---
schema_version: "secwatch.filing_event.v1"
accession: "0000950170-25-114089"
form_type: "8-K"
ticker: "CLSDQ"
cik: "0001539029"
company_name: "Clearside Biomedical, Inc."
filed_at: "2025-09-11T23:59:59+00:00"
generated_at: "2026-05-17T06:52:36.408571+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

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

## Summary
- Reverse stock split at 1-for-15 ratio; effective 5:00 p.m. ET on Sept 12, 2025.
- Authorized shares reduced from 400M to 26,666,666; no change to par value.
- Trading on split-adjusted basis on Nasdaq Capital Market starting Sept 15, 2025; new CUSIP 185063203.
- No fractional shares; cash paid in lieu; proportionate adjustments to stock options, RSUs, warrants.

## SEC filing metadata
- accession: 0000950170-25-114089
- 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/1539029/000095017025114089/0000950170-25-114089-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1539029/000095017025114089/clsd-20250910.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950170-25-114089
- JSON: https://secwatch.observer/filing/0000950170-25-114089.json
- Plain text: https://secwatch.observer/filing/0000950170-25-114089.txt

## Key facts
- Governance Changes
  Clearside Biomedical, Inc.: Clearside Biomedical filed a Certificate of Amendment to effect a 1-for-15 reverse stock split and reduce authorized common 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 ”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/1539029/000095017025114089/0000950170-25-114089-index.htm

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