SEC ownership of Oceanhawk Acquisition Corp.

Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0002090787.

Comparable stake leader

HIGHBRIDGE CAPITAL MANAGEMENT LLC

Disclosed value leader

HIGHBRIDGE CAPITAL MANAGEMENT LLC

Comparable rows

6/31

Latest evidence

30 Sep 2026

Top shareholders Insider holders Latest transactions

Public ticker: OHAC, OHACR, OHACU on Nasdaq
Parsed ownership sources: 13D/G, 13F, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
Largest SEC-reported holder: HIGHBRIDGE CAPITAL MANAGEMENT LLC
Ranking: Comparable ownership first, then disclosed value
Comparable ownership rows: 6 of 31
Meaning: Rows with safely comparable ownership %
Latest 13D/G holder: HIGHBRIDGE CAPITAL MANAGEMENT LLC
Source: Latest parsed Schedule 13D/G stake
Latest parsed ownership date: 30 Sep 2026
Freshness: Most recent filing date in this holder set
Issuer CIK: 0002090787
Issuer location: New York, NY

Ownership snapshot

Top shareholders of Oceanhawk Acquisition Corp. (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Comparable stake leader

HIGHBRIDGE CAPITAL MANAGE...

Disclosed value leader

HIGHBRIDGE CAPITAL MANAGE...

Comparable rows

6/31

Latest evidence

30 Sep 2026

13D/G 13F 3/4/5 Lead comparable stake: 7.9% 25 rows are not safely comparable across share classes. 13D/G row: HIGHBRIDGE CAPITAL MANAGEMENT LLC Showing 1-8 of 31 holder rows.

Quick read

HIGHBRIDGE CAPITAL MANAGEMENT LLC leads the comparable SEC ownership view at 7.9%.

6 of 31 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.

Open SEC evidence Opens HIGHBRIDGE CAPITAL MANAGEMENT LLC's linked filing trail.

Comparable ownership Top 5

HIGHBRIDGE CAPITAL MANAGEMENT LLC 7.9%

Adage Capital Management, L.P. 5.7%

CSS LLC/IL 5.5%

Magnetar Financial LLC 5.2%

Polar Asset Management Partners Inc. 5%

Ownership % is shown only when SEC disclosures are safely comparable across share classes.

Detailed SEC evidence table Showing 1-8 of 31 holder rows

Holder	Evidence	Ownership %	Position	12M Net Δ	As of
HIGHBRIDGE CAPITAL MANAGEMENT LLC	13D/G 13D/G	7.9% Reported 13D/G · 30 Jun 2026	$14,850,000 1,500,000 shares	$0	30 Jun 2026
Adage Capital Management, L.P.	13D/G 13D/G	5.7% Reported 13D/G · 30 Jun 2026	$10,642,500 1,075,000 shares	$0	30 Jun 2026
CSS LLC/IL	13D/G 13D/G	5.5% Reported 13D/G · 09 Jun 2026	$10,344,556 1,038,610 shares	$0	09 Jun 2026
Magnetar Financial LLC	13F 13D/G Company 13F 13D/G	5.2% Reported 13D/G · 30 Jun 2026	$10,080,239 1,972,640 shares mixed-class rows	—	30 Sep 2026
Polar Asset Management Partners Inc.	13D/G 13D/G	5% Reported 13D/G · 30 Jun 2026	$9,405,000 950,000 shares	$0	30 Jun 2026
GOLDMAN SACHS GROUP INC	13D/G THE GOLDMAN SACHS GROUP, INC. 13D/G	2.6% Reported 13D/G · 30 Sep 2026	$4,908,205 491,066 shares	-$9,876,269	30 Sep 2026
Michael Maggard	3/4/5 Director, 10%+ Owner 3/4/5	— mixed-class rows	$3,003,000 6,050,000 shares mixed-class rows	—	20 May 2026
Oceanhawk Acquisition I Sponsor, LLC	3/4/5 10%+ Owner 3/4/5	— mixed-class rows	$3,003,000 6,050,000 shares mixed-class rows	—	20 May 2026

How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

Forms 3/4/5 flow

Insider trading overview

No eligible buy or sell activity is available for this window. No eligible Buy or Sell transactions are available in this dataset since 15 Nov 2025.

Buys

Insiders: 0

Sells

Insiders: 0

Net

Shares: 0

Window

Last 12 months

4 rolling buckets

Buy value Sell value

Shares: 0 Shares: 0

Window (months)	Buy value	Sell value	Net value
0-3	$0	$0	$0
3-6	$0	$0	$0
6-9	$0	$0	$0
9-12	$0	$0	$0

Reporting owners

Insider holders from Forms 3/4/5

Showing 1-9 of 9 reporting-owner rows connected to Oceanhawk Acquisition Corp.. Open a relationship link for the CIK-to-CIK filing trail.

Rows

Largest Forms 3/4/5 holder

Oceanhawk Acquisition I Sponsor, LLC

Net 12M change

Latest report

17 Aug 2026

Name	Relationship	Holdings Value	Valuation	Report Date
Oceanhawk Acquisition I Sponsor, LLC	10%+ Owner	$3,003,000	Mixed	20 May 2026
Michael Maggard	Director, 10%+ Owner	$3,003,000	Mixed	20 May 2026
Jon Ryan	CFO & President, Director		Mixed	17 Aug 2026
Jonathan Nickell	Director		Mixed	17 Aug 2026
Joseph Durnford	Director		Mixed	17 Aug 2026
Ernest Miller	Chief Executive Officer, Director		Mixed	17 Aug 2026
Daniel Collingridge-Padbury	Director		Mixed	17 Aug 2026
Jimmy D. Ford	Director		Mixed	17 Aug 2026
Ernest B. Miller	Chief Executive Officer, Director		Mixed	20 May 2026

Recent insider transactions for Oceanhawk Acquisition Corp.

Showing up to 300 recent insider transactions from the last 12 months.

Insider	Symbol	Class	Transaction	Shares	Shares owned	Date	Ownership
Jon Ryan	OHAC	Class B Ordinary Shares	Other	75,000	75,000	17 Aug 2026	By Oceanhawk Acquisition I Sponsor
Daniel Collingridge-Padbury	OHAC	Class B Ordinary Shares	Other	50,000	50,000	17 Aug 2026	By Oceanhawk Acquisition I Sponsor, LLC
Joseph Durnford	OHAC	Class B Ordinary Shares	Other	50,000	50,000	17 Aug 2026	By Oceanhawk Acquisition I Sponsor, LLC
Jonathan Nickell	OHAC	Class B Ordinary Shares	Other	50,000	50,000	17 Aug 2026	By Oceanhawk Acquisition I Sponsor, LLC
Ernest Miller	OHAC	Class B Ordinary Shares	Other	100,000	100,000	17 Aug 2026	By Oceanhawk Acquisition I Sponsor, LLC

^* marks a reported price that did not pass the local price check.