---
schema_version: "secwatch.filing_event.v1"
accession: "0001493152-26-042672"
form_type: "8-K"
ticker: "GTBP"
cik: "0000109657"
company_name: "GT Biopharma, Inc."
filed_at: "2026-09-15T12:57:47+00:00"
generated_at: "2026-09-15T13:00:40.378417+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.8
calibrated_materiality_score: 0.8
confidence: "high"
source: SEC EDGAR
---

# GT Biopharma raises $7.45M via convertible preferred stock and warrants

## Summary
- GT Biopharma raises $7.45M via Series M 10% Convertible Preferred Stock and warrants; stated value $8.28M.
- Conversion price $6.10; warrants exercisable at $6.10 for 100% of conversion shares, 5-year term.
- Greenshoe option to purchase up to $30M additional preferred stock (stated value $33.33M) at 10% discount.
- Dividends at 10% per annum until Sept 2027, then 12%; full ratchet price protection.
- Company to seek shareholder approval for issuance over 19.99% of outstanding shares; officers/directors entered lockup and voting agreements.

## SEC filing metadata
- accession: 0001493152-26-042672
- form_type: 8-K
- ticker: GTBP
- cik: 0000109657
- company_name: GT Biopharma, Inc.
- filed_at: 2026-09-15T12:57:47+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.8
- calibrated_materiality_score: 0.8
- confidence: high
- sec_items: 1.01, 3.02, 3.03, 5.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/109657/000149315226042672/0001493152-26-042672-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/109657/000149315226042672/form8-k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001493152-26-042672
- JSON: https://secwatch.observer/filing/0001493152-26-042672.json
- Plain text: https://secwatch.observer/filing/0001493152-26-042672.txt

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