13F

Stock

Ats Corporation

Ticker not mapped · held by 128 managers

Reported value

$2.21B

Holders

128

+18 new · −15 exited

Holders’ est. mark

$48.6M

Price effect on 105 books still in the name

Largest holder

$462.6M

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 LLC16.4M$462.6M$10.3MAdded$34M
ROYAL BANK OF CANADA7.76M$218.9M$5.05MAdded$8.36M
EdgePoint Investment Group Inc.7.17M$202.1M$4.44MAdded$12.3M
TURTLE CREEK ASSET MANAGEMENT INC.4.9M$138.1M$3.23MCut−$17.3M
BANK OF MONTREAL /CAN/3.12M$87.8M$1.95MAdded$4.56M
FAIRFAX FINANCIAL HOLDINGS LTD/ CAN2.49M$69.4M$1.07MAdded$1.07M
VANGUARD CAPITAL MANAGEMENT LLC2.37M$66.7MHeld
JANUS HENDERSON GROUP PLC2.3M$64.5M$442.6KAdded$40.8M
Fidelity2.28M$64.2M$1.35MAdded$5.85M
Connor, Clark & Lunn Investment Management Ltd.2.26M$63.8M$1.46MCut−$4.63M
ACK Asset Management LLC1.85M$52.1M$1.22MAdded$1.22M
FIL Ltd1.78M$50.1M$34.4KAdded$48.6M
TD Waterhouse Canada Inc.1.63M$46.9M$1.22MAdded$20.4M
Hill City Capital, LP1.65M$46.5M$1.09MAdded$1.09M
TD Asset Management Inc1.42M$40M$612.1KAdded$7.05M
Vinva Investment Management Ltd2.09M$36.5MNew
VAN LANSCHOT KEMPEN INVESTMENT MANAGEMENT N.V.863.5K$33.9M$1.14MAdded$3.04M
Scheer, Rowlett & Associates Investment Management Ltd.1.18M$33.3M$761KCut−$465.2K
Clearbridge Investments, LLC1.09M$30.8M$720.3KAdded$164.1K
Marathon Asset Management Ltd1.09M$30.7M$560.5KAdded$455.7K
BANK OF AMERICA CORP /DE/945.9K$26.7M$624.3KCut−$3.63M
Alberta Investment Management Corp940.2K$26.5M$607.7KCut−$10.4M
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.758.3K$21.3M$389KCut−$10.2M
MASSACHUSETTS FINANCIAL SERVICES CO /MA/534K$20.9M$6.23MAdded$5.55M
VANGUARD FIDUCIARY TRUST CO728.1K$20.5MHeld
NATIONAL BANK OF CANADA /FI/648.3K$18.1M$219.2KAdded$6.64M
PRINCIPAL FINANCIAL GROUP INC620.8K$17.4M$318.5KCut−$6.78M
MACKENZIE FINANCIAL CORP616.5K$17.4M$272.8KCut−$3.68M
Legal & General Group Plc611.7K$17.2M$345.6KAdded$2.31M
1832 Asset Management L.P.401.7K$11.3M$265.1KCut−$11.2M
PUBLIC SECTOR PENSION INVESTMENT BOARD356.8K$10.1M$185.3KAdded$2.13M
CIBC WORLD MARKET INC.346.6K$9.77M$218.4KAdded$12.8K
Invesco Ltd.343.2K$9.68M$226.5KCut−$25.4M
Vanguard Global Advisers, LLC259K$7.3MHeld
FRANKLIN RESOURCES INC247.5K$6.98M$16.3KAdded$6.28M
CHARLES SCHWAB INVESTMENT MANAGEMENT INC238.7K$6.71M$121.2KAdded$186.5K
UBS Group AG227.6K$6.42M$150.2KAdded$118.7K
Waratah Capital Advisors Ltd.224K$6.32MNew
Dixon Mitchell Investment Counsel Inc.211K$5.93M$108.3KAdded$108.3K
SCOTIA CAPITAL INC.192.5K$5.38M$101.5KAdded$33.2K
Focus Partners Wealth182K$5.13M$120.1KAdded$120.1K
ROYCE & ASSOCIATES LP179.5K$5.06M$105.1KAdded$527.9K
ArrowMark Colorado Holdings LLC174K$4.91MNew
Granite Investment Partners, LLC173K$4.88M$114.2KCut−$735.3K
MONTRUSCO BOLTON INVESTMENTS INC.171K$4.8M$87.7KCut−$2.22M
SEI INVESTMENTS CO167.8K$4.73M$65.2KAdded$2.01M
Swiss National Bank164.4K$4.63M$89KAdded$89K
FIRST TRUST ADVISORS LP154.4K$4.35M$98.7KCut−$720.2K
Candelo Capital Management LP151.7K$4.27M$15.8KAdded$3.59M
CIBC Asset Management Inc134.2K$3.77M$70.2KAdded$145.7K
DIMENSIONAL FUND ADVISORS LP122.5K$3.45M$70.6KAdded$412K
Federation des caisses Desjardins du Quebec113K$3.16M$53.2KCut−$39.1K
MORGAN STANLEY100.4K$2.83M$14.2KAdded$2.24M
TORONTO DOMINION BANK93.2K$2.63M$52.3KAdded$369.9K
Canoe Financial LP87.4K$2.46M$50.6KAdded$243.1K
LOUISBOURG INVESTMENTS INC.84.9K$2.39M$46.1KCut−$3.33M
JANE STREET GROUP, LLC82.6K$2.33M$13.7KAdded$1.72M
Citadel81.2K$2.29M$53.6KCut−$1.81M
MANUFACTURERS LIFE INSURANCE COMPANY, THE74.1K$2.09M$41.3KCut−$22.1K
BRITISH COLUMBIA INVESTMENT MANAGEMENT Corp70.4K$1.99M$28.2KAdded$780K
GEODE CAPITAL MANAGEMENT, LLC68.8K$1.97M$33.7KAdded$307.3K
LAZARD ASSET MANAGEMENT LLC69.9K$1.97M$38.6KAdded$362.5K
VANGUARD ASSET MANAGEMENT, Ltd66.8K$1.88MHeld
Nuveen, LLC62.6K$1.76M$32.1KAdded$32.1K
Caldwell Investment Management Ltd.60.8K$1.65M−$40.3KCut−$40.3K
INTACT INVESTMENT MANAGEMENT INC.53.4K$1.5MNew
GOLDMAN SACHS GROUP INC52.3K$1.47M$34.5KCut−$6.39M
PCJ Investment Counsel Ltd.50K$1.41MNew
GUARDIAN CAPITAL LP47K$1.32M$24.1KAdded$21.1K
Aviso Financial Inc.45.8K$1.29M$27.9KCut−$136.4K
BANK OF NOVA SCOTIA TRUST CO34.3K$968.2K$20.1KAdded$127.8K
Zurcher Kantonalbank (Zurich Cantonalbank)31.4K$883.6K$16.1KCut−$899.3K
D. E. Shaw & Co., Inc.30.2K$851K$19KCut−$2.13M
Purpose Unlimited Inc.28.6K$805.2K$18.3KAdded$11.8K
Numerai GP LLC27.5K$776.6K$10.8KAdded$327.5K
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO27.3K$767.8K$13.8KAdded$17.2K
CITIGROUP INC26.8K$753.4K$12.9KAdded$59.7K
SIG North Trading, ULC26.3K$741K$17.3KCut−$67.1K
Aberdeen Group plc26.2K$739.9K$13.2KAdded$188.9K
ExodusPoint Capital Management, LP22.1K$621.8KNew
PenderFund Capital Management Ltd.20K$563.7K$12.8KAdded$12.8K
Vanguard Investments Australia, Ltd.19.3K$544.4KHeld
Pictet Asset Management Holding SA16.4K$461.4K$8.21KAdded$19.9K
Mariner, LLC16.2K$457.9K$8.01KAdded$122.8K
Balyasny Asset Management L.P.14.1K$398.3KNew
Engineers Gate Manager LP13.1K$368KNew
Savant Capital, LLC12.7K$356.9K$7.51KAdded$43.7K
TRUE Private Wealth Advisors12.1K$340.7K$7.97KAdded$7.97K
STIFEL FINANCIAL CORP11.9K$335.3K$7.85KCut−$11.5K
Investment Management Corp of Ontario11.7K$330.4K$6.68KAdded$51.8K
Northwest & Ethical Investments L.P.11K$309.4K$6.53KAdded$18.6K
DEUTSCHE BANK AG\10.8K$303.2K$6.77KAdded$20.6K
MARSHALL WACE, LLP9.92K$279.7KNew
ALLIANCEBERNSTEIN L.P.8.96K$246.8K$0Held
Campbell & CO Investment Adviser LLC8.43K$237.6K$5.56KCut−$4.85K
Brevan Howard Capital Management LP8.42K$237.6KNew
Orion Porfolio Solutions, LLC7.99K$225.4KNew
Tower Research Capital LLC (TRC)7.9K$222.8KNew
Gotham Asset Management, LLC7.67K$216.3KNew
Beutel, Goodman & Co Ltd.5.45M$153.3K$2.8KCut−$7.75K
BARCLAYS PLC2.98K$84K$1.97KCut−$61K
Russell Investments Group, Ltd.2.83K$79.5K$1.45KCut−$155.8K
WELLS FARGO & COMPANY/MN1.51K$42.4K$425Added$22.8K
State of Wyoming1.22K$34.3KNew
Smartleaf Asset Management LLC1.05K$28.5K−$716Cut−$716
JPMORGAN CHASE & CO963$26.1K−$232Added$10.9K
Blue Trust, Inc.733$20.7K$484Added$484
Hillsdale Investment Management Inc.600$16.9K$350Added$350
OSAIC HOLDINGS, INC.354$9.98K$20Added$9.16K
Farther Finance Advisors, LLC263$7.6K$358Added$358
Front Street Capital Management, Inc.261.1K$7.36K$172Cut−$541
Van Berkom & Associates Inc.257.4K$7.24K$139Cut−$186
Western Wealth Management, LLC236$6.66KNew
Larson Financial Group LLC198$5.58K$80Added$2.25K
Bank of Jackson Hole Trust113$3.19K$75Cut−$586
HARBOR CAPITAL ADVISORS, INC.103.2K$2.91KNew
WealthCollab, LLC89$2.51K$58Added$58
BlackRock, Inc.58$1.64K$39Added$39
EverSource Wealth Advisors, LLC56$1.58K$38Cut−$320
Root Financial Partners, LLC40$1.13K$26Added$26
JONES FINANCIAL COMPANIES LLLP36$1.01K$20Added$20
VAN ECK ASSOCIATES CORP24.3K$684$8Added$310
Bell Investment Advisors, Inc20$564$13Added$13
Caitong International Asset Management Co., Ltd17$479New
SkyView Investment Advisors, LLC11K$309$7Added$7
Leonteq Securities AG4$157$6Added$6
ACADIAN ASSET MANAGEMENT LLC5.4K$151New
HANTZ FINANCIAL SERVICES, INC.2.72K$77−$0Added$72

Who left

Positions as of Q1 2026. 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.