# The 50 largest chemical companies in Ontario

Tamtam tracks 60 chemical companies headquartered in Ontario. This list ranks the 50 largest by number of employees on LinkedIn, led by ArcelorMittal Dofasco, Shawcor and IPEX by Aliaxis. Their median headcount is 268. Half of them were founded in 1989 or later. The most common headquarters are Toronto (18), Mississauga (3) and Vaughan (3).

This selection of large companies in Ontario's chemical sector primarily comprises established firms in manufacturing and wholesale building materials, alongside significant players in mining and motor vehicle manufacturing. ArcelorMittal Dofasco, with 3136 employees, produces sustainable steel products, while Shawcor provides solutions in the energy industry. IPEX by Aliaxis focuses on building materials, and Petro-Canada Lubricants supplies high-performance lubricants globally.

A notable characteristic among these companies is the concentration of headquarters in Toronto, indicating a central hub for industrial and manufacturing operations within the province. Other prominent companies include Plasman, a global leader in automotive components, and IKO North America, which manufactures roofing and waterproofing products.

🇨🇦 Ontario · 50 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [ArcelorMittal Dofasco](https://www.tamtam.ai/c/arcelormittal-dofasco) (dofasco.arcelormittal.com)<br>Leading manufacturer in North America's supply chain, producing sustainable steel products for automotive, energy, packaging, and construction industries, prioritizing employees and community engagement | Mining | 🇨🇦 Hamilton | 3,136 |  |
| 2 | [Shawcor](https://www.tamtam.ai/c/shawcor) (tenaris.com)<br>A provider of solutions in the energy industry, recently acquired by Tenaris Visit Tenaris's LinkedIn page for more information | Manufacturing | 🇨🇦 Toronto | 2,342 |  |
| 3 | [IPEX by Aliaxis](https://www.tamtam.ai/c/ipex-by-aliaxis) (ipexna.com)<br>The company prioritizes honesty, fairness, integrity, and customer satisfaction through a customer-first culture, innovation, and long-term thinking in business | Wholesale Building Materials | 🇨🇦 Oakville | 2,085 | 1992 |
| 4 | [Petro-Canada Lubricants](https://www.tamtam.ai/c/petro-canada-lubricants) (petrocanadalubricants.com)<br>The company supplies over 350 high-performance lubricants, fluids, and greases worldwide, catering to a variety of industries and applications to optimize equipment performance and reliability | Oil and Gas | 🇨🇦 Mississauga | 1,799 |  |
| 5 | [Plasman](https://www.tamtam.ai/c/plasman) (plasman.com)<br>Global leader in automotive components, offering single-source solutions for tooling, injection molding, chroming, and assembly with a collaborative mindset and unrivaled dedication | Motor Vehicle Manufacturing | 🇨🇦 Oldcastle | 1,751 | 1978 |
| 6 | [IKO North America](https://www.tamtam.ai/c/iko-north-america) (iko.com)<br>Manufacturing and supplying roofing, waterproofing, and insulation products for residential and commercial markets across North America and Europe. | Wholesale Building Materials | 🇨🇦 Brampton | 1,451 |  |
| 7 | [Chemtrade](https://www.tamtam.ai/c/chemtrade) (chemtradelogistics.com)<br>A publicly traded chemical manufacturing and handling company based in Toronto, operating in North America and Brazil, providing industrial chemicals and services to various industries | Chemical Manufacturing | 🇨🇦 Toronto | 1,242 | 2001 |
| 8 | [Westlake Royal Building Products](https://www.tamtam.ai/c/westlake-royal-building-products) (westlakeroyalbuildingproducts.com)<br>Leading manufacturer and distributor of high-quality exterior building materials for home remodeling, construction, and municipal projects with a focus on innovation and customer relationships | Wholesale Building Materials | 🇨🇦 Woodbridge | 1,109 | 1970 |
| 9 | [Votorantim Cimentos North America (VCNA)](https://www.tamtam.ai/c/votorantim-cimentos-north-america-vcna) (votorantimcimentos.com)<br>Leading provider of cement, concrete and aggregates in North America, part of a global building materials and sustainability solutions provider | Wholesale Building Materials | 🇨🇦 Toronto | 1,044 | 2001 |
| 10 | [Sherritt International Corporation](https://www.tamtam.ai/c/sherritt-international-corporation) (sherritt.com)<br>A global leader in mining nickel and cobalt, creating innovative environmental solutions for oil and mining industries, and a major energy producer | Mining | 🇨🇦 Toronto | 934 |  |
| 11 | [The Woodbridge Group](https://www.tamtam.ai/c/the-woodbridge-group) (woodbridgegroup.com)<br>Innovative urethane and bead foam technologies for automotive and other industries worldwide, providing comfort, safety, acoustics, insulation, and structural solutions Offering diverse services | Motor Vehicle Manufacturing | 🇨🇦 Mississauga | 915 |  |
| 12 | [CCL Industries](https://www.tamtam.ai/c/ccl-industries)<br>Manufacturing labels, specialty media, digital printing software, aluminum aerosol cans, plastic tubes, instructional leaflets, and precision metal components for various markets. | Packaging and Containers Manufacturing | 🇨🇦 Toronto | 835 | 1951 |
| 13 | [Greenfield Global](https://www.tamtam.ai/c/greenfield-global) (greenfield.com)<br>Global supplier of high-purity alcohols, specialty solvents, and renewable fuels, facilitating sustainability through innovative solutions for various industries worldwide | Manufacturing | 🇨🇦 Toronto | 655 | 1989 |
| 14 | [ROCKWOOL North America](https://www.tamtam.ai/c/rockwool-north-america) (rockwool.com)<br>Manufacture and supply sustainable stone wool insulation products for building construction, industrial, and technical applications across North America. | Wholesale Building Materials | 🇨🇦 Milton | 542 | 1937 |
| 15 | [DCL Corporation](https://www.tamtam.ai/c/dcl-corporation) (pigments.com)<br>Global leader in color pigments and dispersions for coatings, plastics, and ink industries, with recent acquisition expanding specialty product offerings | Chemical Manufacturing | 🇨🇦 Toronto | 494 | 1946 |
| 16 | [CRH Canada](https://www.tamtam.ai/c/crh-canada) (crhcanada.com)<br>Leading producer and supplier of construction products and services across Canada, with a focus on innovation, sustainability, and commitment to local communities | Construction | 🇨🇦 Concord | 450 |  |
| 17 | [ERCO Worldwide](https://www.tamtam.ai/c/erco-worldwide) (ercoworldwide.com)<br>A global leader in Chlorine Dioxide technology, ERCO Worldwide focuses on sustainable chemical solutions to enhance lives and the environment | Chemical Manufacturing | 🇨🇦 Mississauga | 443 |  |
| 18 | [Walker Industries](https://www.tamtam.ai/c/walker-industries) (walkerind.com)<br>A family-owned company offering high-performance products and services in industries such as renewable energy, waste disposal, aggregates, and road construction | Wholesale Building Materials | 🇨🇦 Thorold | 422 | 1887 |
| 19 | [Aimia Inc](https://www.tamtam.ai/c/aimia-inc) (aimia.com)<br>Global holding company with investments in public and private companies, operating an investment advisory business with diverse portfolio including loyalty programs and technology companies | Capital Markets | 🇨🇦 Toronto | 372 |  |
| 20 | [CGC Inc.](https://www.tamtam.ai/c/cgc-inc) (usg.com)<br>A Canadian company specializing in marketing, manufacturing, and distributing gypsum wallboard, finishing materials, and suspended acoustical ceilings for various sectors | Wholesale Building Materials | 🇨🇦 Oakville | 338 |  |
| 21 | [CpK Interior Products Inc.](https://www.tamtam.ai/c/cpk-interior-products-inc) (cpkip.com)<br>A global leader in interior products, specializing in precision manufacturing and innovative solutions for original equipment manufacturers and Tier One suppliers | Motor Vehicle Manufacturing | 🇨🇦 Guelph | 334 |  |
| 22 | [Terrapure Environmental](https://www.tamtam.ai/c/terrapure-environmental) (terrapureenv.com)<br>A leading provider of battery recycling solutions that partners with manufacturers to achieve a 99% recycling rate and produce high-quality recycled materials | Environmental Services | 🇨🇦 Burlington | 334 | 2015 |
| 23 | [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 |
| 24 | [McAsphalt Industries Limited](https://www.tamtam.ai/c/mcasphalt-industries-limited) (linktr.ee)<br>A Canadian leader in asphalt production, distribution, services, and technology with a wide range of products and a focus on customer satisfaction | Construction | 🇨🇦 Toronto | 323 | 1970 |
| 25 | [Vision Extrusions Group](https://www.tamtam.ai/c/vision-extrusions-group) (visionextrusionsgroup.com)<br>A leading company in the North American extrusion industry with over 40 years of experience, state-of-the-art facilities, and a focus on innovation and creativity | Plastics Manufacturing | 🇨🇦 Vaughan | 268 | 2008 |
| 26 | [Multy](https://www.tamtam.ai/c/multy) (multyhome.com)<br>Innovating in the circular economy by transforming landfill-bound waste into new, sustainable products for home, garden, and industry | Manufacturing | 🇨🇦 Vaughan | 233 | 1994 |
| 27 | [EHC GLOBAL](https://www.tamtam.ai/c/ehc-global) (drakaehc.com)<br>Leading manufacturer of handrails, rollers, and lift components for vertical transportation systems worldwide, committed to safety, innovation, and sustainability | Industrial Machinery Manufacturing | 🇨🇦 Oshawa | 230 |  |
| 28 | [Toronto Research Chemicals](https://www.tamtam.ai/c/toronto-research-chemicals) (lgcstandards.com)<br>A leading manufacturer and supplier of specialized complex organic small molecules for researchers in the biomedical field worldwide | Chemical Manufacturing | 🇨🇦 Toronto | 193 | 1982 |
| 29 | [Resilient Structures](https://www.tamtam.ai/c/resilient-structures) (resilient-structures.com)<br>Specializing in designing and engineering innovative utility structures, this industry pioneer creates resilient and sustainable solutions to mitigate natural disasters and environmental harm | Utilities | 🇨🇦 Tilbury | 184 | 1995 |
| 30 | [Trusscore](https://www.tamtam.ai/c/trusscore) (trusscore.com)<br>Material science innovator focused on developing sustainable building materials to change building practices and reduce environmental impact Recognized for award-winning products | Wholesale Building Materials | 🇨🇦 Palmerston | 181 | 2013 |
| 31 | [Siltech Corporation](https://www.tamtam.ai/c/siltech-corporation) (siltech.com)<br>Siltech specializes in developing, manufacturing, and marketing a wide range of organo-functional silicone compounds for various industries, focusing on innovation and customer partnerships | Chemical Manufacturing | 🇨🇦 Toronto | 169 | 1989 |
| 32 | [Neo Performance Materials](https://www.tamtam.ai/c/neo-performance-materials) (neomaterials.com)<br>Manufacturer of advanced industrial materials essential for sustainable technologies, including magnetic powders, specialty chemicals, metals, and alloys for various everyday and emerging products | Chemical Manufacturing | 🇨🇦 Toronto | 157 | 2018 |
| 33 | [DYNA](https://www.tamtam.ai/c/dyna) (dyna.ca)<br>A family-run manufacturer of building materials, offering innovative formulations and environmentally-friendly products for hardscape and tile & stone industries worldwide | Manufacturing | 🇨🇦 Vaughan | 148 | 1995 |
| 34 | [Saand Inc.](https://www.tamtam.ai/c/saand-inc) (saand.ca)<br>Premier architectural glass fabricator offering high-quality glass solutions in North America, specializing in commercial IGU's, back painted glass, laminated, heat-treated, and CNC customized products | Glass, Ceramics and Concrete Manufacturing | 🇨🇦 Toronto | 141 | 1989 |
| 35 | [NMC Dynaplas Toronto](https://www.tamtam.ai/c/nmc-dynaplas-toronto) (nationalmolding.com)<br>A leading high-precision injection molder specializing in complex plastic components for automotive suppliers, with expertise in thermoplastics, lightweight solutions, and global supply | Plastics Manufacturing | 🇨🇦 Toronto | 99 | 1985 |
| 36 | [Nudura Insulated Concrete Forms](https://www.tamtam.ai/c/nudura-insulated-concrete-forms) (nudura.com)<br>The company specializes in providing innovative products and services for stronger, energy-efficient, comfortable, and eco-friendly residential and commercial buildings | Wholesale Building Materials | 🇨🇦 Barrie | 83 | 2001 |
| 37 | [ENERGI Fenestration Solutions](https://www.tamtam.ai/c/energi-fenestration-solutions) (energifenestration.com)<br>Specializing in window systems and patio doors, this company offers exceptional technical expertise in extrusion, assembly, quality control, and custom solutions for fabricators | Wholesale Building Materials | 🇨🇦 Woodbridge | 68 |  |
| 38 | [Core Molding- Cobourg, Canada](https://www.tamtam.ai/c/core-molding-cobourg-canada) (coremt.com)<br>Specializing in custom plastic molding, this company offers cost-efficient alternatives for individuals and businesses, producing high-quality plastic parts for various industries | Plastics Manufacturing | 🇨🇦 Cobourg | 58 | 1972 |
| 39 | [H. B. Fuller](https://www.tamtam.ai/c/h-b-fuller-toronto) (hbfuller.com)<br>A global provider of adhesives, sealants, structural foams, and specialty chemicals for a wide range of finished goods in various industries | Chemicals | 🇨🇦 Toronto | 52 |  |
| 40 | [Dustbane Products Ltd.](https://www.tamtam.ai/c/dustbane-products-ltd) (dustbane.ca)<br>A leading Canadian manufacturer of sustainable cleaning products and equipment, distributing through top-tier commercial and industrial distributors, focused on customer experience and innovation | Chemical Manufacturing | 🇨🇦 Ottawa | 48 | 1908 |
| 41 | [QM Group](https://www.tamtam.ai/c/qm-group) (qmigroup.com)<br>This company specializes in plastic injection molding for automotive, marine, and recreational industries, offering a range of services including painting and gas tank manufacturing | Plastics Manufacturing | 🇨🇦 Lakeshore | 47 | 1986 |
| 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 | [Ritz Plastics Inc.](https://www.tamtam.ai/c/ritz-plastics-inc) (ritzplastics.com)<br>A privately owned business based in Peterborough, Ontario, Canada, established in 1984 Specializing in manufacturing for automotive, medical, consumer goods, and electronics industries ISO/TS-16949:2009 certified | Plastics Manufacturing | 🇨🇦 Peterborough | 39 | 1984 |
| 44 | [Evoco](https://www.tamtam.ai/c/evoco) (evocoltd.com)<br>Innovative company utilizing plant-based chemistry for sustainable, high-performing product development | Climate Technology Product Manufacturing | 🇨🇦 Toronto | 38 | 2017 |
| 45 | [XYG North America](https://www.tamtam.ai/c/xyg-north-america) (xygna.com)<br>Global leader in integrated glass manufacturing with 35+ years of experience, 140+ country reach, 17,000+ employees, and 13 manufacturing complexes producing high-quality glass products for various applications | Glass Product Manufacturing | 🇨🇦 Markham | 36 | 1988 |
| 46 | [SofSURFACES Inc.](https://www.tamtam.ai/c/sofsurfaces-inc) (sofsurfaces.com)<br>This company specializes in designing, manufacturing, and installing interior and exterior rubber surface tiles for playgrounds, fitness facilities, and other applications worldwide | Recreational Facilities | 🇨🇦 Petrolia | 33 | 1993 |
| 47 | [Equispheres Inc.](https://www.tamtam.ai/c/equispheres-inc) (equispheres.com)<br>The company specializes in developing advanced materials for additive manufacturing technologies to accelerate adoption and drive innovation across various industries | Aviation and Aerospace Component Manufacturing | 🇨🇦 Ottawa | 30 | 2015 |
| 48 | [Cestoil Chemical Inc.](https://www.tamtam.ai/c/cestoil-chemical-inc) (cestoil.com)<br>A global leader in specialty chemicals, focusing on fuel additives, process additives, and advanced materials to enhance efficiency and product quality | Chemical Manufacturing | 🇨🇦 Toronto | 30 | 1999 |
| 49 | [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 |
| 50 | [NCH Canada Inc.](https://www.tamtam.ai/c/nch-canada-inc) (nch.com)<br>Global leader in industrial and commercial product manufacturing and distribution, prioritizing quality, safety, and innovation to meet clients' needs worldwide | Chemical Manufacturing | 🇨🇦 Brampton | 22 | 1964 |

## 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 12, 2026.

## More company lists in Ontario

- [The largest companies in Ontario](https://www.tamtam.ai/l/largest-companies-ontario) (5,032)
- [Multinational companies in Ontario](https://www.tamtam.ai/l/multinational-companies-ontario) (901)
- [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) (389)
- [Critical infrastructure operators in Ontario](https://www.tamtam.ai/l/critical-infrastructure-operators-ontario) (344)
- [Retail chains in Ontario](https://www.tamtam.ai/l/retail-chains-ontario) (327)
- [Companies with in-house R&D in Ontario](https://www.tamtam.ai/l/r-and-d-companies-ontario) (300)
- [Logistics companies in Ontario](https://www.tamtam.ai/l/logistics-companies-ontario) (285)
- [Education providers in Ontario](https://www.tamtam.ai/l/education-companies-ontario) (276)
- [SaaS companies in Ontario](https://www.tamtam.ai/l/saas-companies-ontario) (275)
- [Truck Transportation companies in Ontario](https://www.tamtam.ai/l/truck-transportation-companies-ontario) (270)
- [Transportation, Logistics, Supply Chain and Storage companies in Ontario](https://www.tamtam.ai/l/transportation-logistics-supply-chain-and-storage-companies-ontario) (261)
- [Public sector organisations in Ontario](https://www.tamtam.ai/l/public-sector-organisations-ontario) (259)
- [Financial Services companies in Ontario](https://www.tamtam.ai/l/financial-services-companies-ontario) (250)
- [IT Services and IT Consulting companies in Ontario](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-ontario) (235)
- [Software Development companies in Ontario](https://www.tamtam.ai/l/software-development-companies-ontario) (231)
- [Healthcare providers in Ontario](https://www.tamtam.ai/l/healthcare-providers-ontario) (226)
- [Hardware manufacturers in Ontario](https://www.tamtam.ai/l/hardware-companies-ontario) (213)
- [Professional services firms in Ontario](https://www.tamtam.ai/l/professional-services-firms-ontario) (211)
- [Hospitals and Health Care companies in Ontario](https://www.tamtam.ai/l/hospitals-and-health-care-companies-ontario) (205)
- [Distributors and wholesalers in Ontario](https://www.tamtam.ai/l/distributors-and-wholesalers-ontario) (183)
- [Companies with a mobile app in Ontario](https://www.tamtam.ai/l/companies-with-mobile-app-ontario) (181)
- [Publicly traded companies in Ontario](https://www.tamtam.ai/l/publicly-traded-companies-ontario) (156)
- [IT services companies in Ontario](https://www.tamtam.ai/l/it-services-companies-ontario) (156)

## The same list elsewhere in Canada

- [Chemical companies in Canada](https://www.tamtam.ai/l/chemical-companies-canada) (143)
- [Chemical companies in the province of Quebec](https://www.tamtam.ai/l/chemical-companies-province-of-quebec) (43)

## The same list elsewhere

- [Chemical companies in the world](https://www.tamtam.ai/l/chemical-companies-in-the-world) (6,503)
- [Chemical companies in North America](https://www.tamtam.ai/l/chemical-companies-in-north-america) (1,615)

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