---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-26-035301"
form_type: "8-K"
ticker: "ENZN"
cik: "0000727510"
company_name: "Viskase Holdings, Inc."
filed_at: "2026-03-26T23:59:59+00:00"
generated_at: "2026-05-15T08:55:57.944419+00:00"
event_type: "m_and_a"
sentiment: "neutral"
materiality_score: 0.9
calibrated_materiality_score: 0.9
confidence: "high"
source: SEC EDGAR
---

# Enzon completes all-stock merger with Viskase; combined company renamed Viskase Holdings

## Summary
- Enzon shareholders own ~45%, Viskase shareholders ~55% of combined company.
- Thomas D. Davis appointed CEO; Richard Feinstein resigned as CEO/CFO/Secretary.
- Board expanded to seven members; Robert Flint named Chair; new directors appointed.
- Company renamed Viskase Holdings, Inc.; common stock trades as ENZND for 20 days.
- Series C Preferred exchanged for 5,658,396 common shares; Series A-1 Preferred eliminated.

## SEC filing metadata
- accession: 0001104659-26-035301
- form_type: 8-K
- ticker: ENZN
- cik: 0000727510
- company_name: Viskase Holdings, Inc.
- filed_at: 2026-03-26T23:59:59+00:00
- event_type: m_and_a
- sentiment: neutral
- materiality_score: 0.9
- calibrated_materiality_score: 0.9
- confidence: high
- sec_items: 2.01, 3.02, 5.01, 5.02, 5.03, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/727510/000110465926035301/0001104659-26-035301-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/727510/000110465926035301/tm269894d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-26-035301
- JSON: https://secwatch.observer/filing/0001104659-26-035301.json
- Plain text: https://secwatch.observer/filing/0001104659-26-035301.txt

## Source-grounded claims
- claim_id: 3cb1c48e9a3a645cf0c3395cba6c799dc2c48893
  claim: Viskase Holdings, Inc.: Eliminated Certificate of Designation for Series A-1 Junior Participating Preferred Stock via Certificate of Elimination.
  evidence_excerpt: the Company filed a Certificate of Elimination (the “ Certificate of Elimination ”) to its Certificate of Incorporation with the Secretary of State of the State of Delaware eliminating from the Certificate of Incorporation all matters set forth in the Certificate of Designation with respect to the Company’s Series A-1 Junior Participating Preferred Stock
  evidence_url: https://www.sec.gov/Archives/edgar/data/727510/000110465926035301/0001104659-26-035301-index.htm
- claim_id: debba8c22fd72176d92f147951e27a548353ff37
  claim: Viskase Holdings, Inc.: Changed company name to Viskase Holdings, Inc. via Certificate of Amendment to Amended Certificate of Incorporation.
  evidence_excerpt: the Company filed a Certificate of Amendment (the “ Certificate of Amendment ”) to its Amended Certificate of Incorporation (the “ Certificate of Incorporation ”) with the Secretary of State of the State of Delaware to change its name to “Viskase Holdings, Inc.”
  evidence_url: https://www.sec.gov/Archives/edgar/data/727510/000110465926035301/0001104659-26-035301-index.htm
- claim_id: 0d0110ef8e2faf4befd923764b697365493577f1
  claim: Viskase Holdings, Inc. completed an acquisition involving Viskase Companies, Inc. for all-stock transaction (closed 2026-03-26).
  evidence_excerpt: On March 26, 2026 (the " Closing Date "), Viskase Holdings, Inc. (formerly known as Enzon Pharmaceuticals, Inc.) (the " Company " or the " Combined Company ") consummated the previously announced transactions pursuant to the Agreement and Plan of Merger, dated as of June 20, 2025, by and among the Company, EPSC Acquisition Corp. (" Merger Sub "), and Viskase Companies, Inc. (" Viskase "), as amended by the First Amendment to the Agreement and Plan of Merger, dated as of October 24, 2025 (as amended, the " Merger Agreement ").
  evidence_url: https://www.sec.gov/Archives/edgar/data/727510/000110465926035301/0001104659-26-035301-index.htm
- claim_id: d15be21534c7768fc9ffe1f0b45db73fe66d95e4
  claim: Viskase Holdings, Inc. underwent a change of control involving Viskase Companies, Inc. for all-stock transaction (closed 2026-03-26).
  evidence_excerpt: On March 26, 2026 (the " Closing Date "), Viskase Holdings, Inc. (formerly known as Enzon Pharmaceuticals, Inc.) (the " Company " or the " Combined Company ") consummated the previously announced transactions pursuant to the Agreement and Plan of Merger, dated as of June 20, 2025, by and among the Company, EPSC Acquisition Corp. (" Merger Sub "), and Viskase Companies, Inc. (" Viskase "), as amended by the First Amendment to the Agreement and Plan of Merger, dated as of October 24, 2025 (as amended, the " Merger Agreement ").
  evidence_url: https://www.sec.gov/Archives/edgar/data/727510/000110465926035301/0001104659-26-035301-index.htm

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