Koyj
Daily close in US$ at the latest USD/KRW close. Source: KRX via FinanceDataReader.
Koyj makes coated optical films, thin sheets applied inside the backlight units of LCD screens to spread light evenly and reduce glare, and supplies them to LCD display manufacturers.
It also operates subsidiaries that produce metal-cast automotive parts and electronic organic and inorganic materials, including inputs for secondary-battery cathodes and semiconductor and display applications. Listed on KOSDAQ, Korea's tech and small-cap board, Koyj's core business is optical film coating, where it mixes its own coating solutions in-house rather than purchasing ready-made formulas, a process it says lowers production costs.
Summary is AI-generated and may contain errors · figures from DART filings
Koyj's electronic materials subsidiary, Koyj Advanced Materials, was spun off from its own in-house electronic organic materials division and now develops battery and semiconductor materials separately.
Koyj in five facts
What does Koyj do?
Koyj makes coated optical films, thin sheets applied inside the backlight units of LCD screens to spread light evenly and reduce glare, and supplies them to LCD display manufacturers.
Where is Koyj listed and in which sector?
Koyj (Korean name: 코이즈) trades under KRX code 121850 on KOSDAQ, the Korea Exchange's board for smaller and growth companies. It is classified in the Materials sector, Chemicals. It is no longer listed.
How large is Koyj?
Its market capitalisation was US$7.4M on 2026-09-11, which puts it in this site's small-cap group. US$ amounts are converted from won at 1 USD ≈ ₩1,325 (2026-10-21).
What were Koyj's latest annual revenue and operating profit?
For fiscal year 2025, Koyj reported revenue of US$9.5M, an operating loss of US$6.1M and a net loss of US$8.3M, per its annual report on DART (data retrieved from DART on 2026-09-17). Revenue was down 39.0% on the previous year.
Where does this data come from?
Financial statements and filings come from DART, Korea's official corporate-filing system. Share prices, market capitalisation and trading status come from KRX. Company summaries are AI-generated from the filings and may contain errors; financial figures are mapped directly from DART.
Data sources and last updated
- Filings and financial statements
- DART (dart.fss.or.kr), Korea's official corporate-filing system
- Prices, market cap, trading status
- KRX (Korea Exchange), via FinanceDataReader
- Latest annual financials
- Fiscal year 2025, data retrieved from DART on 2026-09-17
- Share price and market cap
- Close of 2026-09-11
- Currency
- US$, converted from won at 1 USD ≈ ₩1,325 (2026-10-21 close)
- Company data updated
- 2026-09-18
- Company summary
- AI-generated from filings; may contain errors. Information only, not investment advice.
- Report on large shareholdings (5% rule) (standard)Sep 11
- Trading suspensionSep 1
- [Attachment amended] Material event report (convertible bonds)Capital raise · May 28
- [Amended] Material event report (convertible bonds)
Koyj updated the terms of convertible bonds to raise US$664K, about 10.1% of its market value.
Capital raise · May 26 · 2 versions - Material event report (equity acquisition)M&A · May 21
- [Amended] Supply contract signed (voluntary)
Koyj updated a previously disclosed supply contract, now worth US$809K, about 5.8% of its recent annual revenue, running through Mar 2026.
Supply contract · Apr 29 · 2 versions - Treasury share disposal: results reportTreasury Shares · Apr 29
- Operating results (preliminary) (fair disclosure)
Koyj filed provisional (unaudited) separate results for Q1 2026: revenue of US$3.29M (+22.9% year on year), operating profit of US$71K (from a loss a year earlier) and net income of US$268K (from a loss a year earlier).
Earnings · Apr 6 - Change of 30% or more in revenue or profit/loss structure (15% for large companies)
Koyj reported consolidated results for FY2025: revenue of US$8.55M (−38.99% year on year), an operating loss of US$5.46M and a net loss of US$7.46M.
Earnings · Mar 6 - Material event report (treasury share disposal)
Koyj disclosed a plan to sell treasury shares worth US$44K, about 0.7% of its market value.
Treasury Shares · Mar 6 - Subscription results of rights offering or equity-linked bonds (voluntary)Capital raise · Jan 28
- Rights offering: final issue price setCapital raise · Jan 22
- [Amended] Material event report (rights offering)Capital raise · Jan 22