S-1
Daily close in US$ at the latest USD/KRW close. Source: KRX via FinanceDataReader.
S-1 provides security and building-management services, from alarm monitoring and on-site response teams to cybersecurity software and full-service property management, for homes, commercial buildings, and large industrial facilities across South Korea.
Its customers range from individual households to major corporations and property owners. Listed on KOSPI, South Korea's main stock exchange, the company operates two roughly equal revenue streams: a physical and digital security division, and an infrastructure division covering facility management, property management, and security system integration.
Summary is AI-generated and may contain errors · figures from DART filings
The company draws on over six decades of accumulated expertise in the Korean security and property-management market, giving it a long-established nationwide service and response network.
S-1 in five facts
What does S-1 do?
S-1 provides security and building-management services, from alarm monitoring and on-site response teams to cybersecurity software and full-service property management, for homes, commercial buildings, and large industrial facilities across South Korea.
Where is S-1 listed and in which sector?
S-1 (Korean name: 에스원) trades under KRX code 012750 on KOSPI, the main board of the Korea Exchange. It is classified in the Industrials sector, Commercial Services.
How large is S-1?
Its market capitalisation was US$2.8B on 2026-10-21, which puts it in this site's large-cap group. US$ amounts are converted from won at 1 USD ≈ ₩1,325 (2026-10-21).
What were S-1's latest annual revenue and operating profit?
For fiscal year 2025, S-1 reported revenue of US$2.2B, operating profit of US$177M and net income of US$134.8M, per its annual report on DART (data retrieved from DART on 2026-09-08). Revenue was up 3.0% on the previous year.
Where does this data come from?
Financial statements and filings come from DART, Korea's official corporate-filing system. Share prices, market capitalisation and trading status come from KRX. Company summaries are AI-generated from the filings and may contain errors; financial figures are mapped directly from DART.
Data sources and last updated
- Filings and financial statements
- DART (dart.fss.or.kr), Korea's official corporate-filing system
- Prices, market cap, trading status
- KRX (Korea Exchange), via FinanceDataReader
- Latest annual financials
- Fiscal year 2025, data retrieved from DART on 2026-09-08
- Share price and market cap
- Close of 2026-10-21
- Currency
- US$, 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] DisclosureOct 20
- [Amended] DisclosureOct 20
- [Amended] DisclosureOct 16
- [Amended] DisclosureOct 16
- DisclosureOct 15
- DisclosureOct 15
- DisclosureOct 15
- Matter subject to ad-hoc disclosure (fair disclosure)Oct 14
- Operating results (consolidated) (preliminary) (fair disclosure)
S-1 filed provisional (unaudited) consolidated results for Q3 2026: revenue of US$535M (+2.57% year on year), operating profit of US$48.8M (+5.26% year on year) and net income of US$36.9M (+2.55% year on year).
Earnings · Oct 14 - Material event report (treasury share acquisition)
S-1 disclosed a plan to buy back its own shares worth US$337M, about 13.6% of its market value.
Treasury Shares · Oct 14 - Supply contract signed
S-1 disclosed a supply contract with Samsung Electronics, worth US$75.5M, about 3.53% of its recent annual revenue, running through Sep 2029.
Supply contract · Sep 29 - [quarterly, individual company] Large business group status disclosureAug 31
- Operating results (consolidated) (preliminary) (fair disclosure)
S-1 filed provisional (unaudited) consolidated results for Q2 2026: revenue of US$509M (−1.3% year on year), operating profit of US$45.3M (+4.61% year on year) and net income of US$32.9M (−10.25% year on year).
Earnings · Jul 31 - Supply contract signed
S-1 disclosed a supply contract with Samsung Electronics, worth US$103M, about 5.37% of its recent annual revenue, running through Dec 2026.
Supply contract · Jun 15 - Operating results (consolidated) (preliminary) (fair disclosure)
S-1 filed provisional (unaudited) consolidated results for Q1 2026: revenue of US$457M (−0.06% year on year), operating profit of US$14.1M (−62.32% year on year) and net income of US$14.6M (−48.76% year on year).
Earnings · Apr 30 - Cash/in-kind dividend decisionDividend · Jan 29
- Operating results (consolidated) (preliminary) (fair disclosure)Earnings · Jan 29