ABCPOTCOpeators of Nonresidential BuildingsFiscal year ends December 31
AmBase Corp
Financials through Q2 FY2026, quarter ended Jun 30, 2026Last filing: 10-Q on Aug 12, 2026
$0.16−0.05 (-23.10%)
Close on Oct 19, 2026
- Market cap
- $13.68M
- P/E (TTM)
- –
- Dividend yield
- –
Ownership
Institutional holdings as of Jun 30, 2025, from 13F filings
Held by institutions
0.0%
0M of 85M shares
Institutional holders
0
0 new, 1 sold out
Net institutional buying
-0M
In Q2 2025
Insider trades, 12 months
0 buys · 0 sales
Open-market trades only
Shares held by institutions
Holders of more than 5%
Latest Schedule 13D (active) or 13G (passive) filed by each holder
| Holder | Shares | % of class | Filing | As of |
|---|---|---|---|---|
| Richard A. Bianco, Jr. | 59,860,151 | 70.50% | 13D (active) amendment | Apr 30, 2024 |
Institutional buying and selling by quarter
Positions opened, added to, reduced and closed by 13F filers
| Quarter | Holders | Shares held | % of shares | New / added | Reduced / closed | Shares bought | Shares sold |
|---|---|---|---|---|---|---|---|
| Q2 2025 | 0 | 0M | 0.0% | 0 / 0 | 0 / 1 | 0M | 0M |
| Q1 2025 | 1 | 0M | 0.0% | 0 / 0 | 0 / 0 | 0M | 0M |
| Q4 2024 | 1 | 0M | 0.0% | 1 / 0 | 0 / 0 | 0M | 0M |
| Q2 2024 | 0 | 0M | 0.0% | 0 / 0 | 0 / 2 | 0M | 0M |
| Q1 2024 | 2 | 0M | 0.4% | 0 / 0 | 0 / 1 | 0M | 0M |
| Q4 2023 | 3 | 0M | 0.4% | 2 / 0 | 0 / 0 | 0M | 0M |
| Q3 2023 | 1 | 0M | 0.4% | 0 / 0 | 0 / 0 | 0M | 0M |
| Q2 2023 | 1 | 0M | 0.4% | 0 / 0 | 0 / 0 | 0M | 0M |
| Q1 2023 | 1 | 0M | 0.4% | 0 / 0 | 0 / 0 | 0M | 0M |
| Q4 2022 | 1 | 0M | 0.4% | 0 / 0 | 0 / 0 | 0M | 0M |
| Q3 2022 | 1 | 0M | 0.4% | 0 / 0 | 0 / 0 | 0M | 0M |
| Q2 2022 | 1 | 0M | 0.4% | 0 / 0 | 0 / 1 | 0M | 0M |
Top mutual fund and ETF holders
Latest monthly portfolio reports (Form N-PORT)
| Fund | Shares | % of ABCP | Value | % of fund | As of |
|---|---|---|---|---|---|
| TETON Westwood Mighty Mites Fund | 105,000 | 0.12% | $28.88K | 0.01% | Jun 30, 2026 |
Insider trades
Common stock transactions reported on Form 4, newest first
| Insider | Date | Transaction | Shares | Price | Value | Shares after |
|---|---|---|---|---|---|---|
| Investments LLC Barc 10% owner | Apr 30, 2024 | Buy | +909,691 | $0.21 | $191.04K | 59,860,151 |
| Investments LLC Barc 10% owner | Feb 28, 2024 | Buy | +44,200,460 | $0.20 | $8.84M | 60,200,460 |
| Camac Fund, LP 10% owner | Feb 20, 2024 | Sale | −1,102,170 | $0.22 | $242.48K | 4,227,465 |
| Camac Fund, LP 10% owner | Feb 16, 2024 | Sale | −1,693,021 | $0.25 | $423.26K | 5,329,635 |
| Camac Fund, LP 10% owner | Feb 15, 2024 | Sale | −383,116 | $0.25 | $95.78K | 7,022,656 |
| Camac Fund, LP 10% owner | Oct 9, 2023 | Sale | −50,000 | $0.15 | $7.50K | 7,405,772 |
| Camac Fund, LP 10% owner | Sep 22, 2023 | Sale | −70,000 | $0.16 | $11.20K | 7,455,772 |
| Camac Fund, LP 10% owner | Sep 8, 2023 | Sale | −50,000 | $0.15 | $7.50K | 7,525,772 |
| Camac Fund, LP 10% owner | Aug 25, 2023 | Sale | −100,000 | $0.15 | $15.00K | 7,575,772 |
| Richard A. Bianco CEO, Director | Aug 1, 2023 | Gift | −700,000 | – | – | 202,547 |
| Richard A. Bianco CEO, Director | Aug 1, 2023 | Gift | +700,000 | – | – | 1,420,000 |
| Camac Fund, LP 10% owner | Jun 27, 2023 | Sale | −202,500 | $0.15 | $30.38K | 7,675,772 |
| Camac Fund, LP 10% owner | Jun 14, 2023 | Sale | −12,000 | $0.15 | $1.80K | 7,878,272 |
| Camac Fund, LP 10% owner | Jun 12, 2023 | Sale | −100,000 | $0.15 | $15.00K | 7,890 |
| Camac Fund, LP 10% owner | Jun 7, 2023 | Sale | −15,000 | $0.15 | $2.25K | 7,990 |
| Richard A. Bianco CEO, Director | May 26, 2023 | Buy | +745,000 | $74500.00 | $55.50B | 1,622,547 |
| Camac Fund, LP 10% owner | May 26, 2023 | Sale | −1,000,000 | $0.10 | $100.00K | 8,005,272 |
| Camac Fund, LP 10% owner | May 24, 2023 | Sale | −12,000 | $0.10 | $1.20K | 9,005,272 |
| Camac Fund, LP 10% owner | May 9, 2023 | Sale | −20,000 | $0.10 | $2.00K | 9,017,272 |
| Camac Fund, LP 10% owner | May 8, 2023 | Sale | −10,000 | $0.11 | $1.10K | 9,037,272 |
| Camac Fund, LP 10% owner | Jan 27, 2023 | Sale | −50,000 | $0.10 | $5.00K | 9,055,909 |
| Camac Fund, LP 10% owner | Dec 27, 2022 | Sale | −5,000 | $0.10 | $500 | 9,105,909 |
| Camac Fund, LP 10% owner | Dec 23, 2022 | Sale | −80,000 | $0.11 | $8.80K | 9,110,909 |
| Camac Fund, LP 10% owner | Apr 11, 2022 | Sale | −100,000 | $0.36 | $36.00K | 9,190,909 |
| Richard A. Bianco CEO, Director | Jun 17, 2021 | Gift | +720,000 | – | – | 157,547 |
| Richard A. Bianco CEO, Director | Jun 17, 2021 | Gift | −720,000 | – | – | 157,547 |
| Camac Fund, LP 10% owner | Jan 5, 2021 | Sale | −606,060 | $0.33 | $200.00K | 9,290,909 |
| Richard A. Bianco President & CEO, Director | May 20, 2020 | Buy | +100,000 | $0.18 | $18.00K | 877,547 |
| Jerry Y. Carnegie Director | May 20, 2020 | Buy | +71,898 | $0.18 | $12.94K | 71,898 |
| Brian L. Sheehy 10% owner | Dec 30, 2019 | Sale | −9,896,969 | $0.16 | $1.58M | 0 |
| Brian L. Sheehy 10% owner | Jun 5, 2019 | Sale | −12,000 | $0.40 | $4.80K | 9,896,969 |
| Brian L. Sheehy 10% owner | Jun 4, 2019 | Sale | −5,100 | $0.40 | $2.04K | 9,908,969 |
| Brian L. Sheehy 10% owner | Jun 3, 2019 | Sale | −250,000 | $0.37 | $92.50K | 9,914,069 |
| Capital Lp Iszo 10% owner | Sep 18, 2018 | Sale | −158,416 | $0.54 | $85.54K | 10,164,069 |
| Brian L. Sheehy 10% owner | Sep 7, 2018 | Buy | +219,534 | $0.52 | $114.16K | 10,322,485 |
| Capital Management Lp Iszo 10% owner | Sep 7, 2018 | Buy | +219,534 | $0.52 | $114.16K | 10,312,485 |
| Capital Lp Iszo 10% owner | May 2, 2018 | Buy | +131,500 | $0.52 | $68.38K | 10,102,951 |
| Capital Management Lp Iszo 10% owner | May 2, 2018 | Buy | +121,500 | $0.52 | $63.18K | 10,092,951 |
| Capital Management Lp Iszo 10% owner | May 2, 2018 | Buy | +121,500 | $0.52 | $63.18K | 10,817,451 |
| Capital Lp Iszo 10% owner | May 1, 2018 | Buy | +75,000 | $0.50 | $37.50K | 9,971,451 |
| Capital Management Lp Iszo 10% owner | May 1, 2018 | Buy | +75,000 | $0.50 | $37.50K | 9,971,451 |
| Capital Management Lp Iszo 10% owner | May 1, 2018 | Buy | +500,000 | $0.50 | $250.00K | 10,695,951 |
| Capital Lp Iszo 10% owner | Apr 30, 2018 | Buy | +200,500 | $0.45 | $90.23K | 9,896,451 |
| Capital Management Lp Iszo 10% owner | Apr 30, 2018 | Buy | +200,500 | $0.45 | $90.23K | 9,896,451 |
| Capital Management Lp Iszo 10% owner | Apr 30, 2018 | Buy | +500,000 | $0.45 | $225.00K | 10,195,951 |
| Capital Management Lp Iszo 10% owner | Dec 21, 2017 | Buy | +450,000 | $0.28 | $126.00K | 9,695,951 |
| Capital Management Lp Iszo 10% owner | Dec 4, 2017 | Buy | +145,000 | $0.27 | $39.15K | 9,245,951 |
| Capital Management Lp Iszo 10% owner | Nov 27, 2017 | Buy | +425,000 | $0.25 | $106.25K | 9,100,951 |
| Capital Management Lp Iszo 10% owner | Nov 1, 2017 | Buy | +335,000 | $0.28 | $93.80K | 8,675,951 |
| Capital Management Lp Iszo 10% owner | Oct 23, 2017 | Buy | +268,000 | $0.28 | $75.04K | 8,340,951 |
| Capital Management Lp Iszo 10% owner | Oct 16, 2017 | Buy | +37,315 | $0.29 | $10.82K | 8,072,951 |
| Capital Management Lp Iszo 10% owner | Oct 13, 2017 | Buy | +153,491 | $0.30 | $46.05K | 8,035,636 |
| Capital Management Lp Iszo 10% owner | Oct 11, 2017 | Buy | +39,360 | $0.28 | $11.02K | 7,882,145 |
| Joseph R. Bianco Treasurer | Dec 9, 2016 | Buy | +7,000 | $0.87 | $6.09K | 50,000 |
| Joseph R. Bianco Treasurer | Dec 7, 2016 | Buy | +100 | $0.85 | $85 | 33,100 |
| Joseph R. Bianco Treasurer | Dec 7, 2016 | Buy | +9,900 | $0.86 | $8.51K | 43,000 |
| Capital Gp Llc Iszo 10% owner | Feb 29, 2016 | Buy | +13,800 | $1.80 | $24.84K | 7,809,985 |
| Brian L. Sheehy 10% owner | Feb 24, 2016 | Buy | +35,000 | $1.95 | $68.25K | 7,796,185 |
| Capital Management Lp Iszo 10% owner | Feb 17, 2016 | Buy | +32,000 | $1.90 | $60.80K | 7,761,185 |
| Capital Management Lp Iszo 10% owner | Jan 14, 2016 | Buy | +8,500 | $2.10 | $17.85K | 7,729,185 |
Awards, option exercises, tax withholding and gifts are shown alongside open-market buys and sales. Each name links to the filing on SEC EDGAR.