---
schema_version: "secwatch.filing_event.v1"
accession: "0001493152-23-008494"
form_type: "8-K"
ticker: "PTIX"
cik: "0001022899"
company_name: "Protagenic Therapeutics, Inc.new"
filed_at: "2023-03-22T23:59:59+00:00"
generated_at: "2026-06-17T20:50:08.245767+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# Protagenic Therapeutics announces 1-for-4 reverse stock split to comply with Nasdaq minimum bid price rule

## Summary
- Reverse split effective 5:01 p.m. ET March 22, 2023; split-adjusted trading Nasdaq opens March 23, 2023.
- Goal: meet Nasdaq Rule 5550(a)(2) $1.00 minimum closing price for continued listing.
- Outstanding shares reduced from ~17,285,261 to ~4,321,315; no fractional shares—rounded up to next whole.
- Proportionate adjustments to exercise prices and shares underlying outstanding options, warrants, and equity awards.
- Authorized shares and par value unchanged; new CUSIP 74365N202; ticker remains PTIX.

## SEC filing metadata
- accession: 0001493152-23-008494
- form_type: 8-K
- ticker: PTIX
- cik: 0001022899
- company_name: Protagenic Therapeutics, Inc.new
- filed_at: 2023-03-22T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 5.03, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1022899/000149315223008494/0001493152-23-008494-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1022899/000149315223008494/form8-k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001493152-23-008494
- JSON: https://secwatch.observer/filing/0001493152-23-008494.json
- Plain text: https://secwatch.observer/filing/0001493152-23-008494.txt

## Key facts
- Governance Changes
  Protagenic Therapeutics, Inc.new: Approved and filed a Certificate of Amendment to effect a 1-for-4 reverse stock split of common stock to comply with Nasdaq Rule 5550(a)(2) (effective 2023-03-22).
  - Change: charter amendment
  - Effective: 2023-03-22
  source text: On March 21, 2023, the Company filed with the Secretary of State of the State of Delaware a certificate of amendment to its third amended and restated certificate of incorporation (the “Certificate of Amendment”) to effect the Reverse Stock Split.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1022899/000149315223008494/0001493152-23-008494-index.htm

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