Star Bulk CSO buys 3,000 shares in Greece offering

Star Bulk’s Chief Strategy Officer directly bought 3,000 SBLK shares in a Greek parallel offering tied to the company’s dual listing on Euronext Athens.

Rhea-AI Filing Summary

Star Bulk Carriers Corp. (SBLK) reported that Chief Strategy Officer Charis Plakantonaki purchased 3,000 common shares on September 15, 2026 at an offering price of €24.50 (about $28.27) per share. The purchase was made in the Parallel Offering in Greece following the company’s dual listing on Euronext Athens, increasing her direct holdings to 58,778 shares. No Rule 10b5-1 trading plan is reported.

Insider Trade Summary

Net Buyer: 3,000 shares

Net Buy 1 txn

Insider Plakantonaki Charis

Role Chief Strategy Officer

Bought 3,000 shs ($85K)

Type	Security	Shares	Price	Value
Purchase	Common shares par value $ 0.01 per share	3,000	$28.27	$85K

Holdings After Transaction: Common shares par value $ 0.01 per share — 58,778 shares (Direct)

Key Figures

Shares purchased: 3,000 shares Offering price (euro): €24.50 per share Equivalent price (USD): $28.27 per share +1 more

4 metrics

Shares purchased 3,000 shares Common shares acquired on September 15, 2026 in the Parallel Offering

Offering price (euro) €24.50 per share Price per share in the Greek Parallel Offering

Equivalent price (USD) $28.27 per share USD equivalent of the €24.50 offering price

Shares owned after transaction 58,778 shares Direct holdings of the Chief Strategy Officer after the purchase

Key Terms

Parallel Offering, dual listing, Rule 10b5-1

3 terms

Parallel Offering financial

"Participation in the Parallel Offering undertaken by STAR BULKCARRIERS CORP in Greece"

dual listing financial

"following its dual listing on Euronext Athens"

A dual listing is when a company makes the same shares available on two different stock exchanges, often in different countries, so investors can buy and sell the same ownership stake in more than one market—like a shop opening branches in two cities that sell the same product. It matters to investors because it can widen the pool of buyers, make shares easier to trade, expose the stock to different currencies and rules, and create price differences or arbitrage opportunities that affect returns and risk.

Rule 10b5-1 regulatory

"No Rule 10b5-1 trading plan is reported"

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did SBLK report for Chief Strategy Officer Charis Plakantonaki?

She purchased 3,000 common shares of Star Bulk Carriers Corp. on September 15, 2026 in the Parallel Offering in Greece at an offering price of €24.50 (about $28.27) per share.

How many SBLK shares does the Chief Strategy Officer hold after this transaction?

After the reported purchase, Chief Strategy Officer Charis Plakantonaki directly holds 58,778 common shares of Star Bulk Carriers Corp., according to the Form 4 data.

At what price were the new SBLK shares acquired in the parallel offering?

The 3,000 Star Bulk Carriers Corp. shares were acquired at an offering price of €24.50 per share, stated as equivalent to $28.27 per share in the Form 4 remarks.

Was the SBLK insider trade made under a Rule 10b5-1 trading plan?

No. The filing indicates that the Rule 10b5-1 checkbox is not selected, and there is no footnote stating that the transactions were made pursuant to a Rule 10b5-1 or other pre-arranged trading plan.

What is the context of this SBLK insider purchase in Greece?

The purchase was part of a Parallel Offering in Greece undertaken by Star Bulk Carriers Corp., following its dual listing on Euronext Athens, as described in the Form 4 remarks.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/17/2026 - 10:40 AM Accepted by SEC EDGAR 09/17/2026 - 10:39 AM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Plakantonaki Charis

(Last) (First) (Middle)

57 PANAGIOTOU ANAGNOSTOPOULOU

(Street)

ATHENS 10672

(City) (State) (Zip)

GREECE

(Country)

2. Issuer Name and Ticker or Trading Symbol
Star Bulk Carriers Corp. [ SBLK ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Strategy Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/15/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common shares par value $ 0.01 per share	09/15/2026		P		3,000	A	$28.27	58,778	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

Participation in the Parallel Offering undertaken by STAR BULKCARRIERS CORP in Greece, following its dual listing on Euronext Athens, pursuant to which subscribed to 3,000 new common shares at the offering price of euro 24.50 per share (or equivalent $28.27).

	Charis Plakantonaki	09/17/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)