# 50 leading aerospace and defence companies in Ontario

Tamtam tracks 61 aerospace and defence companies headquartered in Ontario. This list ranks the 50 largest by number of employees on LinkedIn, led by Department of National Defence/Ministère de la défense nationale, Canadian Armed Forces | Forces armées canadiennes and Celestica. Their median headcount is 220. Half of them were founded in 1987 or later. The most common headquarters are Ottawa (16), Toronto (5) and Mississauga (4).

This selection of companies in Ontario's aerospace and defence sector includes large government organizations and established private firms. Among them are the Department of National Defence, a Canadian government department, and the Canadian Armed Forces, which offers various career opportunities. Celestica specializes in design, manufacturing, and supply chain solutions for multiple high-tech industries, including aerospace and defence. MDA Space is a global leader in robotics, communication satellites, and geointelligence. Magellan Aerospace Limited designs and manufactures aeroengine and aerostructure components, while BlackBerry provides intelligent software and services to governments and enterprises.

The data shows a strong concentration of headquarters in Ottawa, with many of the listed entities, particularly those related to the Armed Forces and defence research, based there. Other significant locations include Toronto, home to Celestica and Vector Aerospace, and Mississauga, where Magellan Aerospace Limited is located. The companies range from large governmental bodies to private manufacturers of components and software.

🇨🇦 Ontario · 50 companies · Updated Nov 15, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Department of National Defence/Ministère de la défense nationale](https://www.tamtam.ai/c/department-of-national-defence-ministere-de-la-defense-nationale) (canada.ca)<br>A government department in Canada responsible for defending national interests, contributing to international peace and security, and supporting the Canadian Forces | Armed Forces | 🇨🇦 Ottawa | 28,747 |  |
| 2 | [Canadian Armed Forces \| Forces armées canadiennes](https://www.tamtam.ai/c/canadian-armed-forces-forces-armees-canadiennes) (forces.ca)<br>Offering over 100 trades, the organization provides world-class qualifications, competitive salaries, benefits, stability, and exciting opportunities for travel, adventure, and making a difference | Armed Forces | 🇨🇦 Ottawa | 20,412 |  |
| 3 | [Celestica](https://www.tamtam.ai/c/celestica) (celestica.com)<br>Global leader in providing design, manufacturing, and supply chain solutions for aerospace, defense, communications, healthtech, and more, delivering innovative solutions for complex challenges | Technology, Information and Internet | 🇨🇦 Toronto | 16,022 | 1994 |
| 4 | [MDA Space](https://www.tamtam.ai/c/mda-space) (mda.space)<br>Global leader providing robotics, communications satellites, geointelligence, and space exploration infrastructure through engineering excellence for defense and commercial missions across the world. | Defense and Space Manufacturing | 🇨🇦 Brampton | 4,478 | 1969 |
| 5 | [Magellan Aerospace Limited](https://www.tamtam.ai/c/magellan-aerospace-limited) (magellan.aero)<br>Designs and manufactures aeroengine and aerostructure components, advanced military and space products, plus engine repair and overhaul services globally. | Aviation and Aerospace Component Manufacturing | 🇨🇦 Mississauga | 2,050 |  |
| 6 | [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 |  |
| 7 | [Royal Canadian Navy \| Marine royale canadienne](https://www.tamtam.ai/c/royal-canadian-navy-marine-royale-canadienne) (linktr.ee)<br>The organization is the naval force of Canada, comprising regular, reserve sailors, and civilian employees, focusing on generating combat-capable maritime forces worldwide | Armed Forces | 🇨🇦 Ottawa | 1,857 | 1910 |
| 8 | [Defence Construction Canada](https://www.tamtam.ai/c/defence-construction-canada) (dcc-cdc.gc.ca)<br>A Crown corporation providing contracting, construction management, infrastructure, environmental, and lifecycle support services for Canada's defence requirements through five service lines | Construction | 🇨🇦 Ottawa | 1,372 | 1951 |
| 9 | [General Dynamics Mission Systems–Canada](https://www.tamtam.ai/c/general-dynamics-mission-systems-canada) (gdmissionsystems.ca)<br>A leading Canadian defense and security technology organization, focused on innovation, community involvement, and supporting military needs worldwide | Defense and Space Manufacturing | 🇨🇦 Ottawa | 1,270 |  |
| 10 | [Defence Research and Development Canada \| Recherche et développement pour la défense Canada](https://www.tamtam.ai/c/defence-research-and-development-canada-recherche-et-developpement-pour-la) (drdc-rddc.gc.ca)<br>Provides department of national defense and armed forces with technological advantages and scientific knowledge through seven research centers to protect interests nationwide. | Defense and Space Manufacturing | 🇨🇦 Ottawa | 603 |  |
| 11 | [General Dynamics Land Systems–Canada](https://www.tamtam.ai/c/general-dynamics-land-systems-canada) (gdlscanada.com)<br>Global leader in providing innovative land and amphibious combat vehicle solutions through cutting-edge technologies in machining, electronics, software development, and systems integration | Defense and Space Manufacturing | 🇨🇦 London | 576 |  |
| 12 | [Canadian Army \| Armée canadienne](https://www.tamtam.ai/c/canadian-army-armee-canadienne) (canada.ca)<br>The Canadian Army is the land component of the Canadian Armed Forces, producing well-trained soldiers ready for operations at home and abroad | Armed Forces | 🇨🇦 Ottawa | 565 |  |
| 13 | [Vector Aerospace](https://www.tamtam.ai/c/vector-aerospace) (standardaero.com)<br>Global provider of aviation maintenance, repair, and overhaul services for gas turbine engines, components, and helicopter airframes. | Aviation and Aerospace Component Manufacturing | 🇨🇦 Toronto | 527 | 1998 |
| 14 | [Royal Canadian Air Force \| Aviation royale canadienne](https://www.tamtam.ai/c/royal-canadian-air-force-aviation-royale-canadienne) (canada.ca)<br>The Canadian Armed Forces offers over 100 trades, world-class qualifications, competitive pay, travel opportunities, and a chance to make a difference | Armed Forces | 🇨🇦 Ottawa | 485 |  |
| 15 | [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 |
| 16 | [JSI](https://www.tamtam.ai/c/jsi-ottawa) (jsitelecom.com)<br>A trusted provider of lawful intelligence and AI-enabled analytics solutions, helping law enforcement and security agencies globally with critical missions | Software Development | 🇨🇦 Ottawa | 470 | 1979 |
| 17 | [MHI Canada Aerospace, Inc.](https://www.tamtam.ai/c/mhi-canada-aerospace-inc) (mhi.com)<br>A Tier 1 manufacturer of aircraft structures and assemblies, specializing in Bombardier business aircraft components with a focus on precision and on-time delivery | Aviation and Aerospace Component Manufacturing | 🇨🇦 Mississsauga | 449 | 2006 |
| 18 | [Mubea Cyclone Manufacturing](https://www.tamtam.ai/c/mubea-cyclone-manufacturing) (cyclonemfg.com)<br>Vertically integrated provider of aerospace component manufacturing, including machining, sheet metal fabrication, tube bending, welding, and surface treatment processes for major OEMs | Aviation and Aerospace Component Manufacturing | 🇨🇦 Mississauga | 425 | 1964 |
| 19 | [Babcock Canada Inc.](https://www.tamtam.ai/c/babcock-canada-inc) (babcockcanada.com)<br>A leading international Aerospace, Defence, and Security company providing submarine sustainment, aviation services, aerial wildfire suppression, air medical transportation, and aircrew training | Defense and Space Manufacturing | 🇨🇦 Ottawa | 407 | 2008 |
| 20 | [ADGA Group](https://www.tamtam.ai/c/adga-group) (adga.ca)<br>Canadian defence company providing cybersecurity, simulation, systems engineering, and program management services for government and industry clients. | Professional Services | 🇨🇦 Ottawa | 330 | 1967 |
| 21 | [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 |
| 22 | [University of Toronto Aerospace Team](https://www.tamtam.ai/c/university-of-toronto-aerospace-team) (utat.ca)<br>Interdisciplinary design team creating drones, rockets, satellites, and advocating for aerospace sustainability through policy and outreach initiatives in STEM education | Aviation and Aerospace Component Manufacturing | 🇨🇦 Toronto | 278 | 2004 |
| 23 | [Nasittuq Corporation](https://www.tamtam.ai/c/nasittuq-corporation) (nasittuq.com)<br>The company provides in-service support, facility operations, and maintenance for the North Warning System, along with site management services in Nunavut | Facilities Services | 🇨🇦 Ottawa | 270 | 2000 |
| 24 | [Arnprior Aerospace Inc.](https://www.tamtam.ai/c/arnprior-aerospace-inc) (arnprioraerospace.com)<br>Aerospace and Defense company with 50+ years experience in design, production, and support of structural components, offering in-house manufacturing and integration solutions | Aviation and Aerospace Component Manufacturing | 🇨🇦 Arnprior | 230 | 2005 |
| 25 | [Kepler Communications Inc.](https://www.tamtam.ai/c/kepler-communications-inc) (kepler.space)<br>Delivers on-orbit data at lightspeed with a satellite constellation, acting as Internet exchange points for space-to-space data relay. Modernizes communications for space missions. | Telecommunications | 🇨🇦 Toronto | 220 | 2015 |
| 26 | [Amphenol Canada Corp.](https://www.tamtam.ai/c/amphenol-canada-corp) (amphenolcanada.com)<br>Global provider of interconnect solutions for electronic equipment manufacturers worldwide across various industries, with a focus on design creativity, cost effectiveness, and leading-edge technology | Appliances, Electrical, and Electronics Manufacturing | 🇨🇦 Markham | 206 | 1954 |
| 27 | [Telesat](https://www.tamtam.ai/c/telesat) (telesat.com)<br>Provides satellite communication services, headquartered in Ottawa with offices in the United States and Brazil, acquired by Loral Space & Communications and Public Pension Investment Board. | Telecommunications | 🇨🇦 Ottawa | 201 | 1969 |
| 28 | [Gastops](https://www.tamtam.ai/c/gastops) (gastops.com)<br>Specializing in advanced equipment health sensing and analysis products, engineering services, and proactive maintenance solutions for defense, aerospace, energy, and marine industries | Industrial Machinery Manufacturing | 🇨🇦 Ottawa | 191 | 1979 |
| 29 | [Roshel Smart Armored Vehicles](https://www.tamtam.ai/c/roshel-smart-armored-vehicles) (roshel.com)<br>Manufacturer of smart armoured vehicles for cash-in-transit and law enforcement industries, offering integrated security solutions like access control management, fleet tracking, and telematics | Motor Vehicle Manufacturing | 🇨🇦 Brampton | 185 | 2016 |
| 30 | [HPG LP](https://www.tamtam.ai/c/hpg-lp) (precinmac.com)<br>An international leader in engineering and manufacturing components for aerospace, energy, oil & gas, and marine markets with over 50 years of experience | Aviation and Aerospace Component Manufacturing | 🇨🇦 Milton | 124 | 1969 |
| 31 | [Airbus Helicopters Canada Limited](https://www.tamtam.ai/c/airbus-helicopters-canada-limited) (airbushelicopters.ca)<br>Leading provider of helicopters in Canada, offering manufacturing, sales, support, and training solutions for a wide range of Airbus rotary-wing aircraft | Airlines and Aviation | 🇨🇦 Fort Erie | 110 |  |
| 32 | [Allen-Vanguard](https://www.tamtam.ai/c/allen-vanguard) (allenvanguard.com)<br>The company offers protection solutions against RCIEDs and drones, ensuring spectrum dominance in harsh RF environments with advanced jamming and sensing techniques | Defense and Space Manufacturing | 🇨🇦 Ottawa | 99 |  |
| 33 | [Colt Canada](https://www.tamtam.ai/c/colt-canada) (coltcanada.com)<br>A world-class manufacturer of small arms and military equipment, prioritizing customer feedback to continually innovate and improve product capabilities | Defense and Space Manufacturing | 🇨🇦 Kitchener | 96 | 1976 |
| 34 | [Trimaster Manufacturing](https://www.tamtam.ai/c/trimaster-manufacturing) (precinmac.com)<br>Leading supplier of precision machined components and electro-mechanical subassemblies for various industries, with exceptional performance metrics and Fortune 500 clients | Aviation and Aerospace Component Manufacturing | 🇨🇦 Guelph | 91 | 1974 |
| 35 | [FBT Inc.](https://www.tamtam.ai/c/fbt-inc) (fbtinc.ca)<br>Advanced manufacturing company specializing in precision machined components with state-of-the-art facility and expertise in working with various materials, offering solutions for improved quality and cost reductions | Industrial Machinery Manufacturing | 🇨🇦 St. Catharines | 87 | 1945 |
| 36 | [Safran Electronics & Defense Canada Inc.](https://www.tamtam.ai/c/safran-electronics-and-defense-canada-inc) (safran-group.com)<br>Specializing in aerospace and defense applications, the company develops, produces, and maintains embedded computers and systems with full engineering and support capabilities | Aviation and Aerospace Component Manufacturing | 🇨🇦 Peterborough | 77 |  |
| 37 | [Ben Machine Products Co. Inc.](https://www.tamtam.ai/c/ben-machine-products-co-inc) (benmachine.com)<br>An advanced manufacturing facility specializing in CNC milling, turning, sheet metal fabrication, welding, and assembly for military, aerospace, and high-tech industries | Defense and Space Manufacturing | 🇨🇦 Vaughan | 60 | 1973 |
| 38 | [Navtech An Airbus Company](https://www.tamtam.ai/c/navtech-an-airbus-company) (navtech.aero)<br>Global provider of flight operations solutions for 400+ airlines, offering aeronautical charts, navigation data, flight planning, aircraft performance, and crew planning solutions worldwide | Airlines/Aviation | 🇨🇦 Waterloo | 55 | 1981 |
| 39 | [Avion Technologies, Inc.](https://www.tamtam.ai/c/avion-technologies-inc) (avion-tech.com)<br>Provider of contract manufacturing services for defense, aerospace, and heavy equipment industries, specializing in high quality gear manufacturing and components | Aviation and Aerospace Component Manufacturing | 🇨🇦 Mississauga | 52 | 1995 |
| 40 | [Liburdi Group of Companies](https://www.tamtam.ai/c/liburdi-group-of-companies) (liburdi.com)<br>A leader in gas turbine repair, life extensions, and specialized welding services Offers custom engineering, welding solutions, and automated welding systems | Automation Machinery Manufacturing | 🇨🇦 Dundas | 48 | 1979 |
| 41 | [Burloak Technologies](https://www.tamtam.ai/c/burloak-technologies) (burloaktech.com)<br>Leader in Additive Manufacturing delivering integrated solutions for aerospace, energy, automotive industries Specializing in engineering, materials development, precision machining, and post-processing services | Industrial Machinery Manufacturing | 🇨🇦 Oakville | 48 | 2005 |
| 42 | [RAMPF Composite Solutions (CAN)](https://www.tamtam.ai/c/rampf-composite-solutions-can) (rampf-group.com)<br>A leading expert in manufacturing carbon fiber and fiberglass composites for aerospace and medical industries, offering vertical integration and innovative solutions | Aviation and Aerospace Component Manufacturing | 🇨🇦 Burlington | 43 |  |
| 43 | [Aerospace Industries Association of Canada (AIAC)\Association des industries aérospatiales du Canada](https://www.tamtam.ai/c/aerospace-industries-association-of-canada-aiac-association-des-industries) (aiac.ca)<br>An advocate for aerospace policy issues that support Canadian aerospace companies and jobs, fostering competitiveness and seizing new opportunities | Aviation and Aerospace Component Manufacturing | 🇨🇦 Ottawa | 33 |  |
| 44 | [Magnum Integrated Technologies](https://www.tamtam.ai/c/magnum-integrated-technologies) (mit-world.com)<br>A multi-divisional corporation with expertise in designing, engineering, manufacturing, and installing custom equipment for the metals and hydroelectric industries worldwide | Industrial Machinery Manufacturing | 🇨🇦 Brampton | 28 | 1993 |
| 45 | [PCI](https://www.tamtam.ai/c/pci) (gopci.ca)<br>A leader in composite manufacturing, specializing in innovative products for aerospace, defense, medical, and marine industries, with a focus on quality and collaboration | Aviation and Aerospace Component Manufacturing | 🇨🇦 Toronto | 27 | 2014 |
| 46 | [MACFAB Manufacturing Inc.](https://www.tamtam.ai/c/macfab-manufacturing-inc) (macfab.ca)<br>A leading contract manufacturer specializing in precision components for analytical instruments, optics, defence, and aerospace industries worldwide since 1987 | Mechanical Or Industrial Engineering | 🇨🇦 Mississauga | 26 | 1987 |
| 47 | [Garrtech Inc.](https://www.tamtam.ai/c/garrtech-inc) (garrtech.com)<br>Manufacturer specializing in blow molds for plastics packaging, as well as precision machining for aerospace, medical, energy, and nuclear components Committed to quality and customer satisfaction | Machinery Manufacturing | 🇨🇦 Burlington | 17 | 1991 |
| 48 | [Universal Precision Technology](https://www.tamtam.ai/c/universal-precision-technology) (universaltoolanddie.com)<br>A leading precision manufacturing company providing complete solutions for aerospace, military, and optical industries with state-of-the-art equipment and dedicated personnel | Aviation and Aerospace Component Manufacturing | 🇨🇦 Stoney Creek | 16 | 1992 |
| 49 | [Echo-Tech Machine & Tool Ltd.](https://www.tamtam.ai/c/echo-tech-machine-and-tool-ltd) (echo-tech.ca)<br>Precision manufacturer of tools, custom production machines, jigs, fixtures, prototypes, and small specialty production dies with expertise in manufacturing solutions | Fabricated Metal Products | 🇨🇦 St Marys | 15 | 2002 |
| 50 | [ATMIS](https://www.tamtam.ai/c/atmis) (atmis.ca)<br>A fully integrated Indigenous-owned Canadian corporation providing design, engineering, manufacturing, and supply chain solutions for various sectors, specializing in custom machinery and automation | Manufacturing | 🇨🇦 Chatham-Kent | 15 |  |

## 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 15, 2026.

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- [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) (388)
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## The same list elsewhere in Canada

- [Aerospace and defence companies in Canada](https://www.tamtam.ai/l/aerospace-and-defense-companies-canada) (133)
- [Aerospace and defence companies in the province of Quebec](https://www.tamtam.ai/l/aerospace-and-defense-companies-province-of-quebec) (34)

## The same list elsewhere

- [Aerospace and defence companies in the world](https://www.tamtam.ai/l/aerospace-and-defense-companies-in-the-world) (6,083)

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Source: https://www.tamtam.ai/l/aerospace-and-defense-companies-ontario