The manufacturing sector in Delaware is characterized by a strong presence of chemical manufacturing and materials science companies. These are primarily large, established firms, with several founded in the early to mid-20th century. Notable companies include DuPont, a global firm focused on essential innovations, and Solenis, a specialty chemicals producer for water-intensive industries.
Other significant players are W. L. Gore & Associates, a materials science company, and Ashland, which provides additives and specialty ingredients. The Chemours Company, driven by chemistry for various industries, and Incyte, a biopharmaceutical company focused on oncology, are also prominent. A clear pattern is the concentration of headquarters in Wilmington, indicating its importance as a commercial hub for these industries.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
DuPontdupont.com
A global company focused on creating essential innovations, uncovering insights, and inventing a better now for a brighter future |
22,104 | |||
| 2 |
Solenissolenis.com
A global specialty chemicals producer offering sustainable solutions for water-intensive industries with a wide range of products and technologies for improving operational efficiency and environmental impact |
21,407 | |||
| 3 |
W. L. Gore & Associatesgore.com
A global materials science company solving technical challenges in diverse environments, generating annual revenues of $48 billion, and improving lives |
10,358 | |||
| 4 |
Ashlandashland.com
This company provides additives and specialty ingredients to various consumer and industrial markets globally, focusing on innovative solutions for complex customer problems. |
5,843 | |||
| 5 | 4,635 | ||||
| 6 |
The Chemours Companychemours.com
A company driven by chemistry, providing sustainable solutions for various industries like automotive, electronics, energy, and construction through Courageous Chemistryâ„¢ |
4,528 | |||
| 7 |
Enovisenovis.com
A medical technology company creating innovative solutions for better patient outcomes, improved workflows, and active lifestyles through collaboration with healthcare professionals |
3,892 | |||
| 8 |
Incyteincyte.com
Global biopharmaceutical company focused on discovering, developing, and commercializing innovative medicines for patients with unmet medical needs in Oncology and Inflammation & Autoimmunity. |
3,425 | |||
| 9 |
Mountaire Farmsmountaire.com
A leading chicken producer with operations in multiple states, dedicated to high quality products and animal welfare for consumers worldwide |
2,249 | |||
| 10 | 1,255 | ||||
| 11 |
Chem-Aqua, Inc.chemaqua.com
A leading provider of custom water treatment solutions for boiler, cooling, and process water systems, focusing on energy efficiency and cost savings |
950 | |||
| 12 |
Amphenol Aerospaceamphenol-aerospace.com
Designs and manufactures high-quality, rugged interconnect solutions for military and commercial aerospace markets, including circular, rectangular, fiber optic connectors, and integrated systems. |
773 | |||
| 13 |
The LYCRA Companylycra.com
Innovates and produces fiber and technology solutions for global apparel and hygiene industries, focusing on comfort and lasting performance benefits for clothing across many categories. |
611 | |||
| 14 |
DuPontâ„¢ Spectrumâ„¢spectrumplastics.com
Leading partner in developing and manufacturing critical polymer-based components and finished devices for medical and demanding applications. |
704 | |||
| 15 |
Bel Fuse Inc.belfuse.com
Designs, manufactures, and markets products for powering, protecting, and connecting electronic circuits. A global supplier with technical innovation and cost-effective solutions. |
676 | |||
| 16 |
TA Instrumentstainstruments.com
Develops and supplies instruments for material characterization, including thermal analysis, rheology, and microcalorimetry, used for research, analysis, and quality control. |
655 | |||
| 17 |
Rain Carbon Incraincarbon.com
Global producer of carbon-based products and advanced materials, transforming byproducts into high-value products for industrial processes and manufactured goods worldwide |
575 | |||
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| 18 |
ILC Doverilcdover.com
A global leader in innovative solutions for biopharmaceutical, pharmaceutical, and aerospace industries with a focus on flexible protective solutions since 1947 |
568 | |||
| 19 |
DuPont Water Solutionsdupont.com
The company provides solutions for a sustainable energy and water future globally, assisting businesses in making real progress in every industry |
558 | |||
| 20 |
Seacretseacret.com
This company manufactures skincare products using minerals and salts from the Dead Sea, focusing on purity, effectiveness, and ethical practices |
482 | |||
| 21 |
SDIX LLC - An OriGene Companysdix.com
produces high-quality, large-scale, GMP antibodies and immunoreagents for diagnostics, offering contract manufacturing and antibody production services, all manufactured in the USA. |
411 | |||
| 22 |
Crystal Steel Fabricators, Inc.crystalsteel.com
A global steel fabricator with multiple locations, offering quality steel fabrication, design, and delivery services to clients on the East Coast |
347 | |||
| 23 |
SPI Pharmaspipharma.com
Supplies pharmaceutical industry with engineered products and innovative solutions, improving drug formulation and delivery for patient needs with functional excipients and active ingredients. |
317 | |||
| 24 |
Allen Harim Foodsallenharimllc.com
A leading producer of No Antibiotic Ever chicken, prioritizing quality, service, and value while also focusing on animal welfare, the environment, and community |
267 | |||
| 25 |
Laird Performance Materialslaird.com
Enables and improves signal integrity and power transmission in advanced interconnects; protects electronics, manages electromagnetic interference and heat, custom precision metal parts |
219 | |||
| 26 |
Allied Moulded Products, Incalliedmoulded.com
Manufactures nonmetallic electrical boxes and enclosures for residential, commercial, and industrial markets, offering a range of products and custom solutions with focus on quality and innovation. |
209 | |||
| 27 |
Noramconoramco.com
Global leader in manufacturing controlled substances for pharmaceutical medicines, including those for ADHD, pain, and addiction, ensuring DEA-compliant security and supply from kilos to multi-tons. |
201 | |||
| 28 |
Summit Aviationsummit-aviation.com
Aircraft maintenance, modifications, avionics, engines, mission equipment integration, paint, sales & leasing, field training, flight testing support, and OTC part sales |
183 | |||
| 29 |
Covation Biocovationbio.com
A leading global innovator offering high-performance, sustainable solutions in various industries through novel bio-based products, building on a rich scientific legacy |
64 | |||
| 30 |
Atlantis Industries Corporationatlantisusa.com
A leading injection molding company with over 60 years of experience, specializing in serving various industries with innovative plastic manufacturing solutions |
43 | |||
| 31 |
Colfax Corporationenovis.com
Enovis, formerly known as Colfax, is a publicly traded company Follow us on LinkedIn for updates and information |
31 | |||
| 32 |
Smartkemsmartkem.com
Innovative semiconductor polymer transistors enable cost-effective, high-performance displays like microLED, miniLED, and AMOLED, compatible with existing manufacturing infrastructure |
27 | |||
| 33 | 
Millennium Microwave Corpmicrowave2000.com
An electrical/electronic manufacturing company located in Seaford, Delaware, specializing in microwave technology and products for various industries |
19 | |||
| 34 |
CV OPTICS USA INC.cvopticsusa.com
A leading lens manufacturer and distributor offering a wide variety of optical lens types, including specialized products like blue filter and photochromic lenses |
7 | |||
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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 11, 2026.
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The same list elsewhere in United States
- Manufacturers in the United States 8,678
- Manufacturers in California 1,066
- Manufacturers in Texas 621
- Manufacturers in Illinois 528
- Manufacturers in Ohio 479
- Manufacturers in Michigan 454
- Manufacturers in New York State 398
- Manufacturers in Pennsylvania 364
- Manufacturers in Wisconsin 331
- Manufacturers in Georgia 281
- Manufacturers in Florida 274
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- Manufacturers in Massachusetts 269
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