# 100 leading professional services firms in Canada

Tamtam tracks 481 professional services firms headquartered in Canada. This list ranks the 100 largest by number of employees on LinkedIn, led by Colliers, SNC-Lavalin and Hatch. Their median headcount is 1,227. Half of them were founded in 1975 or later. The most common headquarters are Toronto (40), Montreal (12) and Vancouver (9).

This list features prominent professional services firms across Canada. The companies range from large, established groups like Colliers, which offers real estate and engineering solutions, and SNC-Lavalin, a global engineering and nuclear organization, to specialized firms such as Other.™, an advertising services agency. Other notable companies include RBC Capital Markets, a global investment bank, and KPMG Canada, providing audit, tax, and advisory services.

The firms are diverse in their specializations, covering real estate, civil engineering, investment banking, and financial services. A clear pattern is the concentration of headquarters in major Canadian cities, particularly Toronto and Montreal, reflecting their status as key business hubs.

🇨🇦 Canada · 100 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Colliers](https://www.tamtam.ai/c/colliers) (colliers.com)<br>Offers real estate services, engineering solutions, and investment management, focusing on client success and delivering strong financial returns. | Real Estate | 🇨🇦 Toronto | 29,561 |  |
| 2 | [SNC-Lavalin](https://www.tamtam.ai/c/snc-lavalin) (atkinsrealis.com)<br>Global engineering services and nuclear organization connecting people, data, and technology to transform infrastructure and energy systems worldwide. | Civil Engineering | 🇨🇦 Montreal | 11,913 |  |
| 3 | [Hatch](https://www.tamtam.ai/c/hatch-mississauga) (hatch.com)<br>Global network of professionals dedicated to developing innovative solutions in metals, energy, infrastructure, digital, and investments sectors for lasting success and positive change worldwide | Professional Services | 🇨🇦 Mississauga | 11,326 | 1955 |
| 4 | [RBC Capital Markets](https://www.tamtam.ai/c/rbc-capital-markets) (rbccm.com)<br>Global investment bank providing specialized expertise in capital markets, banking, and finance to corporations, institutional investors, asset managers, and governments across international markets. | Investment Banking | 🇨🇦 Toronto | 11,098 |  |
| 5 | [WSP in Canada](https://www.tamtam.ai/c/wsp-in-canada) (wsp.com)<br>professional services firm unites engineering, advisory, science expertise; shapes communities; advances humanity; delivers projects across sectors globally. | Professional Services | 🇨🇦 Montreal | 10,459 | 1959 |
| 6 | [KPMG Canada](https://www.tamtam.ai/c/kpmg-canada) (kpmg.com)<br>Providing audit, tax, and advisory services to public, private, nonprofit, and public sector organizations across Canada with professionalism. | Financial Services | 🇨🇦 Toronto | 10,017 |  |
| 7 | [MNP](https://www.tamtam.ai/c/mnp) (mnp.ca)<br>A leading national accounting, tax, and business consulting firm in Canada, offering personalized strategies and partner-led engagements to help organizations succeed | Accounting | 🇨🇦 Calgary | 9,798 |  |
| 8 | [Other.™](https://www.tamtam.ai/c/other-toronto) (weareother.ca)<br>Specialized paid media and performance creative agency helping marketers optimize media spend, achieve targets, and outperform competition with proven methodologies and successful campaigns | Advertising Services | 🇨🇦 Toronto | 9,168 | 2015 |
| 9 | [Apex Group Ltd](https://www.tamtam.ai/c/apex-group-ltd) (apexgroup.com)<br>Comprehensive financial services provider offering innovative fund and asset servicing solutions with global expertise and a commitment to sustainable change. | Financial Services | 🇨🇦 Hamilton | 8,794 |  |
| 10 | [Logica](https://www.tamtam.ai/c/logica) (cgi.com)<br>Global provider of IT and business process services, offering consulting, integration, and outsourcing with a team of 69,000 professionals across 40 countries | IT Services and IT Consulting | 🇨🇦 Montreal | 6,113 |  |
| 11 | [PwC Canada](https://www.tamtam.ai/c/pwc-canada) (pwc.com)<br>Delivering audit assurance, risk management, tax, and consulting services to build trust and solve complex business problems through collective industry expertise. | Business Consulting and Services | 🇨🇦 Toronto | 5,523 |  |
| 12 | [BMO Capital Markets](https://www.tamtam.ai/c/bmo-capital-markets) (capitalmarkets.bmo.com)<br>A leading North American financial services provider offering a complete range of investment and corporate banking products to clients worldwide | Investment Banking | 🇨🇦 Toronto | 5,451 |  |
| 13 | [EXP](https://www.tamtam.ai/c/exp) (exp.com)<br>A global firm providing engineering, architecture, design, and consulting services, with a history dating back to 1906 and over 3,000 professionals delivering successful projects worldwide | Civil Engineering | 🇨🇦 Brampton | 4,949 | 1906 |
| 14 | [Avison Young](https://www.tamtam.ai/c/avison-young) (avisonyoung.us)<br>Global real estate advisor creating value through collective intelligence, creativity, and agile thinking, with a focus on making a positive impact on people's lives | Real Estate | 🇨🇦 Toronto | 3,517 |  |
| 15 | [CIMA+](https://www.tamtam.ai/c/cima-laval) (cima.ca)<br>Provides multidisciplinary consulting engineering services across Canada, focusing on excellence, innovation, and sustainable solutions for better living. | Engineering Services | 🇨🇦 Laval | 3,390 | 1990 |
| 16 | [Softchoice](https://www.tamtam.ai/c/softchoice) (softchoice.com)<br>IT solutions provider enabling organizations to be agile and innovative, move to the cloud, create smarter workplaces, and make informed technology decisions for success | IT Services and IT Consulting | 🇨🇦 Toronto | 2,839 | 1989 |
| 17 | [Precision Drilling](https://www.tamtam.ai/c/precision-drilling) (precisiondrilling.com)<br>A leading provider of safe and high-performance services to the oil and gas industry, offering drilling rigs, technology solutions, environmental stewardship, and support services | Oil and Gas | 🇨🇦 Calgary | 2,802 |  |
| 18 | [Livingston International](https://www.tamtam.ai/c/livingston-international) (livingstonintl.com)<br>Providing customs brokerage, trade consulting, global trade management, freight forwarding, and innovative automation technology solutions worldwide for businesses. | International Trade and Development | 🇨🇦 Toronto | 2,735 | 1945 |
| 19 | [LABORATORY](https://www.tamtam.ai/c/laboratory) (wearelaboratory.com)<br>A full-service agency creating innovative marketing solutions without boundaries, collaborating closely with forward-thinking brands to deliver impactful strategies and designs | Advertising Services | 🇨🇦 Toronto | 2,731 | 2016 |
| 20 | [Fasken](https://www.tamtam.ai/c/fasken) (fasken.com)<br>An international law firm with over 950 lawyers and offices on three continents, providing practical legal services for complex business and litigation challenges | Law Practice | 🇨🇦 Toronto | 2,458 |  |
| 21 | [SRK Consulting](https://www.tamtam.ai/c/srk-consulting) (srk.com)<br>An independent international consultancy providing specialized services in geology, mining, environmental, and project evaluation for various clients worldwide | Mining | 🇨🇦 Vancouver | 2,446 | 1974 |
| 22 | [Raymond Chabot Grant Thornton](https://www.tamtam.ai/c/raymond-chabot-grant-thornton) (rcgt.com)<br>A leading accounting firm with over 2,300 professionals offering assurance, taxation, consulting, and business recovery services in Quebec and globally | Professional Services | 🇨🇦 Montreal | 2,426 | 1948 |
| 23 | [Alithya](https://www.tamtam.ai/c/alithya) (alithya.com)<br>A global digital technology services company providing practical IT solutions tailored to complex business challenges, with a focus on strategy and digital transformation | IT Services and IT Consulting | 🇨🇦 Montreal | 2,418 |  |
| 24 | [BBA Consultants](https://www.tamtam.ai/c/bba-consultants) (bbaconsultants.com)<br>Innovative engineering solutions provider assisting industries in transitioning to a sustainable future through sharp business acumen and vast technological curiosity | Professional Services | 🇨🇦 Mont-Saint-Hilaire | 2,381 | 1979 |
| 25 | [Borden Ladner Gervais LLP (BLG)](https://www.tamtam.ai/c/borden-ladner-gervais-llp-blg) (blg.com)<br>A Canadian law firm offering bilingual services in common and civil law, with a national presence and global reach through an international network Contributing to communities through pro bono work and charitable initiatives | Law Practice | 🇨🇦 Toronto | 2,290 | 1823 |
| 26 | [McCarthy Tétrault](https://www.tamtam.ai/c/mccarthy-tetrault) (mccarthy.ca)<br>Canadian-based law firm offering a wide range of legal services to Canadian and international clients, with expertise in business law, litigation, tax, real estate, and labor law | Law Practice | 🇨🇦 Toronto | 2,088 | 1855 |
| 27 | [Klick](https://www.tamtam.ai/c/klick) (klick.com)<br>An independent commercialization partner for life sciences brands, focused on developing, launching, and supporting brands to maximize market potential globally | Advertising Services | 🇨🇦 Toronto | 2,006 | 1997 |
| 28 | [Englobe](https://www.tamtam.ai/c/englobe) (englobecorp.com)<br>A leader in engineering, geosciences, environmental management, and quality services with 50+ years of experience, focused on employee safety and sustainability | Engineering Services | 🇨🇦 Quebec City | 1,980 | 1961 |
| 29 | [OSF Digital](https://www.tamtam.ai/c/osf-digital) (osf.digital)<br>Top global company offering data-driven AI-powered Salesforce multi-cloud solutions, enterprise CRM, CMS, OMS, connected commerce, online shop management, and cloud application development for businesses. | IT Services and IT Consulting | 🇨🇦 Quebec City | 1,867 |  |
| 30 | [Critical Mass](https://www.tamtam.ai/c/critical-mass) (criticalmass.com)<br>Designing brand experiences, full-service digital agency, global presence, working with top brands, data-driven approach, focus on customer experience and innovative technologies | Advertising Services | 🇨🇦 Calgary | 1,810 | 1996 |
| 31 | [WSP \| MMM Group](https://www.tamtam.ai/c/wsp-mmm-group) (wspgroup.ca)<br>A Canadian multinational specializing in engineering consulting, urban planning, environmental remediation, and sustainable transportation solutions with a global presence | Civil Engineering | 🇨🇦 | 1,788 |  |
| 32 | [Converge Technology Solutions Corp.](https://www.tamtam.ai/c/converge-technology-solutions-corp) (pellera.com)<br>A services-led IT & Cloud Solutions provider offering advanced analytics, cybersecurity, cloud platforms, and digital workplace offerings with global support | IT Services and IT Consulting | 🇨🇦 Gatineau | 1,709 |  |
| 33 | [Osler, Hoskin & Harcourt LLP](https://www.tamtam.ai/c/osler-hoskin-and-harcourt-llp) (osler.com)<br>providing business law advice and counsel to Canadian, U.S., and international clients on domestic and cross-border legal issues | Law Practice | 🇨🇦 Toronto | 1,707 | 1862 |
| 34 | [Blake, Cassels & Graydon LLP](https://www.tamtam.ai/c/blake-cassels-and-graydon-llp) (blakes.com)<br>A top Canadian business law firm providing exceptional legal services to leading businesses in Canada and globally, with a focus on client relationships and expertise | Law Practice | 🇨🇦 Toronto | 1,686 | 1856 |
| 35 | [Tundra Technical Solutions](https://www.tamtam.ai/c/tundra-technical-solutions) (tundratechnical.com)<br>Global provider of staffing solutions, focusing on understanding client and candidate needs to deliver top talent for the right role worldwide | Staffing and Recruiting | 🇨🇦 Toronto | 1,679 | 2004 |
| 36 | [SCM Insurance Services](https://www.tamtam.ai/c/scm-insurance-services) (www1.scm.ca)<br>Provider of insurance claims adjusting, risk management, investigative, surveillance, forensic engineering, accounting services with innovative technology, expert staff, solid customer service across Canada and the United States | Insurance | 🇨🇦 Edmonton | 1,604 | 1986 |
| 37 | [Gowling WLG Canada](https://www.tamtam.ai/c/gowling-wlg-canada) (gowlingwlg.com)<br>International legal organization formed through the merger of a Canadian and UK-based law firm, offering specialized legal services across 18 global locations | Law Practice | 🇨🇦 Toronto | 1,572 |  |
| 38 | [Stikeman Elliott LLP](https://www.tamtam.ai/c/stikeman-elliott-llp) (stikeman.com)<br>A global leader in Canadian business law, providing legal services and creative solutions in various practice areas to clients worldwide | Law Practice | 🇨🇦 Toronto | 1,564 | 1952 |
| 39 | [Miller Thomson LLP](https://www.tamtam.ai/c/miller-thomson-llp) (millerthomson.com)<br>National business law firm with 525 lawyers in Canada offering litigation, mergers and acquisitions, corporate finance, tax, real estate, labor & employment services | Law Practice | 🇨🇦 Toronto | 1,415 | 1957 |
| 40 | [Levio](https://www.tamtam.ai/c/levio) (levio.ca)<br>Consulting firm leveraging expert team and new technologies to deliver solutions that enhance client efficiency and profitability. | IT Services and IT Consulting | 🇨🇦 Quebec City | 1,410 | 2014 |
| 41 | [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 |
| 42 | [Kinectrics](https://www.tamtam.ai/c/kinectrics) (kinectrics.com)<br>Integrated lifecycle management services for electric power industry worldwide Testing, inspection, certification, engineering consulting, and maintenance services to ensure safe and efficient utility asset performance | Utilities | 🇨🇦 Toronto | 1,361 | 1912 |
| 43 | [McElhanney](https://www.tamtam.ai/c/mcelhanney) (mcelhanney.com)<br>Employee-owned company providing geomatics, engineering, planning, and environmental services across Western Canada and Florida, with a focus on safety, quality, and client satisfaction | Professional Services | 🇨🇦 Vancouver | 1,335 | 1910 |
| 44 | [IRISNDT](https://www.tamtam.ai/c/irisndt) (irisndt.com)<br>A full-service Nondestructive Testing and Materials Engineering company serving various industries worldwide with a focus on minimizing NDT and operating costs | Industrial Machinery Manufacturing | 🇨🇦 Edmonton | 1,318 | 1953 |
| 45 | [Mallette](https://www.tamtam.ai/c/mallette) (mallette.ca)<br>Provides extensive accounting, advisory, and client-focused services through numerous Quebec offices, supporting local and international business needs. | Financial Services | 🇨🇦 Quebec City | 1,303 | 1941 |
| 46 | [Procom](https://www.tamtam.ai/c/procom) (procomservices.com)<br>A leading staffing and contract workforce provider with 18 offices in North America, offering award-winning services to Fortune 500 clients | IT Services and IT Consulting | 🇨🇦 Toronto | 1,287 | 1978 |
| 47 | [BPA](https://www.tamtam.ai/c/bpa-montreal) (bpa.ca)<br>An engineering firm specializing in mechanical, electrical, structural engineering, building science, and more for commercial, institutional, and industrial markets across Canada | Engineering Services | 🇨🇦 Montreal | 1,269 | 1956 |
| 48 | [Dillon Consulting Limited](https://www.tamtam.ai/c/dillon-consulting-limited) (dillon.ca)<br>A Canadian employee-owned consulting firm specializing in planning, engineering, environmental science, and management, providing innovative solutions for complex projects | Business Consulting and Services | 🇨🇦 Toronto | 1,256 | 1946 |
| 49 | [Kelly Services (Canada), Ltd.](https://www.tamtam.ai/c/kelly-services-canada-ltd) (kellyservices.ca)<br>This company is a global specialty talent solutions provider, connecting job seekers and employers in various fields, embracing nontraditional work arrangements | Staffing and Recruiting | 🇨🇦 Mississauga | 1,247 | 1946 |
| 50 | [CONTAX Inc.](https://www.tamtam.ai/c/contax-inc) (contax.com)<br>Providing SAP system implementation, support, and maintenance services with a focus on quality, reliability, and customer business growth. | IT Services and IT Consulting | 🇨🇦 Toronto | 1,227 | 1991 |
| 51 | [DIALOG](https://www.tamtam.ai/c/dialog-calgary) (dialogdesign.ca)<br>Architects, urban planners, engineers, and landscape architects collaboratively improve communities and the environment through design and multidisciplinary solutions for urban vibrancy, health, and transportation. | Design Services | 🇨🇦 Calgary | 1,224 | 1960 |
| 52 | [Randstad Canada](https://www.tamtam.ai/c/randstad-canada) (randstad.ca)<br>This company is a Canadian leader in recruitment and HR, focusing on delivering HR innovation with a people-first, human approach | Staffing and Recruiting | 🇨🇦 Toronto | 1,203 | 1997 |
| 53 | [COFOMO](https://www.tamtam.ai/c/cofomo) (cofomo.com)<br>Canadian IT and business consulting leader specializing in digital transformation with a team of 3,000 professionals offering innovative solutions nationwide | Business Consulting and Services | 🇨🇦 Montreal | 1,201 | 1995 |
| 54 | [Drake International](https://www.tamtam.ai/c/drake-international) (drakeintl.com)<br>A global leader in flexible and permanent staffing, offering talent management solutions to maximize human capital assets and increase organizational bottom line | Human Resources Services | 🇨🇦 Toronto | 1,189 | 1951 |
| 55 | [Bennett Jones](https://www.tamtam.ai/c/bennett-jones) (bennettjones.com)<br>An internationally recognized Canadian law firm with over 500 lawyers, specializing in various sectors such as mergers and acquisitions, energy, finance, litigation, and public policy | Law Practice | 🇨🇦 Calgary | 1,184 | 1922 |
| 56 | [WSI World](https://www.tamtam.ai/c/wsi-world) (wsiworld.com)<br>Global leader in digital marketing, providing tailored solutions to unlock potential for brands across various industries with over 25 years of experience | Advertising Services | 🇨🇦 Etobicoke | 1,174 | 1995 |
| 57 | [Torys LLP](https://www.tamtam.ai/c/torys-llp) (torys.com)<br>Providing superior counsel and client service, our cross-border team offers innovative solutions for clients' toughest problems with regional expertise | Law Practice | 🇨🇦 Toronto | 1,106 | 1941 |
| 58 | [Bill Gosling Outsourcing India](https://www.tamtam.ai/c/bill-gosling-outsourcing-india) (billgosling.com)<br>Outsourcing solutions provider with 65+ years of experience in contact center industry, dedicated to helping brands reach their customers effectively and efficiently | Outsourcing and Offshoring Consulting | 🇨🇦 Barrie | 1,101 | 2010 |
| 59 | [Associated Engineering](https://www.tamtam.ai/c/associated-engineering) (ae.ca)<br>A Canadian company specializing in building sustainable communities, providing engineering and environmental consulting services, and offering creative solutions for clients worldwide | Civil Engineering | 🇨🇦 Edmonton | 1,101 | 1946 |
| 60 | [AGAT Laboratories](https://www.tamtam.ai/c/agat-laboratories) (agatlabs.com)<br>Specialized Canadian provider of analytical solutions globally, offering accurate and timely services in various industries including environmental, mining, petroleum, and food testing | Professional Services | 🇨🇦 Calgary | 1,034 | 1979 |
| 61 | [Bantrel Co.](https://www.tamtam.ai/c/bantrel-co) (bantrel.com)<br>Established in 1983, the company specializes in EPC/CM services for energy, mining & infrastructure projects, focusing on safety, quality, & efficiency Headquarters in Calgary, with operations across Canada and globally | Engineering Services | 🇨🇦 Calgary | 1,029 | 1983 |
| 62 | [AVENIR GLOBAL](https://www.tamtam.ai/c/avenir-global) (avenir.global)<br>A global holding and management group with specialized communication agencies in Canada, the US, Europe, and the Middle East | Public Relations and Communications Services | 🇨🇦 Montreal | 1,020 | 1976 |
| 63 | [Baker Tilly Canada](https://www.tamtam.ai/c/baker-tilly-canada) (bakertilly.ca)<br>National association of chartered professional accounting firms providing audit, tax, and advisory solutions for diverse industries through an extensive independent member network. | Accounting | 🇨🇦 Waterloo | 1,004 |  |
| 64 | [Canaccord Genuity Group Inc.](https://www.tamtam.ai/c/canaccord-genuity-group-inc) (canaccordgenuity.com)<br>A leading independent financial services firm offering wealth management and capital markets services globally to individual, institutional, and corporate clients | Financial Services | 🇨🇦 Toronto | 987 | 1950 |
| 65 | [Brock Solutions](https://www.tamtam.ai/c/brock-solutions) (brocksolutions.com)<br>Global industrial automation and professional services provider specializing in Manufacturing, Transportation, and Utilities with expertise in engineering software and solutions | Automation Machinery Manufacturing | 🇨🇦 Kitchener | 976 | 1992 |
| 66 | [NORR](https://www.tamtam.ai/c/norr) (norr.com)<br>Employee-owned A&E firm with 800 professionals in various sectors across multiple countries, focusing on purpose-driven design for sustainable and inclusive spaces | Architecture and Planning | 🇨🇦 Toronto | 947 | 1938 |
| 67 | [McMillan LLP](https://www.tamtam.ai/c/mcmillan-llp) (mcmillan.ca)<br>A national business law firm in Canada specializing in transportation, technology, infrastructure, natural resources, energy, cross-border transactions, private equity, real estate, and regulatory disputes | Law Practice | 🇨🇦 Toronto | 935 | 1903 |
| 68 | [Cementation Americas](https://www.tamtam.ai/c/cementation-americas) (cementation.com)<br>Global mining services provider focused on underground mine contracting, engineering, and material handling solutions, committed to safety, value, and client satisfaction | Mining | 🇨🇦 North Bay | 933 | 1998 |
| 69 | [Richter](https://www.tamtam.ai/c/richter) (richter.ca)<br>Business \| Family Office providing strategic advice on business and family matters, guiding successful entrepreneurs to shape their legacy across generations | Professional Services | 🇨🇦 Montreal | 922 | 1926 |
| 70 | [RSM Canada](https://www.tamtam.ai/c/rsm-canada) (rsmcanada.com)<br>A leading global provider of assurance, tax, and consulting services with an integrated team of industry-focused experts across Canada and beyond | Accounting | 🇨🇦 Toronto | 898 |  |
| 71 | [Charter](https://www.tamtam.ai/c/charter) (charter.ca)<br>An award-winning provider of innovative IT solutions, managed services, project delivery, and consulting services focused on digital transformation and business optimization | IT Services and IT Consulting | 🇨🇦 Victoria | 898 | 1997 |
| 72 | [Cassels Brock & Blackwell LLP](https://www.tamtam.ai/c/cassels-brock-and-blackwell-llp) (cassels.com)<br>A leading Canadian law practice specializing in business law, serving clients ranging from start-ups to multinational corporations with practical and flexible legal solutions | Law Practice | 🇨🇦 Toronto | 874 | 1888 |
| 73 | [Pinchin in Canada](https://www.tamtam.ai/c/pinchin-in-canada) (pinchin.com)<br>An environmental consulting firm offering services in engineering, building science, health & safety, asbestos abatement, emissions reduction, and environmental compliance across North America | Environmental Services | 🇨🇦 Mississauga | 871 |  |
| 74 | [Klohn Crippen Berger](https://www.tamtam.ai/c/klohn-crippen-berger) (klohn.com)<br>Award-winning engineering and consulting firm providing technical solutions for mining, energy, transportation, and infrastructure projects with a strong international reputation and commitment to sustainability | Professional Services | 🇨🇦 Vancouver | 869 | 1950 |
| 75 | [Urban Systems Ltd.](https://www.tamtam.ai/c/urban-systems-ltd) (urbansystems.ca)<br>UrbanSystems is an employee-owned consulting firm dedicated to building prosperous, sustainable, and healthy communities through collaboration and outstanding talent | Civil Engineering | 🇨🇦 Kamloops | 843 | 1975 |
| 76 | [Marsh Canada](https://www.tamtam.ai/c/marsh-canada) (corporate.marsh.com)<br>Global leader in insurance brokering and risk advisory services, providing data-driven solutions to commercial and individual clients worldwide through multiple market-leading businesses | Insurance | 🇨🇦 Toronto | 839 | 1914 |
| 77 | [BGC Engineering Inc.](https://www.tamtam.ai/c/bgc-engineering-inc) (bgcengineering.ca)<br>An international consulting firm specializing in applied earth sciences, offering a wide range of services to address complex engineering and geoscience challenges | Civil Engineering | 🇨🇦 Vancouver | 834 | 1990 |
| 78 | [KGS Group](https://www.tamtam.ai/c/kgs-group) (kgsgroup.com)<br>A multidisciplinary engineering consulting firm in North America, dedicated to excellence in engineering services for various markets with an employee-owned ethos | Engineering Services | 🇨🇦 Winnipeg | 820 | 1986 |
| 79 | [Onex](https://www.tamtam.ai/c/onex) (onex.com)<br>Investor and asset manager with $496 billion assets under management, specializing in private equity and credit investments for global clients since 1984 | Investment Management | 🇨🇦 Toronto | 808 | 1984 |
| 80 | [Davies Ward Phillips & Vineberg LLP](https://www.tamtam.ai/c/davies-ward-phillips-and-vineberg-llp) (dwpv.com)<br>A leading Canadian business law firm specializing in high-stakes matters, providing clarity, speed, and effective solutions for complex deals and cases Offices in Toronto, Montréal, and New York | Law Practice | 🇨🇦 Toronto | 807 |  |
| 81 | [Norda Stelo](https://www.tamtam.ai/c/norda-stelo) (norda.com)<br>Canadian engineering firm specializing in integrated projects in transportation and various industries, committed to quality, innovation, value creation, and sustainability | Engineering Services | 🇨🇦 Quebec City | 805 | 1963 |
| 82 | [Stantec au Québec](https://www.tamtam.ai/c/stantec-au-quebec) (stantec.com)<br>Global leader in engineering and sustainable development, with expertise in various sectors, providing services from concept to completion with innovation and client needs in mind | Business Consulting and Services | 🇨🇦 Montreal | 801 | 1954 |
| 83 | [BCF](https://www.tamtam.ai/c/bcf) (bcf.ca)<br>Leading team of over 500 professionals providing innovative solutions for businesses in Quebec and beyond, recognized as Canada's Best Managed for 12 years | Law Practice | 🇨🇦 Montreal | 761 | 1995 |
| 84 | [RAM](https://www.tamtam.ai/c/ram-vancouver) (ramconsulting.com)<br>Full-service project delivery focusing on managing Canada's largest infrastructure projects, offering engineering, management, quality, safety services, and Indigenous partnerships for sustainable development | Business Consulting and Services | 🇨🇦 Vancouver | 756 | 2007 |
| 85 | [RJC Engineers](https://www.tamtam.ai/c/rjc-engineers) (rjc.ca)<br>A national company specializing in structural engineering, restoration, building science, glass design, and energy modeling, with a focus on sustainability and employee ownership | Civil Engineering | 🇨🇦 Vancouver | 753 | 1948 |
| 86 | [LGS, an IBM Company](https://www.tamtam.ai/c/lgs-an-ibm-company) (lgs.com)<br>Global company affiliated with IBM offering IT solutions, services, and resources including cloud computing, AI, and application services, with a focus on innovation and excellence in Quebec | IT Services and IT Consulting | 🇨🇦 Quebec City | 752 | 1979 |
| 87 | [Colliers Project Leaders \| Canada](https://www.tamtam.ai/c/colliers-project-leaders-canada) (colliersprojectleaders.com)<br>Project management partner offering total support for client success Dedicated project managers lead construction projects from start to finish, with career growth opportunities | Professional Services | 🇨🇦 Ottawa | 747 | 1989 |
| 88 | [Allnorth Consultants Limited](https://www.tamtam.ai/c/allnorth-consultants-limited) (allnorth.com)<br>A multi-disciplinary engineering company providing project delivery and construction services in various sectors, focusing on collaborative and practical solutions | Engineering Services | 🇨🇦 Vancouver | 740 | 1995 |
| 89 | [Grant Thornton LLP (Canada)](https://www.tamtam.ai/c/grant-thornton-llp-canada) (doanegrantthornton.ca)<br>A leading Canadian accounting and advisory firm, helping organizations unlock their potential with audit, advisory, and tax services Recognized for workplace excellence | Accounting | 🇨🇦 Toronto | 725 |  |
| 90 | [RWDI](https://www.tamtam.ai/c/rwdi) (rwdi.com)<br>The company specializes in innovative solutions for the built environment, focusing on building performance, climate engineering, and environmental engineering to create sustainable and resilient spaces | Civil Engineering | 🇨🇦 Guelph | 723 | 1972 |
| 91 | [Cowater International](https://www.tamtam.ai/c/cowater-international) (cowater.com)<br>Global leader in management consulting focusing on developing and emerging economies Specializing in sustainable solutions for governments, organizations, and communities to create lasting impacts | International Trade and Development | 🇨🇦 Ottawa | 712 | 1984 |
| 92 | [APPLY](https://www.tamtam.ai/c/apply) (applydigital.com)<br>Specializing in digital solutions, we help global brands enhance user experience and gain a competitive edge through expertly executed products and platforms | Business Consulting and Services | 🇨🇦 Vancouver | 708 | 2016 |
| 93 | [MCIS Language Solutions](https://www.tamtam.ai/c/mcis-language-solutions) (mcislanguages.com)<br>A not-for-profit social enterprise offering 24/7 solutions in over 350 languages, with a focus on financial sustainability, human rights, and diversity | Translation and Localization | 🇨🇦 Toronto | 693 | 1989 |
| 94 | [CBRE Canada](https://www.tamtam.ai/c/cbre-canada) (cbre.ca)<br>Real estate firm offering comprehensive solutions globally, serving investors and tenants through a wide range of services including property management, investment management, and strategic consulting | Leasing Non-residential Real Estate | 🇨🇦 Toronto | 679 | 1983 |
| 95 | [ISL](https://www.tamtam.ai/c/isl-edmonton) (islengineering.com)<br>ISL provides integrated community infrastructure services including planning, design, and construction management by assembling specialized teams for each project | Civil Engineering | 🇨🇦 Edmonton | 676 | 1987 |
| 96 | [Alimentiv](https://www.tamtam.ai/c/alimentiv) (alimentiv.com)<br>A company specializing in clinical trials, medical imaging, and precision medicine for gastrointestinal disorders, with a history dating back to 1986 | Pharmaceutical Manufacturing | 🇨🇦 London | 663 | 1986 |
| 97 | [TEEMA](https://www.tamtam.ai/c/teema) (teemagroup.com)<br>Revolutionizing staffing industry since 2008, TEEMA offers tailored solutions in IT, Engineering, and Healthcare sectors with exceptional service and innovative approach #LiveBetter | Staffing and Recruiting | 🇨🇦 Vancouver | 660 | 2008 |
| 98 | [Smith + Andersen](https://www.tamtam.ai/c/smith-andersen) (smithandandersen.com)<br>One of Canada's leading integrated engineering firms, specializing in creative, quality designs with a commitment to sustainability and innovation | Design Services | 🇨🇦 Toronto | 659 | 1965 |
| 99 | [SNC-Lavalin Rail & Transit (formerly Interfleet)](https://www.tamtam.ai/c/snc-lavalin-rail-and-transit-formerly-interfleet) (snclavalin.com)<br>Global engineering and construction group providing industry-leading services in infrastructure, oil and gas, mining, power, and rail and transit systems | Truck Transportation | 🇨🇦 Montreal | 659 | 1911 |
| 100 | [Everest Clinical Research](https://www.tamtam.ai/c/everest-clinical-research) (everestclinical.com)<br>A full-service contract research organization providing clinical research services to pharmaceutical, biotechnology, and medical device industries with a focus on quality and flexibility | Biotechnology Research | 🇨🇦 Toronto | 646 | 2004 |

## 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.

## More company lists in Canada

- [The largest companies in Canada](https://www.tamtam.ai/l/largest-companies-canada) (11,083)
- [Multinational companies in Canada](https://www.tamtam.ai/l/multinational-companies-canada) (1,934)
- [Manufacturers in Canada](https://www.tamtam.ai/l/manufacturers-canada) (946)
- [Retail chains in Canada](https://www.tamtam.ai/l/retail-chains-canada) (851)
- [Critical infrastructure operators in Canada](https://www.tamtam.ai/l/critical-infrastructure-operators-canada) (767)
- [Public sector organisations in Canada](https://www.tamtam.ai/l/public-sector-organisations-canada) (699)
- [Financial services firms in Canada](https://www.tamtam.ai/l/financial-services-firms-canada) (687)
- [Companies with in-house R&D in Canada](https://www.tamtam.ai/l/r-and-d-companies-canada) (678)
- [Logistics companies in Canada](https://www.tamtam.ai/l/logistics-companies-canada) (593)
- [Truck Transportation companies in Canada](https://www.tamtam.ai/l/truck-transportation-companies-canada) (581)
- [SaaS companies in Canada](https://www.tamtam.ai/l/saas-companies-canada) (543)
- [Hardware manufacturers in Canada](https://www.tamtam.ai/l/hardware-companies-canada) (502)
- [Energy companies in Canada](https://www.tamtam.ai/l/energy-companies-canada) (497)
- [Software Development companies in Canada](https://www.tamtam.ai/l/software-development-companies-canada) (484)
- [IT Services and IT Consulting companies in Canada](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-canada) (477)
- [Transportation, Logistics, Supply Chain and Storage companies in Canada](https://www.tamtam.ai/l/transportation-logistics-supply-chain-and-storage-companies-canada) (464)
- [Distributors and wholesalers in Canada](https://www.tamtam.ai/l/distributors-and-wholesalers-canada) (452)
- [Financial Services companies in Canada](https://www.tamtam.ai/l/financial-services-companies-canada) (432)
- [Healthcare providers in Canada](https://www.tamtam.ai/l/healthcare-providers-canada) (416)
- [Construction companies in Canada](https://www.tamtam.ai/l/construction-companies-canada) (391)
- [Oil and Gas companies in Canada](https://www.tamtam.ai/l/oil-and-gas-companies-canada) (380)
- [Companies with a mobile app in Canada](https://www.tamtam.ai/l/companies-with-mobile-app-canada) (367)
- [Retail companies in Canada](https://www.tamtam.ai/l/retail-companies-canada) (358)
- [Hospitals and Health Care companies in Canada](https://www.tamtam.ai/l/hospitals-and-health-care-companies-canada) (357)

## The same list elsewhere in Canada

- [Professional services firms in Ontario](https://www.tamtam.ai/l/professional-services-firms-ontario) (211)
- [Professional services firms in the province of Quebec](https://www.tamtam.ai/l/professional-services-firms-province-of-quebec) (103)
- [Professional services firms in Alberta](https://www.tamtam.ai/l/professional-services-firms-alberta) (81)
- [Professional services firms in British Columbia](https://www.tamtam.ai/l/professional-services-firms-british-columbia) (59)
- [Professional services firms in Toronto](https://www.tamtam.ai/l/professional-services-firms-toronto) (117)
- [Professional services firms in Montreal](https://www.tamtam.ai/l/professional-services-firms-montreal) (65)
- [Professional services firms in Calgary](https://www.tamtam.ai/l/professional-services-firms-calgary) (55)
- [Professional services firms in Vancouver](https://www.tamtam.ai/l/professional-services-firms-vancouver) (34)

---

Source: https://www.tamtam.ai/l/professional-services-firms-canada