---
schema_version: "secwatch.filing_event.v1"
accession: "0000950170-25-114093"
form_type: "8-K"
ticker: "LONA"
cik: "0001620463"
company_name: "LeonaBio, Inc."
filed_at: "2025-09-11T23:59:59+00:00"
generated_at: "2026-05-17T06:52:58.891825+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Athira Pharma to effect 10-for-1 reverse stock split on Sep 17 to meet Nasdaq minimum bid price

## Summary
- Effective Sept 17 at 5pm ET; shares start trading split-adjusted on Sep 18 under ticker ATHA.
- Every 10 pre-split shares convert to 1; authorized common shares reduced from 900M to 90M.
- Purpose: increase share price to comply with Nasdaq's $1.00 minimum bid requirement.
- Fractional shares paid in cash; CUSIP changes to 04746L203.
- No action needed by book-entry or street-name holders; Computershare is exchange agent.

## SEC filing metadata
- accession: 0000950170-25-114093
- form_type: 8-K
- ticker: LONA
- cik: 0001620463
- company_name: LeonaBio, Inc.
- filed_at: 2025-09-11T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 3.03, 5.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1620463/000095017025114093/0000950170-25-114093-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1620463/000095017025114093/atha-20250910.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950170-25-114093
- JSON: https://secwatch.observer/filing/0000950170-25-114093.json
- Plain text: https://secwatch.observer/filing/0000950170-25-114093.txt

## Key facts
- Governance Changes
  LeonaBio, Inc.: Amended certificate of incorporation to effect a 10-for-1 reverse stock split (effective 2025-09-17).
  - Change: charter amendment
  - Effective: 2025-09-17
  source text: On September 10, 2025, the Company filed a certificate of amendment to the Company’s Amended and Restated Certificate of Incorporation (the “Certificate of Amendment”), with the Secretary of State of the State of Delaware to effect a 10-for-1 reverse stock split of the shares of the Company’s common stock, par value $0.0001 per share, effective as of 5:00 p.m., Eastern Time, on September 17, 2025 (the “Reverse Stock Split”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/1620463/000095017025114093/0000950170-25-114093-index.htm

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