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.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Department of National Defence/Ministère de la défense nationalecanada.ca
A government department in Canada responsible for defending national interests, contributing to international peace and security, and supporting the Canadian Forces |
28,747 | |||
| 2 |
Canadian Armed Forces | Forces armées canadiennesforces.ca
Offering over 100 trades, the organization provides world-class qualifications, competitive salaries, benefits, stability, and exciting opportunities for travel, adventure, and making a difference |
20,412 | |||
| 3 |
Celesticacelestica.com
Global leader in providing design, manufacturing, and supply chain solutions for aerospace, defense, communications, healthtech, and more, delivering innovative solutions for complex challenges |
16,022 | |||
| 4 | 4,478 | ||||
| 5 |
Magellan Aerospace Limitedmagellan.aero
Designs and manufactures aeroengine and aerostructure components, advanced military and space products, plus engine repair and overhaul services globally. |
2,050 | |||
| 6 |
BlackBerryblackberry.com
Provides intelligent software and services to enterprises and governments, enabling transformative applications, new revenue streams, and innovative business models with safety, security, and reliability. |
2,005 | |||
| 7 |
Royal Canadian Navy | Marine royale canadiennelinktr.ee
The organization is the naval force of Canada, comprising regular, reserve sailors, and civilian employees, focusing on generating combat-capable maritime forces worldwide |
1,857 | |||
| 8 |
Defence Construction Canadadcc-cdc.gc.ca
A Crown corporation providing contracting, construction management, infrastructure, environmental, and lifecycle support services for Canada's defence requirements through five service lines |
1,372 | |||
| 9 |
General Dynamics Mission Systems–Canadagdmissionsystems.ca
A leading Canadian defense and security technology organization, focused on innovation, community involvement, and supporting military needs worldwide |
1,270 | |||
| 10 |
Defence Research and Development Canada | Recherche et développement pour la défense Canadadrdc-rddc.gc.ca
Provides department of national defense and armed forces with technological advantages and scientific knowledge through seven research centers to protect interests nationwide. |
603 | |||
| 11 |
General Dynamics Land Systems–Canadagdlscanada.com
Global leader in providing innovative land and amphibious combat vehicle solutions through cutting-edge technologies in machining, electronics, software development, and systems integration |
576 | |||
| 12 |
Canadian Army | Armée canadiennecanada.ca
The Canadian Army is the land component of the Canadian Armed Forces, producing well-trained soldiers ready for operations at home and abroad |
565 | |||
| 13 |
Vector Aerospacestandardaero.com
Global provider of aviation maintenance, repair, and overhaul services for gas turbine engines, components, and helicopter airframes. |
527 | |||
| 14 |
Royal Canadian Air Force | Aviation royale canadiennecanada.ca
The Canadian Armed Forces offers over 100 trades, world-class qualifications, competitive pay, travel opportunities, and a chance to make a difference |
485 | |||
| 15 |
IMT Groupimtcorporation.com
A leading manufacturer and supplier to various industries, offering closed-die forged components, product innovation, advanced technology, and quality assurance processes |
476 | |||
| 16 |
JSIjsitelecom.com
A trusted provider of lawful intelligence and AI-enabled analytics solutions, helping law enforcement and security agencies globally with critical missions |
470 | |||
| 17 |
MHI Canada Aerospace, Inc.mhi.com
A Tier 1 manufacturer of aircraft structures and assemblies, specializing in Bombardier business aircraft components with a focus on precision and on-time delivery |
449 | |||
| 18 |
Mubea Cyclone Manufacturingcyclonemfg.com
Vertically integrated provider of aerospace component manufacturing, including machining, sheet metal fabrication, tube bending, welding, and surface treatment processes for major OEMs |
425 | |||
| 19 |
Babcock Canada Inc.babcockcanada.com
A leading international Aerospace, Defence, and Security company providing submarine sustainment, aviation services, aerial wildfire suppression, air medical transportation, and aircrew training |
407 | |||
| 20 |
ADGA Groupadga.ca
Canadian defence company providing cybersecurity, simulation, systems engineering, and program management services for government and industry clients. |
330 | |||
| 21 |
AirBoss of Americaairboss.com
A group of businesses specializing in rubber compounding, engineering, and military products, offering innovative solutions and high-quality rubber products for various applications |
327 | |||
| 22 |
University of Toronto Aerospace Teamutat.ca
Interdisciplinary design team creating drones, rockets, satellites, and advocating for aerospace sustainability through policy and outreach initiatives in STEM education |
278 | |||
| 23 |
Nasittuq Corporationnasittuq.com
The company provides in-service support, facility operations, and maintenance for the North Warning System, along with site management services in Nunavut |
270 | |||
| 24 |
Arnprior Aerospace Inc.arnprioraerospace.com
Aerospace and Defense company with 50+ years experience in design, production, and support of structural components, offering in-house manufacturing and integration solutions |
230 | |||
| 25 |
Kepler Communications Inc.kepler.space
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. |
220 | |||
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| 26 |
Amphenol Canada Corp.amphenolcanada.com
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 |
206 | |||
| 27 |
Telesattelesat.com
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. |
201 | |||
| 28 |
Gastopsgastops.com
Specializing in advanced equipment health sensing and analysis products, engineering services, and proactive maintenance solutions for defense, aerospace, energy, and marine industries |
191 | |||
| 29 |
Roshel Smart Armored Vehiclesroshel.com
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 |
185 | |||
| 30 |
HPG LPprecinmac.com
An international leader in engineering and manufacturing components for aerospace, energy, oil & gas, and marine markets with over 50 years of experience |
124 | |||
| 31 |
Airbus Helicopters Canada Limitedairbushelicopters.ca
Leading provider of helicopters in Canada, offering manufacturing, sales, support, and training solutions for a wide range of Airbus rotary-wing aircraft |
110 | |||
| 32 |
Allen-Vanguardallenvanguard.com
The company offers protection solutions against RCIEDs and drones, ensuring spectrum dominance in harsh RF environments with advanced jamming and sensing techniques |
99 | |||
| 33 |
Colt Canadacoltcanada.com
A world-class manufacturer of small arms and military equipment, prioritizing customer feedback to continually innovate and improve product capabilities |
96 | |||
| 34 |
Trimaster Manufacturingprecinmac.com
Leading supplier of precision machined components and electro-mechanical subassemblies for various industries, with exceptional performance metrics and Fortune 500 clients |
91 | |||
| 35 | 87 | ||||
| 36 |
Safran Electronics & Defense Canada Inc.safran-group.com
Specializing in aerospace and defense applications, the company develops, produces, and maintains embedded computers and systems with full engineering and support capabilities |
77 | |||
| 37 |
Ben Machine Products Co. Inc.benmachine.com
An advanced manufacturing facility specializing in CNC milling, turning, sheet metal fabrication, welding, and assembly for military, aerospace, and high-tech industries |
60 | |||
| 38 |
Navtech An Airbus Companynavtech.aero
Global provider of flight operations solutions for 400+ airlines, offering aeronautical charts, navigation data, flight planning, aircraft performance, and crew planning solutions worldwide |
55 | |||
| 39 |
Avion Technologies, Inc.avion-tech.com
Provider of contract manufacturing services for defense, aerospace, and heavy equipment industries, specializing in high quality gear manufacturing and components |
52 | |||
| 40 |
Liburdi Group of Companiesliburdi.com
A leader in gas turbine repair, life extensions, and specialized welding services Offers custom engineering, welding solutions, and automated welding systems |
48 | |||
| 41 |
Burloak Technologiesburloaktech.com
Leader in Additive Manufacturing delivering integrated solutions for aerospace, energy, automotive industries Specializing in engineering, materials development, precision machining, and post-processing services |
48 | |||
| 42 |
RAMPF Composite Solutions (CAN)rampf-group.com
A leading expert in manufacturing carbon fiber and fiberglass composites for aerospace and medical industries, offering vertical integration and innovative solutions |
43 | |||
| 43 |
Aerospace Industries Association of Canada (AIAC)\Association des industries aérospatiales du Canadaaiac.ca
An advocate for aerospace policy issues that support Canadian aerospace companies and jobs, fostering competitiveness and seizing new opportunities |
33 | |||
| 44 |
Magnum Integrated Technologiesmit-world.com
A multi-divisional corporation with expertise in designing, engineering, manufacturing, and installing custom equipment for the metals and hydroelectric industries worldwide |
28 | |||
| 45 | 27 | ||||
| 46 |
MACFAB Manufacturing Inc.macfab.ca
A leading contract manufacturer specializing in precision components for analytical instruments, optics, defence, and aerospace industries worldwide since 1987 |
26 | |||
| 47 |
Garrtech Inc.garrtech.com
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 |
17 | |||
| 48 |
Universal Precision Technologyuniversaltoolanddie.com
A leading precision manufacturing company providing complete solutions for aerospace, military, and optical industries with state-of-the-art equipment and dedicated personnel |
16 | |||
| 49 |
Echo-Tech Machine & Tool Ltd.echo-tech.ca
Precision manufacturer of tools, custom production machines, jigs, fixtures, prototypes, and small specialty production dies with expertise in manufacturing solutions |
15 | |||
| 50 | 15 | ||||
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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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The same list elsewhere in Canada
- Aerospace and defence companies in Canada 133
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