CS
Daily close in US$ at the latest USD/KRW close. Source: KRX via FinanceDataReader.
CS makes mobile signal repeaters, devices that pick up weak wireless signals in coverage dead zones and rebroadcast them so mobile users can make calls and use data anywhere.
It supplies these units to mobile network operators, with SK Telecom as its primary domestic customer and NTT DoCoMo among its key customers in Japan. Listed on KOSDAQ, Korea's tech-focused small-cap board, the company operates entirely within this single product line and has been supplying both fiber-optic and radio-frequency repeaters for fifth-generation mobile networks.
Summary is AI-generated and may contain errors · figures from DART filings
CS operates through subsidiaries and has a local entity in the United States targeting entry into that market alongside its established domestic and Japanese customer relationships.
CS in five facts
What does CS do?
CS makes mobile signal repeaters, devices that pick up weak wireless signals in coverage dead zones and rebroadcast them so mobile users can make calls and use data anywhere.
Where is CS listed and in which sector?
CS (Korean name: CS) trades under KRX code 065770 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 CS?
Its market capitalisation was US$6.9M on 2026-10-21, which puts it in this site's small-cap group. US$ amounts are converted from won at 1 USD ≈ ₩1,325 (2026-10-21).
What were CS's latest annual revenue and operating profit?
For fiscal year 2025, CS reported revenue of US$17.8M, an operating loss of US$892.7K and a net loss of US$753.6K, per its annual report on DART (data retrieved from DART on 2026-09-17). Revenue was down 36.4% on the previous year.
Where does this data come from?
Financial statements and filings come from DART, Korea's official corporate-filing system. Share prices, market capitalisation and trading status come from KRX. Company summaries are AI-generated from the filings and may contain errors; financial figures are mapped directly from DART.
Data sources and last updated
- Filings and financial statements
- DART (dart.fss.or.kr), Korea's official corporate-filing system
- Prices, market cap, trading status
- KRX (Korea Exchange), via FinanceDataReader
- Latest annual financials
- Fiscal year 2025, data retrieved from DART on 2026-09-17
- Share price and market cap
- Close of 2026-10-21
- Currency
- US$, 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.
- Other market noticeOct 7
- Material event report (decision to redeem own convertible bonds early)
CS Co., Ltd. decided on August 28, 2026 to acquire before maturity US$3.62M in face value of its Series 6 private-placement convertible bonds, paying US$3.64M in principal and interest after bondholders exercised early-redemption rights triggered by the company's designation as a KOSDAQ administrative issue.
Capital raise · Aug 28 - Supply contract signed (voluntary)
CS disclosed a supply contract with SK Telecom, worth US$912K, about 5.36% of its recent annual revenue, running through Dec 2026.
Supply contract · Aug 21 - [Amended] Material event report (rights offering)
CS updated the terms of a private placement (third-party allotment) to raise US$1.02M, about 14.2% of its market value.
Capital raise · Jul 22 · 2 versions - Completion report on merger, etc. (asset transfer)
CS Co., Ltd. reports completion of its May 7, 2026 acquisition of all 25,400 shares (100%) of Mirae Information Technology Co., Ltd. for US$13.6M, with the final balance paid and the transaction closed as of July 20, 2026.
M&A · Jul 20 - [Amended] Material event report (equity acquisition)
CS Co., Ltd. amended its May 7, 2026 report on its US$16.9M acquisition of 100% of Mirae Information Technology Co., Ltd., moving up the closing date from August 6, 2026 to July 20, 2026 and adjusting the related loan period accordingly.
M&A · Jul 16 - [Amended] Material event report (equity acquisition)M&A · Jul 2 · 2 versions
- [Amended] Material event report (convertible bonds)
CS updated the terms of convertible bonds to raise US$3.34M, about 47.4% of its market value.
Capital raise · May 28 · 2 versions - [Attachment amended] Material event report (convertible bonds)Capital raise · May 26
- [Attachment amended] Material event report (convertible bonds)Capital raise · May 22
- Trading suspension (share consolidation/split registration)M&A · Apr 22
- Change of 30% or more in revenue or profit/loss structure (15% for large companies)
CS reported consolidated results for FY2025: revenue of US$16.1M (−36.4% year on year), an operating loss of US$804K and a net loss of US$679K (from a profit a year earlier).
Earnings · Feb 6