# Automotive manufacturers and suppliers headquartered in Ontario

Tamtam tracks 93 automotive manufacturers and suppliers headquartered in Ontario. This list ranks the 50 largest by number of employees on LinkedIn, led by Magna International, Toronto Transit Commission (TTC) and Linamar Corporation. Their median headcount is 572. Half of them were founded in 1978 or later. The most common headquarters are Toronto (6), Mississauga (5) and Markham (3).

This selection of large companies in Ontario primarily features automotive manufacturers and suppliers. Key players include Magna International, a developer of vehicle technologies and systems; Linamar Corporation, an advanced manufacturing company specializing in vehicle solutions; and Martinrea International, a global automotive supplier focusing on metal forming and fluid systems. Other notable firms are ABC Technologies, a leader in plastics and injection molding for the automotive industry, and Toyota Motor Manufacturing Canada, a large-scale vehicle assembly operation.

A significant pattern among these companies is their strong concentration in the automotive sector, encompassing both vehicle production and the supply of specialized components and technologies. While most are directly involved in motor vehicle manufacturing, related industries such as automation machinery manufacturing, urban transit services, financial services for fleets, and even software development (BlackBerry) also appear, often serving the broader mobility ecosystem.

🇨🇦 Ontario · 50 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Magna International](https://www.tamtam.ai/c/magna-international) (magna.com)<br>Developing technologies and systems to make vehicles safer and cleaner, focusing on community, environmental, and human benefits. | Motor Vehicle Manufacturing | 🇨🇦 Aurora | 158,000 | 1957 |
| 2 | [Toronto Transit Commission (TTC)](https://www.tamtam.ai/c/toronto-transit-commission-ttc) (ttc.ca)<br>A leading transit system in Toronto, providing safe and reliable transportation to over 17 million customers daily through various modes | Urban Transit Services | 🇨🇦 Toronto | 8,829 | 1921 |
| 3 | [Linamar Corporation](https://www.tamtam.ai/c/linamar-corporation) (linktr.ee)<br>Advanced manufacturing company specializing in solutions for vehicles, motion, work, and lives Comprised of Industrial and Mobility segments, with global reach and innovative products | Motor Vehicle Manufacturing | 🇨🇦 Guelph | 6,668 | 1966 |
| 4 | [Martinrea International](https://www.tamtam.ai/c/martinrea-international) (martinrea.com)<br>Global automotive supplier focused on metal forming, aluminum casting, fluid systems, and assemblies to meet lightweight requirements Employs 18,000 people worldwide | Motor Vehicle Manufacturing | 🇨🇦 Vaughan | 5,692 | 2001 |
| 5 | [ABC Technologies](https://www.tamtam.ai/c/abc-technologies) (abctechnologies.com)<br>A global leader in plastics and injection molding technology for the automotive industry, focusing on innovation, sustainability, and creating career opportunities | Motor Vehicle Manufacturing | 🇨🇦 Toronto | 4,059 | 1974 |
| 6 | [Toyota Motor Manufacturing Canada](https://www.tamtam.ai/c/toyota-motor-manufacturing-canada) (tmmc.ca)<br>Large-scale vehicle assembly operation in Ontario with multiple production lines, employing thousands and focusing on quality and community responsibility. | Motor Vehicle Manufacturing | 🇨🇦 Cambridge | 2,658 |  |
| 7 | [Multimatic](https://www.tamtam.ai/c/multimatic) (multimatic.com)<br>A global enterprise specializing in supplying automotive components, systems, and engineering services with manufacturing divisions and engineering facilities worldwide | Motor Vehicle Manufacturing | 🇨🇦 Markham | 2,598 | 1984 |
| 8 | [Element Fleet Management](https://www.tamtam.ai/c/element-fleet-management) (elementfleet.com)<br>Providing tailored fleet management solutions and expert support to reduce costs and simplify business operations across entire fleet lifecycles. | Financial Services | 🇨🇦 Toronto | 2,504 | 1946 |
| 9 | [Woodbridge](https://www.tamtam.ai/c/woodbridge) (woodbridgegroup.com)<br>Global provider of innovative solutions for automotive, commercial, recreational, packaging, healthcare, and building industries with headquarters in Canada and the USA | Motor Vehicle Manufacturing | 🇨🇦 Mississauga | 2,262 | 1978 |
| 10 | [BlackBerry](https://www.tamtam.ai/c/blackberry) (blackberry.com)<br>Provides intelligent software and services to enterprises and governments, enabling transformative applications, new revenue streams, and innovative business models with safety, security, and reliability. | Software Development | 🇨🇦 Waterloo | 2,005 |  |
| 11 | [Plasman](https://www.tamtam.ai/c/plasman) (plasman.com)<br>Global leader in automotive components, offering single-source solutions for tooling, injection molding, chroming, and assembly with a collaborative mindset and unrivaled dedication | Motor Vehicle Manufacturing | 🇨🇦 Oldcastle | 1,751 | 1978 |
| 12 | [Honda of Canada Mfg.](https://www.tamtam.ai/c/honda-of-canada-mfg) (ca.indeed.com)<br>Manufactures high-quality Honda vehicles in Canada for Canadian and US markets, with a focus on growth, innovation, and skilled associates | Motor Vehicle Manufacturing | 🇨🇦 Alliston | 1,700 | 1986 |
| 13 | [Honda Canada Inc.](https://www.tamtam.ai/c/honda-canada-inc) (hondacanada.ca)<br>A Canadian success story in manufacturing vehicles and power equipment, with a commitment to sourcing from Canadian suppliers and sustainable practices | Motor Vehicle Manufacturing | 🇨🇦 Markham | 1,540 | 1969 |
| 14 | [Toyota Canada Inc.](https://www.tamtam.ai/c/toyota-canada-inc) (toyota.ca)<br>Exclusive distributor of Toyota and Lexus vehicles in Canada, operating regional offices, parts centers, and manufacturing plants in Ontario. | Motor Vehicle Manufacturing | 🇨🇦 Toronto | 1,210 |  |
| 15 | [Valiant TMS](https://www.tamtam.ai/c/valiant-tms) (valianttms.com)<br>An Industry 40 system integrator specializing in digitalization, process development, design, and technology integration with global strategic teams | Automation Machinery Manufacturing | 🇨🇦 Windsor | 1,105 | 1959 |
| 16 | [Mercedes-Benz Canada](https://www.tamtam.ai/c/mercedes-benz-canada) (mercedes-benz.ca)<br>Distributor and marketer of luxury vehicles, including combustion, hybrid, and electric models, as well as vans, with headquarters in Mississauga, Ontario | Motor Vehicle Manufacturing | 🇨🇦 Mississauga | 1,014 |  |
| 17 | [The Woodbridge Group](https://www.tamtam.ai/c/the-woodbridge-group) (woodbridgegroup.com)<br>Innovative urethane and bead foam technologies for automotive and other industries worldwide, providing comfort, safety, acoustics, insulation, and structural solutions Offering diverse services | Motor Vehicle Manufacturing | 🇨🇦 Mississauga | 915 |  |
| 18 | [Ground Effects Ltd.](https://www.tamtam.ai/c/ground-effects-ltd) (gfxltd.com)<br>A manufacturer of OEM-level automotive accessories that started in Canada and now has nearly 40 locations worldwide | Motor Vehicle Manufacturing | 🇨🇦 Tecumseh | 862 | 1986 |
| 19 | [MacLean Engineering](https://www.tamtam.ai/c/maclean-engineering) (macleanengineering.com)<br>Specializing in underground mobile equipment for hard rock mining, offering a wide range of solutions worldwide, including electrification for diesel-free operations | Mining | 🇨🇦 Collingwood | 779 | 1973 |
| 20 | [Stackpole International](https://www.tamtam.ai/c/stackpole-international) (johnsonelectric.com)<br>Global solutions provider specializing in fluid power systems and powder metal technology, offering high-quality, high-performance components and systems for various applications worldwide | Motor Vehicle Manufacturing | 🇨🇦 Ancaster | 774 |  |
| 21 | [Litens Automotive Group](https://www.tamtam.ai/c/litens-automotive-group) (litens.com)<br>Innovative global automotive leader with patented powertrain solutions, committed to excellence, diverse and inclusive workplace fostering creativity and innovation | Motor Vehicle Manufacturing | 🇨🇦 Vaughan | 726 | 1979 |
| 22 | [NextStar Energy](https://www.tamtam.ai/c/nextstar-energy)<br>Canada's pioneering producer of electric vehicle batteries, partnering with Stellantis and LG Energy Solution for innovative manufacturing | Manufacturing | 🇨🇦 Windsor | 680 | 2023 |
| 23 | [Mitchell Plastics](https://www.tamtam.ai/c/mitchell-plastics) (mitchellplastics.com)<br>Leading tier one supplier of automotive interior mechanisms and decorative components, offering concept, design, development, testing, and validation services with in-house manufacturing capabilities for quality products | Motor Vehicle Manufacturing | 🇨🇦 Kitchener | 590 | 1997 |
| 24 | [Kia Canada](https://www.tamtam.ai/c/kia-canada) (kia.ca)<br>Innovative, dynamic, and award-winning products and services offered through a network of dealers across Canada, dedicated to inspiring consumers | Motor Vehicle Manufacturing | 🇨🇦 Mississauga | 581 | 1999 |
| 25 | [Vuteq Canada Inc](https://www.tamtam.ai/c/vuteq-canada-inc) (vuteq.ca)<br>An international corporation with operations in automotive manufacturing, glass manufacturing, food production, and more, committed to continuous improvement and community involvement | Motor Vehicle Manufacturing | 🇨🇦 Woodstock | 572 | 1988 |
| 26 | [Matcor-Matsu Group](https://www.tamtam.ai/c/matcor-matsu-group) (matcor-matsu.com)<br>Fully integrated supplier of engineering and manufacturing services for automotive OEMs, specializing in complex assemblies and stampings for various applications | Motor Vehicle Manufacturing | 🇨🇦 Brampton | 556 | 1991 |
| 27 | [Meridian Lightweight Technologies Inc.](https://www.tamtam.ai/c/meridian-lightweight-technologies-inc) (meridian-mag.com)<br>Innovative supplier of magnesium die casting components and assemblies for the transportation market, emphasizing design excellence and global client base expansion | Motor Vehicle Manufacturing | 🇨🇦 Strathroy | 555 | 1981 |
| 28 | [OC Transpo](https://www.tamtam.ai/c/oc-transpo) (octranspo.com)<br>Public transportation provider in Canada's national capital with a fleet of accessible buses and trains, focused on sustainability and expanding light rail system | Urban Transit Services | 🇨🇦 Ottawa | 553 | 1973 |
| 29 | [KSR International Inc.](https://www.tamtam.ai/c/ksr-international-inc) (ksrint.com)<br>Industry leader in designing, engineering, and manufacturing driver interface systems for Tier 1 OEMs with a rich history of reliable manufacturing | Motor Vehicle Manufacturing | 🇨🇦 Ridgetown | 552 | 1948 |
| 30 | [TG Minto Corporation](https://www.tamtam.ai/c/tg-minto-corporation) (tgminto.com)<br>A company with a heritage of innovation and leadership, focused on achieving manufacturing superiority through world-class processes and product quality | Motor Vehicle Manufacturing | 🇨🇦 Palmerston | 535 | 2001 |
| 31 | [Volkswagen Group Canada Inc.](https://www.tamtam.ai/c/volkswagen-group-canada-inc) (vwgoa.taleo.net)<br>Global distributor of automobile and automotive products, part of Volkswagen Group, supporting dealers across Canada with national operations and training | Motor Vehicle Manufacturing | 🇨🇦 Ajax | 527 | 1952 |
| 32 | [Mazda Canada Inc](https://www.tamtam.ai/c/mazda-canada-inc) (mazda.ca)<br>Distribution of automobiles and automotive parts in Canada, fostering teamwork and growth within a dynamic and challenging environment. | Motor Vehicle Manufacturing | 🇨🇦 Richmond Hill | 476 |  |
| 33 | [IMT Group](https://www.tamtam.ai/c/imt-group) (imtcorporation.com)<br>A leading manufacturer and supplier to various industries, offering closed-die forged components, product innovation, advanced technology, and quality assurance processes | Machinery Manufacturing | 🇨🇦 Kitchener | 476 | 1914 |
| 34 | [Hyundai Auto Canada Corp.](https://www.tamtam.ai/c/hyundai-auto-canada-corp) (hyundaicanada.com)<br>A subsidiary of Hyundai Motor Company, this Canadian company markets a full line-up of award-winning vehicles committed to quality, safety, and design | Motor Vehicle Manufacturing | 🇨🇦 Markham | 467 |  |
| 35 | [THK Rhythm Automotive](https://www.tamtam.ai/c/thk-rhythm-automotive) (thk-rhythm-auto.com)<br>Designs and manufactures linkage and suspension products using high strength materials for optimal performance and fuel efficiency | Motor Vehicle Manufacturing | 🇨🇦 St. Catharines | 446 |  |
| 36 | [Sharp Bus Lines Limited](https://www.tamtam.ai/c/sharp-bus-lines-limited) (sharpbus.com)<br>A leading transportation provider in Southern Ontario offering school bus services with a focus on trust, reliability, integrity, and safety Apply to join their team today | Truck Transportation | 🇨🇦 Brantford | 421 | 1961 |
| 37 | [Mevotech](https://www.tamtam.ai/c/mevotech) (mevotech.com)<br>A North American leader in engineering and designing driveline, steering, and suspension aftermarket auto parts with a focus on customer service, innovation, and collaboration | Motor Vehicle Manufacturing | 🇨🇦 North York | 413 | 1982 |
| 38 | [Mobile Climate Control](https://www.tamtam.ai/c/mobile-climate-control) (mcc-hvac.com)<br>Specializing in custom engineered HVAC systems for commercial vehicles worldwide, providing optimal climate comfort solutions through strong engineering expertise | Industrial Machinery Manufacturing | 🇨🇦 Vaughan | 408 | 1975 |
| 39 | [Subaru Canada Inc](https://www.tamtam.ai/c/subaru-canada-inc) (subaru.ca)<br>A subsidiary of Subaru Corporation, the company has been importing and selling Subaru vehicles in Canada since 1978, with significant growth in sales | Motor Vehicle Manufacturing | 🇨🇦 Mississauga | 387 | 1976 |
| 40 | [Toyota Boshoku Canada, Inc.](https://www.tamtam.ai/c/toyota-boshoku-canada-inc) (toyotaboshoku.ca)<br>Manufactures automotive components for Toyota, specializing in creating innovative interior spaces that exceed customer expectations through quality craftsmanship and efficiency | Motor Vehicle Manufacturing | 🇨🇦 Woodstock | 383 | 1918 |
| 41 | [MetriCan Group of Companies](https://www.tamtam.ai/c/metrican-group-of-companies) (metrican.com)<br>A leading supplier of tooling, value-added assembly, and stamped metal components for automotive manufacturing, focusing on quality, efficiency, and customer-centric solutions | Manufacturing | 🇨🇦 Oakville | 357 | 1976 |
| 42 | [INOAC Exterior Systems Inc.](https://www.tamtam.ai/c/inoac-exterior-systems-inc)<br>Specializing in supplying painted exterior trim products for the automotive industry, focusing on automotive exterior parts | Motor Vehicle Manufacturing | 🇨🇦 Toronto | 354 |  |
| 43 | [Wescast Industries Inc.](https://www.tamtam.ai/c/wescast-industries-inc) (wescast.com)<br>Designs, casts, machines, and assembles exhaust system components including manifolds and turbo charger housings for global automotive manufacturers and Tier 1 suppliers. | Motor Vehicle Manufacturing | 🇨🇦 Brantford | 350 |  |
| 44 | [Switzer-CARTY Transportation](https://www.tamtam.ai/c/switzer-carty-transportation) (switzer-carty.com)<br>A premier school bus transportation and charter bus rental company in Ontario, Canada, focused on delivering safe, secure, and reliable services | School and Employee Bus Services | 🇨🇦 Burlington | 340 | 2011 |
| 45 | [CpK Interior Products Inc.](https://www.tamtam.ai/c/cpk-interior-products-inc) (cpkip.com)<br>A global leader in interior products, specializing in precision manufacturing and innovative solutions for original equipment manufacturers and Tier One suppliers | Motor Vehicle Manufacturing | 🇨🇦 Guelph | 334 |  |
| 46 | [Jefferson Elora Corporation](https://www.tamtam.ai/c/jefferson-elora-corporation) (ca.indeed.com)<br>An auto-parts manufacturer specializing in Metal Stamping and Robotic Welding, committed to delivering high-quality products at low cost Hiring Production Associates | Motor Vehicle Manufacturing | 🇨🇦 Elora | 329 |  |
| 47 | [AirBoss of America](https://www.tamtam.ai/c/airboss-of-america) (airboss.com)<br>A group of businesses specializing in rubber compounding, engineering, and military products, offering innovative solutions and high-quality rubber products for various applications | Chemical Manufacturing | 🇨🇦 Newmarket | 327 | 1989 |
| 48 | [Simcoe Parts Service Inc.](https://www.tamtam.ai/c/simcoe-parts-service-inc) (simcoeparts.com)<br>Premier logistics supplier based in Ontario, focusing on world-class management services with high standards in quality, cost, delivery, safety, and environment Email for job opportunities | Transportation, Logistics, Supply Chain and Storage | 🇨🇦 Alliston | 322 | 1988 |
| 49 | [Waabi](https://www.tamtam.ai/c/waabi) (waabi.ai)<br>AI company led by Raquel Urtasun creating advanced self-driving technology with a focus on safety, backed by top investors and innovative approach | Truck Transportation | 🇨🇦 Toronto | 319 | 2021 |
| 50 | [Marwood International Inc.](https://www.tamtam.ai/c/marwood-international-inc) (marwoodinternational.com)<br>An award-winning team specializing in structural components and modular assemblies for the automotive industry, offering quality products and responsive customer service | Motor Vehicle Manufacturing | 🇨🇦 Tillsonburg | 310 | 1990 |

## How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 12, 2026.

## More company lists in Ontario

- [The largest companies in Ontario](https://www.tamtam.ai/l/largest-companies-ontario) (5,032)
- [Multinational companies in Ontario](https://www.tamtam.ai/l/multinational-companies-ontario) (901)
- [Financial services firms in Ontario](https://www.tamtam.ai/l/financial-services-firms-ontario) (396)
- [Manufacturers in Ontario](https://www.tamtam.ai/l/manufacturers-ontario) (389)
- [Critical infrastructure operators in Ontario](https://www.tamtam.ai/l/critical-infrastructure-operators-ontario) (344)
- [Retail chains in Ontario](https://www.tamtam.ai/l/retail-chains-ontario) (327)
- [Companies with in-house R&D in Ontario](https://www.tamtam.ai/l/r-and-d-companies-ontario) (300)
- [Logistics companies in Ontario](https://www.tamtam.ai/l/logistics-companies-ontario) (285)
- [Education providers in Ontario](https://www.tamtam.ai/l/education-companies-ontario) (276)
- [SaaS companies in Ontario](https://www.tamtam.ai/l/saas-companies-ontario) (275)
- [Truck Transportation companies in Ontario](https://www.tamtam.ai/l/truck-transportation-companies-ontario) (270)
- [Transportation, Logistics, Supply Chain and Storage companies in Ontario](https://www.tamtam.ai/l/transportation-logistics-supply-chain-and-storage-companies-ontario) (261)
- [Public sector organisations in Ontario](https://www.tamtam.ai/l/public-sector-organisations-ontario) (259)
- [Financial Services companies in Ontario](https://www.tamtam.ai/l/financial-services-companies-ontario) (250)
- [IT Services and IT Consulting companies in Ontario](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-ontario) (235)
- [Software Development companies in Ontario](https://www.tamtam.ai/l/software-development-companies-ontario) (231)
- [Healthcare providers in Ontario](https://www.tamtam.ai/l/healthcare-providers-ontario) (226)
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- [Professional services firms in Ontario](https://www.tamtam.ai/l/professional-services-firms-ontario) (211)
- [Hospitals and Health Care companies in Ontario](https://www.tamtam.ai/l/hospitals-and-health-care-companies-ontario) (205)
- [Distributors and wholesalers in Ontario](https://www.tamtam.ai/l/distributors-and-wholesalers-ontario) (183)
- [Companies with a mobile app in Ontario](https://www.tamtam.ai/l/companies-with-mobile-app-ontario) (181)
- [Publicly traded companies in Ontario](https://www.tamtam.ai/l/publicly-traded-companies-ontario) (156)
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## The same list elsewhere in Canada

- [Automotive manufacturers and suppliers in Canada](https://www.tamtam.ai/l/automotive-companies-canada) (127)

## The same list elsewhere

- [Automotive manufacturers and suppliers in the world](https://www.tamtam.ai/l/automotive-companies-in-the-world) (5,885)
- [Automotive manufacturers and suppliers in North America](https://www.tamtam.ai/l/automotive-companies-in-north-america) (1,324)

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Source: https://www.tamtam.ai/l/automotive-companies-ontario