AtsATS
13F holders, Q4 2025 (December 31)122holders +7
20new positions
13sold out
4famous investors
$27.65avg. 13F price*
At the end of Q4 2025, 122 institutions reported holding Ats Corp. (ATS) in their 13F filings, up 7 from Q3 2025. 20 opened new positions and 13 sold out. The largest holders were Mason Capital Management LLC ($428.6M), Royal Bank of Canada ($210.5M) and EdgePoint Investment Group Inc. ($189.8M). 4 famous investors held it, including Prem Watsa (3.3% of Fairfax Financial Holdings's portfolio), Ken Griffin (0.0% of Citadel Advisors's portfolio) and David E. Shaw (0.0% of D. E. Shaw & Co.'s portfolio).
- Company
- Ats Corp.
- CUSIP
- 00217Y104
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q3 2025 → Q4 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 20 | $18.1M |
| Exits | 13 | $21.3M |
All 13F filers, Q3 2025 → Q4 2025: 5,464,384 shares bought and 4,508,962 shares sold, net +955,422 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 122 holders
| Mason Capital Management LLC | 76.32% | No change | 15,563,568 | $428.6M |
| Royal Bank of Canada | 0.04% | Add +6.2% | 7,644,547 | $210.5M |
| EdgePoint Investment Group Inc. | 1.56% | Add +8.0% | 6,888,785 | $189.8M |
| Beutel, Goodman & Co Ltd. | 0.99% | Reduce -7.8% | 5,837,138 | $161.0M |
| Turtle Creek Asset Management Inc. | 6.84% | Reduce -19.1% | 5,642,052 | $155.4M |
| Vanguard Group Inc. | 0.00% | Add +1.7% | 3,397,166 | $93.6M |
| Bank of Montreal | 0.03% | Add +164.5% | 3,022,693 | $83.3M |
| Connor, Clark & Lunn Investment Management Ltd. | 0.18% | Add +21.1% | 2,485,638 | $68.5M |
| Fairfax Financial Holdings | 3.28% | No change | 2,486,400 | $68.3M |
| FMR LLC | 0.00% | Add +54.0% | 2,117,766 | $58.3M |
| ACK Asset Management LLC | 6.38% | No change | 1,846,196 | $50.8M |
| Hill City Capital, LP | 1.72% | No change | 1,649,857 | $45.4M |
| Alberta Investment Management Corp | 0.25% | No change | 1,340,265 | $36.9M |
| Invesco Ltd. | 0.00% | Add +6.3% | 1,272,222 | $35.0M |
| Scheer, Rowlett & Associates Investment Management Ltd. | 2.32% | Add +0.8% | 1,226,450 | $33.8M |
| TD Asset Management Inc | 0.03% | Add +1.0% | 1,193,208 | $32.9M |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.05% | Add +2.9% | 1,141,835 | $31.5M |
| Van Lanschot Kempen Investment Management N.V. | 0.26% | Reduce -0.1% | 815,031 | $30.8M |
| Clearbridge Investments, LLC | 0.02% | Reduce -1.7% | 1,111,485 | $30.6M |
| Bank of America Corp. | 0.00% | Reduce -12.1% | 1,100,381 | $30.3M |
| Marathon Asset Management Ltd | 1.16% | Reduce -5.9% | 1,097,711 | $30.3M |
| Norges Bank | 0.00% | — | 1,079,090 | $29.7M |
| TD Waterhouse Canada Inc. | 0.16% | Reduce -32.4% | 966,349 | $26.5M |
| Principal Financial Group Inc. | 0.01% | Add +0.5% | 878,240 | $24.2M |
| Janus Henderson Group PLC | 0.01% | Reduce -4.1% | 861,839 | $23.8M |
| 1832 Asset Management L.P. | 0.03% | Add +10.8% | 818,559 | $22.5M |
| Mackenzie Financial Corp. | 0.02% | Reduce -33.3% | 758,980 | $21.1M |
| Healthcare of Ontario Pension Plan Trust Fund | 0.04% | No change | 753,492 | $20.8M |
| Massachusetts Financial Services Co. | 0.01% | Reduce -1.9% | 558,675 | $15.4M |
| Legal & General Group Plc | 0.00% | Add +9.6% | 542,023 | $14.9M |
| National Bank of Canada | 0.01% | Reduce -0.4% | 418,332 | $11.5M |
| Agf Management Ltd. | 0.05% | Reduce -18.3% | 400,140 | $11.0M |
| Cibc World Market Inc. | 0.02% | Reduce -4.2% | 354,069 | $9.8M |
| Public Sector Pension Investment Board | 0.03% | Add +364.9% | 287,829 | $7.9M |
| Front Street Capital Management, Inc. | 1.12% | Reduce -1.0% | 286,994 | $7.9M |
| Goldman Sachs Group Inc. | 0.00% | Reduce -43.8% | 285,377 | $7.9M |
| Van Berkom & Associates Inc. | 0.21% | Reduce -0.3% | 269,136 | $7.4M |
| Montrusco Bolton Investments Inc. | 0.09% | Reduce -10.3% | 254,681 | $7.0M |
| Charles Schwab Investment Management Inc. | 0.00% | Add +2.5% | 236,332 | $6.5M |
| UBS Group AG | 0.00% | Reduce -1.2% | 228,774 | $6.3M |
| Dixon Mitchell Investment Counsel Inc. | 0.19% | Reduce -3.4% | 211,025 | $5.8M |
| Louisbourg Investments Inc. | 1.14% | Reduce -3.8% | 207,130 | $5.7M |
| Granite Investment Partners, LLC | 0.33% | Reduce -1.0% | 203,876 | $5.6M |
| Scotia Capital Inc. | 0.02% | Reduce -6.7% | 195,019 | $5.3M |
| First Trust Advisors LP | 0.00% | Add +23.8% | 184,128 | $5.1M |
| Focus Partners Wealth | 0.01% | Reduce -0.0% | 181,975 | $5.0M |
| Polar Asset Management Partners Inc. | 0.13% | New | 180,000 | $5.0M |
| Swiss National Bank | 0.00% | Add +2.7% | 164,400 | $4.5M |
| Royce & Associates LP | 0.05% | Add +22.3% | 164,500 | $4.5M |
| Delaney Capital Management Ltd. | 0.70% | — | 153,037 | $4.2M |
| Citadel Advisors | 0.00% | Add +113.2% | 148,840 | $4.1M |
| CIBC Asset Management Inc | 0.01% | Reduce -2.5% | 131,500 | $3.6M |
| Federation des caisses Desjardins du Quebec | 0.01% | Reduce -40.4% | 116,404 | $3.2M |
| Dimensional Fund Advisors LP | 0.00% | Add +23.7% | 110,342 | $3.0M |
| D. E. Shaw & Co. | 0.00% | Reduce -50.4% | 108,100 | $3.0M |
| Sei Investments Co. | 0.00% | New | 98,742 | $2.7M |
| Toronto Dominion Bank | 0.00% | Add +5.1% | 81,910 | $2.3M |
| Canoe Financial LP | 0.03% | Add +2.2% | 80,600 | $2.2M |
| Manufacturers Life Insurance Company, The | 0.00% | Reduce -0.0% | 76,426 | $2.1M |
| Millennium Management | 0.00% | Add +73.2% | 75,879 | $2.1M |
| AYAL Capital Advisors Ltd | 1.09% | New | 72,200 | $2.0M |
| Fiera Capital Corp | 0.01% | Reduce -23.8% | 71,007 | $2.0M |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 0.00% | Reduce -29.4% | 64,639 | $1.8M |
| Nuveen, LLC | 0.00% | No change | 62,584 | $1.7M |
| Caldwell Investment Management Ltd. | 1.04% | No change | 60,800 | $1.7M |
| Geode Capital Management, LLC | 0.00% | Add +18.0% | 59,255 | $1.7M |
| Lazard Asset Management LLC | 0.00% | New | 58,426 | $1.6M |
| FIL Ltd | 0.00% | New | 53,569 | $1.5M |
| Aviso Financial Inc. | 0.05% | Reduce -1.0% | 51,725 | $1.4M |
| Guardian Capital LP | 0.04% | New | 47,063 | $1.3M |
| BRITISH COLUMBIA INVESTMENT MANAGEMENT Corp | 0.01% | Reduce -8.5% | 43,753 | $1.2M |
| Bank of Nova Scotia Trust Co. | 0.07% | Add +21.7% | 30,514 | $840K |
| Main Management ETF Advisors, LLC | 0.03% | Add +1.0% | 29,754 | $819K |
| SIG North Trading, ULC | 0.14% | New | 29,342 | $808K |
| Purpose Unlimited Inc. | 0.04% | — | 28,802 | $793K |
| Public Employees Retirement System of Ohio | 0.00% | Add +0.0% | 27,215 | $751K |
| Franklin Resources Inc. | 0.00% | Add +60.4% | 25,386 | $699K |
| Citigroup Inc. | 0.00% | Add +53.0% | 25,149 | $694K |
| Candelo Capital Management LP | 0.62% | New | 24,700 | $680K |
| Jane Street Group, LLC | 0.00% | New | 22,063 | $608K |
| Morgan Stanley | 0.00% | Reduce -69.1% | 21,491 | $592K |
| Aberdeen Group plc | 0.00% | Add +7.6% | 20,007 | $551K |
| PenderFund Capital Management Ltd. | 0.21% | No change | 20,000 | $551K |
| Numerai GP LLC | 0.05% | New | 16,305 | $449K |
| Pictet Asset Management Holding SA | 0.00% | Add +3.0% | 16,006 | $442K |
| Van Eck Associates Corp. | 0.00% | Add +125.7% | 13,571 | $374K |
| Stifel Financial Corp. | 0.00% | Add +3.9% | 12,593 | $347K |
| Third View Private Wealth, LLC | 0.05% | — | 12,264 | $338K |
| Mariner, LLC | 0.00% | Add +34.8% | 12,167 | $335K |
| TRUE Private Wealth Advisors | 0.03% | No change | 12,080 | $333K |
| Savant Capital, LLC | 0.00% | New | 11,372 | $313K |
| SkyView Investment Advisors, LLC | 0.04% | New | 10,966 | $302K |
| XTX Topco Ltd | 0.01% | Reduce -21.9% | 10,640 | $293K |
| Northwest & Ethical Investments L.P. | 0.01% | Add +22.5% | 10,553 | $291K |
| Deutsche Bank AG | 0.00% | Reduce -5.8% | 10,261 | $283K |
| Investment Management Corp of Ontario | 0.00% | New | 10,116 | $279K |
| Rockefeller Capital Management L.P. | 0.00% | Reduce -65.9% | 9,790 | $270K |
| Verition Fund Management LLC | 0.00% | New | 9,192 | $253K |
| Alliancebernstein L.P. | 0.00% | Reduce -8.8% | 8,960 | $247K |
| Campbell & CO Investment Adviser LLC | 0.01% | New | 8,805 | $242K |
| Russell Investments Group, Ltd. | 0.00% | Reduce -74.2% | 8,529 | $235K |
| Envestnet Asset Management Inc. | 0.00% | Reduce -57.1% | 7,634 | $210K |
| Barclays PLC | 0.00% | Add +16.8% | 5,264 | $145K |
| Smartleaf Asset Management LLC | 0.00% | New | 1,052 | $29K |
| Blue Trust, Inc. | 0.00% | New | 733 | $20K |
| Wells Fargo & Company | 0.00% | Add +12.5% | 711 | $20K |
| Hillsdale Investment Management Inc. | 0.00% | New | 600 | $17K |
| JPMorgan Chase & Co. | 0.00% | Reduce -22.6% | 553 | $15K |
| Farther Finance Advisors, LLC | 0.00% | Add +8.2% | 263 | $7K |
| Banque Cantonale Vaudoise | 0.00% | Reduce -27.5% | 261 | $7K |
| Hantz Financial Services, Inc. | 0.00% | No change | 173 | $5K |
| 2UniFi Bank | 0.00% | New | 137 | $4K |
| Pacer Advisors, Inc. | 0.00% | Add +38.4% | 137 | $4K |
| Larson Financial Group LLC | 0.00% | Add +830.8% | 121 | $3K |
| WealthCollab, LLC | 0.00% | No change | 89 | $2K |
| EverSource Wealth Advisors, LLC | 0.00% | Add +245.0% | 69 | $2K |
| BlackRock, Inc. | 0.00% | New | 58 | $2K |
| Root Financial Partners, LLC | 0.00% | No change | 40 | $1K |
| Jones Financial Companies LLLP | 0.00% | Reduce -26.5% | 36 | $991 |
| Osaic Holdings, Inc. | 0.00% | Reduce -95.2% | 30 | $826 |
| Bell Investment Advisors, Inc | 0.00% | No change | 20 | $551 |
| Leonteq Securities AG | 0.00% | No change | 4 | $151 |
"% of holder's portfolio" is ATS's weight in each manager's 13F, not the share of Ats Corp. the manager owns.