---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-25-200747"
form_type: "8-K"
ticker: "CLSDQ"
cik: "0001539029"
company_name: "Clearside Biomedical, Inc."
filed_at: "2025-09-11T23:59:59+00:00"
generated_at: "2026-05-17T06:52:41.516094+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# Clearside Biomedical files 1-for-15 reverse stock split, reduces authorized shares to 26.7M

## Summary
- Reverse stock split effective September 12, 2025 at 5:00 p.m. ET; split-adjusted trading begins September 15, 2025.
- Every 15 outstanding shares combine into 1; no fractional shares issued – cash in lieu.
- Authorized common stock reduced from 400M to 26,666,666; par value unchanged at $0.001.
- Proportionate adjustments to stock options, RSUs, warrants, and equity plan reserves.
- New CUSIP 185063203; Nasdaq ticker CLSD unchanged.

## SEC filing metadata
- accession: 0001193125-25-200747
- form_type: 8-K
- ticker: CLSDQ
- cik: 0001539029
- company_name: Clearside Biomedical, Inc.
- filed_at: 2025-09-11T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 5.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1539029/000119312525200747/0001193125-25-200747-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1539029/000119312525200747/clsd-20250910.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-25-200747
- JSON: https://secwatch.observer/filing/0001193125-25-200747.json
- Plain text: https://secwatch.observer/filing/0001193125-25-200747.txt

## Key facts
- Governance Changes
  Clearside Biomedical, Inc.: Filed a Certificate of Amendment to effect a 1-for-15 reverse stock split and reduce authorized shares from 400,000,000 to 26,666,666 (effective 2025-09-12).
  - Change: charter amendment
  - Effective: 2025-09-12
  source text: On September 10, 2025, Clearside Biomedical, Inc. (the “ Company ”) filed a Certificate of Amendment to its Amended and Restated Certificate of Incorporation (the “ Amendment ”) with the Secretary of State of the State of Delaware to effect a one-for-fifteen (1-for-15) reverse stock split (the “ Reverse Stock Split ”) of its outstanding common stock and a reduction in the total number of authorized shares of its common stock from 400,000,000 to 26,666,666 (the “ Shares Reduction ”). The Amendment will be effective at 5:00 p.m. Eastern Time on September 12, 2025.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1539029/000119312525200747/0001193125-25-200747-index.htm

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