Oceanhawk: CSS LLC reports 5.49% passive stake

CSS LLC reports sole voting and dispositive authority over its position, which represents 5.49% of Oceanhawk's Class A ordinary share class.

Rhea-AI Filing Summary

Oceanhawk Acquisition Corp. is the issuer whose Class A ordinary shares CSS LLC reports beneficially owning 1,038,610 shares, or 5.49% of the class. CSS LLC reports sole voting and dispositive power over 1,038,610 shares; its shared voting and dispositive power are each 0. Mitchell R. Bialek is identified as CCO.

Key Figures

Beneficial ownership: 1,038,610 shares Percent of class: 5.49% Sole voting power: 1,038,610 shares +1 more

4 metrics

Beneficial ownership 1,038,610 shares CSS LLC's reported Oceanhawk Class A ordinary share position

Percent of class 5.49% CSS LLC's reported beneficial ownership

Sole voting power 1,038,610 shares CSS LLC's reported voting power

Sole dispositive power 1,038,610 shares CSS LLC's reported dispositive power

Key Terms

beneficially owned, Sole Voting Power, Sole Dispositive Power

3 terms

beneficially owned financial

"Amount beneficially owned: 1,038,610"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

Sole Voting Power financial

"Sole Voting Power 1,038,610.00"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

Sole Dispositive Power financial

"Sole Dispositive Power 1,038,610.00"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

FAQ

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

How many OHAC shares does CSS LLC beneficially own?

CSS LLC reports beneficial ownership of 1,038,610 Oceanhawk Class A ordinary shares, equal to 5.49% of the class. It reports sole voting and dispositive power over 1,038,610 shares, while shared voting and dispositive power are each 0.

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

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Available on EDGAR 10/06/2026 - 04:00 PM Accepted by SEC EDGAR 10/06/2026 - 03:59 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Oceanhawk Acquisition Corp

(Name of Issuer)

Class A Ordinary Share, $0.0001 par value

(Title of Class of Securities)

G6722R107

(CUSIP Number)

06/09/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): G6722R107

1

Names of Reporting Persons

CSS LLC/IL

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

ILLINOIS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 1,038,610.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 1,038,610.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,038,610.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.49 %

12

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Oceanhawk Acquisition Corp
(b)	Address of issuer's principal executive offices: 515 Madison Ave, 8th Floor, New York, NEW YORK 10022
Item 2.
(a)	Name of person filing: CSS LLC/IL
(b)	Address or principal business office or, if none, residence: 1 NORTH WACKER DRIVE SUITE 3075 CHICAGO, Illinois 60606
(c)	Citizenship: CSS LLC/IL - ILLINOIS
(d)	Title of class of securities: Class A Ordinary Share, $0.0001 par value
(e)	CUSIP Number(s): G6722R107
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 1,038,610
(b)	Percent of class: 5.49 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: CSS LLC/IL - 1,038,610
	(ii) Shared power to vote or to direct the vote: CSS LLC/IL - 0
	(iii) Sole power to dispose or to direct the disposition of: CSS LLC/IL - 1,038,610
	(iv) Shared power to dispose or to direct the disposition of: CSS LLC/IL - 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

CSS LLC/IL

Signature:	Mitchell R. Bialek
Name/Title:	CCO
Date:	10/06/2026