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

9,950,040

74.1% of Common Class A

Holders

+35 vs 2026-03-31 · 35 new, 0 exited

Value

$98.5M

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 (35 of 35 · G1368A104)

change vs 2026-03-31

#	Filer	Shares	% of class	Value	Change
1	ADAGE CAPITAL PARTNERS GP, L.L.C.	1,125,000	8.38%	$11.1M	NEW
2	Magnetar Financial LLC	950,000	7.08%	$9.4M	NEW
3	Wealthspring Capital LLC	636,319	4.74%	$6.3M	NEW
4	Linden Advisors LP	625,000	4.66%	$6.2M	NEW
5	Alberta Investment Management Corp	600,000	4.47%	$5.9M	NEW
6	HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND	500,000	3.72%	$5.0M	NEW
7	RIVERNORTH CAPITAL MANAGEMENT, LLC	500,000	3.72%	$5.0M	NEW
8	MILLENNIUM MANAGEMENT LLC	475,000	3.54%	$4.7M	NEW
9	COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS	400,000	2.98%	$4.0M	NEW
10	SONA ASSET MANAGEMENT (US) LLC	350,000	2.61%	$3.5M	NEW
11	WHITEBOX ADVISORS LLC	350,000	2.61%	$3.5M	NEW
12	TENOR CAPITAL MANAGEMENT Co., L.P.	300,000	2.23%	$3.0M	NEW
13	BNP PARIBAS FINANCIAL MARKETS	299,972	2.23%	$3.0M	NEW
14	AQR Arbitrage LLC	293,324	2.18%	$2.9M	NEW
15	Radcliffe Capital Management, L.P.	275,100	2.05%	$2.7M	NEW
16	Kryger Capital LLC	245,791	1.83%	$2.5M	NEW
17	TWO SIGMA INVESTMENTS, LP	226,562	1.69%	$2.2M	NEW
18	Verition Fund Management LLC	217,884	1.62%	$2.2M	NEW
19	MOORE CAPITAL MANAGEMENT, LP	200,000	1.49%	$2.0M	NEW
20	GLAZER CAPITAL, LLC	199,309	1.48%	$2.0M	NEW
21	WOLVERINE ASSET MANAGEMENT LLC	190,125	1.42%	$1.9M	NEW
22	Clear Street Group Inc.	173,251	1.29%	$1.7M	NEW
23	BERKLEY W R CORP	149,160	1.11%	$1.5M	NEW
24	Mint Tower Capital Management B.V.	100,000	0.74%	$990K	NEW
25	DELTEC ASSET MANAGEMENT LLC	100,000	0.74%	$990K	NEW
26	K2 PRINCIPAL FUND, L.P.	100,000	0.74%	$990K	NEW
27	Periscope Capital Inc.	99,800	0.74%	$988K	NEW
28	Shaolin Capital Management LLC	90,725	0.68%	$898K	NEW
29	HEIGHTS CAPITAL MANAGEMENT, INC	60,000	0.45%	$594K	NEW
30	DLD Asset Management, LP	50,000	0.37%	$495K	NEW
31	Hudson Bay Capital Management LP	23,718	0.18%	$235K	NEW
32	ABC ARBITRAGE SA	20,000	0.15%	$198K	NEW
33	TrueMark Investments, LLC	10,000	0.07%	$99K	NEW
34	DV Trading LLC	10,000	0.07%	$99K	NEW
35	Arax Advisory Partners	4,000	0.03%	$40K	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.