13F

Stock

Ats Corporation

Ticker not mapped · held by 121 managers

Reported value

$2.12B

Holders

121

+3 new · −0 exited

Holders’ est. mark

$6.04M

Price effect on 6 books still in the name

Largest holder

$428.6M

MASON CAPITAL MANAGEMENT LLC

Notable conviction

Share of each notable manager’s 13F book.

Holder count by quarter

Who holds it

Notable only
InvestorSharesValueEst. markChange
MASON CAPITAL MANAGEMENT LLC15.6M$428.6MHeld
ROYAL BANK OF CANADA7.64M$210.5MHeld
EdgePoint Investment Group Inc.6.89M$189.8MHeld
TURTLE CREEK ASSET MANAGEMENT INC.5.64M$155.4MHeld
Vanguard3.4M$93.6MHeld
BANK OF MONTREAL /CAN/3.02M$83.3MHeld
Connor, Clark & Lunn Investment Management Ltd.2.49M$68.5MHeld
FAIRFAX FINANCIAL HOLDINGS LTD/ CAN2.49M$68.3MHeld
Fidelity2.12M$58.3MHeld
ACK Asset Management LLC1.85M$50.8MHeld
Hill City Capital, LP1.65M$45.4MHeld
Alberta Investment Management Corp1.34M$36.9M$1.84MAdded$1.84M
Invesco Ltd.1.27M$35MHeld
Scheer, Rowlett & Associates Investment Management Ltd.1.23M$33.8MHeld
TD Asset Management Inc1.19M$32.9MHeld
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.1.14M$31.5MHeld
VAN LANSCHOT KEMPEN INVESTMENT MANAGEMENT N.V.815K$30.8MHeld
Clearbridge Investments, LLC1.11M$30.6MHeld
BANK OF AMERICA CORP /DE/1.1M$30.3M$1.47MCut−$2.49M
Marathon Asset Management Ltd1.1M$30.3MHeld
NORGES BANK1.08M$29.7M$2.69MAdded$4.11M
TD Waterhouse Canada Inc.966.3K$26.5MHeld
PRINCIPAL FINANCIAL GROUP INC878.2K$24.2MHeld
JANUS HENDERSON GROUP PLC861.8K$23.8MHeld
1832 Asset Management L.P.818.6K$22.5MHeld
MACKENZIE FINANCIAL CORP759K$21.1MHeld
HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND753.5K$20.8MHeld
MASSACHUSETTS FINANCIAL SERVICES CO /MA/558.7K$15.4MHeld
Legal & General Group Plc542K$14.9MHeld
NATIONAL BANK OF CANADA /FI/418.3K$11.5MHeld
AGF MANAGEMENT LTD400.1K$11MHeld
CIBC WORLD MARKET INC.354.1K$9.75MHeld
PUBLIC SECTOR PENSION INVESTMENT BOARD287.8K$7.93MHeld
GOLDMAN SACHS GROUP INC285.4K$7.86MHeld
MONTRUSCO BOLTON INVESTMENTS INC.254.7K$7.02MHeld
CHARLES SCHWAB INVESTMENT MANAGEMENT INC236.3K$6.52MHeld
UBS Group AG228.8K$6.3MHeld
Dixon Mitchell Investment Counsel Inc.211K$5.82MHeld
LOUISBOURG INVESTMENTS INC.207.1K$5.71MHeld
Granite Investment Partners, LLC203.9K$5.61MHeld
SCOTIA CAPITAL INC.195K$5.35MHeld
FIRST TRUST ADVISORS LP184.1K$5.07MHeld
Focus Partners Wealth182K$5.01MHeld
Polar Asset Management Partners Inc.180K$4.96MNew
Swiss National Bank164.4K$4.54MHeld
ROYCE & ASSOCIATES LP164.5K$4.53MHeld
Citadel148.8K$4.1MHeld
CIBC Asset Management Inc131.5K$3.62MHeld
Federation des caisses Desjardins du Quebec116.4K$3.2MHeld
DIMENSIONAL FUND ADVISORS LP110.3K$3.04MHeld
D. E. Shaw & Co., Inc.108.1K$2.98MHeld
SEI INVESTMENTS CO98.7K$2.72MHeld
TORONTO DOMINION BANK81.9K$2.26MHeld
Canoe Financial LP80.6K$2.22MHeld
MANUFACTURERS LIFE INSURANCE COMPANY, THE76.4K$2.11MHeld
MILLENNIUM MANAGEMENT LLC75.9K$2.09MHeld
AYAL Capital Advisors Ltd72.2K$1.99MHeld
Fiera Capital Corp71K$1.96MHeld
Zurcher Kantonalbank (Zurich Cantonalbank)64.6K$1.78MHeld
Nuveen, LLC62.6K$1.73MHeld
Caldwell Investment Management Ltd.60.8K$1.69MHeld
GEODE CAPITAL MANAGEMENT, LLC59.3K$1.67MHeld
LAZARD ASSET MANAGEMENT LLC58.4K$1.61MHeld
FIL Ltd53.6K$1.47MHeld
Aviso Financial Inc.51.7K$1.42MHeld
GUARDIAN CAPITAL LP47.1K$1.3MHeld
BRITISH COLUMBIA INVESTMENT MANAGEMENT Corp43.8K$1.21MHeld
BANK OF NOVA SCOTIA TRUST CO30.5K$840.4KHeld
SIG North Trading, ULC29.3K$808.1KHeld
Purpose Unlimited Inc.28.8K$793.4KHeld
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO27.2K$750.7KHeld
FRANKLIN RESOURCES INC25.4K$699.3KHeld
CITIGROUP INC25.1K$693.7KHeld
Candelo Capital Management LP24.7K$680.2KHeld
JANE STREET GROUP, LLC22.1K$607.9KHeld
MORGAN STANLEY21.5K$591.9K$28.8KCut−$1.23M
Aberdeen Group plc20K$551KHeld
PenderFund Capital Management Ltd.20K$550.9KHeld
Numerai GP LLC16.3K$449KHeld
Pictet Asset Management Holding SA16K$441.5KHeld
STIFEL FINANCIAL CORP12.6K$346.8KHeld
Third View Private Wealth, LLC12.3K$337.8KHeld
Mariner, LLC12.2K$335.1KHeld
TRUE Private Wealth Advisors12.1K$332.7KHeld
Savant Capital, LLC11.4K$313.2KNew
XTX Topco Ltd10.6K$293KHeld
Northwest & Ethical Investments L.P.10.6K$290.7KHeld
DEUTSCHE BANK AG\10.3K$282.6KHeld
Investment Management Corp of Ontario10.1K$278.6KHeld
Rockefeller Capital Management L.P.9.79K$270KHeld
Verition Fund Management LLC9.19K$253.1KHeld
ALLIANCEBERNSTEIN L.P.8.96K$246.8KHeld
Campbell & CO Investment Adviser LLC8.8K$242.5KHeld
Russell Investments Group, Ltd.8.53K$235.3KHeld
ENVESTNET ASSET MANAGEMENT INC7.63K$210.4KHeld
Beutel, Goodman & Co Ltd.5.84M$161KHeld
BARCLAYS PLC5.26K$145K$6.04KAdded$26.9K
Smartleaf Asset Management LLC1.05K$29.2KHeld
Blue Trust, Inc.733$20.2KHeld
WELLS FARGO & COMPANY/MN711$19.6KHeld
Hillsdale Investment Management Inc.600$16.6KHeld
JPMORGAN CHASE & CO553$15.2KHeld
Front Street Capital Management, Inc.287K$7.9KHeld
Van Berkom & Associates Inc.269.1K$7.42KHeld
Farther Finance Advisors, LLC263$7.24KHeld
Banque Cantonale Vaudoise261$7KHeld
Bank of Jackson Hole Trust137$3.77KHeld
Pacer Advisors, Inc.137$3.77KHeld
Larson Financial Group LLC121$3.33KHeld
WealthCollab, LLC89$2.45KHeld
EverSource Wealth Advisors, LLC69$1.9KHeld
BlackRock, Inc.58$1.6KHeld
Root Financial Partners, LLC40$1.1KHeld
JONES FINANCIAL COMPANIES LLLP36$991Held
OSAIC HOLDINGS, INC.30$826Held
Main Management ETF Advisors, LLC29.8K$819Held
Bell Investment Advisors, Inc20$551Held
VAN ECK ASSOCIATES CORP13.6K$374Held
SkyView Investment Advisors, LLC11K$302New
Leonteq Securities AG4$151$5Added$5
HANTZ FINANCIAL SERVICES, INC.173$5Held

Positions as of Q4 2025. 13F filings arrive up to 45 days after quarter-end and omit shorts. Values are quarter-end marks, as filed. Estimated mark is the price effect on shares still held — not realized P&L or investment advice.