Viskase Holdings, Inc. SEC filings VISK
Viskase Holdings, Inc. has 1,000 filings in SEC EDGAR's recent list, going back to Nov 17, 2004. Its latest annual report, Form 10-K, was filed on Mar 2, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Nov 3, 2026, covering the quarter ended Sep 30, 2026. The most recent current report (Form 8-K) was filed on May 5, 2026 (material agreement, change to shareholder rights, bylaw or fiscal year change, regulation fd disclosure). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 3 | Initial insider ownership | May 1, 2026 | Apr 30, 2026 |
| 4 | Insider transaction | Mar 27, 2026 | Mar 25, 2026 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Mar 27, 2026 | — |
| 3 | Initial insider ownership | Mar 26, 2026 | Mar 26, 2026 |
| 3 | Initial insider ownership | Mar 26, 2026 | Mar 26, 2026 |
| 3 | Initial insider ownership | Mar 26, 2026 | Mar 26, 2026 |
| 3 | Initial insider ownership | Mar 26, 2026 | Mar 26, 2026 |
| 3 | Initial insider ownership | Mar 26, 2026 | Mar 26, 2026 |
| 3 | Initial insider ownership | Mar 26, 2026 | Mar 26, 2026 |
| 3 | Initial insider ownership | Mar 26, 2026 | Mar 26, 2026 |
| 3 | Initial insider ownership | Mar 26, 2026 | Mar 26, 2026 |
| 3 | Initial insider ownership | Mar 26, 2026 | Mar 26, 2026 |
| 3 | Initial insider ownership | Mar 26, 2026 | Mar 26, 2026 |
| 3 | Initial insider ownership | Mar 26, 2026 | Mar 26, 2026 |
| 3 | Initial insider ownership | Mar 26, 2026 | Mar 26, 2026 |
| 3 | Initial insider ownership | Mar 26, 2026 | Mar 26, 2026 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Jan 30, 2026 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Oct 24, 2025 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Jun 23, 2025 | — |
| 3 | Initial insider ownership | Jan 10, 2025 | Jan 7, 2025 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Dec 19, 2024 | — |
| SC 13D/A | Amended ownership over 5% (active) | Aug 19, 2024 | — |
| 4 | Insider transaction | Jun 16, 2023 | Jun 14, 2023 |
| 3 | Initial insider ownership | Jun 21, 2022 | Jun 9, 2022 |
| 4 | Insider transaction | Aug 17, 2021 | Aug 13, 2021 |
| 4 | Insider transaction | Nov 18, 2020 | Nov 16, 2020 |
| 4 | Insider transaction | Nov 17, 2020 | Nov 13, 2020 |
| 4 | Insider transaction | Oct 14, 2020 | Oct 9, 2020 |
| SC 13D/A | Amended ownership over 5% (active) | Oct 14, 2020 | — |
| SC 13D/A | Amended ownership over 5% (active) | Sep 17, 2020 | — |
| SC 13D/A | Amended ownership over 5% (active) | Sep 1, 2020 | — |
| 4 | Insider transaction | Aug 26, 2020 | Aug 24, 2020 |
| 3 | Initial insider ownership | Aug 18, 2020 | Aug 4, 2020 |
| 3 | Initial insider ownership | Aug 14, 2020 | Aug 4, 2020 |
| SC 13D/A | Amended ownership over 5% (active) | Aug 7, 2020 | — |
| 4 | Insider transaction | Aug 6, 2020 | Aug 5, 2020 |
| 3 | Initial insider ownership | Aug 6, 2020 | Aug 3, 2020 |
| SC 13D/A | Amended ownership over 5% (active) | Aug 5, 2020 | — |
| SC 13D | Ownership over 5% (active) | Apr 16, 2020 | — |
| 4/A | Ownership document | Mar 31, 2020 | Mar 13, 2020 |
| 3 | Initial insider ownership | Mar 31, 2020 | Mar 18, 2020 |
| 4 | Insider transaction | Mar 27, 2020 | Mar 13, 2020 |
| SC 13G/A | Amended ownership over 5% (passive) | Mar 27, 2020 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 22, 2020 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 16, 2020 | — |
| 4 | Insider transaction | Feb 14, 2019 | Feb 11, 2019 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2019 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 31, 2019 | — |
| 4 | Insider transaction | Jan 9, 2019 | Apr 13, 2018 |
| 4 | Insider transaction | Jan 9, 2019 | Apr 13, 2018 |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 3, 2019 | — |
| 3 | Initial insider ownership | Apr 13, 2018 | Apr 4, 2018 |
| SC 13G/A | Amended ownership over 5% (passive) | Apr 13, 2018 | — |
| SC 13G | Ownership over 5% (passive) | Feb 9, 2018 | — |
| SC 13G | Ownership over 5% (passive) | Jan 22, 2018 | — |
| SC 13G | Ownership over 5% (passive) | May 24, 2017 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2017 | — |
| SC 13D/A | Amended ownership over 5% (active) | Dec 8, 2016 | — |
| 4 | Insider transaction | Nov 29, 2016 | Nov 28, 2016 |
| SC 13D/A | Amended ownership over 5% (active) | Nov 29, 2016 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jun 9, 2016 | — |
| 3 | Initial insider ownership | Apr 5, 2016 | Mar 31, 2016 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 12, 2016 | — |
| SC 13G | Ownership over 5% (passive) | Feb 12, 2016 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 26, 2016 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 6, 2015 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 22, 2015 | — |
| 4 | Insider transaction | Nov 28, 2014 | Nov 28, 2012 |
| SC 13G/A | Amended ownership over 5% (passive) | Apr 9, 2014 | — |
| SC 13G | Ownership over 5% (passive) | Mar 13, 2014 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 12, 2014 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 10, 2014 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 9, 2014 | — |
| 3 | Initial insider ownership | Dec 13, 2013 | Dec 13, 2013 |
| 3 | Initial insider ownership | Oct 9, 2013 | Oct 7, 2013 |
| SC 13D/A | Amended ownership over 5% (active) | Oct 9, 2013 | — |
| 3 | Initial insider ownership | Oct 7, 2013 | Sep 25, 2013 |
| 3 | Initial insider ownership | Oct 7, 2013 | Sep 25, 2013 |
| 4 | Insider transaction | Sep 19, 2013 | Sep 17, 2013 |
| SC 13G/A | Amended ownership over 5% (passive) | Jun 14, 2013 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 13, 2013 | — |
| SC 13G | Ownership over 5% (passive) | Feb 12, 2013 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 11, 2013 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 6, 2013 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 31, 2013 | — |
| 4 | Insider transaction | Jan 25, 2013 | Jan 23, 2013 |
| 4 | Insider transaction | Jan 25, 2013 | Jan 23, 2013 |
| 4 | Insider transaction | Jan 25, 2013 | Jan 23, 2013 |
| 4 | Insider transaction | Jan 4, 2013 | Jan 2, 2013 |
| 4 | Insider transaction | Jan 4, 2013 | Jan 2, 2013 |
| 4 | Insider transaction | Jan 4, 2013 | Jan 2, 2013 |
| 4 | Insider transaction | Jan 4, 2013 | Jan 2, 2013 |
| 4 | Insider transaction | Jan 4, 2013 | Jan 2, 2013 |
| 4 | Insider transaction | Jan 4, 2013 | Jan 2, 2013 |
| SC 13G | Ownership over 5% (passive) | Jan 2, 2013 | — |
| SC 13D/A | Amended ownership over 5% (active) | Nov 28, 2012 | — |
| SC 13D/A | Amended ownership over 5% (active) | Nov 13, 2012 | — |
| 4 | Insider transaction | Nov 8, 2012 | Nov 7, 2012 |
| SC 13G/A | Amended ownership over 5% (passive) | Sep 6, 2012 | — |
| 4 | Insider transaction | Aug 15, 2012 | Aug 14, 2012 |
| 4 | Insider transaction | Aug 13, 2012 | Aug 10, 2012 |
| 4 | Insider transaction | Jul 3, 2012 | Jul 2, 2012 |
| 4 | Insider transaction | Jul 3, 2012 | Jul 2, 2012 |
| 4 | Insider transaction | Jul 3, 2012 | Jul 2, 2012 |
| 4 | Insider transaction | Jul 3, 2012 | Jul 2, 2012 |
| 4 | Insider transaction | Jul 3, 2012 | Jul 2, 2012 |
| 4 | Insider transaction | Jul 3, 2012 | Jul 2, 2012 |
| 4 | Insider transaction | Jun 21, 2012 | Jun 20, 2012 |
| 4 | Insider transaction | Jun 6, 2012 | Jun 5, 2012 |
| 4 | Insider transaction | Jun 6, 2012 | Jun 5, 2012 |
| SC 13G/A | Amended ownership over 5% (passive) | Apr 10, 2012 | — |
| 4 | Insider transaction | Mar 29, 2012 | Mar 28, 2012 |
| 4 | Insider transaction | Mar 16, 2012 | Mar 15, 2012 |
| 4 | Insider transaction | Feb 29, 2012 | Feb 27, 2012 |
| 3 | Initial insider ownership | Feb 29, 2012 | Feb 27, 2012 |
| 3/A | Form 3/a | Feb 28, 2012 | Feb 17, 2011 |
| SC 13D/A | Amended ownership over 5% (active) | Feb 28, 2012 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2012 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2012 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 10, 2012 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 9, 2012 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 6, 2012 | — |
| 4/A | Ownership document | Jan 19, 2012 | Nov 17, 2011 |
| 4 | Insider transaction | Jan 19, 2012 | Jan 17, 2012 |
| 4 | Insider transaction | Jan 19, 2012 | Jan 17, 2012 |
| 4 | Insider transaction | Jan 19, 2012 | Jan 17, 2012 |
| 4 | Insider transaction | Jan 19, 2012 | Jan 17, 2012 |
| 4 | Insider transaction | Jan 19, 2012 | Jan 17, 2012 |
| 4 | Insider transaction | Jan 5, 2012 | Jan 3, 2012 |
| 4 | Insider transaction | Jan 5, 2012 | Jan 3, 2012 |
| 4 | Insider transaction | Jan 5, 2012 | Jan 3, 2012 |
| 4 | Insider transaction | Jan 5, 2012 | Jan 3, 2012 |
| 4 | Insider transaction | Jan 5, 2012 | Jan 3, 2012 |
| 4 | Insider transaction | Jan 5, 2012 | Jan 3, 2012 |
| 3 | Initial insider ownership | Jan 5, 2012 | Jan 3, 2012 |
| 4 | Insider transaction | Dec 20, 2011 | Dec 19, 2011 |
| 3 | Initial insider ownership | Dec 20, 2011 | Dec 19, 2011 |
| 4 | Insider transaction | Nov 21, 2011 | Nov 17, 2011 |
| 4 | Insider transaction | Nov 10, 2011 | Nov 10, 2011 |
| 4 | Insider transaction | Nov 10, 2011 | Nov 8, 2011 |
| SC 13G | Ownership over 5% (passive) | Oct 6, 2011 | — |
| 4 | Insider transaction | Sep 19, 2011 | Sep 15, 2011 |
| 4 | Insider transaction | Sep 19, 2011 | Sep 15, 2011 |
| 4 | Insider transaction | Sep 19, 2011 | Sep 15, 2011 |
| 4 | Insider transaction | Sep 19, 2011 | Sep 15, 2011 |
| SC 13D/A | Amended ownership over 5% (active) | Aug 22, 2011 | — |
| 4 | Insider transaction | Aug 16, 2011 | Aug 12, 2011 |
| 4 | Insider transaction | Aug 16, 2011 | Aug 12, 2011 |
| 4 | Insider transaction | Aug 16, 2011 | Aug 12, 2011 |
| SC 13D/A | Amended ownership over 5% (active) | Aug 15, 2011 | — |
| 3 | Initial insider ownership | Aug 1, 2011 | Jul 20, 2011 |
| 3 | Initial insider ownership | Aug 1, 2011 | Jul 20, 2011 |
| 3 | Initial insider ownership | Aug 1, 2011 | Jul 20, 2011 |
| 4 | Insider transaction | Jul 6, 2011 | Jul 1, 2011 |
| 4 | Insider transaction | Jul 6, 2011 | Jul 1, 2011 |
| 4 | Insider transaction | Jul 6, 2011 | Jul 1, 2011 |
| 4 | Insider transaction | Jul 6, 2011 | Jul 1, 2011 |
| 4 | Insider transaction | Jul 6, 2011 | Jul 1, 2011 |
| 4 | Insider transaction | Jul 6, 2011 | Jul 1, 2011 |
| 4 | Insider transaction | Jul 6, 2011 | Jul 1, 2011 |
| 4 | Insider transaction | Jun 9, 2011 | Jun 8, 2011 |
| 3 | Initial insider ownership | Jun 9, 2011 | Jun 8, 2011 |
| 4 | Insider transaction | Jun 2, 2011 | Jun 1, 2011 |
| SC 13G | Ownership over 5% (passive) | Apr 21, 2011 | — |
| 4 | Insider transaction | Apr 5, 2011 | Apr 3, 2011 |
| 4 | Insider transaction | Apr 5, 2011 | Apr 3, 2011 |
| 4 | Insider transaction | Apr 5, 2011 | Apr 3, 2011 |
| 4 | Insider transaction | Apr 1, 2011 | Mar 30, 2011 |
| 4 | Insider transaction | Apr 1, 2011 | Mar 30, 2011 |
| 4 | Insider transaction | Apr 1, 2011 | Mar 30, 2011 |
| SC 13D/A | Amended ownership over 5% (active) | Mar 4, 2011 | — |
| 4 | Insider transaction | Mar 1, 2011 | Feb 28, 2011 |
| 3 | Initial insider ownership | Feb 28, 2011 | Feb 17, 2011 |
| 4 | Insider transaction | Feb 24, 2011 | Feb 22, 2011 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2011 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 11, 2011 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 11, 2011 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 10, 2011 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 4, 2011 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 4, 2011 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 4, 2011 | — |
| 4 | Insider transaction | Jan 28, 2011 | Jan 17, 2011 |
| 5 | Annual insider ownership | Jan 28, 2011 | Dec 31, 2010 |
| 5 | Annual insider ownership | Jan 28, 2011 | Dec 31, 2010 |
| 4 | Insider transaction | Jan 28, 2011 | Jan 17, 2011 |
| 5 | Annual insider ownership | Jan 28, 2011 | Dec 31, 2010 |
| 4 | Insider transaction | Jan 28, 2011 | Jan 17, 2011 |
| SC 13D/A | Amended ownership over 5% (active) | Jan 28, 2011 | — |
| 4 | Insider transaction | Jan 5, 2011 | Jan 3, 2011 |
| 4 | Insider transaction | Jan 5, 2011 | Jan 3, 2011 |
| 4 | Insider transaction | Jan 5, 2011 | Jan 3, 2011 |
| 4 | Insider transaction | Jan 5, 2011 | Jan 3, 2011 |
| 4 | Insider transaction | Jan 5, 2011 | Jan 3, 2011 |
| 4 | Insider transaction | Jan 5, 2011 | Jan 3, 2011 |
| 4 | Insider transaction | Jan 5, 2011 | Jan 3, 2011 |
| 4 | Insider transaction | Nov 24, 2010 | Nov 23, 2010 |
| 4 | Insider transaction | Nov 24, 2010 | Nov 23, 2010 |
| 4 | Insider transaction | Nov 24, 2010 | Nov 23, 2010 |
| SC 13D/A | Amended ownership over 5% (active) | Nov 18, 2010 | — |
| SC 13D/A | Amended ownership over 5% (active) | Nov 16, 2010 | — |
Showing 200 filings, the most recent 200. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
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Company profile
- Industry
- Biological Products, (No Diagnostic Substances) (SIC 2836)
- Listed as
- VISK (OTC)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- Lombard, IL
- SEC filer status
- Non-accelerated filer, Smaller reporting company
- SEC CIK
- 727510
- Former names
- ENZON PHARMACEUTICALS, INC. (until Mar 25, 2026); ENZON PHARMACEUTICALS INC (until Feb 23, 2016); ENZON PHARMACEUTICALS INC (until Mar 22, 2006); ENZON PHARMACEUTICAL INC (until Dec 10, 2002); ENZON INC (until Dec 9, 2002)
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All 182 Biological Products, (No Diagnostic Substances) companies
Source: SEC EDGAR filings. This is company-reported data, not investment advice.