Mason Capital Management’s ATS Corp ATS Stock Holding History

Mason Capital Management’s Portfolio ATS Stock Details ATS Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q1	$463M	Buy	16,404,170 +840,602	+5%	+$25.3M	75.48%	1
2025 Q4	$429M	Hold	15,563,568	–	–	76.32%	1
2025 Q3	$408M	Hold	15,563,568	–	–	82.99%	1
2025 Q2	$496M	Hold	15,563,568	–	–	97%	1
2025 Q1	$388M	Buy	15,563,568 +648,803	+4%	+$18.1M	90.83%	1
2024 Q4	$455M	Hold	14,914,765	–	–	96.62%	1
2024 Q3	$433M	Buy	14,914,765 +565,000	+4%	+$16.3M	86.21%	1
2024 Q2	$464M	Hold	14,349,765	–	–	86.14%	1
2024 Q1	$654M	Sell	14,349,765 -3,500,000	-20%	-$139M	89.87%	1
2023 Q4	$769M	Hold	17,849,765	–	–	86.01%	1
2023 Q3	$761M	Hold	17,849,765	–	–	65.44%	1
2023 Q2	$823M	Buy	+17,849,765	New	+$802M	80.16%	1

Other funds holding ATS

Royal Bank of Canada

Royal Bank of Canada Toronto, Ontario, Canada $528B AUM 27.57% 1-Year Est. Return

EdgePoint Investment Group Toronto, Ontario, Canada $12.5B AUM 31.7% 1-Year Est. Return

Beutel, Goodman & Co Toronto, Ontario, Canada $14.8B AUM 15.12% 1-Year Est. Return

Turtle Creek Asset Management Toronto, Ontario, Canada $2.67B AUM 0.64% 1-Year Est. Return

Bank of Montreal

Bank of Montreal Toronto, Ontario, Canada $245B AUM 31.4% 1-Year Est. Return

Fairfax Financial Holdings Toronto, Ontario, Canada $1.94B AUM 27.76% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

Janus Henderson Group

Janus Henderson Group London, United Kingdom $209B AUM 37.72% 1-Year Est. Return

Fidelity Investments

Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

Connor, Clark & Lunn Investment Management (CC&L)

Connor, Clark & Lunn Investment Management (CC&L) Vancouver, British Columbia, Canada $43.4B AUM 51.29% 1-Year Est. Return