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Occurring Fact219AHeartseed Inc.Pharmaceuticals

Notice regarding the first administration in the ischemic heart disease cohort of the Phase 1/2 company-sponsored clinical trial of cardiac regenerative medicine HS-005 (catheter administration)

In the EMERALD trial of HS-005, the first patient in the ischemic heart disease cohort with severe heart failure was dosed. Based on data from 4 weeks after dosing, the Independent Safety Evaluation Committee approved continuation of the clinical trial in the cohort.

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First administration in the ischemic heart disease cohort of the Phase 1/2 company-sponsored clinical trial of cardiac regenerative medicine HS-005 (catheter administration)

Subject Entity

Heartseed Inc. (the Company)

Target Locations / Products

HS-005 (allogeneic iPS cell-derived cardiomyocyte spheroids; administration using a catheter or other device) / EMERALD trial / ischemic heart disease cohort

This disclosure10/27/2026
Impact on Earnings Forecast

There is no change to the earnings forecast for the fiscal year ending December 2026.

Company response

Investigation structure

The Independent Safety Evaluation Committee approved continuation of the clinical trial in the cohort based on data from 4 weeks after dosing (chairperson's name and establishment date: Not disclosed)

Outlook

Following approval by the Independent Safety Evaluation Committee, the clinical trial in the ischemic heart disease cohort will continue.

Event that occurred
ItemDetails
Event nameFirst administration in the ischemic heart disease cohort of the Phase 1/2 company-sponsored clinical trial of cardiac regenerative medicine HS-005 (catheter administration)
Subject EntityHeartseed Inc. (the Company)
Target Locations / ProductsHS-005 (allogeneic iPS cell-derived cardiomyocyte spheroids; administration using a catheter or other device) / EMERALD trial / ischemic heart disease cohort
Impact on Earnings ForecastThere is no change to the earnings forecast for the fiscal year ending December 2026.
Investigation structureThe Independent Safety Evaluation Committee approved continuation of the clinical trial in the cohort based on data from 4 weeks after dosing (chairperson's name and establishment date: Not disclosed)
OutlookFollowing approval by the Independent Safety Evaluation Committee, the clinical trial in the ischemic heart disease cohort will continue.
Items this document does not state (19)
Date of occurrenceDate recognized / date notice receivedCauseAmount of Impact on Business PerformanceAccounting period in which recognizedType of litigation or proceedingCourt or authorityPlaintiffDefendantDate of filing / date of actionClaim amount / surcharge amountAmount of receivables at risk of non-collection or delayed collectionSuspended operationsScheduled resumption dateMeasures to prevent recurrenceDirectors' and officers' liabilityVoting rights ownership percentage before the changeVoting rights ownership percentage after the changePlanned follow-up disclosure

These are items the company does not state in this document. We do not leave them blank, nor fill them in from other sources or by inference.

The reasons the company gives

The company's own explanation, not something inferred from the numbers.

The Independent Safety Evaluation Committee approved continuation of the clinical trial in the cohort based on data from 4 weeks after dosing.

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Notice regarding the first administration in the ischemic heart disease cohort of the Phase 1/2 company-sponsored clinical trial of cardiac regenerative medicine HS-005 (catheter administration) | Heartseed Inc. (219A) timely disclosure | Komori