Atum
Daily close in US$ at the latest USD/KRW close. Source: KRX via FinanceDataReader.
Atum makes compact, high-efficiency transformers, components that convert electrical voltage and current levels, used in consumer electronics and electric vehicles.
Its products include transformers for television power supplies, on-board chargers and DC-DC converters for electric vehicles, and related passive components such as line filters and film capacitors. Listed on KOSDAQ, Korea's tech-focused small-cap board, the company applies its own patented coil technologies, including moulded and laminated coil designs, across its transformer product range.
Summary is AI-generated and may contain errors · figures from DART filings
Atum in five facts
What does Atum do?
Atum makes compact, high-efficiency transformers, components that convert electrical voltage and current levels, used in consumer electronics and electric vehicles.
Where is Atum listed and in which sector?
Atum (Korean name: 에이텀) trades under KRX code 355690 on KOSDAQ, the Korea Exchange's board for smaller and growth companies. It is classified in the Information Technology sector, Components.
How large is Atum?
Its market capitalisation was US$51.6M on 2026-10-21, which puts it in this site's small-cap group. US$ amounts are converted from won at 1 USD ≈ ₩1,325 (2026-10-21).
What were Atum's latest annual revenue and operating profit?
For fiscal year 2025, Atum reported revenue of US$53.2M, an operating loss of US$4.9M and a net loss of US$6.4M, per its annual report on DART (data retrieved from DART on 2026-06-04). Revenue was up 244.6% on the previous year.
Where does this data come from?
Financial statements and filings come from DART, Korea's official corporate-filing system. Share prices, market capitalisation and trading status come from KRX. Company summaries are AI-generated from the filings and may contain errors; financial figures are mapped directly from DART.
Data sources and last updated
- Filings and financial statements
- DART (dart.fss.or.kr), Korea's official corporate-filing system
- Prices, market cap, trading status
- KRX (Korea Exchange), via FinanceDataReader
- Latest annual financials
- Fiscal year 2025, data retrieved from DART on 2026-06-04
- Share price and market cap
- Close of 2026-10-21
- Currency
- US$, 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.
- DisclosureOct 21
- Report on large shareholdings (5% rule) (abbreviated)Oct 12
- [Amended] Report on large shareholdings (5% rule) (abbreviated)Oct 12
- DisclosureOct 8
- Conversion price adjustmentSep 28
- Material event report (decision to redeem own convertible bonds early)
Atum Co., Ltd. decided to redeem US$724K face value of its 2nd series unsecured privately placed convertible bonds (part of a US$2.9M issue maturing February 27, 2028) for US$746K following the bondholder's exercise of a put option on August 27, 2026, planning to retire the acquired bonds and leaving US$507K face value outstanding.
Capital raise · Aug 27 - [Amended] Decision to acquire shares/equity in another company
Atum updated the disclosed terms of an acquisition of ATUM VINA CO., LTD., now worth US$5.24M.
M&A · Jul 31 · 3 versions - [Amended] Rights offering (paid-in capital increase) decision (subsidiary)
Atum Co., Ltd. amended its July 16, 2026 disclosure on a rights offering by its wholly owned Vietnamese subsidiary ATUM VINA CO., LTD., moving the payment date from August 3 to July 31, 2026; the US$5.24M (USD 5,000,000) in-kind, debt-to-equity rights offering leaves Atum's 100% ownership of the subsidiary unchanged.
Capital raise · Jul 31 · 3 versions - Subscription results of rights offering or equity-linked bonds (voluntary)Capital raise · Apr 24
- Rights offering: final issue price set (rights offering with public offering of forfeited shares)Capital raise · Apr 20
- [Amended] Material event report (rights offering)
Atum updated the terms of a new share issuance to raise US$9.5M, about 26.6% of its market value.
Capital raise · Apr 20 - [Amended] Material event report (rights offering)
Atum updated the terms of a new share issuance to raise US$9.37M, about 26.6% of its market value.
Capital raise · Mar 20 - Ex-rights (rights offering)Capital raise · Mar 13
- Rights offering: round 1 issue price setCapital raise · Mar 13
- [Amended] Material event report (rights offering)
Atum updated the terms of a new share issuance to raise US$7.64M, about 21.4% of its market value.
Capital raise · Mar 13 - [Amended] Material event report (rights offering)
Atum updated the terms of a new share issuance to raise US$7.81M, about 21.4% of its market value.
Capital raise · Feb 25 - Change of 30% or more in revenue or profit/loss structure (15% for large companies)
Atum reported consolidated results for FY2025: revenue of US$48.8M (+245.95% year on year), an operating loss of US$4.54M and a net loss of US$5.79M.
Earnings · Feb 20 - [Amended] Material event report (rights offering)
Atum updated the terms of a new share issuance to raise US$7.8M, about 17.3% of its market value.
Capital raise · Feb 13 - [Amended] Material event report (rights offering)Capital raise · Jan 30
- [Amended] Material event report (rights offering)Capital raise · Jan 26