AtsATS
13F holders, Q1 2026 (March 31)131holders +9
19new positions
13sold out
4famous investors
$28.09avg. 13F price*
At the end of Q1 2026, 131 institutions reported holding Ats Corp. (ATS) in their 13F filings, up 9 from Q4 2025. 19 opened new positions and 13 sold out. The largest holders were Mason Capital Management LLC ($462.6M), Royal Bank of Canada ($218.9M) and EdgePoint Investment Group Inc. ($202.1M). 4 famous investors held it, including Prem Watsa (3.6% 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 Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 19 | $56.3M |
| Exits | 13 | $45.0M |
All 13F filers, Q4 2025 → Q1 2026: 9,458,496 shares bought and 6,509,316 shares sold, net +2,949,180 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 131 holders
| Mason Capital Management LLC | 75.48% | Add +5.4% | 16,404,170 | $462.6M |
| Royal Bank of Canada | 0.04% | Add +1.5% | 7,761,838 | $218.9M |
| EdgePoint Investment Group Inc. | 1.62% | Add +4.0% | 7,168,112 | $202.1M |
| Beutel, Goodman & Co Ltd. | 1.04% | Reduce -6.5% | 5,454,749 | $153.3M |
| Turtle Creek Asset Management Inc. | 5.17% | Reduce -13.2% | 4,896,669 | $138.1M |
| Bank of Montreal | 0.04% | Add +3.1% | 3,115,360 | $87.8M |
| Fairfax Financial Holdings | 3.57% | No change | 2,486,400 | $69.4M |
| Vanguard Capital Management LLC | 0.00% | — | 2,366,730 | $66.7M |
| Janus Henderson Group PLC | 0.03% | Add +166.6% | 2,297,214 | $64.5M |
| FMR LLC | 0.00% | Add +7.5% | 2,277,472 | $64.2M |
| Connor, Clark & Lunn Investment Management Ltd. | 0.15% | Reduce -8.9% | 2,264,757 | $63.8M |
| ACK Asset Management LLC | 6.50% | No change | 1,846,196 | $52.1M |
| FIL Ltd | 0.04% | Add +3219.4% | 1,778,181 | $50.1M |
| TD Waterhouse Canada Inc. | 0.14% | Add +69.1% | 1,634,449 | $46.9M |
| Hill City Capital, LP | 1.66% | No change | 1,649,857 | $46.5M |
| TD Asset Management Inc | 0.03% | Add +19.2% | 1,422,459 | $40.0M |
| Vinva Investment Management Ltd | 0.45% | New | 2,088,947 | $36.5M |
| Van Lanschot Kempen Investment Management N.V. | 0.30% | Add +6.0% | 863,486 | $33.9M |
| Scheer, Rowlett & Associates Investment Management Ltd. | 2.40% | Reduce -3.6% | 1,181,937 | $33.3M |
| Clearbridge Investments, LLC | 0.03% | Reduce -1.8% | 1,091,291 | $30.8M |
| Marathon Asset Management Ltd | 1.18% | Reduce -0.3% | 1,093,911 | $30.7M |
| Bank of America Corp. | 0.00% | Reduce -14.0% | 945,875 | $26.7M |
| Alberta Investment Management Corp | 0.18% | Reduce -29.9% | 940,191 | $26.5M |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.03% | Reduce -33.6% | 758,313 | $21.3M |
| Massachusetts Financial Services Co. | 0.01% | Reduce -4.4% | 533,957 | $20.9M |
| Vanguard Fiduciary Trust Co. | 0.01% | — | 728,058 | $20.5M |
| National Bank of Canada | 0.02% | Add +55.0% | 648,282 | $18.1M |
| Principal Financial Group Inc. | 0.01% | Reduce -29.3% | 620,840 | $17.4M |
| Mackenzie Financial Corp. | 0.02% | Reduce -18.8% | 616,504 | $17.4M |
| Legal & General Group Plc | 0.00% | Add +12.8% | 611,689 | $17.2M |
| 1832 Asset Management L.P. | 0.01% | Reduce -50.9% | 401,696 | $11.3M |
| Public Sector Pension Investment Board | 0.03% | Add +24.0% | 356,837 | $10.1M |
| Cibc World Market Inc. | 0.02% | Reduce -2.1% | 346,606 | $9.8M |
| Invesco Ltd. | 0.00% | Reduce -73.0% | 343,176 | $9.7M |
| Front Street Capital Management, Inc. | 0.98% | Reduce -9.0% | 261,088 | $7.4M |
| Vanguard Global Advisers, LLC | 0.00% | — | 258,998 | $7.3M |
| Van Berkom & Associates Inc. | 0.24% | Reduce -4.4% | 257,360 | $7.2M |
| Franklin Resources Inc. | 0.00% | Add +874.8% | 247,467 | $7.0M |
| Charles Schwab Investment Management Inc. | 0.00% | Add +1.0% | 238,654 | $6.7M |
| UBS Group AG | 0.00% | Reduce -0.5% | 227,628 | $6.4M |
| Waratah Capital Advisors Ltd. | 0.57% | New | 223,983 | $6.3M |
| Dixon Mitchell Investment Counsel Inc. | 0.21% | No change | 211,025 | $5.9M |
| Scotia Capital Inc. | 0.02% | Reduce -1.3% | 192,530 | $5.4M |
| Focus Partners Wealth | 0.01% | No change | 181,975 | $5.1M |
| Royce & Associates LP | 0.05% | Add +9.1% | 179,500 | $5.1M |
| ArrowMark Colorado Holdings LLC | 0.13% | New | 174,000 | $4.9M |
| Granite Investment Partners, LLC | 0.30% | Reduce -15.1% | 173,031 | $4.9M |
| Montrusco Bolton Investments Inc. | 0.07% | Reduce -32.9% | 170,956 | $4.8M |
| Sei Investments Co. | 0.00% | Add +70.0% | 167,820 | $4.7M |
| Swiss National Bank | 0.00% | No change | 164,400 | $4.6M |
| First Trust Advisors LP | 0.00% | Reduce -16.1% | 154,403 | $4.4M |
| Delaney Capital Management Ltd. | 0.70% | Add +0.7% | 154,077 | $4.3M |
| Candelo Capital Management LP | 4.30% | Add +514.1% | 151,688 | $4.3M |
| CIBC Asset Management Inc | 0.01% | Add +2.0% | 134,186 | $3.8M |
| Dimensional Fund Advisors LP | 0.00% | Add +11.0% | 122,456 | $3.5M |
| Federation des caisses Desjardins du Quebec | 0.01% | Reduce -2.9% | 113,047 | $3.2M |
| Harbor Capital Advisors, Inc. | 0.24% | New | 103,168 | $2.9M |
| Morgan Stanley | 0.00% | Add +367.1% | 100,390 | $2.8M |
| Toronto Dominion Bank | 0.01% | Add +13.8% | 93,175 | $2.6M |
| Canoe Financial LP | 0.03% | Add +8.5% | 87,430 | $2.5M |
| Louisbourg Investments Inc. | 0.45% | Reduce -59.0% | 84,855 | $2.4M |
| Jane Street Group, LLC | 0.00% | Add +274.6% | 82,641 | $2.3M |
| Citadel Advisors | 0.00% | Reduce -45.4% | 81,239 | $2.3M |
| Manufacturers Life Insurance Company, The | 0.00% | Reduce -3.0% | 74,130 | $2.1M |
| BRITISH COLUMBIA INVESTMENT MANAGEMENT Corp | 0.01% | Add +61.0% | 70,422 | $2.0M |
| Geode Capital Management, LLC | 0.00% | Add +16.1% | 68,798 | $2.0M |
| Lazard Asset Management LLC | 0.00% | Add +19.7% | 69,912 | $2.0M |
| VANGUARD ASSET MANAGEMENT, Ltd | 0.00% | — | 66,830 | $1.9M |
| Nuveen, LLC | 0.00% | No change | 62,584 | $1.8M |
| Caldwell Investment Management Ltd. | 0.65% | No change | 60,800 | $1.6M |
| Intact Investment Management Inc. | 0.04% | New | 53,389 | $1.5M |
| Goldman Sachs Group Inc. | 0.00% | Reduce -81.7% | 52,251 | $1.5M |
| PCJ Investment Counsel Ltd. | 0.40% | New | 50,000 | $1.4M |
| Guardian Capital LP | 0.03% | Reduce -0.2% | 46,955 | $1.3M |
| Aviso Financial Inc. | 0.05% | Reduce -11.5% | 45,760 | $1.3M |
| Bank of Nova Scotia Trust Co. | 0.08% | Add +12.5% | 34,332 | $968K |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 0.00% | Reduce -51.4% | 31,450 | $884K |
| D. E. Shaw & Co. | 0.00% | Reduce -72.1% | 30,200 | $851K |
| Purpose Unlimited Inc. | 0.03% | Reduce -0.8% | 28,567 | $805K |
| Numerai GP LLC | 0.08% | Add +68.9% | 27,538 | $777K |
| Public Employees Retirement System of Ohio | 0.00% | Add +0.4% | 27,335 | $768K |
| Citigroup Inc. | 0.00% | Add +6.6% | 26,816 | $753K |
| SIG North Trading, ULC | 0.15% | Reduce -10.4% | 26,275 | $741K |
| Aberdeen Group plc | 0.00% | Add +31.1% | 26,237 | $740K |
| Van Eck Associates Corp. | 0.00% | Add +78.8% | 24,271 | $684K |
| ExodusPoint Capital Management, LP | 0.01% | New | 22,050 | $622K |
| PenderFund Capital Management Ltd. | 0.26% | No change | 20,000 | $564K |
| Vanguard Investments Australia, Ltd. | 0.00% | — | 19,315 | $544K |
| Pictet Asset Management Holding SA | 0.00% | Add +2.6% | 16,423 | $461K |
| Mariner, LLC | 0.00% | Add +33.5% | 16,237 | $458K |
| Balyasny Asset Management L.P. | 0.00% | New | 14,124 | $398K |
| Engineers Gate Manager LP | 0.00% | New | 13,052 | $368K |
| Savant Capital, LLC | 0.00% | Add +11.3% | 12,657 | $357K |
| TRUE Private Wealth Advisors | 0.03% | No change | 12,080 | $341K |
| Stifel Financial Corp. | 0.00% | Reduce -5.6% | 11,891 | $335K |
| Investment Management Corp of Ontario | 0.00% | Add +15.8% | 11,716 | $330K |
| Northwest & Ethical Investments L.P. | 0.01% | Add +4.1% | 10,983 | $309K |
| SkyView Investment Advisors, LLC | 0.04% | No change | 10,966 | $309K |
| Deutsche Bank AG | 0.00% | Add +4.8% | 10,752 | $303K |
| Marshall Wace, LLP | 0.00% | New | 9,920 | $280K |
"% of holder's portfolio" is ATS's weight in each manager's 13F, not the share of Ats Corp. the manager owns.