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KOSTECSYS. CO., LTD. — Investor Relations & Filings

Ticker · 355150 ISIN · KR7355150004 KO Manufacturing
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Filings indexed 199 across all filing types
Latest filing 2026-05-28 Major Shareholding Noti…
Country KR South Korea
Listing KO 355150

About KOSTECSYS. CO., LTD.

https://www.kostec.net/en/

KOSTECSYS is a manufacturer of advanced thermal management and packaging solutions for the semiconductor industry. The company specializes in components for next-generation power semiconductors, including SiC and GaN devices, leveraging its proprietary KCMC® low-thermal expansion, high-heat dissipation materials. Its core products include thermal matching packages, heat spreaders, base plates, spacers, and liquid cold plates. KOSTECSYS also provides specialized packages for high-power laser diodes, photonic integrated circuits, and high-frequency MMICs, as well as components such as current sensor shunt resistors.

Recent filings

Filing Released Lang Actions
주식등의대량보유상황보고서(약식)
Major Shareholding Notification Classification · 92% confidence The document is a Korean ‘주식등의 대량보유상황보고서(약식)’ — a report of large shareholdings and changes in share ownership by a significant shareholder (Morgan Stanley & Co. International plc). It details number of shares, ownership percentage, transaction history, reporting dates, and legal references for large shareholding filings. This matches the definition of a Major Shareholding Notification (MRQ).
2026-05-28 Korean
분기보고서 (2026.03)
Interim / Quarterly Report Classification · 94% confidence The document is titled “분기보고서” covering the period 2026-01-01 to 2026-03-31 and contains detailed company overview, business segment analysis, product definitions, and other substantive quarterly reporting content. This aligns with an Interim/Quarterly Report rather than an announcement or summary. Therefore, it is classified as IR (Interim/Quarterly Report). Q1 2026
2026-05-15 Korean
임원ㆍ주요주주특정증권등소유상황보고서
Director's Dealing Classification · 88% confidence The document is titled “임원ㆍ주요주주 특정증권등 소유상황보고서” (Report on Ownership Status of Certain Securities by Executive/Major Shareholder) and is a regulatory filing disclosing detailed share ownership and transaction changes by an executive (허만인). It includes actual share counts before and after the change, transaction dates, and disposals/purchases. This corresponds to insider/director share transactions, fitting the Director’s Dealing (DIRS) category.
2026-05-14 Korean
기업설명회(IR)개최
Investor Presentation Classification · 75% confidence The document is an announcement of a corporate investor relations event (기업설명회 IR) with details on date, venue, participants, purpose, and content. This is not a full financial report or earnings release but specifically pertains to an investor presentation event. Therefore, it should be classified as Investor Presentation (Code IP).
2026-04-13 Korean
사외이사의선임ㆍ해임또는중도퇴임에관한신고
Board/Management Information Classification · 95% confidence The document is titled “사외이사의 선임ㆍ해임 또는 중도퇴임에 관한 신고,” which is a formal notification to the Financial Services Commission/KRX regarding the appointment, dismissal or mid-term resignation of an outside (independent) director. It provides details of board composition changes, dates, and director profiles. This clearly falls under announcements of changes in the company’s board of directors or senior management. Therefore, it should be classified as Board/Management Information (MANG).
2026-03-27 Korean
정기주주총회결과
Declaration of Voting Results & Voting Rights Announcements Classification · 95% confidence The document is titled “정기주주총회 결과” (Regular Shareholders’ Meeting Results) and details each agenda item’s voting results (approval of financials, board appointments, etc.) with vote counts and percentages. It reports the outcome of an AGM rather than calling the meeting or presenting full financial reports. This matches the definition for Declaration of Voting Results & Voting Rights Announcements (Code: DVA).
2026-03-26 Korean

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