---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-26-032092"
form_type: "8-K"
ticker: "ENZN"
cik: "0000727510"
company_name: "Viskase Holdings, Inc."
filed_at: "2026-03-19T23:59:59+00:00"
generated_at: "2026-05-15T09:45:16.946933+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.3
calibrated_materiality_score: 0.3
confidence: "medium"
source: SEC EDGAR
---

# Enzon extends exchange offer for Series C Preferred Stock to March 24, 2026

## Summary
- Enzon issued press release on March 19, 2026 extending the expiration of its exchange offer for Series C Preferred Stock.
- Offer now expires at 5:00 p.m. Eastern on March 24, 2026, unless further extended by the company.
- The exchange offer is part of the proposed merger transaction with Viskase Companies, Inc.

## SEC filing metadata
- accession: 0001104659-26-032092
- form_type: 8-K
- ticker: ENZN
- cik: 0000727510
- company_name: Viskase Holdings, Inc.
- filed_at: 2026-03-19T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.3
- calibrated_materiality_score: 0.3
- confidence: medium
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/727510/000110465926032092/0001104659-26-032092-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/727510/000110465926032092/tm267492d13_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-26-032092
- JSON: https://secwatch.observer/filing/0001104659-26-032092.json
- Plain text: https://secwatch.observer/filing/0001104659-26-032092.txt

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