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Heartseed Inc. — Investor Relations & Filings

Ticker · 219A ISIN · JP3765140003 T Professional, scientific and technical activities
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Filings indexed 12 across all filing types
Latest filing 2026-03-26 Regulatory Filings
Country JP Japan
Listing T 219A

About Heartseed Inc.

https://heartseed.jp/

Heartseed Inc. is a clinical-stage biotechnology company pioneering regenerative medicine for severe heart failure. The company's core technology involves the creation of high-purity cardiomyocytes (heart muscle cells) from induced pluripotent stem cells (iPS cells) to achieve cardiac 'remuscularization.' Its lead pipeline candidate, HS-001, is an allogeneic iPS cell-derived cardiomyocyte therapy administered via intramyocardial injection. This treatment is being developed for patients with heart failure with reduced ejection fraction (HFrEF), including those with dilated cardiomyopathy or old myocardial infarction, offering a potential alternative to heart transplantation. Heartseed is also advancing next-generation research using autologous and HLA-edited iPS cells to improve treatment outcomes.

Recent filings

Filing Released Lang Actions
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 company's 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 10
2026-03-26 Japanese
有価証券報告書－第10期(2024/11/01－2025/12/31)
Annual Report Classification · 100% confidence The document is a 'Yuka Shoken Hokokusho' (Securities Report), which is the Japanese equivalent of a 10-K. It contains comprehensive financial statements, business descriptions, management analysis, and audit information for the fiscal period ending December 31, 2025. It is a formal regulatory filing submitted to the Kanto Local Finance Bureau, not an announcement or a summary. FY 2025
2026-03-26 Japanese
臨時報告書
Major Shareholding Notification Classification · 100% confidence The document is explicitly titled "臨時報告書" (Extraordinary Report or Timely Disclosure Report) and is submitted to the Kanto Local Finance Bureau (関東財務局) on June 19, 2025. The content details a change in a major shareholder (SBI Ventures Two株式会社) ceasing to be a major shareholder due to a change in the total number of outstanding shares used as the denominator, referencing the Financial Instruments and Exchange Act (金融商品取引法). This type of filing, which reports significant, non-periodic corporate events like changes in major shareholdings, aligns best with the definition of a general regulatory announcement or a specific filing for major shareholding changes. Since the document explicitly reports a change in significant share ownership levels (crossing thresholds, even if it's ceasing to be a major shareholder), the most specific code is MRQ (Major Shareholding Notification). Although it is a formal regulatory filing, MRQ is more precise than the general RNS.
2025-06-19 Japanese
確認書
Report Publication Announcement Classification · 100% confidence The document text contains a header "第２四半期報告書" (Second Quarter Report) and explicitly mentions the reporting period ("第10期中（自2024年11月１日 至2025年４月30日）"). It also includes confirmation statements regarding the appropriateness of the filing content, which is characteristic of a formal periodic financial report. The filing date is June 12, 2025, covering a period ending April 30, 2025. This structure strongly indicates a comprehensive financial report for a period shorter than a year, which corresponds to the Interim / Quarterly Report (IR) definition. Although it contains confirmation elements, the core content is the report itself, not just an announcement of its publication (RPA/RNS). The document length is very short (565 chars), but the content is clearly the substance of a confirmation related to the quarterly report, making IR the most appropriate classification over RPA/RNS, which are usually just announcements stating the report is attached.
2025-06-12 Japanese
半期報告書－第10期(2024/11/01－2025/12/31)
Interim / Quarterly Report Classification · 100% confidence The document is a '半期報告書' (Semi-Annual Report) for Heartseed Inc., covering the fiscal period from November 1, 2024, to April 30, 2025. It contains detailed financial statements (Balance Sheet, Income Statement, Cash Flow Statement) and management analysis, which aligns with the definition of an Interim/Quarterly Report (IR). It is not an announcement of a report, as it contains the full financial data. H1 2025
2025-06-12 Japanese
臨時報告書
AGM Information Classification · 100% confidence The document is titled "臨時報告書" (Extraordinary Report/Timely Disclosure Report) and is submitted to the Kanto Local Finance Bureau Director. Section 1 explicitly states the reason for filing: '...決議事項が決議されましたので...本臨時報告書を提出するものであります' (Because the resolution matters were resolved... this extraordinary report is being submitted). Section 2 details the results of a general shareholders' meeting held on January 24, 2025, including resolutions passed regarding articles of incorporation changes and director compensation. This structure—a formal report detailing the results of a shareholder vote—aligns perfectly with the definition of reporting voting results from a general meeting. The closest specific category is 'Declaration of Voting Results & Voting Rights Announcements' (DVA).
2025-01-27 Japanese

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