Lightron Fiber-Optic Devices
Daily close in US$ at the latest USD/KRW close. Source: KRX via FinanceDataReader.
Lightron Fiber-Optic Devices makes optical transceiver modules, small components that convert electrical signals into light pulses and back, allowing data to travel at high speed over fiber-optic cables.
Listed on KOSDAQ, Korea's tech-focused small-cap board, it supplies these modules to wireless mobile base stations, telecom and data-networking equipment makers, cable TV operators, fiber-to-the-home networks, and high-definition broadcast systems. Its product mix spans modules for current-generation mobile networks through high-capacity data-center interconnects, and it is actively expanding into the defense sector alongside its commercial business.
Summary is AI-generated and may contain errors · figures from DART filings
The company is extending its reach into the defense industry through collaboration with Korean defense contractors, a relatively new business line alongside its established telecom-module operations.
Lightron Fiber-Optic Devices in five facts
What does Lightron Fiber-Optic Devices do?
Lightron Fiber-Optic Devices makes optical transceiver modules, small components that convert electrical signals into light pulses and back, allowing data to travel at high speed over fiber-optic cables.
Where is Lightron Fiber-Optic Devices listed and in which sector?
Lightron Fiber-Optic Devices (Korean name: 빛과전자) trades under KRX code 069540 on KOSDAQ, the Korea Exchange's board for smaller and growth companies. It is classified in the Information Technology sector, Hardware & Devices.
How large is Lightron Fiber-Optic Devices?
Its market capitalisation was US$320.7M on 2026-10-21, which puts it in this site's small-cap group. US$ amounts are converted from won at 1 USD ≈ ₩1,325 (2026-10-21).
What were Lightron Fiber-Optic Devices's latest annual revenue and operating profit?
For fiscal year 2025, Lightron Fiber-Optic Devices reported revenue of US$24M, an operating loss of US$12.5M and a net loss of US$14.8M, per its annual report on DART (data retrieved from DART on 2026-09-17). Revenue was up 75.2% on the previous year.
Where does this data come from?
Financial statements and filings come from DART, Korea's official corporate-filing system. Share prices, market capitalisation and trading status come from KRX. Company summaries are AI-generated from the filings and may contain errors; financial figures are mapped directly from DART.
Data sources and last updated
- Filings and financial statements
- DART (dart.fss.or.kr), Korea's official corporate-filing system
- Prices, market cap, trading status
- KRX (Korea Exchange), via FinanceDataReader
- Latest annual financials
- Fiscal year 2025, data retrieved from DART on 2026-09-17
- Share price and market cap
- Close of 2026-10-21
- Currency
- US$, converted from won at 1 USD ≈ ₩1,325 (2026-10-21 close)
- Company data updated
- 2026-10-21
- Company summary
- AI-generated from filings; may contain errors. Information only, not investment advice.
- [Amended] Resolution to convene a general shareholders' meeting (extraordinary meeting)Oct 16
- [Amended] Shareholder register closure / record date setOct 16
- Report on securities held by executives/major shareholdersOct 15
- Report on large shareholdings (5% rule) (standard)Oct 15
- Report on large shareholdings (5% rule) (standard)Oct 8
- Material event report (convertible bonds)
Lightron Fiber-Optic Devices disclosed convertible bonds to raise US$2.24M, about 0.5% of its market value.
Capital raise · Oct 7 - Report on large shareholdings (5% rule) (standard)Sep 17
- Report on securities held by executives/major shareholdersSep 4
- Report on large shareholdings (5% rule) (standard)Sep 4
- Material event report (decision to redeem own convertible bonds early)
Lightron Fiber-Optic Devices Co., Ltd. will acquire, before maturity, the full US$5.63M face amount of its Series 17 private convertible bonds from Baro Savings Bank Co., Ltd. for US$5.7M (principal plus a 6.50% guaranteed yield), funded from Series 18 CB subscription proceeds, reducing the outstanding face balance to zero; the company will later decide by board resolution whether to resell or retire the bonds.
Capital raise · Aug 5 - [Amended] Material event report (convertible bonds)
Lightron Fiber-Optic Devices updated the terms of convertible bonds to raise US$11.1M, about 2.8% of its market value.
Capital raise · Jul 29 · 4 versions - Completion report on merger, etc. (merger)
Lightron Fiber-Optic Devices Co., Ltd. completed its small-scale merger absorbing Seyoung Technology Co., Ltd. effective July 22, 2026, issuing no new shares (merger ratio 1.0000000:0.0000000) and with no change in major shareholders' holdings.
M&A · Jul 22 - [Attachment amended] Material event report (merger)M&A · Jun 5
- [Attachment amended] Material event report (merger)M&A · May 21
- Material event report (merger)M&A · May 20
- Material event report (CB call option holder designated)Capital raise · May 15
- Material event report (convertible bonds)
Lightron Fiber-Optic Devices disclosed convertible bonds to raise US$5.36M, about 1.4% of its market value.
Capital raise · May 15 - Material event reportCapital raise · Apr 30
- Material event report (CB call option holder designated)Capital raise · Apr 20
- [Amended] Material event report (convertible bonds)
Lightron Fiber-Optic Devices updated the terms of convertible bonds to raise US$3.38M, about 0.9% of its market value.
Capital raise · Apr 17 · 4 versions - [Amended] Material event report (rights offering)
Lightron Fiber-Optic Devices updated the terms of a private placement (third-party allotment) to raise US$15.1M, about 4.9% of its market value.
Capital raise · Feb 10 - Change of 30% or more in revenue or profit/loss structure (15% for large companies)
Lightron Fiber-Optic Devices reported consolidated results for FY2025: revenue of US$21.9M (+75.2% year on year), an operating loss of US$11.4M and a net loss of US$14M.
Earnings · Feb 2 - [Amended] Share-pledge agreement that may change the largest shareholderOwnership change · Jan 30
- Share-pledge agreement that may change the largest shareholderOwnership change · Jan 30
- Change of largest shareholderOwnership change · Jan 29
- Securities issuance results (voluntary) (third-party placement)Capital raise · Jan 29
- [Amended] Material event report (rights offering)Capital raise · Jan 29
- Material event report (convertible bonds)Capital raise · Jan 7