SPG

What SPG does

SPG (주식회사 에스피지 / SPG Co., Ltd.) is a South Korean precision gearhead and motor manufacturer founded in 1991 and headquartered in the Namdong Industrial Complex in Incheon. The company designs and produces five core product lines: the SDD Robot Actuator (an integrated high-torque motor with a low reduction ratio of 10:1 or less, eliminating the need for a separate high-ratio reducer), the KSH Strain Wave Gear, the KSR Cycloidal Robot Reducer, a Precision Planetary Gearhead for servo applications, and Standard AC Geared Motors for industrial automation. Under CEO Yeo Young-gil (여영길), SPG positions itself as Korea's leading specialist in geared motors and precision reducers, with stated ambitions to become a global leader in the category.

The company operates a hardware sales model, monetizing engineered components sold directly to manufacturers and through a global distribution network of domestic and international branches, domestic specialty stores, and overseas agencies. Revenue is generated across three primary customer segments: humanoid robot manufacturers (precision actuators and reducers for robot joints), medical robotics companies (custom precision actuators, anchored by an MOU with CUREXO signed March 12, 2026), and industrial automation customers (smart factory and manufacturing equipment). SPG reports FY2024 revenue of 416,334 million KRW with total assets of 365,091 million KRW and equity capital of 193,091 million KRW, disclosed via IR materials dated March 26, 2025. Pricing is not publicly disclosed.

Strategically, SPG is repositioning its portfolio toward higher-growth robotics end markets while maintaining its legacy industrial automation base. The company has set a five-year target of 5,000 humanoid actuators in annual sales to materially increase its share of the robot parts market, and has formalized its medical robotics push through the CUREXO partnership covering custom design, technical exchange, and joint marketing. Distribution is supported by a web-based gear reducer selection tool (webcatalog.spg.co.kr) and a dedicated manual/technical data portal (spgm.co.kr). No AI/ML, software, or platform capabilities are disclosed in source materials; the competitive proposition is entirely electromechanical.

Name

SPG

Legal name

주식회사 에스피지 (SPG Co., Ltd.)

Website

https://spg.co.kr

Company type

Private

Founded year

1991

Operating status

Operating

Headcount range

501–1,000 employees

Short description

SPG (주식회사 에스피지) is a South Korean precision gearhead and motor manufacturer producing robot actuators, strain wave and cycloidal reducers, planetary gearheads, and AC geared motors for humanoid robot, medical robotics, and industrial automation customers, distributed through global branches and agencies.

Ownership category

akta.pro rank

Product category

Precision Motion Components

NAICS

Fluid Power Cylinder and Actuator Manufacturing (333995), Speed Changer, Industrial High-Speed Drive, and Gear Manufacturing (333612)

SIC

Motors & Generators (3621)

akta.pro primary industry

Motion & Machine Control (CNC, Robotics Controllers, Servo/Motion Controllers) (IMAGABAG)

akta.pro secondary industries

Robot Hardware, Actuators & Components (sensors, grippers, motors) (HDAAAIAL), Gearmotors, Gearboxes & Speed Reducers (IMAGACAF), Actuators & Motion Devices (Linear, Rotary, Electric Actuators for Motion Control) (IMAHAGAG)

Keywords

• Precision gearheads
• Robot actuators
• Strain wave gears
• Cycloidal reducers
• AC geared motors

Headquarters

HQ city

Incheon

HQ country

South Korea

HQ region

Asia

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Precision Actuators and Reducers Sales: SPG generates revenue through the manufacture and sale of precision reducers and actuators for robotics applications. The company supplies precision actuators optimized for medical robots and humanoid robot applications, targeting annual sales of 5,000 humanoid actuators.
2. Standard AC Geared Motors: Revenue from standard AC geared motors for industrial automation and smart factory applications.

Go-to-market motion1 record

Distribution channels4 records

Marketing channels4 records

Core offering

SPG designs and manufactures precision gearheads and motors, including the SDD Robot Actuator (high-torque motor with low reduction ratio), KSH Strain Wave Gear, KSR Cycloidal Robot Reducer, Precision Planetary Gearhead, and Standard AC Geared Motor. The company supplies these motion components to humanoid robot manufacturers, medical robotics companies, and industrial automation customers globally, with an explicit growth focus on robot joint actuators targeting 5,000 humanoid actuator sales annually within five years.

Product overview

SPG is a precision gearhead and motor solutions company offering a portfolio of five core product lines: the SDD Actuator for Robotics (low-ratio actuator combining high-torque motor without high-ratio reducer), KSH Strain Wave Gear, KSR Cycloidal Robot Reducer, Precision Planetary Gearhead, and Standard AC Geared Motor. The company serves robotics and industrial automation markets, recently expanding into humanoid robot components through precision reducers and actuators, with a partnership for medical robotics applications.

Differentiator

Problem solved

Functional benefit

Products and services

• SDD Robot Actuator (SDD 로봇 액추에이터) Robot joint actuator combining a high-torque motor with a low reduction ratio (generally 10:1 or less) without a high-ratio reducer. Features integral design, exceptional thermal performance, high precision and rigidity gears, smooth operation with low noise, and compact lightweight structure. Targeted at humanoid robot manufacturers and robotics integrators.
• KSH Strain Wave Gear (KSH 로봇감속기) Strain wave gear reducer for robotics applications, designed for high-precision motion transmission in robot joints. Targeted at robot manufacturers requiring precision harmonic drive-style reducers.
• KSR Cycloidal Robot Reducer (KSR 로봇감속기) Cycloidal robot reducer designed for precision motion control in robotic applications. Targeted at robot manufacturers requiring high-accuracy cycloidal reduction.
• Precision Planetary Gearhead (정밀 유성감속기) Precision planetary gearhead for servo motor applications, providing high-accuracy power transmission. Targeted at industrial automation OEMs and servo system integrators.
• Standard AC Geared Motor (표준 AC 기어드모터) Standard AC geared motor combining AC motor technology with gear reduction for industrial automation and smart factory applications. Targeted at industrial automation customers and OEMs.

Quantifiable outcome

• Targeting annual sales of 5,000 humanoid actuators within five years to significantly increase market share

Named customers1 record

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

One partnership is on record.

• CUREXOcoreStrategic or Co-development Partner · 12 March 2026SPG and CUREXO signed an MOU on March 12 at CUREXO's Seoul headquarters for SPG to supply precision actuators for CUREXO's medical robots. Under the agreement, SPG will be the primary supplier of precision actuators optimized for CUREXO's medical robot specifications. Both companies will collaborate on custom actuator design, technical exchanges, and joint marketing activities. The partnership aims to advance localization efforts while strengthening the market position of both companies in the medical robotics sector.

Scale indicators4 records

Recent moves5 records

Expansion highlights5 records

Direct peers

• Leaderdrive: Chinese manufacturer of harmonic reducers, RV reducers and planetary gearheads targeting robotics and CNC. A direct competitor to SPG across strain wave, cycloidal and planetary reducer categories.
• Zhejiang Shuanghuan Driveline: Chinese maker of RV reducers and precision gear components for industrial robots. Direct rival to SPG in cycloidal reducers, particularly aggressive on price in Asian markets.
• Hanwha Precision Machinery (now Hanwha Momentum): Korean manufacturer of gear reducers and precision motion components for robotics and defense. A direct domestic Korean competitor to SPG with overlapping product portfolio and similar customer base.

Others

• CUREXO: Korean medical robot developer (e.g., THINK Surgical-equivalent platforms) and SPG's MOU partner for medical-robot precision actuators. Adjacent — a customer and ecosystem participant rather than a motion component peer.

Emerging players

• ShinMaywa Industries: Japanese manufacturer of precision motion components and actuators expanding into humanoid and service robotics applications. Comparable in precision motion technology and humanoid-adjacent target end markets.

Regional players

• Drive Systems (Moventas, Santasalo): European industrial gear and drive systems specialist serving heavy industrial and wind applications. Comparable in geared-motor and precision gearing competency though oriented to different end markets.

Broad incumbents

• Sumitomo Heavy Industries (Drive Systems): Manufacturer of precision planetary gearheads (Hagglunds, Cyclo, Fine Cyclo) widely used in servo and robotics applications. Comparable to SPG's Precision Planetary Gearhead product line.
• Harmonic Drive Systems: Global leader in strain wave (harmonic) gear reducers for robotics and precision motion. Directly comparable to SPG's KSH Strain Wave Gear and robot actuator products, with deeper IP and a much larger global footprint.
• Nidec (Motion Control / Robot Actuators): Global motor and motion control giant actively expanding into robot actuators. Comparable to SPG across geared motors and emerging robot actuator modules, with vastly greater scale and R&D resources.
• Nabtesco: Japanese precision reducer manufacturer (cycloidal/RV reducers) supplying virtually every major industrial and collaborative robot maker. Directly comparable to SPG's KSR Cycloidal Robot Reducer in technology and target customers.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat3 records

Key risks5 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/spg-motor

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 SPG