---
schema_version: "secwatch.filing_event.v1"
accession: "0001437749-25-017426"
form_type: "8-K/A"
ticker: "OMER"
cik: "0001285819"
company_name: "OMEROS CORP"
filed_at: "2025-05-16T23:59:59+00:00"
generated_at: "2026-05-21T02:53:27.345887+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.05
calibrated_materiality_score: 0.05
confidence: "medium"
source: SEC EDGAR
---

# Omeros files 8-K/A to correct omitted table in Second Supplemental Indenture

## Summary
- Amendment filed solely to replace Exhibit 4.2 with corrected version including missing table.
- Second Supplemental Indenture dated May 14, 2025 with Computershare Trust Company as trustee.
- No other changes made to the original May 15, 2025 Current Report or to Exhibit 4.2.
- Error stemmed from processing issue with embedded table; financial terms unaffected.

## SEC filing metadata
- accession: 0001437749-25-017426
- form_type: 8-K/A
- ticker: OMER
- cik: 0001285819
- company_name: OMEROS CORP
- filed_at: 2025-05-16T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.05
- calibrated_materiality_score: 0.05
- confidence: medium
- sec_items: 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1285819/000143774925017426/0001437749-25-017426-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1285819/000143774925017426/omer20250515_8ka.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001437749-25-017426
- JSON: https://secwatch.observer/filing/0001437749-25-017426.json
- Plain text: https://secwatch.observer/filing/0001437749-25-017426.txt

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