---
schema_version: "secwatch.filing_event.v1"
accession: "0001493152-26-043562"
form_type: "8-K"
ticker: "GTBP"
cik: "0000109657"
company_name: "GT Biopharma, Inc."
filed_at: "2026-09-21T20:10:24+00:00"
generated_at: "2026-09-21T20:11:13.195166+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# GT Biopharma ups private placement to $7.75M, adds new investor

## Summary
- Amended securities purchase agreement raises aggregate purchase price from $7.45M to $7.75M for 8,611.111 Series M preferred shares (stated value $8.61M).
- New purchaser Nicholas R. Nikolov joins via joinder to registration rights agreement; Five Narrow Lane and Bristol Investment Fund remain majority purchasers.
- Greenshoe rights allow purchasers to buy up to $34,675,615 stated value for $31,208,054 aggregate purchase price.
- Certificate of Increase raises designated Series M preferred shares from 41,778 to 43,287.
- Offering private under Rule 506(b); registration statement to be filed within 30 days of closing.

## SEC filing metadata
- accession: 0001493152-26-043562
- form_type: 8-K
- ticker: GTBP
- cik: 0000109657
- company_name: GT Biopharma, Inc.
- filed_at: 2026-09-21T20:10:24+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 1.01, 3.02, 3.03, 5.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/109657/000149315226043562/0001493152-26-043562-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/109657/000149315226043562/form8-k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001493152-26-043562
- JSON: https://secwatch.observer/filing/0001493152-26-043562.json
- Plain text: https://secwatch.observer/filing/0001493152-26-043562.txt

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