MARINER INVESTMENT GROUP LLC

CIK

1096978

Location

NEW YORK, NY

Portfolio Value

Mid $1,392,272,455

Diversification

Highly concentrated

Filing Date

Global Rank

#1,466 / 8,604 ▼ 170 · as of Mar 2026

Top Industry

Oil & Gas E&P 11.4%

3Y Alpha vs SPY

-9.8%

Period ended 3 months ago

Filed May 5, 2026 · 2mo

23 quarters · since Mar 2020

Clone Performance

Jul 2023–Jul 2026 · vs SPY

Hypothetical growth of cloning every reported 13F position and rebalancing on each filing, indexed to the same start.

Cloned portfolio

-13.3%

SPY

+76.5%

Annualised alpha

-25.5%

Max drawdown

−59.1%

Estimate. 13F holdings are quarter-lagged and long-only, so the clone rebalances about 45 days after each period end — when the filing becomes public — and excludes options and short positions. Past performance does not predict future results.

Portfolio Concentration

77 positions · as of Mar 31, 2026 · Δ vs Dec 31, 2025

Top Position

64.7%

+55.5 pts

Top 5

78.0%

+44.0 pts

Top 10

83.7%

+24.2 pts

HHI

4,281

Highly concentrated+3,820

Portfolio Trend

23 quarters · across all stocks

Sector Breakdown

As of Mar 31, 2026

Sector	% Portfolio	Value	Positions
Unclassified	75.2%	$1,046,400,603	3
Industrials	4.2%	$58,798,180	13
Technology	3.8%	$52,797,595	11
Consumer Cyclical	3.7%	$51,748,240	9
Energy	3.4%	$47,165,200	8
Basic Materials	2.7%	$37,397,080	5
Utilities	2.2%	$30,692,100	5
Real Estate	1.9%	$26,670,198	9
Financial Services	1.6%	$22,072,405	7
Consumer Defensive	1.1%	$15,636,425	3
Communication Services	0.2%	$2,894,429	4

Last Quarter's Activity

Export CSV

Mar 31, 2026 vs Dec 31, 2025

Added To

Positions the filer increased

17 positions

Ticker	Company	Δ Shares	Shares	Value
SPY	Spdr S&P 500 ETF Trust	+1,260,000	1,385,000	$900,720,900
IBIT	iShares Bitcoin Trust ETF	+982,816	3,129,352	$120,229,703
RITM	Rithm Capital Corp.	+463,872	1,332,583	$12,632,886
FOUR	Shift4 Payments, Inc.	+345,000	470,000	$20,553,100
FSK	FS KKR Capital Corp	+275,000	700,000	$7,126,000
BXSL	Blackstone Secured Lending Fund	+200,000	325,000	$7,699,250
CIM	Chimera Investment Corp	+88,899	378,899	$4,755,182
LEN	Lennar Corp /New/	+65,000	123,500	$10,724,740
TLN	Talen Energy Corp	+55,000	60,000	$19,153,800
COP	Conocophillips	+50,000	100,000	$13,200,000
DHI	Horton D R Inc /De/	+45,500	107,000	$14,682,540
OLN	OLIN Corp	+36,000	236,000	$7,016,280
CARR	CARRIER GLOBAL Corp	+25,000	75,000	$4,223,250
CCK	Crown Holdings, Inc.	+15,000	20,000	$2,005,000
BLDR	Builders FirstSource, Inc.	+15,000	115,000	$9,467,950
LGN	Legence Corp.	+5,000	15,000	$846,900
WOLF	Wolfspeed, Inc.	+5,000	25,000	$408,000
No positions match the current search.

Trimmed

Positions the filer reduced

15 positions

Ticker	Company	Δ Shares	Shares	Value
DOW	Dow Inc.	−345,000	205,000	$8,538,250
LYB	LyondellBasell Industries N.V.	−260,000	240,000	$19,334,400
RWT	Redwood Trust Inc	−194,985	550,361	$3,087,525
GLW	Corning Inc /Ny	−170,000	30,000	$4,079,100
RRC	Range Resources Corp	−146,000	30,000	$1,355,400
MCD	Mcdonalds Corp	−133,000	30,000	$9,323,700
WMB	Williams Companies, Inc.	−100,000	95,000	$6,914,100
UAL	United Airlines Holdings, Inc.	−50,000	25,000	$2,301,750
CAT	Caterpillar Inc	−31,200	8,800	$6,234,448
DAL	Delta Air Lines, Inc.	−25,000	25,000	$1,662,000
CEG	Constellation Energy Corp	−20,000	10,000	$2,792,500
VST	Vistra Corp.	−15,000	25,000	$3,758,250
LECO	Lincoln Electric Holdings Inc	−10,000	6,000	$1,494,480
MTZ	Mastec Inc	−8,500	6,000	$1,930,440
ETR	Entergy Corp /De/	−5,000	40,000	$4,494,400
No positions match the current search.

New Positions

Positions the filer opened this quarter

25 positions

Ticker	Company	Shares	Value
USO	United States Oil Fund, LP	200,000	$25,450,000
PWR	Quanta Services, Inc.	30,000	$16,470,600
DVN	Devon Energy Corp/De	300,000	$15,096,000
COHR	Coherent Corp.	42,500	$10,123,925
APA	APA Corp	200,000	$8,488,000
APH	Amphenol Corp /De/	50,000	$6,317,500
Q	Qnity Electronics, Inc.	50,000	$5,769,000
DE	Deere & Co	10,000	$5,633,000
WING	Wingstop Inc.	33,500	$5,191,495
KHC	Kraft Heinz Co	200,000	$4,498,000
PHM	Pultegroup Inc/Mi/	33,500	$3,939,935
WMT	Walmart Inc.	29,964	$3,723,925
ENTG	Entegris Inc	25,000	$2,931,000
GBDC	GOLUB CAPITAL BDC, Inc.	200,000	$2,532,000
OCSL	Oaktree Specialty Lending Corp	200,000	$2,260,000
PMT	PennyMac Mortgage Investment Trust	180,000	$2,098,800
MFA	Mfa Financial, Inc.	210,000	$2,011,800
PAAS	Pan American Silver Corp	25,000	$1,365,750
DX	Dynex Capital Inc	95,000	$1,212,200
FITB	Fifth Third Bancorp	25,000	$1,161,500
SOLS	Solstice Advanced Materials Inc.	15,000	$1,142,400
JEF	Jefferies Financial Group Inc.	25,000	$1,031,750
MCHP	Microchip Technology Inc	13,000	$839,930
WIX	Wix.com Ltd.	9,000	$810,630
MTSI	MACOM Technology Solutions Holdings, Inc.	3,000	$666,210
No positions match the current search.

Sold Out

Positions the filer fully exited

25 positions

Ticker	Company	Shares	Value
MSFT	Microsoft Corp	344,000	$166,365,280
LRCX	Lam Research Corp	736,000	$125,988,480
COST	Costco Wholesale Corp /New	125,000	$107,792,500
CSCO	Cisco Systems, Inc.	1,372,000	$105,685,160
ASML	Asml Holding NV	93,000	$99,496,980
TXN	Texas Instruments Inc	559,000	$96,980,910
NVDA	Nvidia Corp	497,000	$92,690,500
LIN	Linde PLC	200,000	$85,278,000
INTC	Intel Corp	2,200,000	$81,180,000
HON	Honeywell International Inc	392,000	$76,475,280
AAPL	Apple Inc.	248,000	$67,421,280
MA	Mastercard Inc	100,000	$57,088,000
CTAS	Cintas Corp	269,000	$50,590,830
QQQ	Invesco Qqq Trust, Series 1	50,000	$30,715,500
LOW	Lowes Companies Inc	101,000	$24,357,160
VRT	Vertiv Holdings Co	75,000	$12,150,750
DUK	Duke Energy CORP	76,250	$8,937,262
OKE	Oneok Inc /New/	100,000	$7,350,000
JFR	Nuveen Floating Rate Income Fund	633,488	$4,960,211
CMCSA	Comcast Corp	162,500	$4,552,128
AVGO	Broadcom Inc.	10,000	$3,461,000
HAL	Halliburton Co	100,000	$2,826,000
CRWV	CoreWeave, Inc.	27,000	$1,933,470
FIX	Comfort Systems USA Inc	2,000	$1,866,580
DOCS	Doximity, Inc.	40,000	$1,771,200
No positions match the current search.

Portfolio Positions

Compact Export CSV View 13F filing

77 positions · $1,392,272,455 total · as of Mar 31, 2026

All sectors Basic Materials Communication Services Consumer Cyclical Consumer Defensive Energy Financial Services Industrials Real Estate Technology Utilities

Showing 1–50 of 77 positions by value · page 1 of 2

Ticker	Company	Type	Shares	Δ Shares	Value (USD)	% Δ Value	% of Portfolio
SPY	Spdr S&P 500 ETF Trust	Added	1,385,000	+1,260,000	$900,720,900	+956.7%	64.69%
IBIT	iShares Bitcoin Trust ETF	Added	3,129,352	+982,816	$120,229,703	+12.8%	8.64%
USO	United States Oil Fund, LP	NEW	200,000	NEW	$25,450,000	NEW	1.83%
FOUR	Shift4 Payments, Inc. Technology	Added	470,000	+345,000	$20,553,100	+161.1%	1.48%
LYB	LyondellBasell Industries N.V. Basic Materials	Reduced	240,000	-260,000	$19,334,400	−10.7%	1.39%
TLN	Talen Energy Corp Utilities	Added	60,000	+55,000	$19,153,800	+922.0%	1.38%
PWR	Quanta Services, Inc. Industrials	NEW	30,000	NEW	$16,470,600	NEW	1.18%
DVN	Devon Energy Corp/De Energy	NEW	300,000	NEW	$15,096,000	NEW	1.08%
DHI	Horton D R Inc /De/ Consumer Cyclical	Added	107,000	+45,500	$14,682,540	+65.8%	1.05%
COP	Conocophillips Energy	Added	100,000	+50,000	$13,200,000	+182.0%	0.95%
RITM	Rithm Capital Corp. Real Estate	Added	1,332,583	+463,872	$12,632,886	+33.4%	0.91%
LEN	Lennar Corp /New/ Consumer Cyclical	Added	123,500	+65,000	$10,724,740	+78.3%	0.77%
COHR	Coherent Corp. Technology	NEW	42,500	NEW	$10,123,925	NEW	0.73%
BLDR	Builders FirstSource, Inc. Industrials	Added	115,000	+15,000	$9,467,950	−8.0%	0.68%
MCD	Mcdonalds Corp Consumer Cyclical	Reduced	30,000	-133,000	$9,323,700	−81.3%	0.67%
DOW	Dow Inc. Basic Materials	Reduced	205,000	-345,000	$8,538,250	−33.6%	0.61%
APA	APA Corp Energy	NEW	200,000	NEW	$8,488,000	NEW	0.61%
BXSL	Blackstone Secured Lending Fund Financial Services	Added	325,000	+200,000	$7,699,250	+133.9%	0.55%
POST	Post Holdings, Inc. Consumer Defensive	Held	75,000	0	$7,414,500	−0.2%	0.53%
FSK	FS KKR Capital Corp Financial Services	Added	700,000	+275,000	$7,126,000	+13.2%	0.51%
OLN	OLIN Corp Basic Materials	Added	236,000	+36,000	$7,016,280	+68.4%	0.50%
WMB	Williams Companies, Inc. Energy	Reduced	95,000	-100,000	$6,914,100	−41.0%	0.50%
APH	Amphenol Corp /De/ Technology	NEW	50,000	NEW	$6,317,500	NEW	0.45%
CAT	Caterpillar Inc Industrials	Reduced	8,800	-31,200	$6,234,448	−72.8%	0.45%
Q	Qnity Electronics, Inc. Technology	NEW	50,000	NEW	$5,769,000	NEW	0.41%
HWM	Howmet Aerospace Inc. Industrials	Held	25,000	0	$5,761,500	+12.4%	0.41%
DE	Deere & Co Industrials	NEW	10,000	NEW	$5,633,000	NEW	0.40%
WING	Wingstop Inc. Consumer Cyclical	NEW	33,500	NEW	$5,191,495	NEW	0.37%
CIM	Chimera Investment Corp Real Estate	Added	378,899	+88,899	$4,755,182	+31.9%	0.34%
KHC	Kraft Heinz Co Consumer Defensive	NEW	200,000	NEW	$4,498,000	NEW	0.32%
ETR	Entergy Corp /De/ Utilities	Reduced	40,000	-5,000	$4,494,400	+8.1%	0.32%
CARR	CARRIER GLOBAL Corp Industrials	Added	75,000	+25,000	$4,223,250	+59.9%	0.30%
GLW	Corning Inc /Ny Technology	Reduced	30,000	-170,000	$4,079,100	−76.7%	0.29%
PHM	Pultegroup Inc/Mi/ Consumer Cyclical	NEW	33,500	NEW	$3,939,935	NEW	0.28%
VST	Vistra Corp. Utilities	Reduced	25,000	-15,000	$3,758,250	−41.8%	0.27%
WMT	Walmart Inc. Consumer Defensive	NEW	29,964	NEW	$3,723,925	NEW	0.27%
IP	International Paper Co /New/ Consumer Cyclical	Held	100,000	0	$3,570,000	−9.4%	0.26%
RWT	Redwood Trust Inc Real Estate	Reduced	550,361	-194,985	$3,087,525	−25.1%	0.22%
ENTG	Entegris Inc Technology	NEW	25,000	NEW	$2,931,000	NEW	0.21%
CEG	Constellation Energy Corp Utilities	Reduced	10,000	-20,000	$2,792,500	−73.7%	0.20%
GBDC	GOLUB CAPITAL BDC, Inc. Financial Services	NEW	200,000	NEW	$2,532,000	NEW	0.18%
AERO	Grupo Aeromexico, S.A.B. de C.V. Industrials	Held	169,280	0	$2,371,612	−36.2%	0.17%
UAL	United Airlines Holdings, Inc. Industrials	Reduced	25,000	-50,000	$2,301,750	−72.6%	0.17%
OCSL	Oaktree Specialty Lending Corp Financial Services	NEW	200,000	NEW	$2,260,000	NEW	0.16%
PMT	PennyMac Mortgage Investment Trust Real Estate	NEW	180,000	NEW	$2,098,800	NEW	0.15%
MFA	Mfa Financial, Inc. Real Estate	NEW	210,000	NEW	$2,011,800	NEW	0.14%
CCK	Crown Holdings, Inc. Consumer Cyclical	Added	20,000	+15,000	$2,005,000	+289.4%	0.14%
SW	Smurfit Westrock plc Consumer Cyclical	Held	50,000	0	$1,992,500	+3.1%	0.14%
CCOI	Cogent Communications Holdings, Inc. Communication Services	Held	105,000	0	$1,978,200	−12.6%	0.14%
MTZ	Mastec Inc Industrials	Reduced	6,000	-8,500	$1,930,440	−38.8%	0.14%