What Sejong Industry does

Sejong Industrial Co., Ltd. is a privately-held Korean automotive parts manufacturer founded in 1976 and headquartered in Ulsan — the industrial heart of Hyundai Motor Group's manufacturing base. The company specializes in exhaust system components and engine support structures, with a documented product portfolio of three core lines: mufflers (noise reduction via pulsatory pressure management and exhaust gas cooling through surface area variation), exhaust gas converters/catalytic converters (purification of CO, HC, and NOx using metallic oxide and dual or three-way catalyst technologies), and side member assemblies/engine support frames (structural separation of the engine compartment from the cabin with integrated noise and vibration insulation). The company describes active R&D investment in environment-friendly auto parts and states an ambition to become one of the world's top five auto parts manufacturers.

The business operates as a B2B Tier-1/Tier-2 hardware supplier serving two documented customer segments: automotive manufacturers (primary, supplying exhaust and engine support components for vehicle production) and the auto parts aftermarket (secondary, supplying replacement components). Revenue is generated through hardware sales under non-disclosed, inquiry-based pricing with no publicly available list prices. The go-to-market is sales-led and relies heavily on the EC21.com global B2B marketplace for buyer discovery and inbound inquiries, supplemented by direct contact via the President, Lee-sik, Park. Geographic footprint is concentrated in East Asia/Korea, though the EC21 storefront signals intent to reach global buyers.

The disclosed operational scale is substantial — headcount above 1,000 employees and annual revenue stated as "More than 100,000,000" (currency unspecified but inconsistent with the employee base if interpreted as KRW), placing Sejong among the larger Korean independent auto parts specialists. However, several red flags emerge from the data: the EC21 storefront's last login date is June 25, 2007, suggesting a stale digital sales channel; no funding rounds, M&A activity, recent product launches, partnerships, patents, certifications, or leadership transitions are recorded; and no public listing, parent company, or ownership structure is disclosed. The absence of these signals — combined with a single named executive and inquiry-based GTM — indicates a mature but operationally opaque private supplier with limited recent verifiable strategic momentum.

Name

Sejong Industry

Legal name

Sejong Industrial Co., Ltd.

Website

https://sejongind.en.ec21.com

Company type

Private

Founded year

1976

Operating status

Operating

Headcount range

11–50 employees

Short description

Sejong Industrial Co., Ltd. is a Korean automotive parts manufacturer founded in 1976, specializing in exhaust system components — mufflers, catalytic converters, and engine support frames — serving automotive OEMs and the aftermarket primarily from its Ulsan headquarters.

Ownership category

akta.pro rank

Product category

Automotive Parts Manufacturing

NAICS

Motor Vehicle Parts Manufacturing (3363), Other Motor Vehicle Parts Manufacturing (336390)

akta.pro primary industry

Exhaust & Emissions Aftertreatment Systems Manufacturing (EGR/DPF/SCR/Catalysts) (IMACAHAD)

akta.pro secondary industries

Passenger Vehicle Exhaust & Emissions Control Manufacturing (ICE) (IMACAAAI), Aftermarket Exhaust & Emissions Components Manufacturing (Mufflers/Catalysts/DPF/EGR) (IMACANAE), Automotive NVH, Insulation & Acoustic Components Manufacturing (Sound Deadening/Thermal Barriers) (IMACAKAH)

Keywords

• Automotive exhaust systems
• Muffler manufacturing
• Exhaust gas catalysts
• Engine support frames
• Auto parts OEM

Headquarters

HQ city

Ulsan

HQ country

South Korea

HQ region

Asia

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Operations, Personnel, Supply Chain, Technology or R&D, Marketing or Sales

Revenue model

1. Auto Parts Manufacturing: Manufactures and sells automotive components including mufflers, engine supports, exhaust gas converters, and side member assemblies to automotive manufacturers and aftermarket

Go-to-market motion1 record

Distribution channels1 record

Marketing channels1 record

Core offering

Sejong Industrial Co., Ltd. manufactures and sells automotive exhaust system and engine support components, including mufflers, exhaust gas converters/catalysts, and side member assemblies. Products are designed to reduce engine noise, cool and direct exhaust gases, purify toxic emissions (CO, HC, NOx), and provide structural/engine support with vibration insulation. The company supplies these components to automotive manufacturers and the aftermarket via the EC21.com B2B marketplace.

Product overview

Sejong Industrial Co., Ltd. is an automotive parts manufacturer specializing in exhaust system components. The company's product portfolio comprises three main product lines: Mufflers (for noise reduction and exhaust gas cooling/direction), Exhaust Gas Convertors (catalyst-based devices for purifying toxic emissions including CO, HC, and NOx), and Side Member Assemblies (engine support frames that separate the engine room from the vehicle interior while providing noise and vibration insulation). These products work together as part of a complete exhaust system solution for vehicles.

Differentiator

Problem solved

Functional benefit

Products and services

• Muffler Automotive muffler that reduces engine exhaust noise by decreasing pulsatory explosion pressure, cools hot pressurized exhaust gas using surface area variations, and guides exhaust gas flow away from occupants and vehicles.
• Exhaust Gas Convertor Exhaust gas purifying device that removes toxic emissions (CO, HC, NOx) generated during engine combustion using metallic oxide, dual, or three-way catalyst converters, for automotive OEMs.
• Side Member Assembly Engine support frame that separates the car interior space from the engine room, featuring insulation pads that reduce noise and vibration generated in the engine compartment.

Segments2 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Scale indicators4 records

Recent moves3 records

Expansion highlights3 records

Broad incumbents

• OPmobility (formerly Plastic Omnium): French tier-1 with a clean and connected mobility portfolio that historically included exhaust systems before pivoting toward plastic and energy storage. Comparable as a broad automotive components incumbent overlapping with Sejong on structural/exhaust modules.
• Continental AG: German tier-1 with a broad automotive portfolio including exhaust gas aftertreatment, sensors, and powertrain electronics. Comparable as a broad incumbent overlapping with Sejong in catalytic converter/emissions control technology for ICE and hybrid vehicles.
• Marelli Holdings Co., Ltd. Global tier-1 automotive supplier with exhaust and emissions control offerings alongside broader electronics and lighting portfolios. Comparable as a broad incumbent with overlapping exhaust manufacturing capability serving global OEMs.
• Hyundai Mobis: Korea's largest auto parts supplier and Hyundai Motor Group affiliate, headquartered near Ulsan. Comparable as a broad Korean auto parts incumbent serving the same OEM customer base as Sejong, though with vastly larger scale and broader module coverage.

Direct peers

• Tenneco (DRiV / Apollo): US-based exhaust and emissions control manufacturer with global operations, recently taken private by Apollo and reorganized as DRiV. Directly competes with Sejong in mufflers, catalytic converters, and exhaust aftertreatment modules supplied to OEMs.
• Futaba Industrial Co., Ltd. Japanese tier-1 auto parts maker specializing in exhaust system components and body frame structures. Highly comparable to Sejong given similar muffler/exhaust focus and structural module expertise supplying Japanese OEMs.
• Sango Co., Ltd. Japanese exhaust system manufacturer producing mufflers, catalytic converters, and exhaust manifolds. Closely matches Sejong's product mix and Asian OEM customer orientation.
• Eberspächer: German global leader in exhaust systems, catalytic converters, and acoustic components for ICE and hybrid vehicles. Most directly comparable to Sejong given overlapping exhaust technology, muffler design, and emissions aftertreatment focus serving global OEMs.
• Faurecia (FORVIA): French tier-1 supplier (now FORVIA) historically dominating exhaust systems and emissions control before spinning into clean mobility. Directly comparable on muffler, catalytic converter, and exhaust manifold manufacturing for passenger vehicles worldwide.
• Bosal Group: Belgian family-owned tier-1 supplier of exhaust systems, catalytic converters, and tow bars. Comparable niche-specialist exhaust manufacturer with similar geographic footprint and product focus to Sejong.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks5 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/sejong-industry

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Sejong Industry