| # | Company | Employees |
|---|---|---|
| 1 |
Amsted Industriesamsted.com
Global manufacturer of industrial components for railroad, automotive, commercial vehicle, construction, and building markets, with a focus on innovation and employee ownership |
3,554 |
| 2 |
SunSourcesun-source.com
A leader in industrial and mobile fluid power distribution, offering innovative solutions to reduce maintenance costs, increase productivity, and provide exceptional customer service |
2,048 |
| 3 |
Power Plant Servicesppsvcs.com
A full-service provider in the power generation industry, offering non-OEM parts manufacturing, field machining, repairs, engineering services, and reverse engineering capabilities |
1,946 |
| 4 |
MacLean-Foggmacleanfogg.com
A global enterprise founded in 1925 that specializes in providing solutions, products, and services with world-class quality to customers worldwide |
1,261 |
| 5 | 1,170 | |
| 6 |
Marmon Holdings, Inc.marmon.com
A diverse portfolio of over 120 autonomous businesses worldwide, each serving unique industries under the umbrella of a Berkshire Hathaway company |
638 |
| 7 | 605 | |
| 8 |
Hydro, Inc.hydroinc.com
Engineering analysis, quality workmanship, and field service to optimize pumping systems, focusing on root cause analysis for improved plant operation |
571 |
| 9 |
Hydro-Gearhydro-gear.com
A world leader in precision drive solutions for commercial, residential, and electric markets, manufacturing high-performance hydrostatic drive systems, electric products, and hydraulic solutions |
546 |
| 10 |
Senior Flexonicsseniorflexonics.com
Engineering and manufacturing thermal management and fluid conveyance products for land vehicles, energy, industrial, and specialty applications across multiple industries. |
535 |
| 11 |
HydraForce Inc.hydraforce.com
A global designer and manufacturer of motion control systems for various off-highway industries with locations in the USA, Great Britain, Brazil, and China |
493 |
| 12 |
Mitutoyo America Corporationmitutoyo.com
A leading metrology company providing advanced measurement tools, calibration services, metrology solutions, education, and training to improve manufacturing quality worldwide |
468 |
| 13 |
Smalleysmalley.com
Global manufacturer, inventor of edgewound wave spring, provides wave springs, retaining rings, and constant section rings, standard and custom options, no tooling charges. |
359 |
| 14 |
New York Blower Companynyb.com
Established in 1889, we are an international leader in industrial fan manufacturing with fifteen facilities worldwide, including a new plant in Mississippi |
338 |
| 15 |
John Deere Construction & Forestry Companydeere.com
A machinery company in Moline, IL, specializing in construction and forestry equipment |
316 |
| 16 |
AISIN Manufacturing Illinoisaisinillinois.com
Manufacturer of automotive products including Sunroofs, Slide and Back Door components, Center Pillar Garnishes, and Door Handles for major industry customers |
309 |
| 17 |
Deublin Companydeublin.com
Global manufacturer of rotary unions for transfer of pressurized fluid into rotating machinery, serving various industries worldwide with steam joints and electrical slip rings |
301 |
| 18 |
IDC Engineeringidc-tech.com
A reliable partner in digital transformation and specialized engineering solutions, delivering on-time professional expertise across various industries with a focus on client relationships |
252 |
| 19 |
Sumitomo Electric Carbidesumicarbide.com
Innovative cutting tool solutions for increased productivity and precision through R&D, design ingenuity, and a wide range of turning, drilling, and milling systems |
218 |
| 20 |
moveeromoveero.com
A global manufacturer of off-highway wheels, supplying high-quality products to agricultural, construction, industrial, and mining industries worldwide |
192 |
| 21 |
Buehler An ITW Companybuehler.com
Manufacturer of scientific equipment for material analysis & quality control, specializing in materialography, metallography, metallurgy, and petrography Serving global industries with innovative solutions |
185 |
| 22 |
West Side Tractorwestsidetractorsales.com
We are a leading distributor of John Deere construction and forestry equipment in Northern Illinois and Indiana, committed to providing exceptional support services |
176 |
| 23 |
THK America, Inc.thk.com
Pioneering Linear Motion Systems since 1971, specializing in precision motion products for industries such as robotics, aerospace, automotive, and more |
175 |
| 24 |
Bi-Linkbi-link.com
Global supplier of precision mechanical components for Automotive, Consumer, Wireless, and Medical Device markets, offering metal stamping, injection molding, assembly, and engineering services |
167 |
| 25 |
Larsen Manufacturing LLClarsenmfg.com
A premier metal manufacturer specializing in sheet metal stamping, fabrication, and contract manufacturing with cutting-edge equipment and 25 years of excellence |
166 |
| 26 |
Bearing Headquarters Companybearingheadquarters.com
A leading supplier of bearings and power transmission parts, offering a wide range of products and services to ensure peak machinery performance |
161 |
| 27 |
Tungaloy-NTK America, Inc.tungaloy.com
A leading provider of innovative cutting tools and solutions, leveraging expertise in powder metallurgy to help manufacturing companies increase productivity and profitability |
152 |
| 28 |
Mitsuboshi Belting (MBL) USAmblusa.com
A manufacturer and distributor of Mitsuboshi power transmission belts for automotive, recreational, agricultural, and industrial markets in the Americas |
148 |
| 29 |
HEIDENHAIN North Americaheidenhain.us
A pioneering company specializing in developing advanced encoders, CNC controls, software solutions, and measurement devices for various industries worldwide |
146 |
| 30 |
Connor Manufacturingconnorms.com
A global precision engineering solution provider for stamped metals and metal fabrication needs, serving various markets including electric vehicles, automotive, and consumer electronics |
126 |
| 31 |
Camcraft, Inc.camcraft.com
A precision machining company with over 50 years of experience, specializing in challenging machined parts applications and supporting product development with exceptional quality and performance metrics |
125 |
| 32 |
Swiss Automation, Inc.swissautomation.com
A leading precision machining company serving various industries with dual spindle CNC turning technology, specializing in complex parts with tight tolerances |
96 |
| 33 |
Val-Matic Valve & Mfg. Corp.valmatic.com
A leading manufacturer of Air Valves, Check Valves, and Quarter Turn Shut-Off Valves for various industries, focused on exceptional design and quality |
94 |
| 34 |
Delta Power Companydelta-power.com
Manufacturing robust cartridge valves for hydraulics industry, specializing in Ag and Construction Equipment, with a commitment to exceeding customer expectations |
73 |
| 35 |
BIG DAISHOWA-Americasbigdaishowa.com
A global leader in high precision tooling systems for the metalcutting industry, offering superior quality products and solutions worldwide |
56 |
| 36 |
Ludlow Mfg Includlowmfg.com
Metal fabrication company specializing in serving OEMs with CNC technology, skilled craftsmen, lean manufacturing, and high customer service levels ISO 9001-2008 registered, woman-owned small business |
33 |
| 37 |
PRIMA POWER NORTH AMERICA, INC
A machinery company located in Arlington Heights, IL, specializing in manufacturing high-quality industrial equipment for various industries in the United States |
29 |
| 38 |
RAMCEL Precision Stamping and Manufacturing LLCramcel.com
A provider of custom stamping solutions with expertise in problem-solving, tooling design, and value-added operations for various industries since 1951 |
26 |
| 39 |
CenMac Metalworkscenmacmetalworks.com
Family-owned manufacturing company specializing in laser-cutting, forming, CNC machining, welding, plasma cutting, and metal stamping for various industries |
24 |
| 40 |
ATS SORTIMAT USA LLC
They are a machinery company located in Rolling Meadows, Illinois, specializing in providing automated solutions for industrial sorting and material handling |
24 |
| 41 |
Midwest Optical Systemsmidopt.com
A leading manufacturer of custom optical filters and lenses for industrial imaging applications, offering a wide range of reliable and cost-effective solutions |
20 |
| 42 |
CM International Industriescmiic.com
The company specializes in manufacturing products for top industrial corporations |
20 |
| 43 |
Tishma Technologiestminn.com
Specializing in high-quality packaging machinery and systems, offering unique solutions such as cartoners, case packers, palletizers, and robotics for diverse packaging needs |
19 |
| 44 |
Pfaudler US Inc
A machinery company located in Des Plaines, Illinois, specializing in industrial equipment and services in the United States |
19 |
| 45 |
Emuge Corp
A machinery company located in Marengo, Illinois, specializing in manufacturing and providing equipment for various industries in the United States |
18 |
| 46 |
Aura Systems Inc.aura-systems.com
An industrial equipment builder in Decatur, IL, specializing in customized manufacturing solutions for various industries, with a team of experts and in-house fabrication capabilities |
15 |
| 47 |
Infinity Tool Manufacturinginfinitytoolmfg.com
Industry-leading manufacturer of drilling bits and accessories utilizing state-of-the-art machinery to provide top quality products since 2009 Exceptional service and quality |
14 |
| 48 |
DUGAN TOOL & DIE, INC.dugantool.net
A machinery company based in Illinois specializing in tools and dies for various industries |
10 |
| 49 |
Ikonic Engineering And Designikonicinc.com
An Engineering Design and Manufacturing company specializing in 3D and 2D modeling, new product development, analysis, material recommendations, and die design |
9 |
| 50 |
Janome Industrial Equipment USA, Inc.janomeie.com
A company based in Elk Grove Village, Illinois, specializing in industrial equipment and solutions for various industries |
5 |
| 51 |
Plastic Processing Solutionsplasticprocessingsolutions.net
Specializing in plastic processing solutions, the company offers turn-key solutions including machinery, engineering, integration, and mechanical services |
3 |
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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 24, 2026.
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