---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-26-025217"
form_type: "8-K"
ticker: "ENZN"
cik: "0000727510"
company_name: "Viskase Holdings, Inc."
filed_at: "2026-03-09T23:59:59+00:00"
generated_at: "2026-05-15T18:23:51.046946+00:00"
event_type: "other"
sentiment: "neutral"
materiality_score: 0.3
calibrated_materiality_score: 0.3
confidence: "high"
source: SEC EDGAR
---

# Enzon extends exchange offer for Series C Preferred to March 11, 2026

## Summary
- Exchange offer expiration extended to one minute after 11:59 p.m. ET on March 11, 2026.
- Offer allows Series C Non-Convertible Redeemable Preferred Stock holders to exchange for common stock.
- Extension announced via press release on March 9, 2026; further extensions possible.
- Process relates to proposed merger with Viskase Companies, Inc.

## SEC filing metadata
- accession: 0001104659-26-025217
- form_type: 8-K
- ticker: ENZN
- cik: 0000727510
- company_name: Viskase Holdings, Inc.
- filed_at: 2026-03-09T23:59:59+00:00
- event_type: other
- sentiment: neutral
- materiality_score: 0.3
- calibrated_materiality_score: 0.3
- confidence: high
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/727510/000110465926025217/0001104659-26-025217-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/727510/000110465926025217/tm267492d5_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-26-025217
- JSON: https://secwatch.observer/filing/0001104659-26-025217.json
- Plain text: https://secwatch.observer/filing/0001104659-26-025217.txt

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