SecuLetter
Daily close in US$ at the latest USD/KRW close. Source: KRX via FinanceDataReader.
SecuLetter develops security software that scans and blocks malicious content hidden inside digital files, such as documents and attachments, before they can harm an organisation's systems.
Its products cover email security, file transfer security, web-service file security, and cloud security, and are supplied to corporate and institutional customers. Listed on KOSDAQ, Korea's tech-focused small-cap exchange, the company's entire product portfolio is built on a proprietary platform it calls MARS, which uses automated reverse-engineering, the process of dismantling and analysing code to find hidden threats, as its core detection method.
Summary is AI-generated and may contain errors · figures from DART filings
SecuLetter in five facts
What does SecuLetter do?
SecuLetter develops security software that scans and blocks malicious content hidden inside digital files, such as documents and attachments, before they can harm an organisation's systems.
Where is SecuLetter listed and in which sector?
SecuLetter (Korean name: 시큐레터) trades under KRX code 418250 on KOSDAQ, the Korea Exchange's board for smaller and growth companies. It is classified in the Information Technology sector, Software.
How large is SecuLetter?
Its market capitalisation was US$35.9M on 2026-10-21, which puts it in this site's small-cap group. US$ amounts are converted from won at 1 USD ≈ ₩1,325 (2026-10-21).
What were SecuLetter's latest annual revenue and operating profit?
For fiscal year 2025, SecuLetter reported revenue of US$882K, an operating loss of US$3.2M and a net loss of US$3.2M, per its annual report on DART (data retrieved from DART on 2026-09-17). Revenue was down 17.2% on the previous year.
Where does this data come from?
Financial statements and filings come from DART, Korea's official corporate-filing system. Share prices, market capitalisation and trading status come from KRX. Company summaries are AI-generated from the filings and may contain errors; financial figures are mapped directly from DART.
Data sources and last updated
- Filings and financial statements
- DART (dart.fss.or.kr), Korea's official corporate-filing system
- Prices, market cap, trading status
- KRX (Korea Exchange), via FinanceDataReader
- Latest annual financials
- Fiscal year 2025, data retrieved from DART on 2026-09-17
- Share price and market cap
- Close of 2026-10-21
- Currency
- US$, 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.
- Material event report (convertible bonds)
SecuLetter disclosed convertible bonds to raise US$1.36M, about 4.2% of its market value.
Capital raise · Apr 30 - Other material management matterCapital raise · Apr 29
- [Amended] Material event report (rights offering)Capital raise · Apr 29 · 5 versions
- [Amended] Supply contract signed
SecuLetter updated a previously disclosed supply contract with CMT Information & Communications Co., Ltd., now worth US$545K, about 56.8% of its recent annual revenue, running through Apr 2027.
Supply contract · Apr 28 · 2 versions - [Attachment amended] Material event report (rights offering)Capital raise · Mar 17
- Change of 30% or more in revenue or profit/loss structure (15% for large companies)
SecuLetter reported separate results for FY2025: revenue of US$814K (−17.44% year on year), an operating loss of US$2.99M and a net loss of US$2.96M.
Earnings · Feb 27 - [Attachment amended] Material event report (rights offering)Capital raise · Jan 13
- [Amended] Material event report (rights offering)Capital raise · Jan 13
- [Amended] Material event report (rights offering)Capital raise · Jan 7