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Costamare Bulkers Holdings CMDB

US equityMarket cap rank #3709Marine Shipping

$21.61 +$0.74 (+3.52%)

Market open · Oct 8, 10:00 am ET · After hours $20.87 0.00%

Open$21.10

Prev close$20.87

Day range$20.66 – $21.61

Volume18.2K

Market cap$525.03M

P/E (TTM)122.8

Dividend yield–

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Institutional ownership21.3%-0.01 pts vs. prior quarter

Institutions holding130+1 vs. prior quarter

Insider trades (recent)1 buys / 1 sellsBalanced

Short interest1.15% of floatDays to cover 4.0 · as of 15 Sep 2026

Short-sale volume share21.1%5-day average of daily volume

Short-sale volume as % of daily volume

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: +$233.4K (10 inflow days, 10 outflow days).

Net flow by order size, last 20 sessions

Super/Big orders approximate institutional-size trades; Mid/Small approximate retail-size trades. Net buy minus sell value in each bucket, summed over the window.

The five largest holders on file together own 58.5% of shares outstanding.

Largest holders

Achillefs Konstantakopoulos18.05%
Konstantinos Konstantakopoulos17.16%
Christos Konstantakopoulos15.68%
Dimensional Fund Advisors5.33%
BlackRock2.29%
Columbia Management Investment Advisers, LLC1.75%
American Century Investment Management1.31%
Oceanic Investment Management Limited1.14%

By investor type

Individual/Insider50.90%
Mutual Fund16.40%
Hedge Fund3.84%
Public Company0.68%
Government Pension Fund0.17%
Insurance Company0.08%
Private Company0.08%
Family Office/Trust0.00%

Reported short interest has risen from 0.78% to 1.15% of float over the last 6 biweekly reports (30 Jun 2026 to 15 Sep 2026).

Recent institutional activity

Holder	Type	Period	Share change	New stake
Nuveen Asset Management LLC	Insurance Company	2026/Q3	+19,600	0.1%
Columbia Management Investment Advisers, LLC	Mutual Fund	2026/Q3	+48,011	1.8%
Jacobs Levy Equity Management Inc	Mutual Fund	2026/Q3	+37,842	0.2%
Two Sigma Investments, LP	Hedge Fund	2026/Q3	+36,131	0.3%
STRS Ohio	Government Pension Fund	2026/Q3	+34,900	0.2%
Boothbay Fund Management, LLC	Hedge Fund	2026/Q3	+22,101	0.5%
Oceanic Investment Management Limited	Hedge Fund	2026/Q3	+22,101	1.1%
Arax Advisory Partners, LLC	Mutual Fund	2026/Q3	+20,998	0.1%
BlackRock	Mutual Fund	2026/Q3	+16,567	2.3%
Citigroup Inc.	Public Company	2026/Q3	+15,460	0.1%
Quantinno Capital Management LP	Mutual Fund	2026/Q3	+12,653	0.3%
AQR Capital Management	Hedge Fund	2026/Q3	+12,258	0.1%
Squarepoint OPS LLC	Hedge Fund	2026/Q3	+10,797	0.0%
Algert Global LLC	Hedge Fund	2026/Q3	+10,454	0.0%
Geode Capital Management, LLC	Mutual Fund	2026/Q3	+7,327	0.5%

Institutional buy/sell activity by reporting period, largest moves first.

Insider transactions

Date	Insider	Title	Transaction	Shares	Price	Held after
5 Aug 2026	Gregory Zikos	Chief Executive Officer	Open Market Disposition	-24,203	$18.30	–
26 Mar 2026	Katerina Eleftheriou	Independent Director	Open Market Acquisition	+65	$15.11	865
17 Mar 2026	Gregory Zikos	Chief Executive Officer	Initial Statement of Beneficial	+0	–	24,203
17 Mar 2026	Katerina Eleftheriou	Independent Director	Initial Statement of Beneficial	+0	–	800
17 Mar 2026	Peter Lund	Director	Initial Statement of Beneficial	+0	–	3,738
17 Mar 2026	David Grant	Independent Director	Initial Statement of Beneficial	+0	–	800

From Form 4/Form 144 filings. Negative share counts are disposals (sales, gifts, or shares withheld for taxes); positive are acquisitions.

Short interest, by report

Report date	Shares short	% of float	Days to cover
15 Sep 2026	279,734	1.2%	4.0
31 Aug 2026	244,333	1.0%	2.7
14 Aug 2026	246,240	1.0%	2.9
31 Jul 2026	217,484	0.9%	4.1
15 Jul 2026	235,118	1.0%	2.9
30 Jun 2026	189,573	0.8%	2.4

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