ATS Corp /ATS (ATS) — Institutional Holders, Q2 2026
141 institutional investment managers reported a ATS position on SEC Form 13F-HR for the quarter ended June 30, 2026, with a combined reported value of $2.4B. Every filer is listed below, ranked by position value, 100 per page; this page shows ranks 1 to 100. Put and call option positions are excluded, and a firm filing several lots or share classes is shown once with its total.
ATS in Q2 2026: what funds did
Funds that filed a 13F for both Q1 2026 and Q2 2026, by what they did with the common stock. Share counts are adjusted for any split between the two quarters; dollar figures are the change in shares at this quarter’s price.
Biggest buyers
- FMRAdded · +627,984 sh+$18.1M
- Langdon Equity PartnersNew · +600,000 sh+$17.3M
- Legal & General Group PlcAdded · +444,719 sh+$12.8M
- TORONTO DOMINION BANKAdded · +313,741 sh+$9.0M
- Roubaix CapitalNew · +246,909 sh+$7.1M
Biggest sellers
- Turtle Creek Asset ManagementTrimmed · -7,301,252 sh-$210.1M
- Vinva Investment Management LtdSold out · -2,088,947 sh-$60.1M
- Connor, Clark & Lunn Investment Management Ltd.Trimmed · -1,175,297 sh-$33.8M
- Beutel, Goodman & Ltd.Trimmed · -657,827 sh-$18.9M
- PRINCIPAL FINANCIAL GROUPSold out · -620,840 sh-$17.9M
ATS 13F holders ranked 1–100 of 141
| # | Institution | Shares | Value | % of portfolio | QoQShares vs Q1 2026 |
|---|---|---|---|---|---|
| 1 | MASON CAPITAL MANAGEMENT#1 · 16,404,170 sh | 16,404,170 | $472.1M | 77.78% | 0.0% |
| 2 | ROYAL BANK OF CANADA#2 · 7,881,423 sh | 7,881,423 | $226.8M | 0.03% | +1.5% |
| 3 | EdgePoint Investment Group#3 · 7,004,577 sh | 7,004,577 | $201.7M | 1.52% | -2.3% |
| 4 | Beutel, Goodman & Ltd.#4 · 4,796,922 sh | 4,796,922 | $138.2M | 1.02% | -12.1% |
| 5 | Turtle Creek Asset Management#5 · 3,084,567 sh | 3,084,567 | $88.8M | 3.47% | -70.3% |
| 6 | BANK OF MONTREAL#6 · 3,062,973 sh | 3,062,973 | $88.2M | 0.03% | -1.7% |
| 7 | FMR#7 · 2,905,456 sh | 2,905,456 | $83.7M | <0.01% | +27.6% |
| 8 | FAIRFAX FINANCIAL LTD/ CAN#8 · 2,486,400 sh | 2,486,400 | $70.5M | 2.67% | 0.0% |
| 9 | VANGUARD CAPITAL MANAGEMENT#9 · 2,398,431 sh | 2,398,431 | $69.1M | <0.01% | +1.3% |
| 10 | Jupiter Topco#10 · 2,322,073 sh | 2,322,073 | $66.9M | 0.03% | — |
| 11 | Hill City Capital#11 · 1,649,857 sh | 1,649,857 | $47.5M | 1.21% | 0.0% |
| 12 | TD Waterhouse Canada#12 · 1,683,683 sh | 1,683,683 | $47.4M | — | +3.0% |
| 13 | ACK Asset Management#13 · 1,500,000 sh | 1,500,000 | $43.2M | 5.04% | -18.8% |
| 14 | FIL Ltd#14 · 1,326,851 sh | 1,326,851 | $38.2M | 0.03% | -25.4% |
| 15 | Alberta Investment Management#15 · 1,177,491 sh | 1,177,491 | $33.9M | 0.19% | +25.2% |
| 16 | Scheer, Rowlett & Associates Investment Management Ltd.#16 · 1,175,268 sh | 1,175,268 | $33.8M | 2.43% | -0.6% |
| 17 | VAN LANSCHOT KEMPEN INVESTMENT MANAGEMENT N.V.#17 · 795,619 sh | 795,619 | $32.5M | 0.25% | -7.9% |
| 18 | BANK OF AMERICA#18 · 1,122,152 sh | 1,122,152 | $32.3M | <0.01% | +18.6% |
| 19 | Connor, Clark & Lunn Investment Management Ltd.#19 · 1,089,460 sh | 1,089,460 | $31.4M | 0.06% | -51.9% |
| 20 | NORGES BANK#20 · 1,084,181 sh | 1,084,181 | $31.2M | <0.01% | — |
| 21 | Clearbridge Investments#21 · 1,060,487 sh | 1,060,487 | $30.5M | 0.03% | -2.8% |
| 22 | Legal & General Group Plc#22 · 1,056,408 sh | 1,056,408 | $30.4M | <0.01% | +72.7% |
| 23 | TD ASSET MANAGEMENT#23 · 1,003,596 sh | 1,003,596 | $28.9M | 0.03% | -29.4% |
| 24 | Marathon Asset Management Ltd#24 · 954,485 sh | 954,485 | $27.5M | — | -12.7% |
| 25 | NATIONAL BANK OF CANADA#25 · 855,316 sh | 855,316 | $24.2M | 0.02% | +31.9% |
| 26 | MIRAE ASSET GLOBAL ETFS Ltd.#26 · 788,784 sh | 788,784 | $22.7M | 0.03% | +4.0% |
| 27 | MASSACHUSETTS FINANCIAL SERVICES#27 · 540,733 sh | 540,733 | $22.1M | <0.01% | +1.3% |
| 28 | MACKENZIE FINANCIAL#28 · 524,774 sh | 524,774 | $21.5M | 0.02% | -14.9% |
| 29 | VANGUARD FIDUCIARY#29 · 724,271 sh | 724,271 | $20.9M | <0.01% | -0.5% |
| 30 | Langdon Equity Partners#30 · 600,000 sh | 600,000 | $17.3M | 9.66% | New |
| 31 | TORONTO DOMINION BANK#31 · 406,916 sh | 406,916 | $11.7M | 0.01% | +336.7% |
| 32 | PUBLIC SECTOR PENSION INVESTMENT BOARD#32 · 378,001 sh | 378,001 | $10.9M | 0.03% | +5.9% |
| 33 | 1832 Asset Management L.P.#33 · 355,745 sh | 355,745 | $10.2M | <0.01% | -11.4% |
| 34 | Waratah Capital Advisors Ltd.#34 · 334,923 sh | 334,923 | $9.6M | 0.33% | +49.5% |
| 35 | CIBC WORLD MARKET#35 · 327,087 sh | 327,087 | $9.4M | 0.02% | -5.6% |
| 36 | ArrowMark Colorado#36 · 280,000 sh | 280,000 | $8.1M | 0.34% | +60.9% |
| 37 | Vanguard Global Advisers#37 · 274,103 sh | 274,103 | $7.9M | <0.01% | +5.8% |
| 38 | Roubaix Capital#38 · 246,909 sh | 246,909 | $7.1M | 2.55% | New |
| 39 | CHARLES SCHWAB INVESTMENT MANAGEMENT#39 · 243,525 sh | 243,525 | $7.0M | <0.01% | +2.0% |
| 40 | MORGAN STANLEY#40 · 234,236 sh | 234,236 | $6.7M | <0.01% | +133.3% |
| 41 | GOLDMAN SACHS GROUP#41 · 223,762 sh | 223,762 | $6.4M | <0.01% | +328.2% |
| 42 | UBS Group AG#42 · 222,553 sh | 222,553 | $6.4M | <0.01% | -2.2% |
| 43 | Dixon Mitchell Investment Counsel#43 · 211,025 sh | 211,025 | $6.1M | 0.20% | 0.0% |
| 44 | SCOTIA CAPITAL#44 · 212,719 sh | 212,719 | $6.0M | 0.02% | +10.5% |
| 45 | JANE STREET GROUP#45 · 199,635 sh | 199,635 | $5.7M | <0.01% | +141.6% |
| 46 | Granite Investment Partners#46 · 195,894 sh | 195,894 | $5.6M | 0.29% | +13.2% |
| 47 | Van Berkom & Associates#47 · 188,066 sh | 188,066 | $5.4M | 0.17% | -26.9% |
| 48 | Focus Partners Wealth#48 · 181,975 sh | 181,975 | $5.2M | <0.01% | 0.0% |
| 49 | FIRST ADVISORS#49 · 181,592 sh | 181,592 | $5.2M | <0.01% | +17.6% |
| 50 | Swiss National Bank#50 · 168,000 sh | 168,000 | $4.8M | <0.01% | +2.2% |
| 51 | DIMENSIONAL FUND ADVISORS#51 · 167,149 sh | 167,149 | $4.8M | <0.01% | +36.5% |
| 52 | Candelo Capital Management#52 · 165,100 sh | 165,100 | $4.8M | 2.93% | +8.8% |
| 53 | Delaney Capital Management Ltd.#53 · 160,392 sh | 160,392 | $4.6M | 0.73% | +4.1% |
| 54 | NewGen Asset Management Ltd#54 · 150,000 sh | 150,000 | $4.3M | 1.78% | New |
| 55 | CIBC Asset Management#55 · 138,246 sh | 138,246 | $4.0M | <0.01% | +3.0% |
| 56 | Front Street Capital Management#56 · 124,973 sh | 124,973 | $3.6M | 0.41% | -52.1% |
| 57 | HARBOR CAPITAL ADVISORS#57 · 115,198 sh | 115,198 | $3.3M | — | +11.7% |
| 58 | LOUISBOURG INVESTMENTS#58 · 111,104 sh | 111,104 | $3.2M | — | +30.9% |
| 59 | Polar Asset Management Partners#59 · 105,203 sh | 105,203 | $3.0M | 0.05% | New |
| 60 | BRITISH COLUMBIA INVESTMENT MANAGEMENT#60 · 101,546 sh | 101,546 | $2.9M | 0.02% | +44.2% |
| 61 | K.J. Harrison & Partners#61 · 100,000 sh | 100,000 | $2.9M | 0.41% | New |
| 62 | MONTRUSCO BOLTON INVESTMENTS#62 · 99,056 sh | 99,056 | $2.9M | — | -42.1% |
| 63 | SEI INVESTMENTS#63 · 97,376 sh | 97,376 | $2.8M | <0.01% | -42.0% |
| 64 | PCJ Investment Counsel Ltd.#64 · 85,640 sh | 85,640 | $2.5M | 0.71% | +71.3% |
| 65 | Canoe Financial#65 · 83,024 sh | 83,024 | $2.4M | — | -5.0% |
| 66 | HALLSTATT ADVISORS L.P.#66 · 83,020 sh | 83,020 | $2.4M | 1.68% | New |
| 67 | LAZARD ASSET MANAGEMENT#67 · 83,052 sh | 83,052 | $2.4M | <0.01% | +18.8% |
| 68 | CITADEL ADVISORS#68 · 82,308 sh | 82,308 | $2.4M | <0.01% | +1.3% |
| 69 | MANUFACTURERS LIFE INSURANCE COMPANY, THE#69 · 73,654 sh | 73,654 | $2.1M | <0.01% | -0.6% |
| 70 | GEODE CAPITAL MANAGEMENT#70 · 69,598 sh | 69,598 | $2.0M | <0.01% | +1.2% |
| 71 | VANGUARD ASSET MANAGEMENT, Ltd#71 · 66,830 sh | 66,830 | $1.9M | <0.01% | 0.0% |
| 72 | CenterBook Partners#72 · 65,180 sh | 65,180 | $1.9M | 0.09% | New |
| 73 | Nuveen#73 · 62,584 sh | 62,584 | $1.8M | <0.01% | 0.0% |
| 74 | Caldwell Investment Management Ltd.#74 · 60,800 sh | 60,800 | $1.7M | 1.15% | 0.0% |
| 75 | BOOTHBAY FUND MANAGEMENT#75 · 59,867 sh | 59,867 | $1.7M | 0.02% | New |
| 76 | Zurcher Kantonalbank (Zurich Cantonalbank)#76 · 54,361 sh | 54,361 | $1.6M | <0.01% | +72.8% |
| 77 | Federation des caisses Desjardins du Quebec#77 · 54,947 sh | 54,947 | $1.6M | <0.01% | -51.4% |
| 78 | VAN ECK ASSOCIATES#78 · 46,507 sh | 46,507 | $1.3M | <0.01% | +91.6% |
| 79 | GUARDIAN CAPITAL#79 · 46,433 sh | 46,433 | $1.3M | 0.03% | -1.1% |
| 80 | INTACT INVESTMENT MANAGEMENT#80 · 40,489 sh | 40,489 | $1.2M | 0.03% | -24.2% |
| 81 | Aviso Financial#81 · 40,111 sh | 40,111 | $1.2M | 0.04% | -12.3% |
| 82 | PenderFund Capital Management Ltd.#82 · 37,700 sh | 37,700 | $1.1M | 0.14% | +88.5% |
| 83 | CITIGROUP#83 · 36,651 sh | 36,651 | $1.1M | <0.01% | +36.7% |
| 84 | BANK OF NOVA SCOTIA#84 · 35,291 sh | 35,291 | $1.0M | 0.08% | +2.8% |
| 85 | XTX Topco Ltd#85 · 35,013 sh | 35,013 | $1.0M | 0.01% | New |
| 86 | SUSQUEHANNA INTERNATIONAL GROUP, LLP#86 · 34,791 sh | 34,791 | $1.0M | <0.01% | New |
| 87 | AMERICAN CENTURY COMPANIES#87 · 32,500 sh | 32,500 | $936.8K | <0.01% | New |
| 88 | Engineers Gate Manager#88 · 31,363 sh | 31,363 | $902.6K | 0.01% | +140.3% |
| 89 | Verition Fund Management#89 · 29,513 sh | 29,513 | $849.4K | <0.01% | New |
| 90 | PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO#90 · 28,366 sh | 28,366 | $817.3K | <0.01% | +3.8% |
| 91 | FRANKLIN RESOURCES#91 · 25,412 sh | 25,412 | $731.7K | <0.01% | -89.7% |
| 92 | Squarepoint Ops#92 · 24,760 sh | 24,760 | $712.6K | <0.01% | New |
| 93 | SIG North Trading, ULC#93 · 22,575 sh | 22,575 | $649.7K | 0.01% | -14.1% |
| 94 | ExodusPoint Capital Management#94 · 22,100 sh | 22,100 | $636.0K | <0.01% | +0.2% |
| 95 | Vanguard Investments Australia, Ltd.#95 · 21,874 sh | 21,874 | $630.5K | <0.01% | +13.2% |
| 96 | WELLS FARGO & COMPANY#96 · 19,748 sh | 19,748 | $568.3K | <0.01% | +1210.4% |
| 97 | BARCLAYS PLC#97 · 16,814 sh | 16,814 | $483.9K | <0.01% | +464.6% |
| 98 | ALLIANCEBERNSTEIN L.P.#98 · 16,380 sh | 16,380 | $461.9K | <0.01% | +82.8% |
| 99 | Pictet Asset Management Holding SA#99 · 15,987 sh | 15,987 | $460.7K | <0.01% | -2.7% |
| 100 | Purpose Unlimited#100 · 15,754 sh | 15,754 | $454.1K | 0.02% | -44.9% |
Funds that sold out of ATS in Q2 2026 (13)
Held ATS at the end of Q1 2026 and filed a Q2 2026 13F without it. Not in the list above, because they no longer hold it. Largest prior position first.
| Institution | Shares sold | Value in Q1 2026 |
|---|---|---|
| Vinva Investment Management Ltd2,088,947 sh | 2,088,947 | $36.5M |
| PRINCIPAL FINANCIAL GROUP620,840 sh | 620,840 | $17.4M |
| ROYCE & ASSOCIATES179,500 sh | 179,500 | $5.1M |
| D. E. Shaw30,200 sh | 30,200 | $851.0K |
| Numerai GP27,538 sh | 27,538 | $776.6K |
| BALYASNY ASSET MANAGEMENT L.P.14,124 sh | 14,124 | $398.3K |
| MARSHALL WACE, LLP9,920 sh | 9,920 | $279.7K |
| Brevan Howard Capital Management8,424 sh | 8,424 | $237.6K |
| Orion Porfolio Solutions7,994 sh | 7,994 | $225.4K |
| Western Wealth Management236 sh | 236 | $6.7K |
| WELLINGTON-ALTUS USA125 sh | 125 | $3.6K |
| Root Financial Partners40 sh | 40 | $1.1K |
| JONES FINANCIAL COMPANIES LLLP36 sh | 36 | $1.0K |
Source: Form 13F-HR filings on SEC EDGAR, Q2 2026. Values are as reported by each manager at quarter end. “% of portfolio” is the position’s share of the manager’s total reported 13F value for the same quarter. “New” means the manager filed a 13F for Q1 2026 without this position; a dash means no comparison is available. Where a manager’s own filing is internally inconsistent its value is withheld and it is listed last. 13F data shows reported holdings, not recommendations.