United Maritime Corp (USEA) shareholders
Close on Nov 12, 2026Market cap $27.55MP/E –Yield –
Ownership
Institutional holdings as of Jun 30, 2026, from 13F filings
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 |
|---|---|---|---|---|
| Tsantanis Stamatios | 1,394,534 | 14.62% | 13D (active) amendment | Mar 9, 2026 |
Top institutional holders
13F holdings as of Jun 30, 2026
| Holder | Shares | % of USEA | Value | Change | % of portfolio |
|---|---|---|---|---|---|
| Renaissance Technologies LLC | 222,572 | 2.44% | $585.36K | −9,963 | 0.00% |
| UBS Group AG | 88,396 | 0.97% | $232.48K | +8,507 | 0.00% |
| NewEdge Advisors, LLC | 81,105 | 0.89% | $213.31K | +54,773 | 0.00% |
| Angeles Wealth Management, LLC | 77,052 | 0.84% | $210.35K | – | 0.01% |
| Acadian Asset Management LLC | 55,717 | 0.61% | $145.00K | – | 0.00% |
| Centiva Capital, LP | 28,814 | 0.32% | $75.78K | −1,557 | 0.00% |
| Focus Partners Wealth | 21,068 | 0.23% | $57.52K | −10,481 | 0.00% |
| Cetera Investment Advisers | 19,041 | 0.21% | $50.08K | – | 0.00% |
| Goldman Sachs Group Inc | 10,369 | 0.11% | $27.27K | −2,771 | 0.00% |
| Osaic Holdings, Inc. | 1,609 | 0.02% | $4.23K | −22 | 0.00% |
| SBI Securities Co., Ltd. | 1,318 | 0.01% | $3.47K | −1,112 | 0.00% |
| Morgan Stanley | 85 | 0.00% | $225 | – | 0.00% |
| Royal Bank of Canada | 59 | 0.00% | $0 | – | 0.00% |
| Caitong International Asset Management Co., Ltd | 6 | 0.00% | $16 | +2 | 0.00% |
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 2026 | 14 | 1M | 6.7% | 0 / 3 | 6 / 5 | 0M | 0M |
| Q1 2026 | 19 | 1M | 7.0% | 8 / 2 | 4 / 2 | 0M | 0M |
| Q4 2025 | 13 | 0M | 3.4% | 4 / 4 | 1 / 4 | 0M | 0M |
| Q3 2025 | 13 | 0M | 1.5% | 4 / 2 | 4 / 2 | 0M | 0M |
| Q2 2025 | 11 | 0M | 1.5% | 2 / 3 | 4 / 3 | 0M | 0M |
| Q1 2025 | 12 | 0M | 1.1% | 2 / 2 | 5 / 8 | 0M | 0M |
| Q4 2024 | 18 | 0M | 2.4% | 5 / 3 | 4 / 4 | 0M | 0M |
| Q3 2024 | 17 | 0M | 2.9% | 4 / 4 | 0 / 1 | 0M | 0M |
| Q2 2024 | 14 | 0M | 1.6% | 4 / 3 | 1 / 1 | 0M | 0M |
| Q1 2024 | 11 | 0M | 1.4% | 2 / 3 | 2 / 3 | 0M | 0M |
| Q4 2023 | 12 | 0M | 1.6% | 2 / 4 | 0 / 5 | 0M | 0M |
| Q3 2023 | 15 | 0M | 1.3% | 5 / 1 | 4 / 1 | 0M | 0M |
Officers, directors and major owners
People who filed Forms 3, 4 or 5 in the last two years
| Name | Role | Shares owned | % of shares | Latest filing |
|---|---|---|---|---|
| Stavros Gyftakis | See Remarks, Director | 241,678 | 2.65% | Oct 7, 2026 |
| Stamatios Tsantanis | Director, CEO | 1,394,534 | 15.28% | Mar 18, 2026 |
| Dimitrios Kostopoulos | Director | 335,000 | 3.67% | Aug 4, 2026 |
| Christina Anagnostara | Director | 245,231 | 2.69% | Mar 18, 2026 |
| Ioannis Kartsonas | Director | 148,567 | 1.63% | Mar 18, 2026 |
Insider trades
Common stock transactions reported on Form 4, newest first
| Insider | Date | Transaction | Shares | Price | Value | Shares after |
|---|---|---|---|---|---|---|
| Stavros Gyftakis See Remarks, Director | Oct 5, 2026 | Sale | −5,000 | $2.69 | $13.45K | 241,678 |
| Dimitrios Kostopoulos Director | Jul 31, 2026 | Buy | +15,000 | $2.74 | $41.10K | 335,000 |
| Stavros Gyftakis See Remarks, Director | Jul 13, 2026 | Sale | −5,000 | $2.64 | $13.20K | 246,678 |
| Dimitrios Kostopoulos Director | May 22, 2026 | Buy | +20,000 | $2.40 | $48.00K | 320,000 |
| Stavros Gyftakis See Remarks, Director | Apr 6, 2026 | Sale | −5,000 | $2.08 | $10.40K | 251,678 |
Awards, option exercises, tax withholding and gifts are shown alongside open-market buys and sales. Each name links to the filing on SEC EDGAR.
Short interest
Shares sold short and not yet bought back, as of Oct 30, 2026 (FINRA, reported twice a month)
Shares sold short, last 12 months
Short sale volume counts trades marked short on any given day, including market-maker hedging, so it runs far higher than the share of United Maritime's stock actually held short. Settlement fails (shares not delivered on time) peaked at 41,094 shares on Sep 25, 2026 over the last 90 days.
Planned insider sales
Notices of proposed sale filed on Form 144 before shares are sold
| Seller | Filed | Shares | Market value | Planned sale | Acquired through |
|---|---|---|---|---|---|
| Ioannis Kartsonas Director | Oct 11, 2023 | 93,000 | $237.00K | Oct 10, 2023 | STOCK AWARD |
| Ioannis Kartsonas Director | May 26, 2023 | 71,963 | $201.50K | May 25, 2023 | STOCK AWARD |
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