Mark Massey - AltaRock Partners 13F Activity & Position Changes (Q4 2018)

According to the SEC 13F filed on Aug 17, 2026, the AltaRock Partners portfolio showed several notable changes in holdings as of quarter-end Dec 31, 2018. The activity included new positions, additions to existing holdings, reductions, and complete exits, providing a clear view of how the portfolio evolved during the quarter.

During Q4 2018, the filing reported:

New Buys - None reported

Increases - Charter Communications, Inc., Moody's Corporation, Transdigm Group Incorporated

Reductions - Mastercard Incorporated, O'Reilly Automotive, Inc.

Complete Exits - Booking Holdings Inc. Common St

These updates highlight how the portfolio adjusted across different sectors and market conditions, offering insights into allocation shifts and investment trends.

Date	Symbol	Name	Type	Change Qty	% Change	Value	Remaining
Q4 2018	BKNG Booking Holdings Inc. Common St	Booking Holdings Inc. Common St	Sell - Position Exit	-120,083	-100.0%	$0.00	-
Q4 2018	CHTR Charter Communications, Inc.	Charter Communications, Inc.	Buy	+93,252	+12.2%	$245.03K	859,850
Q4 2018	MA Mastercard Incorporated	Mastercard Incorporated	Sell	-1,350	-0.3%	$74.88K	396,940
Q4 2018	MCO Moody's Corporation	Moody's Corporation	Buy	+163,354	+16.9%	$158.28K	1,130,261
Q4 2018	ORLY O'Reilly Automotive, Inc.	O'Reilly Automotive, Inc.	Sell	-4,900	-1.6%	$106.31K	308,729
Q4 2018	TDG Transdigm Group Incorporated	Transdigm Group Incorporated	Buy	+108,054	+20.2%	$218.48K	642,485