MASON CAPITAL MANAGEMENT LLC

Holdings History for ATS Corp /ATS - Common Shares (ATS)

Symbol: ATS on NYSE
Investment type: Equity / Common Shares

Shares, Excluding Options vs Price

Value, Excluding Options

Holdings date	Weight	Change	Value $	Shares	Change	Activity %	Price	All Holders
31 Dec 2025	76%	0%	$428,620,663	15,563,568	0		$27.54	Q4 2025
30 Sep 2025	83%	0%	$407,765,482	15,563,568	0		$26.20	Q3 2025
30 Jun 2025	97%	0%	$496,166,548	15,563,568	0		$31.88	Q2 2025
31 Mar 2025	91%	+3.8%	$387,999,750	15,563,568	+648,803		$24.93	Q1 2025
31 Dec 2024	97%	0%	$454,602,037	14,914,765	0		$30.48	Q4 2024
30 Sep 2024	86%	+3.3%	$433,273,923	14,914,765	+565,000	+3.9%	$29.05	Q3 2024
30 Jun 2024	86%	0%	$463,640,907	14,349,765	0		$32.31	Q2 2024
31 Mar 2024		0%	$654,062,289	14,349,765	0		$45.58 ^*	Q1 2024
31 Dec 2023	86%	0%	$768,789,379	17,849,765	0		$43.07	Q4 2023
30 Sep 2023	65%	0%	$760,756,984	17,849,765	0		$42.62	Q3 2023
30 Jun 2023	81%	+81%	$822,695,669	17,849,765	+17,849,765	NEW	$46.09	Q2 2023

* Reported Price is the price of the security as of the portfolio date. This value is significant in that it is the last known price at which the security was still held.
An asterisk sign (*) next to the price indicates that the price is likely invalid.