MARINER INVESTMENT GROUP LLC — 13F Holdings & Portfolio

CIK 1096978 · latest 13F-HR filed 2026-07-27

MARINER INVESTMENT GROUP LLC manages $463.1M in 13F-reported U.S. long-equity assets across 124 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are IBIT (22.49%), SPY (12.33%), BABAF (7.65%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 29 new positions and exited 9; 23 existing positions rose in reported value and 10 fell.

AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.

AUM

$463.1M

Long-equity book

Holdings

124

Distinct positions

Period

2026-06-30

Filed 2026-07-27

Q/Q Activity

+29 / −9 / ↑23 / ↓10

vs 2026-03-31

Portfolio charts

Latest quarter's book, what changed, and how the portfolio has evolved across filings.

Portfolio map

Q2 26

IBIT24.4% · 0%SPY13.4% · new BABAF8.3% · +20%FLR7.8% · 0%DASH5.8% · new GPN5.3% · 0%RIVN3.8% · new RITM2.9% · 0%AKAM2.6% · new SHY1.9% · +34%LYV1.4% · 0%CIM1.2% · 0%MUB1.1% · new ETR1.1% · 0%VCSH1.0% · +2%LECO1.0% · +162%WMB1.0% · +22%GLW0.8% · new FOURPA0.8% · new MTZ0.8% · +33%AERO0.7% · 0%FERG0.7% · new EWZ0.6% · new RWT0.6% · 0%FOUR0.6% · -66%IEI0.6% · +169%IEF0.5% · new PMT0.5% · new MFA0.5% · 0%PMT0.5% · 0%HYG0.5% · new RWT0.4% · 0%TOL0.4% · new RKT0.4% · 0%BHF0.4% · new TLT0.4% · new FIX0.3% · new IREN0.3% · new LUMN0.3% · +133%DX0.3% · 0%GEV0.3% · new IGV0.3% · 0%RRC0.3% · 0%EQT0.2% · 0%SABR0.2% · new WMT0.2% · 0%WIX0.2% · +90%KRMN0.2% · +200%Q0.2% · new CORZ0.1% · +25%CIFR0.1% · new ON0.1% · -96%CSCO0.1% · new CCK0.1% · 0%AES0.1% · 0%CRWV0.1% · new FLEX0.1% · new WOLF0.1% · -60%XPRO0.1% · +50%IHRT0.1% · +62%

Box size = position value; colour = change in share count vs the prior quarter (green added, red trimmed, blue new). Rows split across managers or share classes are combined. Click a box for the stock.

Sector mix

% of 13F value

Sectors from each company's SIC code; funds and ETFs grouped separately.

Biggest buys and sells

Q1 26 → Q2 26

Estimated from the change in shares held × the quarter-end price, so price moves alone don't count as buying. New and exited positions are included.

13F assets and positions

3 quarters

Total reported 13F value (bars) and number of positions (line) each quarter. Value changes include market moves.

Top positions over time

reported value

The eight largest current positions, valued at each quarter end.

Concentration

top 10 = 76.2%

Cumulative share of the portfolio held in the largest N positions.

Firm Profile & Key People

Assets Under Management

$149.62B

Discretionary

$149.62B

Employees

146

Accounts

Address

299 PARK AVENUE
5TH FLOOR
NEW YORK, NY 10171

Phone

(914) 670-4300

Website

WWW.MARINERINVESTMENT.COM
www.linkedin.com/company/mariner-investment-group
brightmeadowcapital.com

Name	Title / Status	Ownership	Type
ARLEDGE, CURTIS, YATES Control	CHAIRMAN & CHIEF EXECUTIVE OFFICER	Less than 5%	Individual
ARLEDGE, CURTIS, YATES Control	EQUITY HOLDER	25–50%	Individual
BEIRNE, PATRICK, E Control	CHIEF OPERATING OFFICER	Less than 5%	Individual
HOWE, CHARLES, RAYMOND Control	PRESIDENT & CHIEF FINANCIAL OFFICER	Less than 5%	Individual
Kelty, John Control	CHIEF LEGAL OFFICER	Less than 5%	Individual
MIG HOLDINGS, LLC Control	SOLE OWNER	75% or more	Domestic Entity
O'ROURKE, PETER, JOSEPH Control	GENERAL COUNSEL	Less than 5%	Individual
THOMPSON, RUSSELL, ANTHONY Control	CHIEF COMPLIANCE OFFICER & DEPUTY GENERAL COUNSEL	Less than 5%	Individual

Quarter-over-quarter changes

Changes in reported position value vs the prior 13F, so price moves count too, not just shares bought or sold.

Top Adds (vs prior quarter)

LINCOLN ELEC HLDGS INC$2.7M +179.0%
FLUOR CORP$2.3M +7.4%
ISHARES TR$2.0M +32.7%
ISHARES TR$1.5M +166.5%
MASTEC INC$1.4M +72.4%

Show all 23 →

Top Trims

ISHARES BITCOIN TRUST ETF-$16.1M -13.4%
ON SEMICONDUCTOR CORP-$11.6M -95.1%
SHIFT4 PMTS INC-$3.9M -61.6%
REDWOOD TRUST INC-$478.8K -15.5%
RANGE RES CORP-$239.7K -17.7%

Show all 10 →

New Positions

Show all 29 →

Exited Positions

SNOWFLAKE INC$17.7M
LIVE NATION ENTERTAINMENT IN$7.6M
CATERPILLAR INC$2.7M
SOLSTICE ADVANCED MATLS INC$1.1M
LEGENCE CORP$846.9K

Show all 9 →

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#	Issuer	Symbol	CUSIP	Value	Δ

MARINER INVESTMENT GROUP LLC Holdings (2026-06-30)

Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).

#	Issuer	Symbol	CUSIP	Value	Weight	Shares	Type
1	ISHARES BITCOIN TRUST ETF	IBIT	46438F101	$104.2M	22.49%	3,129,352	SH
2	STATE STR SPDR S&P 500 ETF T	SPY	78462F103	$57.1M	12.33%	76,475	SH
3	ALIBABA GROUP HLDG LTD	BABAF	01609WBG6	$35.4M	7.65%	30,000,000	PRN
4	FLUOR CORP	FLR	343412AJ1	$33.3M	7.19%	25,100,000	PRN
5	DOORDASH INC	DASH	25809KAB1	$24.7M	5.32%	25,000,000	PRN
6	GLOBAL PMTS INC	GPN	37940XAU6	$22.5M	4.86%	25,000,000	PRN
7	INVESCO QQQ TR Call	QQQ	46090E103	$19.5M	4.21%	1,400,000	SH
8	RIVIAN AUTOMOTIVE INC	RIVN	76954AAD5	$16.0M	3.46%	15,000,000	PRN
9	RITHM CAPITAL CORP	RITM	64828T201	$12.5M	2.70%	1,332,583	SH
10	AKAMAI TECHNOLOGIES INC	AKAM	00971TAQ4	$11.0M	2.37%	7,500,000	PRN
11	ISHARES TR	SHY	464287457	$8.3M	1.79%	101,199	SH
12	LIVE NATION ENTERTAINMENT IN	LYV	538034BC2	$6.0M	1.29%	5,000,000	PRN
13	CHIMERA INVT CORP	CIM	16934Q802	$5.1M	1.09%	378,899	SH
14	ISHARES TR	MUB	464288414	$4.9M	1.06%	45,454	SH
15	ENTERGY CORP NEW	ETR	29364G103	$4.6M	0.99%	40,000	SH
16	VANGUARD SCOTTSDALE FDS	VCSH	92206C409	$4.2M	0.91%	53,317	SH
17	LINCOLN ELEC HLDGS INC	LECO	533900106	$4.2M	0.90%	15,705	SH
18	WILLIAMS COS INC	WMB	969457100	$4.1M	0.88%	55,000	SH
19	CORNING INC	GLW	219350105	$3.6M	0.77%	14,000	SH
20	SHIFT4 PMTS INC	FOURPA	82452J307	$3.4M	0.74%	55,000	SH
21	MASTEC INC	MTZ	576323109	$3.3M	0.72%	8,000	SH
22	GRUPO AEROMEXICO SAB DE CV	AERO	40054J109	$3.0M	0.66%	169,280	SH
23	FERGUSON ENTERPRISES INC	FERG	31488V107	$2.8M	0.61%	12,000	SH
24	ISHARES INC	EWZ	464286400	$2.8M	0.60%	80,000	SH
25	REDWOOD TRUST INC	RWT	758075402	$2.6M	0.56%	550,361	SH
26	COHERENT CORP Call	COHR	19247G107	$2.4M	0.53%	36,500	SH
27	SHIFT4 PMTS INC	FOUR	82452J109	$2.4M	0.53%	50,000	SH
28	ISHARES TR	IEI	464288661	$2.4M	0.52%	20,551	SH
29	CIENA CORP Call	CIEN	171779309	$2.1M	0.46%	36,000	SH
30	ISHARES TR	IEF	464287440	$2.1M	0.46%	22,596	SH
31	PENNYMAC CORP	—	70932AAH6	$2.0M	0.44%	2,000,000	PRN
32	MFA FINL INC	MFA	55272X607	$2.0M	0.44%	210,000	SH
33	PENNYMAC MTG INVT TR	PMT	70931T103	$2.0M	0.44%	180,000	SH
34	ISHARES TR	HYG	464288513	$2.0M	0.42%	24,600	SH
35	REDWOOD TRUST INC	RWT	758075AF2	$1.8M	0.39%	1,800,000	PRN
36	TOLL BROTHERS INC	TOL	889478103	$1.6M	0.36%	10,000	SH
37	REDFIN CORP	RKT	75737FAE8	$1.6M	0.34%	1,645,000	PRN
38	BRIGHTHOUSE FINL INC	BHF	10922N103	$1.6M	0.34%	25,000	SH
39	ISHARES TR	TLT	464287432	$1.6M	0.34%	18,080	SH
40	QNITY ELECTRONICS INC Call	Q	74743L100	$1.6M	0.34%	100,000	SH
41	COMFORT SYS USA INC	FIX	199908104	$1.5M	0.32%	750	SH
42	IREN LIMITED	IREN	Q4982L109	$1.4M	0.30%	30,000	SH
43	LUMEN TECHNOLOGIES INC	LUMN	550241103	$1.3M	0.29%	175,000	SH
44	DYNEX CAP INC	DX	26817Q886	$1.2M	0.27%	95,000	SH
45	GE VERNOVA INC	GEV	36828A101	$1.2M	0.25%	1,000	SH
46	ISHARES TR	IGV	464287515	$1.1M	0.24%	12,500	SH
47	RANGE RES CORP	RRC	75281A109	$1.1M	0.24%	30,000	SH
48	ENTEGRIS INC Call	ENTG	29362U104	$1.1M	0.23%	50,000	SH
49	EQT CORP	EQT	26884L109	$1.1M	0.23%	20,000	SH
50	LYONDELLBASELL INDUSTRIES NV Put	LYB	N53745950	$1.0M	0.23%	200,000	SH