add 1.29%	14,000	0.39
	Q4 2019
☰	GOOGL - Alphabet Inc.	Buy	230,000	19.06
	Q3 2019
☰	CHTR - Charter Communications	Add 13.35%	127,388	4.55
	Q2 2019
☰	CHTR - Charter Communications	Add 10.97%	94,316	3.22
	Q4 2018
☰	TDG - TransDigm Group Inc.	Add 20.22%	108,054	4.37
☰	MCO - Moody's Corp.	Add 16.89%	163,354	2.72
☰	CHTR - Charter Communications	Add 12.16%	93,252	3.16
	Q3 2018
☰	BKNG - Booking Holdings Inc.	Add 16.04%	415,000	3.02
☰	CHTR - Charter Communications	Add 11.68%	80,200	2.40
	Q2 2018
☰	CHTR - Charter Communications	Add 16.43%	96,884	2.94
☰	BKNG - Booking Holdings Inc.	Add 1.27%	32,500	0.27
☰	ORLY - O'Reilly Automotive	Buy	333,079	9.42
	Q1 2018
☰	CHTR - Charter Communications	Add 34.56%	151,411	5.39
☰	BKNG - Booking Holdings Inc.	Buy	2,554,575	24.33
	Q4 2017
☰	CHTR - Charter Communications	Add 88.37%	205,530	9.07
☰	PCLN - Priceline Group Inc	Add 18.70%	14,850	3.39
	Q3 2017
☰	TDG - TransDigm Group Inc.	Add 13.00%	74,367	2.78
	Q2 2017
☰	TDG - TransDigm Group Inc.	Add 6.73%	36,094	1.37
☰	CHTR - Charter Communications	Add 6.48%	25,000	1.19
	Q1 2017
☰	PCLN - Priceline Group Inc	Add 19.94%	13,200	3.48
☰	MCO - Moody's Corp.	Add 0.38%	4,100	0.07
	Q4 2016
☰	TDG - TransDigm Group Inc.	Add 34.69%	152,356	5.56
☰	MCO - Moody's Corp.	Add 11.74%	113,336	1.57
☰	PCLN - Priceline Group Inc	Buy	66,213	14.22
	Q3 2016
☰	WAB - WABTEC Corp.	Buy	839,826	10.92
	Q2 2016
☰	1LGE - Liberty Lilac Group - C	Add 765.99%	352,700	2.08
☰	LBTYK - Liberty Global Ltd CL C	Add 25.20%	710,000	3.70
☰	BRK.B - Berkshire Hathaway CL B	Buy	315,375	8.30
	Q1 2016
☰	MCO - Moody's Corp.	Add 23.44%	197,429	3.51
☰	LBTYK - Liberty Global Ltd CL C	Add 17.88%	427,300	2.96
☰	CHTR - Charter Communications	Add 14.36%	70,000	2.61
☰	V - Visa Inc.	Add 12.82%	32,100	0.45
☰	TDG - TransDigm Group Inc.	Add 5.03%	34,972	1.42
	Q4 2015
☰	LBTYK - Liberty Global Ltd CL C	Add 37.82%	655,869	5.44
☰	MCO - Moody's Corp.	Add 14.68%	107,860	2.20
☰	TDG - TransDigm Group Inc.	Add 12.16%	75,380	3.50
	Q3 2015
☰	LBTYK - Liberty Global Ltd CL C	Add 63.92%	676,170	6.61
☰	MCO - Moody's Corp.	Add 57.31%	267,595	6.26
☰	CHTR - Charter Communications	Add 56.11%	180,146	7.55
☰	TDG - TransDigm Group Inc.	Add 42.95%	186,242	9.43
☰	MA - Mastercard Inc.	Add 2.10%	8,300	0.18
☰	1LGE - Liberty Lilac Group - C	Buy	46,045	0.38
	Q2 2015
☰	CHTR - Charter Communications	Add 312.44%	243,235	13.29
☰	TDG - TransDigm Group Inc.	Add 87.11%	201,871	14.46
☰	LBTYK - Liberty Global Ltd CL C	Add 31.67%	254,400	4.11
☰	MA - Mastercard Inc.	Add 26.85%	83,700	2.50
☰	MCO - Moody's Corp.	Add 8.03%	34,699	1.19
☰	IBKR - Interactive Brokers Group Inc.	Buy	33,101	0.44
	Q1 2015
☰	V - Visa Inc.	Add 428.09%	279,732	9.14
☰	MCO - Moody's Corp.	Add 98.80%	214,800	11.14
☰	LBTYK - Liberty Global Ltd CL C	Add 69.24%	328,687	8.18
☰	TDG - TransDigm Group Inc.	Add 49.44%	76,666	8.38
☰	MA - Mastercard Inc.	Add 20.02%	52,000	2.25
☰	CHTR - Charter Communications	Buy	77,850	7.51