| # | Company | Employees |
|---|---|---|
| 1 |
OpenTextopentext.com
It specializes in Information Management, assisting businesses of all sizes in securely capturing, governing, and exchanging information globally. |
22,990 |
| 2 |
University of Waterloouwaterloo.ca
Leader in innovation driving economic and social prosperity through talent pipeline, groundbreaking research, entrepreneurial culture, and industry collaboration for student success |
11,390 |
| 3 |
Definitydefinityfinancial.com
Parent company of several established Canadian property and casualty insurance brands focused on improving insurance for customers and communities. |
4,398 |
| 4 |
Wilfrid Laurier Universitywlu.ca
Canadian university focusing on teaching, research, and student satisfaction with programs in arts, business, science, social work, and education. |
4,060 |
| 5 |
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 |
| 6 |
Descartes Systems Groupdescartes.com
Software-as-a-service solutions enhancing productivity, security, and sustainability for logistics businesses through routing, tracking, shipment planning, and customs compliance. |
1,688 |
| 7 |
Equitableequitable.ca
Offering individual insurance, savings, retirement, and group benefits through independent advisors, focusing on personalized service and policyholder ownership. |
1,504 |
| 8 |
Economical Insuranceeconomical.com
Provides insurance solutions for homes, vehicles, farms, and commercial operations with a focus on customer care and innovation. |
1,391 |
| 9 |
CarePartnerscarepartners.ca
Providing compassionate home and community health care services with innovative programs addressing evolving needs of patients and caregivers. |
1,367 |
| 10 |
OTIP (Ontario Teachers Insurance Plan)otip.com
A not-for-profit insurance advocate serving educators and union organizations, providing personalized insurance benefits and supporting communities through charitable programs |
1,063 |
| 11 |
Baker Tilly Canadabakertilly.ca
National association of chartered professional accounting firms providing audit, tax, and advisory solutions for diverse industries through an extensive independent member network. |
1,004 |
| 12 |
Christian Horizonskaris.org
Non-profit organization supporting individuals with disabilities in Canada and around the world by addressing their physical, emotional, social, and spiritual needs |
923 |
| 13 |
Teledyne DALSAteledynedalsa.com
Specialized in high-performance image sensing, semiconductor fabrication, and 3D geospatial systems with global R&D and support locations. |
863 |
| 14 |
Shad Canadashad.ca
The premier live-in summer enrichment program in Canada for high school students, focusing on STEAM and entrepreneurship, with a vast alumni network |
789 |
| 15 |
City of Waterloowaterloo.ca
Provides diverse municipal jobs and services, supports employee development, promotes safety, diversity, and community involvement for residents. |
754 |
| 16 |
Karis Disability Serviceskaris.org
A non-profit charitable organization in Ontario and Saskatchewan providing disability services and support |
641 |
| 17 |
eSentireesentire.com
Managed detection and response services protecting organizations worldwide from cyber threats using machine learning, threat hunting, and expert security operations. |
580 |
| 18 |
Eastnetseastnets.com
It specializes in compliance, payment protection, and anti-fraud technologies, ensuring safety and security from financial crime for four decades. |
520 |
| 19 |
Conestoga-Rovers & Associates (CRA), A GHD Companyghd.com
A global leader in engineering, environmental consulting, and construction services created through a merger in July 2014 Visit website for more information |
473 |
| 20 | 447 | |
| 21 |
peopleCare Communitiespeoplecare.ca
A leading operator of senior living communities in southwestern Ontario, focusing on creating vibrant care environments with innovative programs and services |
377 |
| 22 |
EasyLink Services - now a part of OpenTexteasylink.com
It offers cloud-based messaging and transaction services, helping organizations reduce costs and improve communication efficiency through various solutions. |
352 |
| 23 |
MEDA (Mennonite Economic Development Associates)meda.org
An international organization helping entrepreneurs in developing regions start or grow businesses through financial services, technology, training, market access, and equity investment |
344 |
| 24 | 344 | |
| 25 |
KidsAbility Centre for Child Developmentkidsability.ca
A charitable organization supporting children and youth in achieving developmental milestones through early, family-centric services, regardless of diagnosis |
284 |
| 26 |
TextNowtextnow.com
This company aims to facilitate communication by offering free phone services with a team of curious and innovative individuals leading the way |
239 |
| 27 |
NDI (Northern Digital Inc.)ndigital.com
Global leader in optical and electromagnetic navigation technology for medical devices, offering accurate instrument tracking in various applications for improved workflow and procedure efficacy |
229 |
| 28 |
University of Waterloo Formula Electricuwfsae.ca
A team of University of Waterloo students design and compete with Formula SAE electric race cars against universities worldwide |
196 |
| 29 |
Orbit Insurance Servicesorbitinsuranceservices.ca
A nationally licensed brokerage specializing in custom-tailored group insurance programs with a focus on exceptional service and employee well-being |
184 |
| 30 |
Broil Kingbroilking.com
Leading global manufacturer of high-performance gas barbecue grills, designed and assembled in North America, sold in over 40 countries |
180 |
| 31 |
UA Local 527ua527.com
This company represents piping professionals skilled in fabrication, installation, maintenance, and servicing of various piping services in the industry |
174 |
| 32 |
Institute for Quantum Computinguwaterloo.ca
A leading research center focused on advancing quantum information science and technology through interdisciplinary collaboration at a global level |
174 |
| 33 |
Centre for International Governance Innovation (CIGI)cigionline.org
Independent think tank focused on innovative policy making at the intersection of technology and international governance to improve lives globally. |
168 |
| 34 |
Renison University Collegeuwaterloo.ca
An affiliated university college offering academic programs that count towards a University of Waterloo degree, focusing on social sciences, language, culture, and community engagement |
166 |
| 35 |
University of Waterloo Formula Electricuwfsae.ca
A team of University of Waterloo students design and compete with electric race cars in the Formula SAE competition on a global scale |
165 |
| 36 |
University of Waterloo - School of Accounting and Financeuwaterloo.ca
A leading school providing interdisciplinary education, impactful research, and innovative programs in accounting and finance to prepare future financial professionals |
165 |
| 37 |
Serenia Life Financialserenialife.ca
This company offers life insurance, investment solutions, and member benefits, focusing on a human-centric approach to financial services |
155 |
| 38 |
Virtek Vision International Inc.virtekvision.com
Develops laser-based projection and AI inspection manufacturing technologies for diverse industries, providing precision, accuracy, and reliability to global companies since 1986. |
127 |
| 39 | 116 | |
| 40 |
Mappedinmappedin.com
Global leader in indoor mapping and spatial data management Specializing in creating indoor mapping experiences for various spaces using innovative solutions |
105 |
| 41 |
Riverside Millwork Groupriversidemillwork.ca
Supplying builders and homeowners with a range of finished products including trim, interior doors, custom wood front entry doors, closets, hardware, and custom millwork solutions since 2005 |
72 |
| 42 |
VueReal Inc.vuereal.com
Innovative global company revolutionizing micro-semiconductor device industry with eco-friendly MicroSolid Printingβ’ technology for high-performance microLED displays in various applications |
72 |
| 43 |
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 |
| 44 |
BusPlannerbusplanner.com
This company provides route planning and student transportation management products and services for pupil transportation professionals, including optimization tools and IT services |
53 |
| 45 | 45 | |
| 46 |
DataCitydatacity.ca
A privately-held company providing mission critical IT/datacenter services for corporate institutions, offering fully managed IT support for medium to large/enterprise companies |
39 |
| 47 |
DigitalEddigitaled.com
Innovative teaching and learning solution with engaging STEM content, sophisticated algorithms, rich feedback, advanced automation, fostering successful student outcomes |
31 |
| 48 |
Descartes Peoplevoxpeoplevox.com
provides warehouse management system enabling e-commerce brands to control fulfillment processes efficiently and scale operations with 24/7 support |
30 |
| 49 |
Brightpath Capitalbrightpathcapital.ca
Private alternative income investment fund specializing in Canadian mortgages, offering diversification, higher yields, and low risk for investors Simplifying mortgage investing through pooled funds management |
26 |
| 50 |
GeoMategeomate.ai
Transforms real-world imagery and spatial data into structured, machine-readable environments for mobility, simulation, infrastructure, and smart city applications using AI. |
21 |
| 51 |
Descartes MacroPointβ’macropoint.com
A multimodal freight visibility platform providing real-time tracking and predictive analytics for shippers, brokers, and 3PLs, connecting to thousands of carriers and devices |
20 |
| 52 |
idloomidloom.com
It is an event management platform that optimizes planning, registration, ticketing, analytics, and integrates with existing technologies for various events. |
19 |
| 53 |
Validus Research Inc.renre.com
A global reinsurance company acquired Validus Re from AIG, expanding its capabilities and strengthening its position in the industry |
19 |
| 54 |
Rellman Foodsrellmanfoods.com
Supplier of high-quality beef from South America and other origins, serving distributors and restaurant chains across Europe and Asia. |
14 |
| 55 |
SmartLinessmartlines.ca
This company helps sports fans become smart sports bettors by teaching them basics of betting, comparing odds, offering a betting simulator for practice |
14 |
| 56 |
Frost Wealth Managementfrostwealthmanagement.com
A leading Canadian financial advisory network offering investment and wealth management services to individuals, families, corporations, and foundations |
13 |
| 57 |
Runners'β Choice Waterloorunnerschoicewat.on.ca
Specializing in running, walking, and triathlon gear, this independent store offers footwear, apparel, and accessories with a knowledgeable staff |
12 |
| 58 |
Megawiremegawire.com
Industry-leading provider of managed IT services in Southern Ontario, offering customized solutions for businesses of all sizes with a comprehensive background in networking, storage, and virtualization |
10 |
| 59 |
Sentry Group | Wealth Partnerssentrygroup.ca
Wealth management firm providing comprehensive, dynamic financial planning for individuals and businesses, focusing on growth, security, and transparent, holistic solutions |
9 |
| 60 |
YOURIKA AIyourika.ai
Leading AI research and development company, using AI for good to empower impact markets through innovative solutions and AI-enabled products like Smart'n and NurseGPT |
9 |
| 61 |
DotsLivedotslive.com
An open innovation and Generative AI community for building, exploring, and learning new technologies and solutions |
7 |
| 62 |
PG Design Studio Incpgdstudio.com
Innovative construction company focused on strong project concepts, collaborative integrated project delivery, and client-centric design solutions Join our team today! |
6 |
| 63 |
Volta Techniquevoltatechnique.com
Specializing in clean energy storage and management technology, the company focuses on innovative solutions for sustainable energy needs |
4 |
| 64 |
Universal Quantum Devices Inc. (UQDevices)uqdevices.com
Specializing in quantum technologies, this company based in Waterloo, Ontario offers solutions for quantum cryptography, photon correlation experiments, and real-world applications in space |
3 |
| 65 |
Grand Porter Logisticsgrandporter.com
A comprehensive logistics company offering various shipping options, including ground, rail, ocean, air, specialty transport, and warehousing services Providing top-notch service |
3 |
| 66 |
NanoRial Technologies Ltdnanorial.com
Specializing in advanced materials, NanoRial Technologies enables superior properties in materials through its proprietary mixing process with nanotubes, transforming customer challenges into solutions |
2 |
| 67 |
KIS Toolskistools.com
An engineering and manufacturing company that specializes in bringing ideas to life with in-house machining, fabrication, and expert engineering services |
1 |
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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 Oct 9, 2026.
The same list elsewhere in Canada
- The largest companies in Canada 9,391
- The largest companies in Toronto 1,663
- The largest companies in Montreal 857
- The largest companies in Calgary 601
- The largest companies in Vancouver 511
- The largest companies in Mississauga 438
- The largest companies in Ottawa 314
- The largest companies in Edmonton 226
- The largest companies in Quebec City 212
- The largest companies in Winnipeg 174
- The largest companies in Halifax 64