ATS · ATS Corp · Holdings
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Institutional Ownership Trend
Superinvestors Holding ATS
All superinvestors →Holder Concentration
Across 141 13F filersWho Holds ATS
Last 8 quarters through Sep 30, 2026 (filing window open)Each kind of 13F filer's share of the common shares 13F filers report. Holder type comes from regulatory records, never the filer's name; style, turnover and horizon are measured from each filer's own 13F book. The quarter selector does not change this card.
Jun 30, 2026, the newest closed quarter: 141 filers, like-for-like change -5.4%; actively managed books -6.6%; index-like books +18.4%.
| Holder type | Share | Filers | Change |
|---|---|---|---|
| Registered adviser | 49.3% | 56 | -8.1% |
| Adviser | 0.1% | 3 | -82.3% |
| Bank | 16.7% | 10 | +6.2% |
| Insurer | 3.0% | 1 | -20.0% |
| Benefit plan | 0.0% | 1 | +3.8% |
| Non-US | 10.3% | 12 | -22.1% |
| Holding company | 4.3% | 7 | +32.4% |
| Exempt adviser | 0.0% | 0 | -100.0% |
| Broker-dealer | 0.0% | 0 | — |
| Unknown | 16.2% | 51 | +4.5% |
| Style | Share | Filers | Change |
|---|---|---|---|
| Index-like | 7.6% | 15 | +18.4% |
| Systematic-like | 0.5% | 8 | +126.2% |
| Concentrated | 40.0% | 21 | +1.3% |
| Diversified active | 51.9% | 97 | -12.4% |
| Not measured | 0.0% | 0 | — |
| Unknown | 0.0% | 0 | — |
| Turnover | Share | Filers | Change |
|---|---|---|---|
| Low turnover | 61.1% | 64 | -2.1% |
| Medium turnover | 25.6% | 40 | -18.7% |
| High turnover | 3.8% | 23 | +21.9% |
| Unknown | 9.5% | 14 | +12.6% |
| Not measured | 0.0% | 0 | — |
| Holding horizon | Share | Filers | Change |
|---|---|---|---|
| Short horizon | 8.8% | 22 | +16.9% |
| Medium horizon | 3.9% | 19 | -38.1% |
| Long horizon | 59.8% | 89 | -7.7% |
| Unknown | 27.4% | 11 | +1.7% |
| Not measured | 0.0% | 0 | — |
| 13F book size | Share | Filers | Change |
|---|---|---|---|
| Under $1B | 24.4% | 24 | +4.2% |
| $1B to $10B | 14.0% | 37 | -12.6% |
| $10B to $100B | 24.9% | 36 | -15.6% |
| $100B or more | 36.8% | 44 | +0.1% |
| Not measured | 0.0% | 0 | — |
| Client base | Share | Filers | Change |
|---|---|---|---|
| Individuals and high net worth | 0.5% | 15 | +4.0% |
| Pooled investment vehicles | 33.3% | 19 | +2.0% |
| Registered funds and BDCs | 4.8% | 9 | -0.6% |
| Governments and sovereign funds | 0.2% | 1 | -26.9% |
| Other investment advisers | 0.1% | 2 | +69.8% |
| Diversified | 10.3% | 10 | -18.7% |
| Corporations | 0.0% | 0 | -100.0% |
| Pension and profit sharing plans | 0.0% | 0 | — |
| Unknown | 50.7% | 85 | -2.5% |
| Private funds | Share | Filers | Change |
|---|---|---|---|
| Hedge funds | 26.0% | 21 | -2.4% |
| Private equity funds | 0.5% | 5 | +7.9% |
| Real estate funds | 0.0% | 1 | -64.3% |
| Liquidity funds | 0.2% | 1 | +3.0% |
| Other private funds | 1.2% | 5 | -17.8% |
| Mixed private funds | 2.0% | 2 | +0.4% |
| Private funds, type not stated | 0.9% | 4 | +9.7% |
| No private funds | 18.4% | 17 | -16.3% |
| Securitized asset funds | 0.0% | 0 | — |
| Unknown | 50.7% | 85 | -2.5% |
| Location | Share | Filers | Change |
|---|---|---|---|
| United States | 42.3% | 77 | +0.5% |
| Outside the US | 57.7% | 64 | -9.3% |
The Sep 30, 2026 filing window is still open, so its bar carries the Jun 30, 2026 positions of filers that have not filed yet.
How the mix is measured
Shares are 13F common shares restated to today's split basis; options and principal amounts are left out. The change compares only filers with a 13F in both quarters and keeps each filer in its bucket of the later quarter on both sides; a filer that continues under a new CIK is compared through its successor. Holder type comes from each filer's current regulatory profile; client base and private funds come from the Form ADV roster current at each quarter end (rosters from December 2019, so an earlier quarter reads Unknown). Style, turnover, horizon and book size are measured from each filer's 13F book in the newest measured quarter, and Not measured means none was. Actively managed books are those measured systematic-like, concentrated or diversified active.
Excluded 2 holders with no observed 2026-03-31 13F and 1 holder with no observed 2026-06-30 13F. Compared across CIK changes: JANUS HENDERSON GROUP PLC continues as Jupiter Topco LLC.
Conviction and Crowding
141 13F filers, quarter ended Jun 30, 2026Measured across every 13F filer's common-share book once the quarter's filing window closed. Crowding counts filers with high turnover or that advise private funds on Form ADV.
Managers in the top fifth by current three-year FundScore alpha were net buyers of $0 (0 buying, 0 selling).
Estimated Holder Cost Basis
Quarter ended Jun 30, 2026, on that quarter's share basisEstimated, never filed: each 13F buy is costed at its quarter's average traded price and each sale keeps the average cost, so this is what holders paid on average if they traded evenly through each quarter.
Estimated cost covers 91.2% of the 13F shares; positions already held when a filer's 13F history starts, or bought in a quarter without a trusted average price, have no estimate.
Shared Holders
Companies ATS's active holders also own, quarter ended Jun 30, 2026| # | Company | Shared holders |
|---|---|---|
| 1 | BGSI Boyd Group Services Inc. | 9 |
| 2 | CIGI Colliers International Group Inc. | 10 |
| 3 | TFII TFI International Inc. | 11 |
| 4 | DCBO Docebo Inc. | 4 |
| 5 | GIB Cgi Inc | 10 |
| 6 | MDA MDA Space Ltd. | 7 |
| 7 | CAE Cae Inc | 8 |
| 8 | LSPD Lightspeed Commerce Inc. | 4 |
| 9 | GIL Gildan Activewear Inc. | 11 |
| 10 | TRI Thomson Reuters Corp | 9 |
Shareholder Targets
13F filers that own its peers but not ATS, quarter ended Jun 30, 2026Found through its holder-overlap peers: BGSI, CIGI, TFII, DCBO, GIB, MDA, CAE, LSPD, GIL, TRI, STN, DSGX, DOO, FSV, BNS, EFXT, PBA, TSAT, OR, BMO. 1,385 filers in all.
| # | Filer | In peers | Largest peers |
|---|---|---|---|
| 1 | Woodbridge Co Ltd Unknown, Concentrated | $24,194,499,431 1 held | TRI |
| 2 | Caisse de depot et placement du Quebec Unknown, Diversified active | $4,808,046,436 11 held | GIB, BMO, TFII |
| 3 | CANADA PENSION PLAN INVESTMENT BOARD Non-US, Diversified active | $3,003,261,415 12 held | BMO, BNS, PBA |
| 4 | Fiera Capital Corp Non-US, Diversified active | $1,435,971,086 9 held | BMO, GIB, STN |
| 5 | HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND Non-US, Diversified active | $1,414,520,150 9 held | BMO, BNS, PBA |
| 6 | BANK OF NOVA SCOTIA Bank, Diversified active | $1,319,032,376 12 held | BMO, PBA, TRI |
| 7 | PRICE T ROWE ASSOCIATES INC /MD/ Registered adviser, Diversified active | $1,032,129,840 6 held | DSGX, OR, CIGI |
| 8 | MHR FUND MANAGEMENT LLC Unknown, Concentrated | $912,936,357 1 held | TSAT |
| 9 | Amundi Holding company, Index-like | $892,819,119 15 held | BNS, BMO, PBA |
| 10 | LETKO, BROSSEAU & ASSOCIATES INC Registered adviser, Diversified active | $744,362,453 6 held | BNS, BMO, CAE |
Fund Ownership of ATS by Fund Type
Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026Index funds and index ETFs hold 4.83% of shares outstanding.
| Fund type | Of shares outstanding | Shares |
|---|---|---|
| Index funds | 0.09% | 86,859 |
| Index ETFs | 4.74% | 4,651,296 |
| Active ETFs | 0.54% | 533,285 |
| Active funds | 5.85% | 5,736,873 |
| Unclassified | 0.02% | 19,498 |
| All registered funds | 11.24% | 11,027,811 |
How fund types are measured
Each fund series counts once, with its latest Form N-PORT report dated inside the quarter; only long share positions count, restated to today's split basis. The fund type is the series' latest Form N-CEN answer on or before the quarter end (the index-fund box and the exchange-traded flag), never its name. Unclassified funds have no usable N-CEN; unit investment trusts are among them, so index ownership is a floor. Funds sit inside their advisers' 13F reports, so these shares overlap the 13F figures and are never added to them.
| Holder | Value (USD) | % of 13F | Shares | Type | Filed | Open |
|---|---|---|---|---|---|---|
| Small MASON CAPITAL MANAGEMENT LLC Registered adviser | $472,112,012 | 20.39% | 16,404,170 | Shares | 2026-08-14 | |
| Mega ROYAL BANK OF CANADA Bank | $226,827,351 | 9.80% | 7,881,423 | Shares | 2026-08-14 | |
| Large EdgePoint Investment Group Inc. Registered adviser | $201,591,726 | 8.71% | 7,004,577 | Shares | 2026-08-14 | |
| Large Beutel, Goodman & Co Ltd. Registered adviser | $138,055,415 | 5.96% | 4,796,922 | Shares | 2026-08-12 | |
| Mid TURTLE CREEK ASSET MANAGEMENT INC. Non-US | $88,773,838 | 3.83% | 3,084,567 | Shares | 2026-08-14 | |
| Mega BANK OF MONTREAL /CAN/ Bank | $88,152,362 | 3.81% | 3,062,973 | Shares | 2026-08-12 | |
| Mega FMR LLC Holding company | $83,619,023 | 3.61% | 2,905,456 | Shares | 2026-08-13 | |
| Mid FAIRFAX FINANCIAL HOLDINGS LTD/ CAN Insurer | $71,558,592 | 3.09% | 2,486,400 | Shares | 2026-08-14 | |
| Mega VANGUARD CAPITAL MANAGEMENT LLC Registered adviser | $69,026,844 | 2.98% | 2,398,431 | Shares | 2026-08-13 | |
| Mega Jupiter Topco LLC | $66,829,260 | 2.89% | 2,322,073 | Shares | 2026-08-14 | |
| Mid Hill City Capital, LP Registered adviser | $47,482,884 | 2.05% | 1,649,857 | Shares | 2026-08-17 | |
| Small ACK Asset Management LLC | $43,170,000 | 1.86% | 1,500,000 | Shares | 2026-08-13 | |
| Mega FIL Ltd Non-US | $38,186,771 | 1.65% | 1,326,851 | Shares | 2026-08-13 | |
| Large Alberta Investment Management Corp Non-US | $33,888,190 | 1.46% | 1,177,491 | Shares | 2026-08-06 | |
| Mid Scheer, Rowlett & Associates Investment Management Ltd. | $33,824,213 | 1.46% | 1,175,268 | Shares | 2026-08-13 | |
| Mega BANK OF AMERICA CORP /DE/ Bank | $32,295,532 | 1.39% | 1,122,152 | Shares | 2026-08-14 | |
| Large Connor, Clark & Lunn Investment Management Ltd. Registered adviser | $31,354,658 | 1.35% | 1,089,460 | Shares | 2026-08-13 | |
| Mega NORGES BANK Non-US | $31,202,729 | 1.35% | 1,084,181 | Shares | 2026-08-12 | |
| Mega Clearbridge Investments, LLC Registered adviser | $30,520,815 | 1.32% | 1,060,487 | Shares | 2026-08-13 | |
| Mega Legal & General Group Plc | $30,403,421 | 1.31% | 1,056,408 | Shares | 2026-08-14 | |
| Mega TD Asset Management Inc | $28,883,492 | 1.25% | 1,003,596 | Shares | 2026-08-04 | |
| Large TD Waterhouse Canada Inc. | $28,881,570 | 1.25% | 1,600,087 | Shares | 2026-10-16 | |
| Mega NATIONAL BANK OF CANADA /FI/ Bank | $24,615,992 | 1.06% | 855,316 | Shares | 2026-08-10 | |
| Large VAN LANSCHOT KEMPEN INVESTMENT MANAGEMENT N.V. Non-US | $22,897,914 | 0.99% | 795,619 | Shares | 2026-08-14 | |
| Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | $22,701,203 | 0.98% | 788,784 | Shares | 2026-08-14 | |
| Mega VANGUARD FIDUCIARY TRUST CO | $20,844,519 | 0.90% | 724,271 | Shares | 2026-08-13 | |
| Small Langdon Equity Partners | $17,268,000 | 0.75% | 600,000 | Shares | 2026-08-13 | |
| Mega MASSACHUSETTS FINANCIAL SERVICES CO /MA/ Registered adviser | $15,562,295 | 0.67% | 540,733 | Shares | 2026-08-03 | |
| Large MACKENZIE FINANCIAL CORP Registered adviser | $15,102,995 | 0.65% | 524,774 | Shares | 2026-08-13 | |
| Mid Marathon Asset Management Ltd Registered adviser | $13,213,394 | 0.57% | 732,044 | Shares | 2026-10-26 | |
| Large TORONTO DOMINION BANK Bank | $11,711,042 | 0.51% | 406,916 | Shares | 2026-08-14 | |
| Large Public Sector Pension Investment Board Non-US | $10,878,868 | 0.47% | 378,001 | Shares | 2026-08-13 | |
| Large 1832 Asset Management L.P. Non-US | $10,238,341 | 0.44% | 355,745 | Shares | 2026-08-13 | |
| Mid Waratah Capital Advisors Ltd. Registered adviser | $9,639,083 | 0.42% | 334,923 | Shares | 2026-08-11 | |
| Large CIBC WORLD MARKET INC. | $9,413,563 | 0.41% | 327,087 | Shares | 2026-08-13 | |
| Mid ArrowMark Colorado Holdings LLC Registered adviser | $8,058,400 | 0.35% | 280,000 | Shares | 2026-08-13 | |
| Mega Vanguard Global Advisers, LLC Registered adviser | $7,888,684 | 0.34% | 274,103 | Shares | 2026-08-13 | |
| Small Roubaix Capital, LLC Registered adviser | $7,106,041 | 0.31% | 246,909 | Shares | 2026-08-10 | |
| Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC Registered adviser | $7,008,649 | 0.30% | 243,525 | Shares | 2026-08-14 | |
| Mega MORGAN STANLEY Holding company | $6,741,308 | 0.29% | 234,236 | Shares | 2026-08-13 | |
| Mega GOLDMAN SACHS GROUP INC Holding company | $6,439,869 | 0.28% | 223,762 | Shares | 2026-08-14 | |
| Mega UBS Group AG Bank | $6,405,074 | 0.28% | 222,553 | Shares | 2026-08-13 | |
| Large SCOTIA CAPITAL INC. | $6,122,052 | 0.26% | 212,719 | Shares | 2026-08-11 | |
| Mid Dixon Mitchell Investment Counsel Inc. | $6,073,299 | 0.26% | 211,025 | Shares | 2026-08-13 | |
| Mega JANE STREET GROUP, LLC | $5,745,495 | 0.25% | 199,635 | Shares | 2026-08-14 | |
| Mid Granite Investment Partners, LLC Registered adviser | $5,637,829 | 0.24% | 195,894 | Shares | 2026-08-07 | |
| Mid Van Berkom & Associates Inc. Registered adviser | $5,412,539 | 0.23% | 188,066 | Shares | 2026-08-05 | |
| Large Focus Partners Wealth Registered adviser | $5,237,240 | 0.23% | 181,975 | Shares | 2026-08-12 | |
| Mega FIRST TRUST ADVISORS LP Registered adviser | $5,226,217 | 0.23% | 181,592 | Shares | 2026-08-11 | |
| Mega Swiss National Bank | $4,835,040 | 0.21% | 168,000 | Shares | 2026-08-11 | |
| Mega DIMENSIONAL FUND ADVISORS LP Registered adviser | $4,810,547 | 0.21% | 167,149 | Shares | 2026-08-11 | |
| Small Candelo Capital Management LP Registered adviser | $4,751,578 | 0.21% | 165,100 | Shares | 2026-08-14 | |
| Mid SIG North Trading, ULC | $4,622,068 | 0.20% | 160,600 | Put | 2026-08-14 | |
| Small Delaney Capital Management Ltd. | $4,616,081 | 0.20% | 160,392 | Shares | 2026-08-14 | |
| Small NewGen Asset Management Ltd Registered adviser | $4,317,000 | 0.19% | 150,000 | Shares | 2026-08-13 | |
| Large CIBC Asset Management Inc Registered adviser | $3,978,719 | 0.17% | 138,246 | Shares | 2026-08-03 | |
| Small Front Street Capital Management, Inc. | $3,596,722 | 0.16% | 124,973 | Shares | 2026-08-14 | |
| Mid Polar Asset Management Partners Inc. Registered adviser | $3,027,742 | 0.13% | 105,203 | Shares | 2026-08-14 | |
| Large BRITISH COLUMBIA INVESTMENT MANAGEMENT Corp | $2,922,493 | 0.13% | 101,546 | Shares | 2026-08-13 | |
| Small K.J. Harrison & Partners Inc | $2,878,000 | 0.12% | 100,000 | Shares | 2026-08-07 | |
| Mega SEI INVESTMENTS CO Holding company | $2,802,481 | 0.12% | 97,376 | Shares | 2026-08-14 | |
| Small PCJ Investment Counsel Ltd. Registered adviser | $2,464,719 | 0.11% | 85,640 | Shares | 2026-08-12 | |
| Large LAZARD ASSET MANAGEMENT LLC Adviser | $2,390,236 | 0.10% | 83,052 | Shares | 2026-08-14 | |
| Small HALLSTATT ADVISORS L.P. | $2,389,315 | 0.10% | 83,020 | Shares | 2026-08-04 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $2,368,823 | 0.10% | 82,308 | Shares | 2026-09-02 | |
| Small LOUISBOURG INVESTMENTS INC. Registered adviser | $2,334,081 | 0.10% | 129,312 | Shares | 2026-10-20 | |
| Mid HARBOR CAPITAL ADVISORS, INC. Registered adviser | $2,215,763 | 0.10% | 122,757 | Shares | 2026-10-22 | |
| Large TORONTO DOMINION BANK Bank | $2,121,086 | 0.09% | 73,700 | Put | 2026-08-14 | |
| Mega MANUFACTURERS LIFE INSURANCE COMPANY, THE Non-US | $2,119,762 | 0.09% | 73,654 | Shares | 2026-09-09 | |
| Mega GEODE CAPITAL MANAGEMENT, LLC Registered adviser | $2,003,030 | 0.09% | 69,598 | Shares | 2026-08-12 | |
| Mega VANGUARD ASSET MANAGEMENT, Ltd | $1,923,367 | 0.08% | 66,830 | Shares | 2026-08-13 | |
| Mid CenterBook Partners LP Registered adviser | $1,875,880 | 0.08% | 65,180 | Shares | 2026-08-11 | |
| Mega Nuveen, LLC | $1,801,167 | 0.08% | 62,584 | Shares | 2026-08-11 | |
| Small Caldwell Investment Management Ltd. | $1,749,824 | 0.08% | 60,800 | Shares | 2026-08-11 | |
| Mid BOOTHBAY FUND MANAGEMENT, LLC Registered adviser | $1,722,972 | 0.07% | 59,867 | Shares | 2026-08-14 | |
| Large Federation des caisses Desjardins du Quebec | $1,581,374 | 0.07% | 54,947 | Shares | 2026-08-14 | |
| Large Zurcher Kantonalbank (Zurich Cantonalbank) Non-US | $1,564,509 | 0.07% | 54,361 | Shares | 2026-08-12 | |
| Mega VAN ECK ASSOCIATES CORP Registered adviser | $1,338,471 | 0.06% | 46,507 | Shares | 2026-08-14 | |
| Mid GUARDIAN CAPITAL LP Registered adviser | $1,336,341 | 0.06% | 46,433 | Shares | 2026-08-14 | |
| Mid INTACT INVESTMENT MANAGEMENT INC. | $1,165,273 | 0.05% | 40,489 | Shares | 2026-07-20 | |
| Mid Aviso Financial Inc. | $1,154,394 | 0.05% | 40,111 | Shares | 2026-08-13 | |
| Small PenderFund Capital Management Ltd. Non-US | $1,085,006 | 0.05% | 37,700 | Shares | 2026-08-17 | |
| Mega CITIGROUP INC Bank | $1,054,815 | 0.05% | 36,651 | Shares | 2026-08-03 | |
| Mid BANK OF NOVA SCOTIA TRUST CO | $1,015,674 | 0.04% | 35,291 | Shares | 2026-08-11 | |
| Mid XTX Topco Ltd | $1,007,674 | 0.04% | 35,013 | Shares | 2026-08-14 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $1,001,284 | 0.04% | 34,791 | Shares | 2026-08-14 | |
| Mega AMERICAN CENTURY COMPANIES INC | $935,350 | 0.04% | 32,500 | Shares | 2026-08-12 | |
| Mid Engineers Gate Manager LP | $902,627 | 0.04% | 31,363 | Shares | 2026-08-14 | |
| Large Verition Fund Management LLC Registered adviser | $849,384 | 0.04% | 29,513 | Shares | 2026-08-14 | |
| Large PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO Benefit plan | $816,373 | 0.04% | 28,366 | Shares | 2026-08-17 | |
| Mid SIG North Trading, ULC | $791,450 | 0.03% | 27,500 | Call | 2026-08-14 | |
| Mega FRANKLIN RESOURCES INC Adviser | $731,356 | 0.03% | 25,412 | Shares | 2026-08-13 | |
| Large Squarepoint Ops LLC Registered adviser | $712,592 | 0.03% | 24,760 | Shares | 2026-08-14 | |
| Mid Canoe Financial LP | $666,875 | 0.03% | 36,946 | Shares | 2026-10-21 | |
| Mid SIG North Trading, ULC | $649,708 | 0.03% | 22,575 | Shares | 2026-08-14 | |
| Large ExodusPoint Capital Management, LP Registered adviser | $636,038 | 0.03% | 22,100 | Shares | 2026-08-14 | |
| Large Vanguard Investments Australia, Ltd. | $629,533 | 0.03% | 21,874 | Shares | 2026-08-13 | |
| Mega WELLS FARGO & COMPANY/MN Bank | $568,346 | 0.02% | 19,748 | Shares | 2026-08-14 | |
| Mega BARCLAYS PLC Bank | $483,906 | 0.02% | 16,814 | Shares | 2026-08-14 | |
| Mega ALLIANCEBERNSTEIN L.P. Registered adviser | $471,416 | 0.02% | 16,380 | Shares | 2026-08-14 |
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