---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-26-021051"
form_type: "8-K"
ticker: "ENZN"
cik: "0000727510"
company_name: "Viskase Holdings, Inc."
filed_at: "2026-02-27T23:59:59+00:00"
generated_at: "2026-05-15T23:17:22.538060+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Enzon extends Series C Preferred exchange offer to Mar 9; rights plan extended to Mar 11

## Summary
- Exchange offer for Series C Preferred Stock extended to 11:59 p.m. ET on March 9, 2026.
- Rights Agreement final expiration extended from March 2 to noon ET on March 11, 2026 via Eighth Amendment.
- The offer, previously set to expire March 2, is part of the proposed merger with Viskase Companies, Inc.

## SEC filing metadata
- accession: 0001104659-26-021051
- form_type: 8-K
- ticker: ENZN
- cik: 0000727510
- company_name: Viskase Holdings, Inc.
- filed_at: 2026-02-27T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 1.01, 3.03, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/727510/000110465926021051/0001104659-26-021051-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/727510/000110465926021051/tm267491d2_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-26-021051
- JSON: https://secwatch.observer/filing/0001104659-26-021051.json
- Plain text: https://secwatch.observer/filing/0001104659-26-021051.txt

## Key facts
- Material Agreements
  Viskase Holdings, Inc. amended Eighth Amendment to the Section 382 Rights Agreement with Continental Stock Transfer & Trust Company (effective 2026-02-27).
  - Action: amendment
  - Counterparty: Continental Stock Transfer & Trust Company
  - Effective: 2026-02-27
  source text: On February 27, 2026, Enzon Pharmaceuticals, Inc. (the “ Company ”) entered into the Eighth Amendment to the Section 382 Rights Agreement (the “ Eighth 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/727510/000110465926021051/0001104659-26-021051-index.htm

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