Sub Sem, Inc.
Sub-Sem, Inc. is a US-based contract manufacturer founded in 1976 that designs and builds custom cable assemblies, wire harnesses, power cords, retractile cords, and box build enclosures for industrial, automotive, telecommunications, medical, aerospace, military, and OEM customers across North America.
- Company typePrivate
- Founded1976
- HeadquartersCrystal Lake, United States
- Headcount1–10
- GTM typeB2B
- OfferingHardware or Manufacturing
What Sub Sem, Inc. does
Sub-Sem, Inc. is a US-based contract manufacturer founded in 1976 and headquartered in Crystal Lake, Illinois, specializing in custom cable assemblies, wire harnesses, power cords, retractile cords, and box build electromechanical enclosures. The company's core technical capabilities include overmolded cable assemblies (molded plastic or rubber layers for strain relief and environmental protection), custom wire harness design, PCB-level box build assembly with final product testing, and rigorous quality testing infrastructure including Hi-Pot, IR, and continuity testing under IPC, ISO, UL, and CSA standards. The company maintains ISO 9001:2015 certification along with UL, CSA, CE, and ROHS compliance, and serves nine verticals including industrial, automotive, telecommunications, medical, aerospace, agriculture, lighting, military, and OEM customers through a direct sales, quote-based model that accommodates projects ranging from five to 100,000 units.
In December 2023, Sub-Sem was acquired by Consolidated Electronic Wire & Cable (conwire.com) and became a subsidiary of that strategic operating parent. The parent funded a brand-new manufacturing facility in Crystal Lake into which Sub-Sem moved on October 1, 2024, quadrupling its production capacity, and also operates a manufacturing facility in Nogales, Sonora, Mexico for North American nearshoring. The company is also structured as an ESOP with a 401K employer match, combining employee ownership with the parent-company acquisition.
The go-to-market is sales-led and direct: customers request quotes through the Sub-Sem website, phone (815-459-4139), or email ([email protected]), with no channel partners, distributors, or resellers. Marketing channels are limited to a LinkedIn company page, organic SEO, and the website quote-request funnel, reflecting a relationship-driven B2B sales motion. Revenue is generated through project-based custom manufacturing orders billed under multi-year contracts. The business is privately held, is not venture-backed, and does not disclose revenue.
Sub Sem, Inc. firmographics
Firmographics- Name
- Sub Sem, Inc.
- Legal name
- Sub-Sem Inc.
- Website
- https://subsem.com
- Company type
- Private
- Founded year
- 1976
- Operating status
- Operating
- Headcount range
- 1–10 employees
- Short description
- Sub-Sem, Inc. is a US-based contract manufacturer founded in 1976 that designs and builds custom cable assemblies, wire harnesses, power cords, retractile cords, and box build enclosures for industrial, automotive, telecommunications, medical, aerospace, military, and OEM customers across North America.
- Ownership category
- akta.pro rank
Sub Sem, Inc. industry classification
Industry- Product category
- Custom Cable Assembly and Wire Harness Manufacturing
- akta.pro primary industry
- Light Assembly & Sub-Assembly (TLAIAFAD)
Keywords
Where Sub Sem, Inc. is headquartered
LocationHeadquarters
- HQ city
- Crystal Lake
- HQ country
- United States
- HQ region
- North America
Offices2 records
Markets served
Sub Sem, Inc. business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Personnel, Operations, Supply Chain, Technology or R&D, Infrastructure, Marketing or Sales
Revenue model
- Custom Cable Assemblies & Wire Harnesses: Design and manufacturing of custom cable assemblies, wire harnesses, power cords, and retractile cords. Revenue generated through project-based custom manufacturing orders of varying volumes.
- Box Build Assembly: Custom electromechanical enclosure manufacturing including integrated wire harness and cable assembly services, PCB box build assembly, system-level assembly, final product testing, and packaging.
- Contract Assembly Services: End-to-end contract assembly from design to production, handling all aspects of custom cable assemblies and complex electromechanical assemblies.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Other | Multi-year contract | Custom manufacturing - quote-based pricing |
Go-to-market motion1 record
Distribution channels1 record
Marketing channels3 records
Sub Sem, Inc. product offering
Product offeringCore offering
Sub-Sem, Inc. is a contract manufacturer specializing in custom cable assemblies, wire harnesses, power cords, and retractile cords, with added capabilities in overmolding and electromechanical box build assembly. The company designs and builds these components to customer specifications for use in industrial, automotive, telecommunications, medical, aerospace, military, agricultural, and OEM applications, handling production runs from five pieces to 100,000 units.
Product overview
Sub-Sem Inc. is a manufacturer of custom cable assemblies, wire harnesses, power cords, and retractile cords, offering products as a unified portfolio of electromechanical components. The core product line includes Wire Harnesses and Cable Assemblies (including Overmolded Cable Assemblies as a specialized variant), Power Cords, Retractile Cords, and Box Builds as electromechanical enclosures. These products are complemented by Contract Assembly services that handle design-to-production for integrated projects. The company serves diverse industries including aerospace, automotive, industrial, telecommunications, medical, military, and agricultural sectors, handling projects ranging from five pieces to 100,000 units.
Differentiator
Problem solved
Functional benefit
Products and services
- Wire Harnesses Custom wire harnesses designed for durability, performance, and reliability in complex systems, serving automotive, aerospace, industrial, and telecommunications industries.
- Cable Assemblies Custom cable assemblies tailored to unique industry requirements, including specific connectors, shielding, and material choices for aerospace, telecommunications, industrial, and medical sectors.
- Overmolded Cable Assemblies Advanced overmolded cable assemblies featuring a molded layer of plastic or rubber providing superior durability, strain relief, and protection against environmental stressors for automotive, medical, military, and renewable energy applications.
- Power Cords High-quality power cords built with durable materials for reliable performance in demanding commercial, industrial, and consumer electronics environments, available in various lengths, plug types, and voltage ratings.
- Retractile Cords Specialized retractile cords designed for applications requiring compact storage and extended reach, built for durability and reliable performance.
- Box Builds Custom electromechanical enclosures containing wire harnesses, cables, connectors, relays, switches, and PCB assemblies, designed and manufactured to meet specific project demands across aerospace, agriculture, automotive, industrial, medical, military, and telecommunications industries.
- Contract Assembly End-to-end contract assembly services handling every aspect of projects from design to final production, providing seamless integration of custom cable assemblies, wire harnesses, and complex electromechanical assemblies.
Quantifiable outcome
- Production capacity quadrupled with new facility
- +1 more outcomes
Companies that use Sub Sem, Inc.
Customer profileSegments9 records
Ideal customer profiles3 records
Sub Sem, Inc. technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature4 records
Sub Sem, Inc. partnerships and signals
Strategic signalScale indicators4 records
Recent moves7 records
Expansion highlights5 records
Sub Sem, Inc. competitors and assessment
Company assessmentBroad incumbents
- TE Connectivity: Global incumbent in connectors, sensors, and cable assemblies serving automotive, aerospace, industrial, and medical markets. Overlaps directly with Sub-Sem in custom cable and wire harness work but operates at vastly greater scale with proprietary connector IP.
- Molex (Koch Industries): One of the largest global manufacturers of electronic interconnect solutions, including custom cable assemblies, wire harnesses, and overmolded connectors. Comparable in product and customer verticals (automotive, medical, industrial, telecom) but far broader in scale and product breadth.
- Amphenol: Major global interconnect, antenna, and cable assembly manufacturer serving aerospace, automotive, broadband, industrial, and military markets. Compares to Sub-Sem through its cable assembly and overmolded cable offerings, though at significantly larger scale and with diversified proprietary IP.
Direct peers
- Epec Engineered Technologies: US-based custom manufacturer of cable assemblies, wire harnesses, and box builds serving industrial, medical, and aerospace customers. Comparable mid-market contract manufacturing model with similar quote-based, low-volume-to-high-volume flexibility.
- Quell Corporation: US-based contract manufacturer of custom cable assemblies, wire harnesses, and box builds for aerospace, defense, and medical markets. Similar mid-sized contract manufacturing model targeting regulated, high-mix customers.
- Carlisle Interconnect Technologies: Specializes in custom cable assemblies, wire harnesses, and electromechanical box builds for aerospace, defense, and medical customers — directly mirroring Sub-Sem's higher-end vertical mix and integration model. Highly comparable in product complexity, regulatory requirements, and end customers.
- Minco Products: Designs and manufactures custom cable assemblies, wire harnesses, heaters, and integrated thermal solutions for medical, aerospace, and industrial customers. Comparable in vertical mix, custom manufacturing approach, and integrated electromechanical capabilities.
- Consolidated Electronic Wire & Cable: Parent company of Sub-Sem and a direct peer — also manufactures custom cable assemblies, wire harnesses, and power cords for industrial, medical, and military customers. Strongly comparable product line, customer base, and contract manufacturing model.
- C&M Corporation: Custom manufacturer of wire harnesses, cable assemblies, and electromechanical assemblies for industrial, medical, and transportation customers. Direct competitor in the North American contract manufacturing market with similar product breadth.
- Meritec (a division of JST): Custom cable assembly and wire harness manufacturer serving military, aerospace, medical, and industrial customers. Comparable in regulated end markets, custom overmolded capabilities, and project-based manufacturing model.
Market position
Weaknesses5 records
Competitive moat4 records
Key highlights7 records
Customer concentration
Sub Sem, Inc. social profiles
Digital presenceSub Sem, Inc. compliance and trust
Trust signalCompliance5 records
Sub Sem, Inc. financial estimates
Financial estimateRevenue estimate
Valuation estimate
Sub Sem, Inc. leadership team
Management profileNumber of profiles
Sub Sem, Inc. funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Sub Sem, Inc. M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Sub Sem, Inc.
What does Sub Sem, Inc. do?
Sub-Sem, Inc. is a contract manufacturer specializing in custom cable assemblies, wire harnesses, power cords, and retractile cords, with added capabilities in overmolding and electromechanical box build assembly. The company designs and builds these components to customer specifications for use in industrial, automotive, telecommunications, medical, aerospace, military, agricultural, and OEM applications, handling production runs from five pieces to 100,000 units.
Is Sub Sem, Inc. a public or private company?
Sub Sem, Inc. is a private company. It is classified as corporate owned and is currently operating.
When was Sub Sem, Inc. founded?
Sub Sem, Inc. was founded in 1976. It employs 1 to 10 people.
Where is Sub Sem, Inc. based?
Sub Sem, Inc. is headquartered in Crystal Lake, United States, in the North America region.
How does Sub Sem, Inc. make money?
Three revenue lines are on record. Custom Cable Assemblies & Wire Harnesses are the primary driver. The others are box Build Assembly and contract Assembly Services.
Who are Sub Sem, Inc.'s main competitors?
Broad incumbents on record are TE Connectivity, Molex (Koch Industries) and Amphenol. Direct peers are Epec Engineered Technologies, Quell Corporation, Carlisle Interconnect Technologies, Minco Products, Consolidated Electronic Wire & Cable, C&M Corporation and Meritec (a division of JST).
Does Sub Sem, Inc. have an API?
No public API is recorded for Sub Sem, Inc..
What industry is Sub Sem, Inc. in?
Sub Sem, Inc.'s product category is Custom Cable Assembly and Wire Harness Manufacturing. Its primary akta.pro industry code is TLAIAFAD, Light Assembly & Sub-Assembly.