{"schema_version":"secwatch.filing_event.v1","accession":"0001104659-25-124254","form_type":"8-K","ticker":"ENZN","cik":"0000727510","company_name":"Viskase Holdings, Inc.","filed_at":"2025-12-23T23:59:59+00:00","discovered_at":"2026-05-14T18:02:42.026504+00:00","generated_at":"2026-05-16T12:22:20.381891+00:00","sec_items":["1.01","3.03","9.01"],"event_type":"other_material","sentiment":"neutral","materiality_score":0.25,"calibrated_materiality_score":0.25,"confidence":"high","headline":"Enzon Pharmaceuticals extends poison pill expiration to Jan 31, 2026","bullets":["Sixth Amendment extends Section 382 Rights Agreement Final Expiration Date from Dec 31, 2025 to Jan 31, 2026.","Rights plan terms otherwise unchanged; adopted to preserve tax attributes under Section 382.","This is the sixth extension of the original August 2020 rights agreement; prior amendments extended expiration sequentially.","The amendment was entered into on Dec 23, 2025 between Enzon and Continental Stock Transfer & Trust Company."],"urls":{"canonical":"https://secwatch.observer/filing/0001104659-25-124254","json":"https://secwatch.observer/filing/0001104659-25-124254.json","markdown":"https://secwatch.observer/filing/0001104659-25-124254.md","text":"https://secwatch.observer/filing/0001104659-25-124254.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/727510/000110465925124254/0001104659-25-124254-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/727510/000110465925124254/tm2534122d1_8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-16T12:22:20.381891+00:00"},"review":{"review_status":"machine_generated","human_reviewed":false,"corrected":false,"correction_note":null,"correction_timestamp":null,"superseded_by":null,"related_filings":[]},"source_grounded_claims":[{"claim_id":"79dbaf33da4cd98b380432d14c2ecac6c5a9e383","claim":"Viskase Holdings, Inc. entered into Sixth Amendment with Continental Stock Transfer & Trust Company (effective 2025-12-23).","evidence_excerpt":"On December 23, 2025, Enzon Pharmaceuticals, Inc. (the “ Company ”) entered into the Sixth Amendment to the Section 382 Rights Agreement (the “ Sixth 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_source":"SEC 8-K Item 1.01/1.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/727510/000110465925124254/0001104659-25-124254-index.htm","confidence":0.9,"family_label":"Material Agreements","details":[{"label":"Action","value":"entry"},{"label":"Counterparty","value":"Continental Stock Transfer & Trust Company"},{"label":"Effective","value":"2025-12-23"}]}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}