Mark Massey - AltaRock Partners 13F Activity & Position Changes (Q3 2016)

According to the SEC 13F filed on Aug 17, 2026, the AltaRock Partners portfolio showed several notable changes in holdings as of quarter-end Sep 30, 2016. 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 Q3 2016, the filing reported:

New Buys - Westinghouse Air Brake Technolo

Increases - None reported

Reductions - Moody's Corporation

Complete Exits - Berkshire Hathaway Inc. New, Interactive Brokers Group, Inc.

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
Q3 2016	BRK-B Berkshire Hathaway Inc. New	Berkshire Hathaway Inc. New	Sell - Position Exit	-315,375	-100.0%	$0.00	-
Q3 2016	IBKR Interactive Brokers Group, Inc.	Interactive Brokers Group, Inc.	Sell - Position Exit	-7,201	-100.0%	$0.00	-
Q3 2016	MCO Moody's Corporation	Moody's Corporation	Sell	-27,019	-2.7%	$104.49K	965,000
Q3 2016	WAB Westinghouse Air Brake Technolo	Westinghouse Air Brake Technolo	Buy - Position Entry	+839,826	-	$68.57K	839,826