Seanergy Maritime Holdings Corp.
SHIP- Exchange
- Nasdaq
- Industry
- Deep Sea Foreign Transportation of Freight
- SEC CIK
- 0001448397
In the last 90 days, Seanergy Maritime Holdings Corp. insiders filed 0 open-market purchases and 2 sales; 76 institutions reported holding it in 13F filings for Q2 2026, worth $68.2M in total; no superinvestor holds it.
Holders of 5% or more of SHIP
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Seanergy Maritime Holdings Corp., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Konstantakopoulos Konstantinos | 13G/A | 13.20%2.76M shares | +2.30 ppfrom 10.90% | Jan 8, 20253 filings | Aug 4, 2025 | SEC |
| Tsantanis Stamatios | 13D/A | 9.62%2.08M shares | +1.29 ppfrom 8.33% | Feb 28, 20252 filings | Mar 31, 2026 | SEC |
| Economou George | 13D/A | 8.80%1.85M shares | – | Mar 16, 20261 filing | Mar 16, 2026 | SEC |
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
6 Schedule 13D and 13G filings on Seanergy Maritime Holdings Corp., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Mar 31, 20264:05 PM ET | Tsantanis Stamatios | 13D/A | 9.62%2.08M shares | +1.29 ppfrom 8.33% | Mar 6, 2026 | SEC |
| Mar 16, 20268:40 AM ET | Economou Georgeand 2 others | 13D/A | 8.80%1.85M shares | – | Mar 16, 2026 | SEC |
| Aug 4, 20254:43 PM ET | Konstantakopoulos Konstantinosand 1 other | 13G/A | 13.20%2.76M shares | +2.30 ppfrom 10.90% | Jun 30, 2025 | SEC |
| Mar 13, 20254:14 PM ET | Konstantakopoulos Konstantinosand 1 other | 13G/A | 10.90%2.22M shares | +1.90 ppfrom 9.00% | Mar 11, 2025 | SEC |
| Feb 28, 20254:37 PM ET | Tsantanis Stamatios | 13D/A | 8.33%1.70M shares | – | Feb 28, 2025 | SEC |
| Jan 8, 20254:25 PM ET | Konstantakopoulos Konstantinosand 1 other | 13G | 9.00%1.84M shares | New | Dec 31, 2024 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Seanergy Maritime Holdings Corp. shares.
No Form 144 notices for Seanergy Maritime Holdings Corp. are on file.