Seanergy Maritime Holdings Corp. has 5 Schedule 13D or 13G filings on record since 2025-08-04. 2 holders' latest filing reports 5% or more of common stock, par value $0.0001 per share. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Tsantanis Stamatios | 9.62% | 2,084,403 | SCHEDULE 13D/A, 2026-03-31 | 2026-03-06 |
| George Economou | 8.8% | 1,848,534 | SCHEDULE 13D/A, 2026-03-16 | 2026-03-16 |
| Konstantakopoulos Konstantinos | 4.9% | 1,063,079 | SCHEDULE 13G/A, 2026-09-21 | 2026-09-18 |
Purpose of Transaction (Item 4)
George Economou
Item 4 of the Initial 13D is hereby supplemented as set forth below. "As previously disclosed, on March 4, 2024, Sphinx, one of the Reporting Persons, commenced litigation in the Republic of the Marshall Islands against Stamatis Tsantanis, Christina Anagnostara, Dimitrios Anagnostopoulos, Elias Culucundis, Ioannis (John) Kartsonas and the Issuer by filing a complaint in the High Court of the Republic of the Marshall Islands (the "High Court"), seeking, among other things, to void and cancel the Series B Preferred Stock issued to Mr. Tsantanis, to cancel the certificate of designation for the Series B Preferred Stock, to prohibit Mr. Tsantanis from exercising the voting rights of the Series B Preferred Stock and to prohibit the Issuer from recognizing any such votes purportedly cast. The High Court rendered a decision in that case, dismissing Sphinx's complaint on the basis that Sphinx lacked standing to bring its claims, on October 28, 2024 and issued a corrected order amending that decision on October 30, 2024 and the Supreme Court of the Marshall Islands rendered a decision in the appeal of such case on February 20, 2026 affirming the High Court's dismissal. In light of the decision of the Supreme Court of the Marshall Islands, as of March 16, 2026, the Reporting Persons no longer intend to seek to change or influence the control of the Company or to change the Company's capital structure or corporate governance."Item 4 of the SCHEDULE 13D/A filed 2026-03-16
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-08-04 | Konstantakopoulos Konstantinos | 13.2% | SCHEDULE 13G/A |
| 2026-03-16 | George Economou | 8.8% | SCHEDULE 13D/A |
| 2026-03-31 | Tsantanis Stamatios | 9.62% | SCHEDULE 13D/A |
| 2026-04-08 | Konstantakopoulos Konstantinos | 10.2% | SCHEDULE 13G/A |
| 2026-09-21 | Konstantakopoulos Konstantinos | 4.9% | SCHEDULE 13G/A |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.