Position in ATS
as of Mar 31, 2026
· filed May 15, 2026
Position Value
$462,597,594
+$33,976,932 QoQ
Shares Held
16,404,170
+5.4% QoQ
Ownership
16.9%
of shares outstanding
% of Portfolio
88.21%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Jun 2023
12 quarters on record
Voting authority
Sole 100%
Shared 0%
None 0%
Common Shares in ATS Over Time
Shares Held
Position Value (USD)
Position in Specialty Industrial Machinery
Industrials · as of Mar 31, 2026MASON CAPITAL MANAGEMENT LLC holds $462,597,594 across 1 Specialty Industrial Machinery name. ATS ranks #1 (100.0% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | ATS |
ATS Corp /ATS
This page
|
16,404,170 | $462,597,594 |
All Filings in ATS
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12 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $462,597,594 | 16,404,170 | Shares | Sole | 2026-05-15 | |
| 2025-12-31 | $428,620,662 | 15,563,568 | Shares | Sole | 2026-02-17 | |
| 2025-09-30 | $407,765,481 | 15,563,568 | Shares | Sole | 2025-11-14 | |
| 2025-06-30 | $496,166,547 | 15,563,568 | Shares | Sole | 2025-08-14 | |
| 2025-03-31 | $387,999,750 | 15,563,568 | Shares | Sole | 2025-05-15 | |
| 2024-12-31 | $454,602,037 | 14,914,765 | Shares | Sole | 2025-02-14 | |
| 2024-09-30 | $433,273,923 | 14,914,765 | Shares | Sole | 2024-11-14 | |
| 2024-06-30 | $463,640,907 | 14,349,765 | Shares | Sole | 2024-08-14 | |
| 2024-03-31 | $483,874,075 | 14,349,765 | Shares | Sole | 2024-05-15 | |
| 2023-12-31 | $768,789,378 | 17,849,765 | Shares | Sole | 2024-02-15 | |
| 2023-09-30 | $760,756,984 | 17,849,765 | Shares | Sole | 2023-11-14 | |
| 2023-06-30 | $822,695,668 | 17,849,765 | Shares | Sole | 2023-08-14 | |
| No filing history on record for this holder in this stock. | ||||||