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D.I.System Co.,Ltd. — Investor Relations & Filings

Ticker · 4421 ISIN · JP3548810005 T Telecommunications, computer programming, consultancy, computing infrastructure, and other information service activities
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Filings indexed 50 across all filing types
Latest filing 2026-05-14 Regulatory Filings
Country JP Japan
Listing T 4421

About D.I.System Co.,Ltd.

https://www.di-system.co.jp/

D.I.System Co., Ltd. is an information technology services provider specializing in system integration, education, and security solutions. The company engages in system development and IT infrastructure construction, including network services and Microsoft solutions, aimed at improving corporate operational efficiency. A key focus is on modernizing internal business systems to streamline workflows, resolve common IT frustrations, and support work style reforms. In addition to its integration services, the company offers comprehensive security solutions to safeguard digital assets and provides education services to enhance technical skills and IT literacy within client organizations.

Recent filings

Filing Released Lang Actions
確認書
Regulatory Filings Classification · 95% confidence The document is a Japanese “半期報告書” confirmation (確認書) under the Financial Instruments and Exchange Act, Article 24-5-2, in which the President and CFO certify that the mid-term report is properly described. It contains no actual interim financial statements or data—only an officer attestation. Per the Certification Rule, an attestation or confirmation letter referencing a report is classified as a Regulatory Filing (RNS), not as an Interim/Quarterly Report.
2026-05-14 Japanese
半期報告書－第30期(2025/10/01－2026/09/30)
Interim / Quarterly Report Classification · 91% confidence The document is titled “半期報告書” (Half‐year Report) filed under Article 24‐5 of Japan’s Financial Instruments and Exchange Act, covering the interim period October 1, 2025 to March 31, 2026. It contains full interim consolidated financial statements (balance sheet, income statement, cash flows), management discussion & analysis, segment results, corporate and shareholding details, and XBRL tags. This is a substantive half‐year financial report, not merely an announcement or attachment notice. Accordingly, it is classified as an Interim / Quarterly Report (IR). H1 2026
2026-05-14 Japanese
当社連結子会社による株式取得（孫会社化）に関するお知らせ
Regulatory Filings
2026-04-14 Japanese
訂正臨時報告書
M&A Activity Classification · 100% confidence The document is a 'Temporary Report' (臨時報告書) filed with the Kanto Local Finance Bureau in Japan. It details the acquisition of a subsidiary (株式会社エム・アイ・シー) by the company (株式会社ディ・アイ・システム), including the purpose, financial data of the target, and the transaction schedule. In the context of Japanese corporate filings, this is a regulatory disclosure regarding M&A activity. Since the filing category 'M&A Activity' (TAR) is specifically defined for merger proposals or takeover bids, this document fits that category perfectly.
2025-12-24 Japanese
確認書
Regulatory Filings Classification · 100% confidence The document is titled '確認書' (Confirmation Letter) and explicitly states it is filed under the Financial Instruments and Exchange Act Article 24-4-2. It serves as an officer certification confirming the accuracy of the contents of the Annual Securities Report (有価証券報告書). According to the 'CERTIFICATION RULE', documents that are primarily officer certifications or attestations should be classified as Regulatory Filings (RNS), even if they reference a specific report type. FY 2025
2025-12-23 Japanese
有価証券報告書－第29期(2024/10/01－2025/09/30)
Annual Report Classification · 100% confidence The document is a Japanese 'Yuka Shoken Hokokusho' (Securities Report), which is the Japanese equivalent of a 10-K annual report. It contains comprehensive financial statements, management discussion, and business performance data for the fiscal year ending September 30, 2025. It is a formal regulatory filing submitted to the Kanto Local Finance Bureau, not an announcement or a summary. FY 2025
2025-12-23 Japanese

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