---
schema_version: "secwatch.filing_event.v1"
accession: "0001683168-23-006510"
form_type: "8-K"
ticker: "ISCO"
cik: "0001355790"
company_name: "International Stem Cell CORP"
filed_at: "2023-09-18T23:59:59+00:00"
generated_at: "2026-06-10T14:33:53.749216+00:00"
event_type: "debt"
sentiment: "neutral"
materiality_score: 0.45
calibrated_materiality_score: 0.45
confidence: "high"
source: SEC EDGAR
---

# International Stem Cell extends $2.9M CEO loan maturity to Sept 2024

## Summary
- CEO Andrey Semechkin extended $2.9M promissory note maturity from Sept 15, 2023 to Sept 15, 2024.
- Interest rate set at 4.5% per annum; note is unsecured and non-convertible.
- Accrued unpaid interest on original note was approximately $518,100 as of issuance date.
- Borrower may prepay the note in whole or part without penalty at any time.
- Note issued in exchange for original March 15, 2023 promissory note that was maturing.

## SEC filing metadata
- accession: 0001683168-23-006510
- form_type: 8-K
- ticker: ISCO
- cik: 0001355790
- company_name: International Stem Cell CORP
- filed_at: 2023-09-18T23:59:59+00:00
- event_type: debt
- sentiment: neutral
- materiality_score: 0.45
- calibrated_materiality_score: 0.45
- confidence: high
- sec_items: 1.01, 2.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1355790/000168316823006510/0001683168-23-006510-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1355790/000168316823006510/intlstemcell_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001683168-23-006510
- JSON: https://secwatch.observer/filing/0001683168-23-006510.json
- Plain text: https://secwatch.observer/filing/0001683168-23-006510.txt

## Key facts
- Debt Financings
  International Stem Cell CORP incurred loan of $2,900,000 with Dr. Andrey Semechkin at four and a half percent (4.5%) per annum maturing September 15, 2024.
  - Instrument: loan
  - Principal: $2,900,000
  - Counterparty: Dr. Andrey Semechkin
  - Rate: four and a half percent (4.5%) per annum
  - Maturity: September 15, 2024
  - Event: incurrence
  source text: On September 15, 2023, International Stem Cell Corporation (the "Company") and Dr. Andrey Semechkin agreed to extend (until September 15, 2024) the maturity date of the loan (in the principal amount of $2,900,000) from Dr. Semechkin to the Company that had been reflected in a promissory note dated March 15, 2023 (the "Original Note"), and which would have been due on September 15, 2023.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1355790/000168316823006510/0001683168-23-006510-index.htm
- Material Agreements
  International Stem Cell CORP entered into Note with Dr. Andrey Semechkin valued at principal amount of $2,900,000 (effective 2023-09-15).
  - Action: entry
  - Counterparty: Dr. Andrey Semechkin
  - Value: principal amount of $2,900,000
  - Effective: 2023-09-15
  source text: On September 15, 2023, International Stem Cell Corporation (the “Company”) and Dr. Andrey Semechkin agreed to extend (until September 15, 2024) the maturity date of the loan (in the principal amount of $2,900,000) from Dr. Semechkin to the Company that had been reflected in a promissory note dated March 15, 2023 (the “Original Note”), and which would have been due on September 15, 2023. In exchange for the Original Note, the Company issued to Dr. Semechkin an unsecured, non-convertible promissory note in the principal amount of $2,900,000 (the “Note”) with the extended maturity date.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1355790/000168316823006510/0001683168-23-006510-index.htm

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