---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-26-026169"
form_type: "8-K"
ticker: "ENZN"
cik: "0000727510"
company_name: "Viskase Holdings, Inc."
filed_at: "2026-03-11T23:59:59+00:00"
generated_at: "2026-05-15T15:17:41.321585+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.35
calibrated_materiality_score: 0.35
confidence: "high"
source: SEC EDGAR
---

# Enzon extends rights agreement to March 18 and exchange offer to March 16

## Summary
- Ninth Amendment extends Section 382 Rights Agreement expiration to noon, March 18, 2026.
- Exchange offer for Series C Preferred Stock extended to 5:00 p.m. Eastern, March 16, 2026.
- Offer allows Series C Preferred holders to exchange shares for Enzon common stock.

## SEC filing metadata
- accession: 0001104659-26-026169
- form_type: 8-K
- ticker: ENZN
- cik: 0000727510
- company_name: Viskase Holdings, Inc.
- filed_at: 2026-03-11T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.35
- calibrated_materiality_score: 0.35
- confidence: high
- sec_items: 1.01, 3.03, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/727510/000110465926026169/0001104659-26-026169-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/727510/000110465926026169/tm267492d8_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-26-026169
- JSON: https://secwatch.observer/filing/0001104659-26-026169.json
- Plain text: https://secwatch.observer/filing/0001104659-26-026169.txt

## Key facts
- Material Agreements
  Viskase Holdings, Inc. amended Ninth Amendment to the Section 382 Rights Agreement with Continental Stock Transfer & Trust Company valued at Extended the Final Expiration Date from noon, New York City time, on March 11, 2026 to noon, New Yor (effective 2026-03-10).
  - Action: amendment
  - Counterparty: Continental Stock Transfer & Trust Company
  - Value: Extended the Final Expiration Date from noon, New York City time, on March 11, 2026 to noon, New Yor
  - Effective: 2026-03-10
  source text: On March 10, 2026, Enzon Pharmaceuticals, Inc. (the “ Company ”) entered into the Ninth Amendment to the Section 382 Rights Agreement (the “ Ninth Amendment ”), which amends the Section 382 Rights Agreement, dated as of August 14, 2020 (the “ Rights Agreement ”), by and between the Company and Continental Stock Transfer & Trust Company, as rights agent.
  evidence_url: https://www.sec.gov/Archives/edgar/data/727510/000110465926026169/0001104659-26-026169-index.htm

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