ACK Asset Management’s ATS Corp ATS Stock Holding History

ACK Asset 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 Q2	$43.2M	Sell	1,500,000 -346,196	-19%	-$10.7M	5.04%	8
2026 Q1	$52.1M	Hold	1,846,196	–	–	6.5%	3
2025 Q4	$50.8M	Hold	1,846,196	–	–	6.38%	4
2025 Q3	$48.4M	Hold	1,846,196	–	–	6.05%	8
2025 Q2	$58.9M	Sell	1,846,196 -167,000	-8%	-$4.57M	7.73%	2
2025 Q1	$50.2M	Sell	2,013,196 -80,000	-4%	-$2.23M	8.24%	4
2024 Q4	$63.8M	Sell	2,093,196 -162,693	-7%	-$4.94M	8.55%	3
2024 Q3	$65.5M	Buy	2,255,889 +255,889	+13%	+$7.4M	8.1%	5
2024 Q2	$64.6M	Buy	2,000,000 +460,000	+30%	+$14.8M	7.98%	6
2024 Q1	$51.9M	Buy	1,540,000 +235,020	+18%	+$9.33M	6.05%	8
2023 Q4	$56.2M	Buy	1,304,980 +83,639	+7%	+$3.25M	6.76%	6
2023 Q3	$52.1M	Hold	1,221,341	–	–	7.56%	3
2023 Q2	$56.3M	Buy	+1,221,341	New	+$54.9M	7.01%	4

Other funds holding ATS

MCM

Mason Capital Management New York $607M AUM 1.77% 1-Year Est. Return

Royal Bank of Canada Toronto, Ontario, Canada $672B AUM 33.48% 1-Year Est. Return

EIG

EdgePoint Investment Group Toronto, Ontario, Canada $13.2B AUM 32.43% 1-Year Est. Return

BGC

Beutel, Goodman & Co Toronto, Ontario, Canada $13.6B AUM 17.82% 1-Year Est. Return

TCAM

Turtle Creek Asset Management Toronto, Ontario, Canada $2.56B AUM 1.05% 1-Year Est. Return

Bank of Montreal Toronto, Ontario, Canada $304B AUM 35.64% 1-Year Est. Return

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

FFH

Fairfax Financial Holdings Toronto, Ontario, Canada $2.64B AUM 24.46% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

Jupiter Topco New York $245B AUM

ACK Asset Management's ATS Position: Q2 2026 in Review

ACK Asset Management reduced its ATS Corp (ATS) stake by 19% in Q2 2026, selling an estimated $10.7M and leaving 1,500,000 shares worth $43.2M. The position accounts for 5.04% of the portfolio, ranked #8.

ACK Asset Management first reported a position in ATS in Q2 2023 and has held it in 13 quarters since. The position peaked at $65.5M in Q3 2024. 141 funds tracked by Wall St. Rank hold ATS as of Q2 2026.

ACK Asset Management held 1,500,000 shares of ATS Corp worth $43.2M as of Q2 2026.
ACK Asset Management sold 346,196 ATS Corp shares in Q2 2026, an estimated $10.7M.
ATS Corp made up 5.04% of ACK Asset Management's portfolio in Q2 2026, its #8 holding.
ACK Asset Management first reported a position in ATS Corp in Q2 2023 and has held it in 13 quarters since.
ACK Asset Management's ATS Corp position peaked at $65.5M in Q3 2024.
141 funds tracked by Wall St. Rank held ATS Corp as of Q2 2026.

Based on ACK Asset Management's 13F filing for Q2 2026, filed 13 Aug 2026.