---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-24-064247"
form_type: "8-K"
ticker: "ENZN"
cik: "0000727510"
company_name: "Viskase Holdings, Inc."
filed_at: "2024-05-22T23:59:59+00:00"
generated_at: "2026-06-01T09:58:27.672904+00:00"
event_type: "other"
sentiment: "neutral"
materiality_score: 0.2
calibrated_materiality_score: 0.2
confidence: "high"
source: SEC EDGAR
---

# Enzon extends shareholder rights plan expiration to March 31, 2025

## Summary
- Second Amendment to Section 382 Rights Agreement extends final expiration date from June 2, 2024 to March 31, 2025.
- Rights agreement otherwise remains unmodified; rights agent is Continental Stock Transfer & Trust Company.
- Extension intended to preserve ability to utilize net operating loss carryforwards.

## SEC filing metadata
- accession: 0001104659-24-064247
- form_type: 8-K
- ticker: ENZN
- cik: 0000727510
- company_name: Viskase Holdings, Inc.
- filed_at: 2024-05-22T23:59:59+00:00
- event_type: other
- sentiment: neutral
- materiality_score: 0.2
- calibrated_materiality_score: 0.2
- confidence: high
- sec_items: 1.01, 3.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/727510/000110465924064247/0001104659-24-064247-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/727510/000110465924064247/tm2415024d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-24-064247
- JSON: https://secwatch.observer/filing/0001104659-24-064247.json
- Plain text: https://secwatch.observer/filing/0001104659-24-064247.txt

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