AmBase CorporationSEC Filings
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All SEC filings by AmBase Corporation (ABCP) — annual and quarterly reports, current reports, registrations, proxies and ownership forms, updated in real time.
Financials
| 10-Q | Quarterly report | View Diff | Aug 12, 2026 | |
| 10-Q | Quarterly report | View Diff | May 11, 2026 | |
| 10-K | Annual report | View Diff | Mar 30, 2026 | |
| 10-Q | Quarterly report | View Diff | Nov 6, 2025 | |
| 10-Q | Quarterly report | View Diff | Aug 13, 2025 | |
| 10-Q | Quarterly report | View Diff | May 13, 2025 | |
| 10-K | Annual report | View Diff | Mar 24, 2025 | |
| 10-Q | Quarterly report | View Diff | Nov 13, 2024 | |
| 10-Q | Quarterly report | View Diff | Aug 9, 2024 | |
| 10-Q | Quarterly report | View Diff | May 9, 2024 |
Events
| 8-K | Current report | Jul 31, 2026 | ||
| 8-K | Submission of Matters to a Vote of Security Holders | May 29, 2026 | ||
| 8-K | Entry Into a Material Definitive Agreement | Mar 4, 2026 | ||
| 8-K | Entry Into a Material Definitive Agreement | Feb 25, 2026 | ||
| 8-K | Entry Into a Material Definitive Agreement | Jan 29, 2026 | ||
| 8-K | Departure of Directors or Certain Officers | Jan 21, 2026 | ||
| 8-K | Entry Into a Material Definitive Agreement | Dec 19, 2025 | ||
| 8-K | Entry Into a Material Definitive Agreement | Nov 26, 2025 | ||
| 8-K | Entry Into a Material Definitive Agreement | Sep 29, 2025 | ||
| 8-K | Entry Into a Material Definitive Agreement | Sep 11, 2025 |
Registrations and Prospectuses
| S-8 | Registration of securities for employees | Feb 28, 1997 |
Proxies
| DEF 14A | Definitive proxy | View Diff | Mar 31, 2026 | |
| DEFA14A | Additional proxy soliciting materials | Apr 23, 2025 | ||
| DEF 14A | Definitive proxy | View Diff | Mar 25, 2025 | |
| DEFA14A | Additional proxy soliciting materials | Apr 3, 2024 | ||
| DEF 14A | Definitive proxy | View Diff | Apr 3, 2024 | |
| PRE 14A | Preliminary proxy | Mar 22, 2024 | ||
| DEF 14A | Definitive proxy | View Diff | Mar 30, 2023 | |
| DEF 14A | Definitive proxy | View Diff | Mar 29, 2022 | |
| DEF 14A | Definitive proxy | View Diff | Mar 26, 2021 | |
| DEFA14A | Additional proxy soliciting materials | May 19, 2020 |
Other
| UPLOAD | Letter from SEC | Jan 30, 2014 | ||
| CORRESP | Correspondence with SEC | Jan 17, 2014 | ||
| UPLOAD | Letter from SEC | Dec 16, 2013 | ||
| UPLOAD | Letter from SEC | Jan 18, 2013 | ||
| CORRESP | Correspondence with SEC | Jan 4, 2013 | ||
| UPLOAD | Letter from SEC | Dec 20, 2012 | ||
| UPLOAD | Letter from SEC | Jan 22, 2010 | ||
| CORRESP | Correspondence with SEC | Dec 18, 2009 | ||
| UPLOAD | Letter from SEC | Dec 4, 2009 | ||
| UPLOAD | Letter from SEC | May 10, 2007 |
Ownership
| SC 13D/A | Beneficial ownership report | May 1, 2024 | ||
| 4 | Barc Investments Llc | May 1, 2024 | ||
| 4 | Jerry Y Carnegie | May 1, 2024 | ||
| SC 13D/A | Beneficial ownership report | Apr 1, 2024 | ||
| SC 13D/A | Ambase Corp | Mar 26, 2024 | ||
| SC 13D/A | Ambase Corp | Mar 13, 2024 | ||
| SC 13D/A | Beneficial ownership report | Mar 8, 2024 | ||
| 4 | Barc Investments Llc | Mar 7, 2024 | ||
| SC 13D/A | Ambase Corp | Feb 23, 2024 | ||
| SC 13D/A | Ambase Corp | Feb 20, 2024 |