Institutional HoldersBeta

Who holds a company, from every 13F filed for the quarter, one row per filer exactly as filed, against the latest share count the company reported.

Blue Water Acquisition Corp. IV

CIK 0002082847BWIVBWIV-UNBWIV-WT· quarter ending 2026-06-30

Shares outstanding

17,758,334

as of 2026-08-14 · 10-Q cover page, filed 2026-08-14

Held by 13F filers

4,497,831

selection includes debt or preferreds — no % of shares outstanding

Holders

+30 vs 2026-03-31 · 30 new, 0 exited

Value

$1.5M

shares +— vs prior quarter

Share classes (cover page of the 10-Q filed 2026-08-14, as of 2026-08-14)

Class	Listed	Shares outstanding	Held by 13F filers	% of class	Holders	CUSIP
Common Class A	BWIV · NYSE	13,425,000	9,950,040	74.1%	35	G1368A104
Common Class B	not listed	4,333,334	—	—

Each class is compared with its own share count; classes are not added together. A class that is not exchange-listed cannot be held by 13F filers.

Securities (CUSIPs held in 13F this quarter)

tick to combine

CUSIP	Class (as filers write it)	Holders	Shares held	Class shares	% of class	Value	Options	Mapped via
G1368A104	ORD SHS CL A	35	9,950,040	13,425,000	74.1%	$98.5M	—	13DG	holders →
G1368A120	UNIT 99/99/9999not common	13	2,551,352	—	—	$25.6M	—	13DG	holders →
G1368A112	*W EXP 08/09/203not common	30	4,497,831	—	—	$1.5M	1 call / 0 put	prefix	holders →

Totals combine the ticked CUSIPs and update as you tick: common-stock classes by default; preferreds, notes, warrants and depositary shares are listed but not counted. "holders →" shows a single CUSIP on its own. Bonds are held as a principal amount, not shares. Options positions are never counted as holdings.

Top holders (30 of 30 · G1368A112)

change vs 2026-03-31

#	Filer	Shares / principal	% of class	Value	Change
1	ADAGE CAPITAL PARTNERS GP, L.L.C.	562,500	—	$191K	NEW
2	Magnetar Financial LLC	475,000	—	$170K	NEW
3	Wealthspring Capital LLC	327,393	—	$111K	NEW
4	Linden Advisors LP	312,500	—	$112K	NEW
5	Alberta Investment Management Corp	300,000	—	$102K	NEW
6	RIVERNORTH CAPITAL MANAGEMENT, LLC	250,000	—	$75K	NEW
7	HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND	250,000	—	$85K	NEW
8	Verition Fund Management LLC	212,479	—	$72K	NEW
9	COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS	200,000	—	$72K	NEW
10	WHITEBOX ADVISORS LLC	175,000	—	$60K	NEW
11	SONA ASSET MANAGEMENT (US) LLC	175,000	—	$60K	NEW
12	TENOR CAPITAL MANAGEMENT Co., L.P.	150,000	—	$51K	NEW
13	BNP PARIBAS FINANCIAL MARKETS	149,986	—	$54K	NEW
14	AQR Arbitrage LLC	146,661	—	$50K	NEW
15	Radcliffe Capital Management, L.P.	137,549	—	$49K	NEW
16	K2 PRINCIPAL FUND, L.P.	100,000	—	$34K	NEW
17	MOORE CAPITAL MANAGEMENT, LP	100,000	—	$34K	NEW
18	Shaolin Capital Management LLC	95,599	—	$33K	NEW
19	BERKLEY W R CORP	57,500	—	$21K	NEW
20	DELTEC ASSET MANAGEMENT LLC	50,000	—	$17K	NEW
21	Mint Tower Capital Management B.V.	50,000	—	$17K	NEW
22	Saba Capital Management, L.P.	49,999	—	$18K	NEW
23	Periscope Capital Inc.	49,900	—	$18K	NEW
24	GLAZER CAPITAL, LLC	32,168	—	$12K	NEW
25	HEIGHTS CAPITAL MANAGEMENT, INC	28,128	—	$10K	NEW
26	DLD Asset Management, LP	25,000	—	$9K	NEW
27	Clear Street Group Inc.	21,510	—	$7K	NEW
28	Hudson Bay Capital Management LP	11,859	—	$4K	NEW
29	Arax Advisory Partners	2,000	—	$680	NEW
30	TORONTO DOMINION BANK	100	—	$34	NEW

Large holders from 13D/13G (latest per reporting person, last 2 years)

Filed when a holder crosses 5% or changes materially, so often more current than the quarter-end 13F. Percentages are the filer's own, against the share count they used.

Reporting person	Form	Filed	Event	Shares	% of class
Adage Capital Management, L.P.	SCHEDULE 13G	2026-05-13	2026-03-31	1,125,000	8.38%
DAVID J. SNYDERMAN	SCHEDULE 13G	2026-05-13	2026-03-31	950,000	7.07%
MAGNETAR CAPITAL PARTNERS LP	SCHEDULE 13G	2026-05-13	2026-03-31	950,000	7.07%
MAGNETAR FINANCIAL LLC	SCHEDULE 13G	2026-05-13	2026-03-31	950,000	7.07%
Phillip Gross	SCHEDULE 13G	2026-05-13	2026-03-31	1,125,000	8.38%
Robert Atchinson	SCHEDULE 13G	2026-05-13	2026-03-31	1,125,000	8.38%
SUPERNOVA MANAGEMENT LLC	SCHEDULE 13G	2026-05-13	2026-03-31	950,000	7.07%
Blue Water Acquisition IV LLC	SCHEDULE 13G	2026-04-15	2026-03-19	5,066,667	27.8%
Joseph Hernandez	SCHEDULE 13G	2026-04-15	2026-03-19	5,066,667	27.8%
Matthew Simpson	SCHEDULE 13G	2026-04-09	2026-03-31	675,757	5.2%
Wealthspring Capital LLC	SCHEDULE 13G	2026-04-09	2026-03-31	675,757	5.2%

Source: SEC Form 13F-HR information tables for the quarter ending 2026-06-30 (filed within 45 days of quarter end; amendments applied; values normalised to dollars), the share count from the company's latest 10-K/10-Q XBRL cover page, and Schedule 13D/13G filings. Each row is a legal 13F filer as filed — related entities (e.g. Vanguard's advisers) are not merged. Retail brokerage accounts are not reported on 13F, so the remainder is mostly retail and insiders.