# 31 leading electronics and semiconductor companies in Ontario

Tamtam tracks 31 electronics and semiconductor companies headquartered in Ontario. This list ranks all of them by number of employees on LinkedIn, led by Celestica, Canadian Solar Inc. and Huawei Canada. Their median headcount is 131. Half of them were founded in 1996 or later. The most common headquarters are Toronto (8), Mississauga (5) and Markham (4).

This list features a selection of electronics and semiconductor companies based in Ontario. The companies range from large global players like Celestica, which offers design and manufacturing solutions across various high-tech sectors, to mid-sized firms such as Canadian Solar Inc., a global manufacturer of photovoltaic modules. Other notable companies include Huawei Canada, a telecommunications provider, and Tenstorrent, which builds AI computers.

A common pattern among these companies is their strong presence in advanced technology sectors. While Toronto is a prominent headquarters city, there is also a significant cluster of companies in the Kitchener-Waterloo area, such as Teledyne DALSA, specializing in image sensing, and Thalmic Labs, focused on wearable technology.

🇨🇦 Ontario · 31 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [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 |
| 2 | [Canadian Solar Inc.](https://www.tamtam.ai/c/canadian-solar-inc) (csisolar.com)<br>Global manufacturer of photovoltaic modules and inverters developing utility-scale solar power and battery energy storage projects with over 165 GW delivered worldwide. | Renewable Energy Semiconductor Manufacturing | 🇨🇦 Kitchener | 2,240 | 2001 |
| 3 | [Huawei Canada](https://www.tamtam.ai/c/huawei-canada) (consumer.huawei.com)<br>A global provider of ICT infrastructure and smart devices, committed to connecting the world through innovative research and development in Canada | Telecommunications | 🇨🇦 Markham | 1,758 | 1987 |
| 4 | [Tenstorrent](https://www.tamtam.ai/c/tenstorrent) (tenstorrent.com)<br>Tenstorrent builds next-generation AI computers, combining expertise in computer architecture, ASIC design, systems, and neural network compilers Offices worldwide Join our team! | Computer Hardware Manufacturing | 🇨🇦 Toronto | 1,226 | 2016 |
| 5 | [Teledyne DALSA](https://www.tamtam.ai/c/teledyne-dalsa) (teledynedalsa.com)<br>Specialized in high-performance image sensing, semiconductor fabrication, and 3D geospatial systems with global R&D and support locations. | Appliances, Electrical, and Electronics Manufacturing | 🇨🇦 Waterloo | 863 | 1980 |
| 6 | [Alphawave Semi](https://www.tamtam.ai/c/alphawave-semi) (awavesemi.com)<br>Specializing in silicon technology for digital communication networks, we strive to provide high performance, reliability, and low power solutions | Semiconductor Manufacturing | 🇨🇦 Toronto | 702 | 2017 |
| 7 | [Silfab Solar Inc.](https://www.tamtam.ai/c/silfab-solar-inc) (silfabsolar.com)<br>North American designer and manufacturer of high-efficiency photovoltaic modules using automated production lines across facilities in Washington, Toronto, and South Carolina. | Renewable Energy Semiconductor Manufacturing | 🇨🇦 Mississauga | 421 | 2010 |
| 8 | [Xanadu](https://www.tamtam.ai/c/xanadu-toronto) (xanadu.ai)<br>A Canadian quantum technology company advancing photonic quantum hardware, quantum computing, and quantum machine learning through hardware, software, and research | Computer Hardware Manufacturing | 🇨🇦 Toronto | 348 | 2016 |
| 9 | [Thalmic Labs](https://www.tamtam.ai/c/thalmic-labs) (thalmic.com)<br>Pioneering wearable technology company revolutionizing human-device interaction with the Myo armband, measuring muscle activity to control digital devices wirelessly | Consumer Electronics | 🇨🇦 Kitchener | 334 | 2012 |
| 10 | [Panasonic Canada](https://www.tamtam.ai/c/panasonic-canada) (panasonic.com)<br>A provider of digital and electronics products and solutions for consumer, business, and industrial needs, empowering professionals and improving lives with innovative technologies | Appliances, Electrical, and Electronics Manufacturing | 🇨🇦 Mississauga | 294 |  |
| 11 | [GAO RFID Inc.](https://www.tamtam.ai/c/gao-rfid-inc) (gaorfid.com)<br>A leading supplier of RFID products and solutions, offering high-quality off-the-shelf products and customized solutions to a global customer base | IT Services and IT Consulting | 🇨🇦 Toronto | 233 | 2006 |
| 12 | [NDI (Northern Digital Inc.)](https://www.tamtam.ai/c/ndi-northern-digital-inc) (ndigital.com)<br>Global leader in optical and electromagnetic navigation technology for medical devices, offering accurate instrument tracking in various applications for improved workflow and procedure efficacy | Medical Equipment Manufacturing | 🇨🇦 Waterloo | 229 | 1981 |
| 13 | [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 |
| 14 | [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 |
| 15 | [ECI Technology Group Inc.](https://www.tamtam.ai/c/eci-technology-group-inc) (ecitech.com)<br>Full turnkey electronics manufacturing service provider specializing in Electro-Mechanical design, development, and manufacturing solutions for a wide range of electronics OEMs | Appliances, Electrical, and Electronics Manufacturing | 🇨🇦 Toronto | 135 | 1997 |
| 16 | [KATEK Canada](https://www.tamtam.ai/c/katek-canada) (kontron.com)<br>An Electronic Manufacturing Services provider specializing in end-to-end assembly services for complex electronic products in various industries, focused on innovation and operational excellence | Appliances, Electrical, and Electronics Manufacturing | 🇨🇦 Cornwall | 131 |  |
| 17 | [Microart Services Inc.](https://www.tamtam.ai/c/microart-services-inc) (microartservices.com)<br>Electronic manufacturing and design services company offering circuit design, PCB layout, manufacturing, assembly, testing, and box build for prototype and low-to-mid volume productions | Appliances, Electrical, and Electronics Manufacturing | 🇨🇦 Markham | 125 | 1981 |
| 18 | [OES Inc.](https://www.tamtam.ai/c/oes-inc) (oes-inc.com)<br>The company specializes in providing EMS solutions, LED video displays, scoreboard solutions, and wire harness quality assurance devices for various industries worldwide | Appliances, Electrical, and Electronics Manufacturing | 🇨🇦 Ontario | 125 | 1980 |
| 19 | [TDG Transit Design Group Inc](https://www.tamtam.ai/c/tdg-transit-design-group-inc) (tdgdesign.com)<br>An industry leader in developing LED, Fluorescent, and energy storage solutions for rail vehicles with a global presence since 1989 Specializing in innovative lighting systems | Railroad Equipment Manufacturing | 🇨🇦 Mississauga | 118 | 1989 |
| 20 | [Jabil Software Services](https://www.tamtam.ai/c/jabil-software-services) (jabil.com)<br>A global manufacturing solutions provider focused on technological advancement, trusted by leading brands, with a commitment to positive impact and employee growth | Software Development | 🇨🇦 Kanata | 111 |  |
| 21 | [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 |  |
| 22 | [MIS Electronics Inc.](https://www.tamtam.ai/c/mis-electronics-inc) (miselectronics.com)<br>Electronic manufacturing services company serving industries such as defense, medical, aerospace, and more; focusing on quality, speed, and cost-effectiveness for customer success | Appliances, Electrical, and Electronics Manufacturing | 🇨🇦 Richmond Hill | 43 | 1999 |
| 23 | [LightMachinery](https://www.tamtam.ai/c/lightmachinery) (lightmachinery.com)<br>Specializing in high-quality lasers, optical components, and process machinery, the company produces tight tolerance components and cutting-edge equipment | Machinery Manufacturing | 🇨🇦 Ottawa | 41 | 2002 |
| 24 | [RMF Design and Manufacturing Inc.](https://www.tamtam.ai/c/rmf-design-and-manufacturing-inc) (rmfdesign.com)<br>Provider of electronic design and manufacturing services for clients in Canada and the United States Specializing in engineering, programming, prototyping, and turnkey manufacturing | Appliances, Electrical, and Electronics Manufacturing | 🇨🇦 Mississauga | 36 | 1983 |
| 25 | [Avnan](https://www.tamtam.ai/c/avnan) (avnan.com)<br>An electronics design and manufacturing company offering supply chain solutions to OEMs, specializing in product life cycle management with global presence | Appliances, Electrical, and Electronics Manufacturing | 🇨🇦 Mississauga | 36 | 1995 |
| 26 | [STIM Canada Inc.](https://www.tamtam.ai/c/stim-canada-inc) (stimcanada.com)<br>A well-established Electronics Manufacturing Services company partnering with top OEMs, offering flexible solutions and solid partnerships since 1982 | Appliances, Electrical, and Electronics Manufacturing | 🇨🇦 Toronto | 21 | 1982 |
| 27 | [BMV Optical Technologies Inc.](https://www.tamtam.ai/c/bmv-optical-technologies-inc) (bmvoptical.com)<br>Experienced manufacturer of custom optical components and systems with capabilities from raw material to final product, offering rapid turnaround and high-quality solutions | Industrial Machinery Manufacturing | 🇨🇦 Ottawa | 14 | 2001 |
| 28 | [Circuit Centre Inc](https://www.tamtam.ai/c/circuit-centre-inc) (circuitcentre.com)<br>Advanced electronics design, manufacturing, and test services company with a focus on long-term client relationships, quality excellence, and cutting-edge technology | Appliances, Electrical, and Electronics Manufacturing | 🇨🇦 Markham | 10 | 1996 |
| 29 | [Universal Quantum Devices Inc. (UQDevices)](https://www.tamtam.ai/c/universal-quantum-devices-inc-uqdevices) (uqdevices.com)<br>Specializing in quantum technologies, this company based in Waterloo, Ontario offers solutions for quantum cryptography, photon correlation experiments, and real-world applications in space | Research Services | 🇨🇦 Waterloo | 3 | 2010 |
| 30 | [Eci Technology Group Inc](https://www.tamtam.ai/c/eci-technology-group-inc-toronto) (ecitech.com)<br>An electronic manufacturing solution provider offering design, assembly, testing, and full box build services with a focus on trust, integrity, and quality performance | Appliances, Electrical, and Electronics Manufacturing | 🇨🇦 Toronto | 3 |  |
| 31 | [Mektronix Systems Corp](https://www.tamtam.ai/c/mektronix-systems-corp)<br>An electrical/electronic manufacturing company specializing in product development and design for various industries | Appliances, Electrical, and Electronics Manufacturing | 🇨🇦 Vancouver/toronto/montreal | 2 | 1989 |

## 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 11, 2026.

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## The same list elsewhere in Canada

- [Electronics and semiconductor companies in Canada](https://www.tamtam.ai/l/electronics-companies-canada) (63)

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