AmBase Corp
ABCP- Exchange
- OTC
- Industry
- Opeators of Nonresidential Buildings
- SEC CIK
- 0000020639
No open-market purchases or sales by AmBase Corp insiders were filed in the last 90 days; no institution reported holding it in 13F filings for Q2 2026; no superinvestor holds it.
Holders of 5% or more of ABCP
Holders whose latest Schedule 13D or 13G filing reports 5% or more of AmBase Corp, largest stake first. The change is against the holder's previous filing.
No holder currently reports owning 5% or more of AmBase Corp on Schedule 13D or 13G.
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
10 Schedule 13D and 13G filings on AmBase Corp, newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| May 1, 2024 | Barc Investments LLC | 13D/AOld format | – | – | – | SEC |
| Apr 1, 2024 | Barc Investments LLC | 13D/AOld format | – | – | – | SEC |
| Mar 26, 2024 | Camac Fund, LP | 13D/AOld format | – | – | – | SEC |
| Mar 13, 2024 | Camac Fund, LP | 13D/AOld format | – | – | – | SEC |
| Mar 8, 2024 | Barc Investments LLC | 13D/AOld format | – | – | – | SEC |
| Feb 23, 2024 | Camac Fund, LP | 13D/AOld format | – | – | – | SEC |
| Feb 20, 2024 | Camac Fund, LP | 13D/AOld format | – | – | – | SEC |
| Aug 29, 2023 | Camac Fund, LP | 13D/AOld format | – | – | – | SEC |
| May 31, 2023 | Camac Fund, LP | 13D/AOld format | – | – | – | SEC |
| Feb 5, 2021 | Camac Fund, LP | 13D/AOld format | – | – | – | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell AmBase Corp shares.
No Form 144 notices for AmBase Corp are on file.