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 |
|---|---|---|---|
| 10-Q | Quarterly report | Nov 3, 2026 | Sep 30, 2026 |
| 10-Q | Quarterly report | Aug 3, 2026 | Jun 30, 2026 |
| 8-A12G | Filing | May 5, 2026 | — |
| 8-K |
Current report
Material agreement, Change to shareholder rights, Bylaw or fiscal year change, Regulation FD disclosure
|
May 5, 2026 | Apr 30, 2026 |
| 10-Q | Quarterly report | May 4, 2026 | Mar 31, 2026 |
| 3 | Initial insider ownership | May 1, 2026 | Apr 30, 2026 |
| 8-K/A | Amended current report | May 1, 2026 | Mar 26, 2026 |
| 8-K |
Current report
Officer or director change
|
May 1, 2026 | Apr 29, 2026 |
| 10-K/A | Amended annual report | Apr 29, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Material agreement, New debt
|
Apr 21, 2026 | Apr 16, 2026 |
| 8-K |
Current report
Auditor change
|
Apr 16, 2026 | Apr 14, 2026 |
| 8-K |
Current report
Officer or director change
|
Apr 15, 2026 | Apr 10, 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 |
| 8-K |
Current report
Acquisition or sale of assets, Unregistered share sale, Change in control, Officer or director change, Bylaw or fiscal year change, Regulation FD disclosure
|
Mar 26, 2026 | Mar 26, 2026 |
| 425 | Filing | Mar 25, 2026 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Mar 25, 2026 | Mar 25, 2026 |
| SC TO-I/A | Filing | Mar 25, 2026 | — |
| SC TO-I/A | Filing | Mar 24, 2026 | — |
| 8-A12G/A | Filing | Mar 24, 2026 | — |
| 425 | Filing | Mar 24, 2026 | — |
| 8-K |
Current report
Material agreement, Change to shareholder rights, Bylaw or fiscal year change, Regulation FD disclosure
|
Mar 24, 2026 | Mar 20, 2026 |
| 425 | Filing | Mar 19, 2026 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Mar 19, 2026 | Mar 19, 2026 |
| SC TO-I/A | Filing | Mar 19, 2026 | — |
| 8-A12G/A | Filing | Mar 18, 2026 | — |
| 425 | Filing | Mar 18, 2026 | — |
| 8-K |
Current report
Material agreement, Change to shareholder rights
|
Mar 18, 2026 | Mar 18, 2026 |
| 425 | Filing | Mar 16, 2026 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Mar 16, 2026 | Mar 16, 2026 |
| SC TO-I/A | Filing | Mar 16, 2026 | — |
| 8-A12G/A | Filing | Mar 11, 2026 | — |
| 425 | Filing | Mar 11, 2026 | — |
| 8-K |
Current report
Material agreement, Change to shareholder rights, Regulation FD disclosure
|
Mar 11, 2026 | Mar 10, 2026 |
| SC TO-I/A | Filing | Mar 11, 2026 | — |
| 425 | Filing | Mar 9, 2026 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Mar 9, 2026 | Mar 9, 2026 |
| SC TO-I/A | Filing | Mar 9, 2026 | — |
| 424B3 | Prospectus | Mar 3, 2026 | — |
| SC TO-I/A | Filing | Mar 3, 2026 | — |
| 10-K | Annual report | Mar 2, 2026 | Dec 31, 2025 |
| 8-A12G/A | Filing | Feb 27, 2026 | — |
| 425 | Filing | Feb 27, 2026 | — |
| 8-K |
Current report
Material agreement, Change to shareholder rights, Regulation FD disclosure
|
Feb 27, 2026 | Feb 27, 2026 |
| SC TO-I/A | Filing | Feb 27, 2026 | — |
| SC 14F1 | Filing | Feb 26, 2026 | — |
| SC TO-I/A | Filing | Feb 11, 2026 | — |
| 425 | Filing | Feb 11, 2026 | — |
| 8-K |
Current report
Shareholder vote results
|
Feb 11, 2026 | Feb 11, 2026 |
| EFFECT | Filing | Jan 30, 2026 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Jan 30, 2026 | — |
| SC TO-I | Filing | Jan 30, 2026 | — |
| 424B3 | Prospectus | Jan 30, 2026 | — |
| S-4/A | Filing | Jan 30, 2026 | — |
| 8-A12G/A | Filing | Jan 30, 2026 | — |
| 8-K |
Current report
Material agreement, Change to shareholder rights
|
Jan 30, 2026 | Jan 30, 2026 |
| CORRESP | Letter to the SEC | Jan 28, 2026 | — |
| S-4 | Registration for a merger or exchange | Jan 28, 2026 | — |
| UPLOAD | Letter from the SEC | Dec 29, 2025 | — |
| 8-A12G/A | Filing | Dec 23, 2025 | — |
| 8-K |
Current report
Material agreement, Change to shareholder rights
|
Dec 23, 2025 | Dec 23, 2025 |
| DRS | Filing | Dec 19, 2025 | — |
| 10-Q | Quarterly report | Nov 12, 2025 | Sep 30, 2025 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Oct 24, 2025 | — |
| 425 | Filing | Oct 24, 2025 | — |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Oct 24, 2025 | Oct 24, 2025 |
| 8-A12G/A | Filing | Sep 30, 2025 | — |
| 8-K |
Current report
Material agreement, Change to shareholder rights
|
Sep 30, 2025 | Sep 30, 2025 |
| 8-A12G/A | Filing | Aug 14, 2025 | — |
| 10-Q | Quarterly report | Aug 14, 2025 | Jun 30, 2025 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Jun 23, 2025 | — |
| 425 | Filing | Jun 23, 2025 | — |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Jun 23, 2025 | Jun 20, 2025 |
| 10-Q | Quarterly report | May 9, 2025 | Mar 31, 2025 |
| 10-K/A | Amended annual report | Apr 28, 2025 | Dec 31, 2024 |
| 8-A12G/A | Filing | Apr 1, 2025 | — |
| 8-K |
Current report
Material agreement, Change to shareholder rights
|
Apr 1, 2025 | Mar 31, 2025 |
| 10-K | Annual report | Feb 21, 2025 | Dec 31, 2024 |
| 3 | Initial insider ownership | Jan 10, 2025 | Jan 7, 2025 |
| 8-K |
Current report
Officer or director change, Other events
|
Jan 10, 2025 | Jan 7, 2025 |
| 8-K |
Current report
Other events
|
Dec 27, 2024 | Dec 18, 2024 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Dec 19, 2024 | — |
| 10-Q | Quarterly report | Nov 5, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Shareholder vote results
|
Oct 1, 2024 | Sep 26, 2024 |
| SC 13D/A | Amended ownership over 5% (active) | Aug 19, 2024 | — |
| ARS | Annual report to shareholders | Aug 8, 2024 | Dec 31, 2023 |
| DEFA14A | Additional proxy material | Aug 8, 2024 | — |
| DEF 14A | Proxy statement | Aug 8, 2024 | Sep 26, 2024 |
| 10-Q | Quarterly report | Aug 8, 2024 | Jun 30, 2024 |
| PRE 14A | Preliminary proxy statement | Jul 29, 2024 | Sep 26, 2024 |
| 8-K/A | Amended current report | Jul 11, 2024 | Jul 2, 2024 |
| 8-K | Current report | Jul 2, 2024 | Jul 2, 2024 |
| 8-K |
Current report
Other events
|
Jun 14, 2024 | Jun 10, 2024 |
| 8-A12G/A | Filing | May 22, 2024 | — |
| 8-K |
Current report
Material agreement, Change to shareholder rights
|
May 22, 2024 | May 16, 2024 |
| 10-Q | Quarterly report | May 10, 2024 | Mar 31, 2024 |
| 10-K/A | Amended annual report | Apr 26, 2024 | Dec 31, 2023 |
| 10-K | Annual report | Mar 20, 2024 | Dec 31, 2023 |
| 8-K |
Current report
Other events
|
Jan 5, 2024 | Dec 31, 2023 |
| 10-Q | Quarterly report | Nov 9, 2023 | Sep 30, 2023 |
| 10-Q | Quarterly report | Aug 7, 2023 | Jun 30, 2023 |
| 4 | Insider transaction | Jun 16, 2023 | Jun 14, 2023 |
| 8-K |
Current report
Shareholder vote results
|
Jun 14, 2023 | Jun 8, 2023 |
| 10-Q | Quarterly report | May 5, 2023 | Mar 31, 2023 |
| ARS | Annual report to shareholders | Apr 20, 2023 | Dec 31, 2022 |
| DEFA14A | Additional proxy material | Apr 20, 2023 | — |
| DEF 14A | Proxy statement | Apr 20, 2023 | Jun 8, 2023 |
| 10-K | Annual report | Feb 16, 2023 | Dec 31, 2022 |
| 8-K |
Current report
Other events
|
Jan 6, 2023 | Dec 31, 2022 |
| 10-Q | Quarterly report | Nov 9, 2022 | Sep 30, 2022 |
| 10-Q | Quarterly report | Aug 4, 2022 | Jun 30, 2022 |
| 3 | Initial insider ownership | Jun 21, 2022 | Jun 9, 2022 |
| 8-K |
Current report
Shareholder vote results
|
Jun 15, 2022 | Jun 9, 2022 |
| 10-Q | Quarterly report | Apr 26, 2022 | Mar 31, 2022 |
| DEFA14A | Additional proxy material | Apr 22, 2022 | — |
| DEF 14A | Proxy statement | Apr 22, 2022 | Jun 9, 2022 |
| 10-K | Annual report | Feb 25, 2022 | Dec 31, 2021 |
| 10-Q | Quarterly report | Nov 5, 2021 | Sep 30, 2021 |
| 4 | Insider transaction | Aug 17, 2021 | Aug 13, 2021 |
| 10-Q | Quarterly report | Aug 5, 2021 | Jun 30, 2021 |
| 8-A12G/A | Filing | Jun 8, 2021 | — |
| 8-K |
Current report
Material agreement, Change to shareholder rights, Shareholder vote results
|
Jun 8, 2021 | Jun 2, 2021 |
| 10-Q | Quarterly report | May 4, 2021 | Mar 31, 2021 |
| DEFA14A | Additional proxy material | Apr 14, 2021 | — |
| DEF 14A | Proxy statement | Apr 14, 2021 | Jun 2, 2021 |
| PRE 14A | Preliminary proxy statement | Apr 2, 2021 | Jun 2, 2021 |
| 10-K | Annual report | Feb 23, 2021 | Dec 31, 2020 |
| 8-K |
Current report
Officer or director change
|
Jan 4, 2021 | Dec 30, 2020 |
| 8-K |
Current report
Shareholder vote results
|
Dec 21, 2020 | Dec 18, 2020 |
| 424B3 | Prospectus | Nov 24, 2020 | — |
| EFFECT | Filing | Nov 23, 2020 | — |
| 4 | Insider transaction | Nov 18, 2020 | Nov 16, 2020 |
| CORRESP | Letter to the SEC | Nov 18, 2020 | — |
| 4 | Insider transaction | Nov 17, 2020 | Nov 13, 2020 |
| UPLOAD | Letter from the SEC | Nov 17, 2020 | — |
| S-1 | Registration statement | Nov 12, 2020 | — |
| 10-Q | Quarterly report | Nov 9, 2020 | Sep 30, 2020 |
| DEFA14A | Additional proxy material | Nov 3, 2020 | — |
| DEF 14A | Proxy statement | Nov 3, 2020 | Dec 18, 2020 |
| 4 | Insider transaction | Oct 14, 2020 | Oct 9, 2020 |
| SC 13D/A | Amended ownership over 5% (active) | Oct 14, 2020 | — |
| 8-K |
Current report
Unregistered share sale, Other events
|
Oct 14, 2020 | Oct 9, 2020 |
| 8-K |
Current report
Change to shareholder rights, Bylaw or fiscal year change, Other events
|
Sep 23, 2020 | Sep 21, 2020 |
| 424B3 | Prospectus | Sep 23, 2020 | — |
| EFFECT | Filing | Sep 21, 2020 | — |
| SC 13D/A | Amended ownership over 5% (active) | Sep 17, 2020 | — |
| CORRESP | Letter to the SEC | Sep 17, 2020 | — |
| 8-K |
Current report
Other events
|
Sep 15, 2020 | Sep 15, 2020 |
| S-1/A | Amended registration statement | Sep 15, 2020 | — |
| UPLOAD | Letter from the SEC | Sep 8, 2020 | — |
| 8-K |
Current report
Other events
|
Sep 2, 2020 | Sep 2, 2020 |
| SC 13D/A | Amended ownership over 5% (active) | Sep 1, 2020 | — |
| 8-K |
Current report
Material agreement
|
Sep 1, 2020 | Sep 1, 2020 |
| S-1 | Registration statement | Sep 1, 2020 | — |
| 8-K |
Current report
Other events
|
Aug 31, 2020 | Aug 31, 2020 |
| 4 | Insider transaction | Aug 26, 2020 | Aug 24, 2020 |
| 3 | Initial insider ownership | Aug 18, 2020 | Aug 4, 2020 |
| 8-K |
Current report
Material agreement, Change to shareholder rights, Bylaw or fiscal year change, Other events
|
Aug 14, 2020 | Aug 14, 2020 |
| 8-A12G | Filing | Aug 14, 2020 | — |
| 3 | Initial insider ownership | Aug 14, 2020 | Aug 4, 2020 |
| SC 13D/A | Amended ownership over 5% (active) | Aug 7, 2020 | — |
| 8-K |
Current report
Officer or director change
|
Aug 7, 2020 | Aug 4, 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 | — |
| 10-Q | Quarterly report | Jul 29, 2020 | Jun 30, 2020 |
| 10-Q | Quarterly report | Apr 30, 2020 | Mar 31, 2020 |
| 10-K/A | Amended annual report | Apr 24, 2020 | Dec 31, 2019 |
| 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 | — |
| 10-K | Annual report | Feb 19, 2020 | Dec 31, 2019 |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 22, 2020 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 16, 2020 | — |
| 10-Q | Quarterly report | Nov 6, 2019 | Sep 30, 2019 |
| 8-K |
Current report
Shareholder vote results, Other events
|
Aug 22, 2019 | Aug 22, 2019 |
| 10-Q | Quarterly report | Aug 7, 2019 | Jun 30, 2019 |
| DEFA14A | Additional proxy material | Jul 12, 2019 | — |
| DEF 14A | Proxy statement | Jul 12, 2019 | Aug 22, 2019 |
| 10-Q | Quarterly report | May 8, 2019 | Mar 31, 2019 |
| 10-K/A | Amended annual report | Apr 25, 2019 | Dec 31, 2018 |
| 10-K | Annual report | Feb 21, 2019 | Dec 31, 2018 |
| 4 | Insider transaction | Feb 14, 2019 | Feb 11, 2019 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2019 | — |
| 8-K |
Current report
Other events
|
Feb 1, 2019 | Jan 30, 2019 |
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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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Source: SEC EDGAR filings. This is company-reported data, not investment advice.