Ownership

Who owns Seanergy Maritime Holdings Corp., from the filings themselves: stakes over 5% (Schedule 13D/G), the institutional managers reporting the stock each quarter (13F), and the funds holding it (N-PORT).

Stakes over 5%

Investors crossing 5% ownership must disclose it. Schedule 13G filers certify the stake is passive; Schedule 13D is the general form for everyone else — founders, strategic holders, and activists alike. Each entry is the holder's most recent disclosure. Coverage begins with SEC's structured filings from December 18, 2024; a holder appears once they file or amend after that date.

Konstantakopoulos Konstantinos, Longshaw Maritime Investments S.A. April 08, 2026

Konstantakopoulos Konstantinos: 10.2% · 2,203,714 shares — Longshaw Maritime Investments S.A.: 10.2% · 2,203,714 shares

View filing (SCHEDULE 13G/A) Amendment #4

Tsantanis Stamatios March 31, 2026

Tsantanis Stamatios: 9.6% · 2,084,403 shares

View filing (SCHEDULE 13D/A) Amendment #3

1 more 5% stakes behind a free account

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Super investors holding SHIP

Every institutional manager whose latest 13F reports this stock, largest position first. "% of their portfolio" is the weight inside that manager's own book — how much conviction the position represents; "% of company" is how much of Seanergy Maritime Holdings Corp. they hold. Together these 87 managers report 25.69% of shares outstanding.

Investor	Position value	Shares	% of their portfolio	% of company	As of
GOLDMAN SACHS GROUP INC	$10.2M	757,938	0.00%	3.70%	June 30, 2026
RENAISSANCE TECHNOLOGIES LLC	$8.18M	609,100	0.01%	2.98%	June 30, 2026

85 more institutional holders behind a free account

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Funds holding SHIP

Funds disclosing this stock in their monthly N-PORT portfolio, with the position's share of the fund's net assets. Together these 3 funds hold 0.71% of shares outstanding — counted inside the manager totals above, not on top of them, since a fund's shares also appear in its manager's 13F.

Fund	Position value	% of net assets	% of company	As of
AUER GROWTH	$1.87M	2.57%	0.64%	February 28, 2026
ACUITAS US MICROCAP FUND	$197K	0.17%	0.07%	June 30, 2026

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