Who Owns ATS (ATS)? -- Institutional Holders (2026-06-30)

153 institutions reported holding $2.38B of ATS (ATS) in SEC 13F filings for 2026-06-30. Largest institutional holders: MASON CAPITAL MANAGEMENT LLC ($472.1M), Royal Bank of Canada ($226.8M), EdgePoint Investment Group Inc. ($201.7M), Beutel, Goodman & Co Ltd. ($138.2M), VANGUARD GROUP INC ($100.5M). Source: SEC Form 13F.

RankInstitutionValueSharesChange
1MASON CAPITAL MANAGEMENT LLC$472.1M16.4MHold
2Royal Bank of Canada$226.8M7.9MAdded
3EdgePoint Investment Group Inc.$201.7M7.0MTrimmed
4Beutel, Goodman & Co Ltd.$138.2M4.8MTrimmed
5VANGUARD GROUP INC$100.5M3.5MAdded
6TURTLE CREEK ASSET MANAGEMENT INC.$88.8M3.1MTrimmed
7BANK OF MONTREAL /CAN/$88.2M3.1MTrimmed
8FMR LLC$83.7M2.9MAdded
9FAIRFAX FINANCIAL HOLDINGS LTD/ CAN$70.5M2.5MHold
10Jupiter Topco LLC$66.9M2.3MNew
11Hill City Capital, LP$47.5M1.6MHold
12TD Waterhouse Canada Inc.$47.4M1.7MAdded
13ACK Asset Management LLC$43.2M1.5MTrimmed
14FIL Ltd$38.2M1.3MTrimmed
15Alberta Investment Management Corp$33.9M1.2MAdded
16Scheer, Rowlett & Associates Investment Management Ltd.$33.8M1.2MTrimmed
17VAN LANSCHOT KEMPEN INVESTMENT MANAGEMENT N.V.$32.5M795,619Trimmed
18BANK OF AMERICA CORP /DE/$32.3M1.1MAdded
19Connor, Clark & Lunn Investment Management Ltd.$31.4M1.1MTrimmed
20NORGES BANK$31.2M1.1MAdded
21Clearbridge Investments, LLC$30.5M1.1MTrimmed
22Legal & General Group Plc$30.4M1.1MAdded
23TD Asset Management Inc$28.9M1.0MTrimmed
24Marathon Asset Management Ltd$27.5M954,485Trimmed
25NATIONAL BANK OF CANADA /FI/$24.2M855,316Added

Source: SEC Form 13F filings · as of 2026-06-30