Seoul Semiconductor

서울반도체 · 046890

Information Technology Semiconductors · KOSDAQ

Small-cap

Market cap US$588.5M (₩812.2B)

Overview

Seoul Semiconductor makes LED components, the small light-emitting devices used in general lighting, automotive headlamps, and display backlighting, and packages them for supply to customers across those markets.

Listed on KOSDAQ, Korea's tech-focused stock exchange, it sits in the middle of the LED supply chain, taking chips and turning them into finished packaged components. Its core structural fact is that it sources LED chips from an affiliate, 서울바이오시스 (Seoul Viosys), and its primary business is the packaging and supply of those chips.

Summary is AI-generated and may contain errors · figures from DART filings

Financials

Source: DART · FY ending Dec · latest FY2025

Revenue · FY2025

US$734.4M

▼ −7.1% YoY

Operating profit · FY2025

−US$22.8M

Turned to loss

Net income · FY2025

−US$43.5M

Loss widened

Revenue, operating profit and net income by fiscal year (USD; KRW in parentheses).
Metric	FY2023	FY2024	FY2025
Revenue	US$748.1M(₩1T)	US$790.2M(₩1.1T)	US$734.4M(₩1T)
Operating profit	−US$35.8M(−₩49.4B)	US$577.3K(₩796.7M)	−US$22.8M(−₩31.5B)
Net income	−US$54M(−₩74.5B)	−US$1.4M(−₩1.9B)	−US$43.5M(−₩60B)

Revenue

FY2023US$748.1M
FY2024US$790.2M
FY2025US$734.4M

Operating profit

FY2023−US$35.8M
FY2024US$577.3K
FY2025−US$22.8M

Net income

FY2023−US$54M
FY2024−US$1.4M
FY2025−US$43.5M

Key ratios (FY2025)

ROE

-9.6%

Debt/Eq

76.1%

Op. margin

-3.1%

Net margin

-5.9%

Rev. YoY

▼ −7.1%

Why it matters

The company explicitly states it procures LED chips from its affiliate 서울바이오시스, making its supply chain directly tied to that related-party relationship.

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