# ATS CORPORATION COM

ATS CORPORATION COM is a security (CUSIP 00217Y104) tracked across SEC portfolio filings. 129 institutional managers reported $2.3B on Form 13F as of 2026-06-30; 7 registered fund positions totaling $46.3M via N-PORT as of 2026-05-31.

## Summary

- Issuer: ATS CORPORATION
- Class: COM
- CUSIP: 00217Y104
- Asset category: EC
- 13F holders: 129
- 13F value: $2.3B
- 13F period: 2026-06-30
- N-PORT fund positions: 7
- N-PORT value: $46.3M
- N-PORT report: 2026-05-31

## Top institutional holders (Form 13F)

_Showing 15 of 129 managers by value._

| Manager | Location | Value | Shares |
| --- | --- | --- | --- |
| MASON CAPITAL MANAGEMENT LLC | New York, NY | $462.6M | 16,404,170 |
| Royal Bank of Canada | TORONTO, A6 | $218.9M | 7,761,838 |
| EdgePoint Investment Group Inc. | TORONTO, A6 | $202.1M | 7,168,112 |
| TURTLE CREEK ASSET MANAGEMENT INC. | TORONTO, A6 | $138.1M | 4,896,669 |
| [VANGUARD GROUP INC](https://search.stillhousedata.com/firm/105958) | Valley Forge, PA | $93.6M | 3,397,166 |
| BANK OF MONTREAL /CAN/ | TORONTO, A6 | $87.8M | 3,115,360 |
| FAIRFAX FINANCIAL HOLDINGS LTD/ CAN | Toronto, A6 | $69.4M | 2,486,400 |
| JANUS HENDERSON GROUP PLC | LONDON, X0 | $64.5M | 2,297,214 |
| FMR LLC | BOSTON, MA | $64.2M | 2,277,472 |
| [Connor, Clark & Lunn Investment Management Ltd.](https://search.stillhousedata.com/firm/107557) | VANCOUVER, A1 | $63.8M | 2,264,757 |
| [ACK Asset Management LLC](https://search.stillhousedata.com/firm/155136) | GREENWICH, CT | $52.1M | 1,846,196 |
| FIL Ltd | HAMILTON, D0 | $50.1M | 1,778,181 |
| [Burgundy Asset Management Ltd.](https://search.stillhousedata.com/firm/114317) | Toronto, A6 | $50.0M | 1,807,557 |
| TD Waterhouse Canada Inc. | TORONTO, A6 | $47.4M | 1,683,683 |
| [Hill City Capital, LP](https://search.stillhousedata.com/firm/306709) | BOSTON, MA | $46.5M | 1,649,857 |

## Top fund holders (N-PORT)

| Fund | Registrant | Value | % of fund |
| --- | --- | --- | --- |
| [Janus Henderson Venture Fund](https://search.stillhousedata.com/fund/S000010488) | JANUS INVESTMENT FUND | $22.8M | 74.47% |
| [Meridian Contrarian Fund](https://search.stillhousedata.com/fund/S000001463) | Meridian Fund Inc | $9.8M | 166.75% |
| [abrdn U.S. Small Cap Equity Fund](https://search.stillhousedata.com/fund/S000020297) | abrdn Funds | $7.6M | 202.77% |
| [Embark Small Cap Equity Fund](https://search.stillhousedata.com/fund/S000083503) | Harbor Funds II | $3.4M | 59.66% |
| ROYCE SMALL-CAP TRUST, INC. | ROYCE SMALL-CAP TRUST, INC. | $1.8M | 8.02% |
| [Tarkio Fund](https://search.stillhousedata.com/fund/S000031478) | Clark Fork Trust | $907K | 35.00% |
| [Blackstone Alternative Multi-Strategy Fund](https://search.stillhousedata.com/fund/S000045538) | Blackstone Alternative Investment Funds | $-79K | -0.22% |

## More

- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/security/00217Y104.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

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Source: public SEC filing data via Adviser Search (https://search.stillhousedata.com).
Agents: this data is also queryable via MCP tools and read-only SQL — see https://search.stillhousedata.com/llms.txt.