---
schema_version: "secwatch.filing_event.v1"
accession: "0001683168-25-007018"
form_type: "8-K"
ticker: "ISCO"
cik: "0001355790"
company_name: "International Stem Cell CORP"
filed_at: "2025-09-16T23:59:59+00:00"
generated_at: "2026-05-17T06:28:51.877497+00:00"
event_type: "debt"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# International Stem Cell extends CEO loan of $2.5M to Sept 2026

## Summary
- Extended maturity of $2.5M promissory note from CEO Andrey Semechkin from Sept 15, 2025 to Sept 15, 2026.
- Original note was $2.7M issued Sept 2024; $200k repaid; outstanding principal $2.5M.
- Accrued and unpaid interest of $799,064.44 carried forward, does not accrue additional interest.
- Interest rate unchanged at 5.5% per annum; company may prepay without penalty.
- Company's Co-Chairman and CEO is the noteholder; related-party transaction.

## SEC filing metadata
- accession: 0001683168-25-007018
- form_type: 8-K
- ticker: ISCO
- cik: 0001355790
- company_name: International Stem Cell CORP
- filed_at: 2025-09-16T23:59:59+00:00
- event_type: debt
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 1.01, 2.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1355790/000168316825007018/0001683168-25-007018-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1355790/000168316825007018/intlstemcell_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001683168-25-007018
- JSON: https://secwatch.observer/filing/0001683168-25-007018.json
- Plain text: https://secwatch.observer/filing/0001683168-25-007018.txt

## Key facts
- Debt Financings
  International Stem Cell CORP amended loan of $2,500,000 with Dr. Andrey Semechkin at 5.5% per annum maturing September 15, 2026.
  - Instrument: loan
  - Principal: $2,500,000
  - Counterparty: Dr. Andrey Semechkin
  - Rate: 5.5% per annum
  - Maturity: September 15, 2026
  - Event: amendment
  source text: On September 15, 2025, International Stem Cell Corporation (the “Company”) and Dr. Andrey Semechkin agreed to extend (until September 15, 2026) the maturity date of the loan (in the principal amount of $2,500,000) from Dr. Semechkin to the Company that had been reflected in a promissory note dated September 15, 2024 (the “Original Note”), and which would have been due on September 15, 2024.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1355790/000168316825007018/0001683168-25-007018-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.