What Sejong does

SJG SEJONG CO., LTD. is a South Korea-headquartered Tier-1 automotive parts manufacturer founded in 1976 (Ulsan/Seoul), operating across four business units: Exhaust Systems (catalytic converters and resonators for passenger and commercial vehicles), Hydrogen Solutions (metal bipolar plates, hydrogen sensors, and hydrogen exhaust systems for FCEVs), Electrification Components (shift-by-wire actuators, wheel speed sensors, and integrated charging control units for xEV platforms), and a centralized R&D division (SJG 중앙연구소). The company holds the #1 market share position in Korea's domestic exhaust system market, supported by annual production capacity of 9–11 million units in facilities co-located near Hyundai and Kia assembly plants to enable just-in-time delivery.

The business model is OEM-embedded hardware sales: SJG SEJONG designs, develops, and mass-produces components and sells them under contract-based pricing directly to vehicle manufacturers, with no public pricing disclosed. Its revenue stream is concentrated on enterprise automotive customers — primarily Hyundai Motor Company and Kia Corporation — and replicated across a globally distributed manufacturing footprint that includes wholly-owned subsidiaries in China (SJG Beijing/중경), the United States (SJG Alabama, SJG Georgia), Mexico (SJG Mexico), the Czech Republic (SJG Czech), Slovakia (SJG Slovakia), Russia (SJG Russia), and India (SJG India), enabling local-for-local supply to regional OEM programs.

Financially, reported revenue in local-currency terms (KRW) has been relatively flat-to-volatile between approximately 1.23–1.48 trillion across FY2021–FY2025, while profitability has improved sharply — from a net loss in FY2021 to a sizeable net income by FY2025 — reflecting a turnaround in margin structure. The company is privately held under the SJG brand umbrella with an extensive subsidiary structure but no disclosed parent, PE/VC sponsor, or public listing. Distribution is exclusively direct-to-OEM; marketing is relationship-driven rather than channel-driven, with a multilingual global portal used for visitor management and business inquiries.

Name

Sejong

Legal name

SJG SEJONG CO., LTD.

Website

https://sjku.co.kr

Company type

Private

Founded year

1976

Operating status

Operating

Headcount range

501–1,000 employees

Short description

Sejong (SJG SEJONG) is a Korean Tier-1 automotive parts manufacturer founded in 1976, producing exhaust systems, hydrogen fuel cell components, and electrification parts as an embedded OEM supplier to Hyundai and Kia across a nine-country global manufacturing footprint.

Ownership category

akta.pro rank

Product category

Automotive Parts Manufacturing

NAICS

Motor Vehicle Electrical and Electronic Equipment Manufacturing (336320), Motor Vehicle Parts Manufacturing (3363), Other Motor Vehicle Parts Manufacturing (336390)

SIC

Electronic & Other Electrical Equipment (No Computer Equip) (3600)

akta.pro primary industry

Passenger Vehicle Exhaust & Emissions Control Manufacturing (ICE) (IMACAAAI)

akta.pro secondary industries

Exhaust & Emissions Aftertreatment Systems Manufacturing (EGR/DPF/SCR/Catalysts) (IMACAHAD), Passenger Vehicle Electrical & Electronics Manufacturing (ICE) (IMACAAAK), Hybrid Powertrain Integration Manufacturing (ICE-HEV/PHEV modules) (IMACAHAJ)

Keywords

• Automotive parts
• Exhaust systems
• Hydrogen fuel cells
• Electrification components
• OEM manufacturing

Headquarters

HQ city

Ulsan

HQ country

South Korea

HQ region

Asia

Offices9 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Operations, Supply Chain, Technology or R&D, Personnel, Infrastructure

Revenue model

1. Automotive Parts Manufacturing: Design, development, and mass production of automotive components including exhaust systems, hydrogen fuel cell parts, and electrification components sold directly to OEM automotive manufacturers globally.

Go-to-market motion1 record

Distribution channels1 record

Core offering

SJG SEJONG designs, develops, and manufactures automotive exhaust systems, hydrogen fuel cell components (including metal bipolar plates and hydrogen sensors), and vehicle electrification components such as shift-by-wire actuators, wheel speed sensors, and integrated charging control units. The company supplies these products directly to global automotive OEMs and holds the #1 market share in Korea's domestic exhaust system market.

Product overview

SJG SEJONG is an automotive parts manufacturer operating as a multi-division platform with four distinct business units: Exhaust Systems (core product including catalytic converters and resonators), Hydrogen Solutions (metal bipolar plates for fuel cells, hydrogen sensors, and hydrogen exhaust systems), Electrification Components (shift by wire actuators, wheel speed sensors, and integrated charging control units), and R&D. The company maintains domestic market leadership in exhaust systems while expanding into hydrogen fuel cell technology and vehicle electrification components for the next generation of smart vehicles.

Differentiator

Problem solved

Functional benefit

Brands

• Exhaust Systems: Automotive exhaust systems including catalytic converters and resonators for passenger and commercial vehicles
• Hydrogen Solutions
• Electrification Components
• R&D

Products and services

• Exhaust Systems Complete automotive exhaust systems supplied to OEM manufacturers, in which Sejong holds the #1 market share in Korea's domestic market.
• Catalytic Converter Sub-component of the exhaust system used to reduce vehicle emissions, supplied to OEM manufacturers.
• Resonator Acoustic sub-component of automotive exhaust systems supplied to OEM manufacturers.
• Metal Bipolar Plates for Hydrogen Fuel Cells Metal bipolar plates used in hydrogen fuel cell stacks for fuel cell electric vehicles, supplied to OEM and fuel cell system manufacturers.
• Hydrogen Sensors Sensors for hydrogen detection in fuel cell vehicles, supplied to OEM and fuel cell system manufacturers.
• Hydrogen Exhaust Systems Exhaust system components engineered for hydrogen fuel cell vehicles, supplied to OEMs.
• Shift By Wire Actuator Electronic shift-by-wire actuator for electrified vehicles, replacing mechanical shifting linkages, supplied to OEM manufacturers.
• Wheel Speed Sensor Wheel speed sensors used in vehicle braking and ADAS systems, supplied to OEM manufacturers.
• Integrated Charging Control Unit Integrated charging control unit for electric vehicles that manages on-board charging functions, supplied to OEM manufacturers.

Quantifiable outcome

• #1 market share in Korea's exhaust system market since founding
• +1 more outcomes

Named customers2 records

Segments1 record

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Scale indicators3 records

Recent moves5 records

Expansion highlights5 records

Direct peers

• Hyundai Mobis: Primary Tier-1 supplier within the Hyundai Motor Group ecosystem for modules and components. Highly comparable given Sejong's deep Hyundai/Kia OEM orientation and overlapping electrification component portfolio.
• Tenneco (DRiV, Apollo Global): Major global manufacturer of exhaust systems, catalytic converters, and emissions control products for automotive OEMs. Closely comparable product portfolio and OEM-driven business model to Sejong.
• Modine Manufacturing: Manufacturer of thermal management and emissions solutions including exhaust gas recirculation (EGR) components. Comparable as a Tier-1 supplier in the automotive emissions and thermal management space.
• Futaba Industrial: Japanese automotive parts manufacturer specializing in exhaust systems and other chassis/powertrain components. Comparable as an Asia-based Tier-1 supplier with similar OEM-driven exhaust system focus.
• Eberspächer: German-headquartered specialist in exhaust technology, catalytic converters, and automotive thermal management. Directly comparable as a Tier-1 supplier focused on exhaust and emissions systems for passenger and commercial vehicles.
• Bosal: Belgian-based manufacturer of exhaust systems, catalytic converters, and tow bars for OEMs and the aftermarket. Comparable as a focused exhaust systems supplier with global OEM relationships.
• Faurecia (FORVIA): Global leader in automotive exhaust systems and emissions control technology, now operating under FORVIA. Directly comparable as a Tier-1 OEM supplier of exhaust systems, catalytic converters, and clean mobility solutions to major global OEMs.

Broad incumbents

• Marelli: Global automotive supplier with significant exhaust and emissions control operations alongside electronics and lighting. Comparable as a broad incumbent with overlapping exhaust and electronic components portfolio.
• BorgWarner: Large global Tier-1 supplier of powertrain, drivetrain, and emissions components including exhaust gas aftertreatment. Comparable as a broader incumbent competing in emissions and electrification components.

Regional players

• Katcon Global: Mexico-headquartered manufacturer of exhaust systems, catalytic converters, and emissions components serving North American OEMs. Comparable as a regional Tier-1 supplier with overlapping emissions/exhaust product focus.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/sejong-industrial-co-ltd

Revenue estimate

Valuation estimate

Number of profiles

Subsidiaries22 records

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