Comparable stake leader
ROYAL BANK OF CANADA
SEC ownership of ATS Corp /ATS
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001394832.
Disclosed value leader
MASON CAPITAL MANAGEMENT LLC
Comparable rows
50/50
Latest evidence
31 Mar 2026
- Public ticker
- ATS on NYSE
- Parsed ownership sources
-
13F and 13D/G
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
ROYAL BANK OF CANADA
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
ROYAL BANK OF CANADA
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
31 Mar 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001394832
- Issuer location
- Cambridge, Ontario, Canada
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of ATS Corp /ATS (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
ROYAL BANK OF CANADA
Disclosed value leader
MASON CAPITAL MANAGEMENT LLC
Comparable rows
50/50
Latest evidence
31 Mar 2026
13F
13D/G
Lead comparable stake: 6.6%
13D/G row: ROYAL BANK OF CANADA
Showing 1-8 of 50 holder rows.
Quick read
ROYAL BANK OF CANADA leads the comparable SEC ownership view at 6.6%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens ROYAL BANK OF CANADA's linked filing trail.
Comparable ownership
Top 5
ROYAL BANK OF CANADA
6.6%
EdgePoint Investment Group Inc.
6.6%
Turtle Creek Asset Management Inc.
5%
BANK OF NOVA SCOTIA
1.5%
MASON CAPITAL MANAGEMENT LLC
17%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| ROYAL BANK OF CANADA |
13F
13D/G
Company
|
6.6%
from 13D/G
|
$218,884,000
7,761,838 shares
|
— | 31 Mar 2026 |
| EdgePoint Investment Group Inc. |
13F
13D/G
Company
|
6.6%
from 13D/G
|
$202,081,247
7,168,112 shares
|
— | 31 Mar 2026 |
| Turtle Creek Asset Management Inc. |
13D/G
13F
Company
|
5%
|
$154,440,940
4,896,669 shares
|
-$23,509,380 | 31 Mar 2026 |
| BANK OF NOVA SCOTIA |
13D/G
|
1.5%
|
$45,991,935
1,443,772 shares
|
-$119,696,952 | 30 Jun 2025 |
| MASON CAPITAL MANAGEMENT LLC |
13F
Company
|
17%
|
$462,597,594
16,404,170 shares
|
— | 31 Mar 2026 |
| Beutel, Goodman & Co Ltd. |
13F
Company
|
5.6%
|
$153,259,000
5,454,749 shares
|
— | 31 Mar 2026 |
| BANK OF MONTREAL /CAN/ |
13F
Company
|
3.2%
|
$87,827,288
3,115,360 shares
|
— | 31 Mar 2026 |
| FAIRFAX FINANCIAL HOLDINGS LTD/ CAN |
13F
Company
|
2.5%
|
$69,352,987
2,486,400 shares
|
— | 31 Mar 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 17 Jul 2025.
Buys
$0
Insiders: 0
Sells
$0
Insiders: 0
Net
$0
Shares: 0
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Recent insider transactions for ATS Corp /ATS
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| No insider transactions were found in the last 12 months for this issuer. | ||||||||||
* marks a reported price that did not pass the local price check.