AmBase Corp SEC filings ABCP
AmBase Corp has 457 filings in SEC EDGAR's recent list, going back to Feb 12, 1996. Its latest annual report, Form 10-K, was filed on Mar 30, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Oct 28, 2026, covering the quarter ended Sep 30, 2026. The most recent current report (Form 8-K) was filed on Oct 13, 2026 (material agreement). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| SC 13D/A | Amended ownership over 5% (active) | May 1, 2024 | — |
| 4 | Insider transaction | May 1, 2024 | Apr 30, 2024 |
| 4 | Insider transaction | May 1, 2024 | Apr 29, 2024 |
| SC 13D/A | Amended ownership over 5% (active) | Apr 1, 2024 | — |
| SC 13D/A | Amended ownership over 5% (active) | Mar 26, 2024 | — |
| SC 13D/A | Amended ownership over 5% (active) | Mar 13, 2024 | — |
| SC 13D/A | Amended ownership over 5% (active) | Mar 8, 2024 | — |
| 4 | Insider transaction | Mar 7, 2024 | Feb 28, 2024 |
| SC 13D/A | Amended ownership over 5% (active) | Feb 23, 2024 | — |
| SC 13D/A | Amended ownership over 5% (active) | Feb 20, 2024 | — |
| 4 | Insider transaction | Feb 20, 2024 | Feb 15, 2024 |
| 4 | Insider transaction | Oct 11, 2023 | Oct 9, 2023 |
| 4 | Insider transaction | Sep 26, 2023 | Sep 22, 2023 |
| 4 | Insider transaction | Sep 12, 2023 | Sep 8, 2023 |
| SC 13D/A | Amended ownership over 5% (active) | Aug 29, 2023 | — |
| 4 | Insider transaction | Aug 29, 2023 | Aug 25, 2023 |
| 4 | Insider transaction | Aug 3, 2023 | Aug 1, 2023 |
| 4 | Insider transaction | Jun 29, 2023 | Jun 27, 2023 |
| 4 | Insider transaction | Jun 14, 2023 | Jun 12, 2023 |
| 4 | Insider transaction | Jun 9, 2023 | Jun 7, 2023 |
| 4 | Insider transaction | Jun 2, 2023 | Jun 1, 2023 |
| SC 13D/A | Amended ownership over 5% (active) | May 31, 2023 | — |
| 4 | Insider transaction | May 30, 2023 | May 26, 2023 |
| 4 | Insider transaction | May 26, 2023 | May 8, 2023 |
| 4 | Insider transaction | May 10, 2023 | May 8, 2023 |
| 4 | Insider transaction | Jan 30, 2023 | Jan 27, 2023 |
| 3 | Initial insider ownership | Jan 20, 2023 | Jan 20, 2023 |
| 4 | Insider transaction | Dec 29, 2022 | Dec 27, 2022 |
| 4 | Insider transaction | Dec 27, 2022 | Dec 23, 2022 |
| 4 | Insider transaction | Apr 12, 2022 | Apr 11, 2022 |
| 5 | Annual insider ownership | Feb 9, 2022 | Dec 31, 2021 |
| SC 13D/A | Amended ownership over 5% (active) | Feb 5, 2021 | — |
| 4 | Insider transaction | Jan 5, 2021 | Jan 5, 2021 |
| 4 | Insider transaction | May 22, 2020 | May 20, 2020 |
| 4 | Insider transaction | May 22, 2020 | May 20, 2020 |
| 3 | Initial insider ownership | Jan 9, 2020 | Dec 31, 2019 |
| SC 13D/A | Amended ownership over 5% (active) | Jan 8, 2020 | — |
| SC 13D | Ownership over 5% (active) | Jan 7, 2020 | — |
| 4 | Insider transaction | Jan 2, 2020 | Dec 30, 2019 |
| 4 | Insider transaction | Jun 5, 2019 | Jun 3, 2019 |
| SC 13D/A | Amended ownership over 5% (active) | Oct 17, 2018 | — |
| SC 13D/A | Amended ownership over 5% (active) | Sep 21, 2018 | — |
| 4 | Insider transaction | Sep 20, 2018 | Sep 18, 2018 |
| 4/A | Form 4/a | Sep 20, 2018 | Sep 7, 2018 |
| 4/A | Form 4/a | Sep 20, 2018 | Apr 30, 2018 |
| 4 | Insider transaction | Sep 11, 2018 | Sep 7, 2018 |
| 4/A | Form 4/a | May 3, 2018 | Apr 30, 2018 |
| 4 | Insider transaction | May 2, 2018 | Apr 30, 2018 |
| SC 13D/A | Amended ownership over 5% (active) | Feb 21, 2018 | — |
| 4 | Insider transaction | Dec 26, 2017 | Dec 21, 2017 |
| 4 | Insider transaction | Dec 6, 2017 | Dec 4, 2017 |
| 4 | Insider transaction | Nov 29, 2017 | Nov 27, 2017 |
| 4 | Insider transaction | Nov 14, 2017 | Oct 11, 2017 |
| SC 13D | Ownership over 5% (active) | Nov 14, 2017 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2017 | — |
| 4 | Insider transaction | Dec 12, 2016 | Dec 9, 2016 |
| 4 | Insider transaction | Dec 8, 2016 | Dec 7, 2016 |
| 3 | Initial insider ownership | Jun 30, 2016 | Jun 30, 2016 |
| 3 | Initial insider ownership | Jun 30, 2016 | Jun 30, 2016 |
| 4 | Insider transaction | Mar 2, 2016 | Feb 29, 2016 |
| 4 | Insider transaction | Feb 26, 2016 | Feb 24, 2016 |
| 4 | Insider transaction | Feb 19, 2016 | Feb 17, 2016 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 16, 2016 | — |
| 4 | Insider transaction | Jan 15, 2016 | Jan 13, 2016 |
| 4 | Insider transaction | Dec 28, 2015 | Dec 23, 2015 |
| 4 | Insider transaction | Dec 8, 2015 | Dec 4, 2015 |
| 4/A | Form 4/a | Nov 20, 2015 | Nov 13, 2015 |
| 4 | Insider transaction | Nov 17, 2015 | Nov 13, 2015 |
| 4 | Insider transaction | Nov 12, 2015 | Nov 9, 2015 |
| 4 | Insider transaction | Sep 30, 2015 | Sep 28, 2015 |
| 4 | Insider transaction | Aug 28, 2015 | Aug 26, 2015 |
| 4 | Insider transaction | Aug 18, 2015 | Aug 14, 2015 |
| 4 | Insider transaction | Aug 12, 2015 | Aug 10, 2015 |
| 4 | Insider transaction | Aug 3, 2015 | Jul 30, 2015 |
| 4 | Insider transaction | Jul 27, 2015 | Jul 23, 2015 |
| 4 | Insider transaction | Jul 23, 2015 | Jul 21, 2015 |
| 4 | Insider transaction | Jul 21, 2015 | Jul 16, 2015 |
| 4/A | Form 4/a | Jul 16, 2015 | Jul 14, 2015 |
| 4 | Insider transaction | Jul 10, 2015 | Jul 8, 2015 |
| SC 13G/A | Amended ownership over 5% (passive) | Jul 10, 2015 | — |
| 4 | Insider transaction | Jul 6, 2015 | Jul 1, 2015 |
| 4 | Insider transaction | Jun 29, 2015 | Jun 25, 2015 |
| 3 | Initial insider ownership | Jun 29, 2015 | Jun 23, 2015 |
| SC 13G | Ownership over 5% (passive) | Feb 17, 2015 | — |
| 4 | Insider transaction | Oct 17, 2014 | Oct 16, 2014 |
| 4 | Insider transaction | Jun 17, 2014 | Jun 13, 2014 |
| 4 | Insider transaction | Jun 13, 2014 | Jun 11, 2014 |
| 4 | Insider transaction | Jan 28, 2014 | Jan 24, 2014 |
| 4 | Insider transaction | Jul 25, 2013 | Jul 24, 2013 |
| 4 | Insider transaction | May 20, 2013 | May 10, 2013 |
| 4 | Insider transaction | Apr 10, 2013 | Apr 9, 2013 |
| 4 | Insider transaction | Apr 9, 2013 | Apr 8, 2013 |
| 4 | Insider transaction | Apr 8, 2013 | Apr 5, 2013 |
| 4 | Insider transaction | Apr 4, 2013 | Apr 4, 2013 |
| 3 | Initial insider ownership | Mar 18, 2013 | Mar 18, 2013 |
| 3 | Initial insider ownership | Mar 18, 2013 | Mar 18, 2013 |
| 4/A | Primary document | Sep 18, 2012 | Sep 18, 2012 |
| 4 | Insider transaction | Sep 18, 2012 | Sep 18, 2012 |
| 4 | Insider transaction | Sep 18, 2012 | Sep 18, 2012 |
| 4 | Insider transaction | Sep 18, 2012 | Sep 18, 2012 |
| 3 | Initial insider ownership | Aug 31, 2012 | Aug 31, 2012 |
| 4 | Insider transaction | Jan 4, 2012 | Dec 30, 2011 |
| 4 | Insider transaction | Jan 4, 2012 | Dec 30, 2011 |
| 4/A | Primary document | Jul 31, 2009 | Jun 26, 2009 |
| 4 | Insider transaction | Jul 6, 2009 | Jul 2, 2009 |
| 4 | Insider transaction | Jul 1, 2009 | Jun 26, 2009 |
| 3 | Initial insider ownership | Mar 26, 2009 | Mar 16, 2009 |
| SC 13D | Ownership over 5% (active) | Mar 26, 2009 | — |
| 3 | Initial insider ownership | Mar 26, 2009 | Mar 16, 2009 |
| 3 | Initial insider ownership | Mar 26, 2009 | Mar 16, 2009 |
| 3 | Initial insider ownership | Mar 26, 2009 | Mar 16, 2009 |
| SC 13D/A | Amended ownership over 5% (active) | Mar 19, 2009 | — |
| 4 | Insider transaction | Mar 18, 2009 | Mar 16, 2009 |
| 3 | Initial insider ownership | Jan 26, 2009 | Jan 23, 2009 |
| 4 | Insider transaction | Dec 10, 2008 | Dec 9, 2008 |
| 4 | Insider transaction | Dec 5, 2008 | Dec 4, 2008 |
| 4 | Insider transaction | Oct 16, 2008 | Oct 15, 2008 |
| 4 | Insider transaction | Jun 9, 2008 | Jun 6, 2008 |
| 4 | Insider transaction | Apr 8, 2008 | Apr 7, 2008 |
| 3 | Initial insider ownership | Mar 20, 2008 | Feb 1, 2007 |
| 4 | Insider transaction | Aug 21, 2007 | Aug 21, 2007 |
| 4 | Insider transaction | Jul 31, 2007 | Jul 31, 2007 |
| 4 | Insider transaction | Jun 15, 2007 | Jun 15, 2007 |
| SC 13D/A | Amended ownership over 5% (active) | Oct 27, 2006 | — |
| SC 13D/A | Amended ownership over 5% (active) | Oct 27, 2006 | — |
| 4 | Insider transaction | Oct 24, 2006 | Oct 23, 2006 |
| 4 | Insider transaction | Oct 24, 2006 | Oct 23, 2006 |
| 4 | Insider transaction | Oct 23, 2006 | Oct 19, 2006 |
| SC 13D/A | Amended ownership over 5% (active) | Oct 19, 2006 | — |
| 3 | Initial insider ownership | Feb 2, 2006 | Feb 2, 2006 |
| 3 | Initial insider ownership | Jan 10, 2006 | Jan 10, 2006 |
| SC 13D/A | Amended ownership over 5% (active) | Oct 5, 2005 | — |
| SC 13D/A | Amended ownership over 5% (active) | Oct 5, 2005 | — |
| 4 | Insider transaction | Jan 5, 2005 | Jan 3, 2005 |
| 4 | Insider transaction | Jan 5, 2005 | Jan 5, 2005 |
| 4 | Insider transaction | Dec 28, 2004 | Dec 28, 2004 |
| SC 13D | Ownership over 5% (active) | Mar 23, 2004 | — |
| 3 | Initial insider ownership | Mar 23, 2004 | Mar 22, 2004 |
| SC 13D | Ownership over 5% (active) | Mar 23, 2004 | — |
| 4 | Insider transaction | Feb 12, 2004 | Feb 11, 2004 |
| 4 | Insider transaction | Jan 8, 2004 | Jan 6, 2004 |
| 4 | Insider transaction | Jan 8, 2004 | Jan 6, 2004 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 11, 2002 | — |
| 4 | Insider transaction | Jan 10, 2002 | Dec 31, 2001 |
| 3 | Initial insider ownership | Sep 17, 2001 | Sep 6, 2001 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 15, 2001 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2001 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 22, 2000 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2000 | — |
| SC 13D | Ownership over 5% (active) | Oct 6, 1999 | — |
| SC 13G | Ownership over 5% (passive) | May 28, 1999 | — |
| SC 13D | Ownership over 5% (active) | May 3, 1999 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 16, 1999 | — |
| SC 13D | Ownership over 5% (active) | Feb 2, 1999 | — |
| SC 13D/A | Amended ownership over 5% (active) | Oct 14, 1998 | — |
| SC 13D | Ownership over 5% (active) | Oct 13, 1998 | — |
| SC 13G | Ownership over 5% (passive) | Apr 24, 1998 | — |
| SC 13D/A | Amended ownership over 5% (active) | Apr 22, 1998 | — |
| SC 13D/A | Amended ownership over 5% (active) | Apr 3, 1998 | — |
| SC 13D | Ownership over 5% (active) | May 9, 1997 | — |
| SC 13D | Ownership over 5% (active) | Feb 18, 1997 | — |
| SC 13D/A | Amended ownership over 5% (active) | Jan 28, 1997 | — |
| SC 13D/A | Amended ownership over 5% (active) | Dec 19, 1996 | — |
| SC 13D | Ownership over 5% (active) | Dec 13, 1996 | — |
| SC 13D | Ownership over 5% (active) | Jul 18, 1996 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 12, 1996 | — |
Showing 166 filings. 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
- Opeators of Nonresidential Buildings (SIC 6512)
- Listed as
- ABCP (OTC)
- Fiscal year ends
- December 31
- Headquarters
- Coral Springs, FL
- SEC filer status
- Non-accelerated filer, Smaller reporting company
- SEC CIK
- 20639
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.