13F Insight
DOSSIER · 13F Holders · Q1 2026Most-boughtAI cap-ex
MARA 0 06/01/31

MARA HOLDINGS INC NOTE 6/0

29 institutions still hold MARA HOLDINGS INC NOTE 6/0 as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 565788AH9·29 13F holders·last filed Mar 31, 2026
Market cap
—
▲ 1.9%
vs prior quarter
13F value held
$262M
45.0% inst. owned
of float
Holders
29
-56 QoQ
filers reporting
Activity
+66 / −40
+904 added · −826 reduced
this quarter
Concentration
18.18%
WHITEBOX ADVISORS LLC #1
top holder share
AI Holders Summary · Q1 2026

29 institutions reported MARA 0 06/01/31 in Q1 2026. WHITEBOX ADVISORS LLC leads at 18.2% of the visible book. -56 net institutions QoQ — distribution reading.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
WHITEBOX ADVISORS LLC
CIK 0001257391
$48M52.0M0.59%Q1 202602
ARISTEIA CAPITAL, L.L.C.
CIK 0001080171
$44M47.7M0.91%Q1 202603
AMERIPRISE FINANCIAL INC
CIK 0000820027
$24M26.4M0.01%Q1 202604
STATE STREET CORP
CIK 0000093751
$18M19.2M0.00%Q1 202605
Long Corridor Asset Management Ltd
CIK 0001845501
$15M16.0M3.58%Q1 202606
BlackRock, Inc.
CIK 0002012383
$14M15.3M0.00%Q1 202607
Context Capital Management, LLC
CIK 0001301396
$13M14.3M0.30%Q1 202608
MORGAN STANLEY
CIK 0000895421
$13M13.8M0.00%Q1 202609
MARSHALL WACE, LLP
CIK 0001318757
$13M15.0M0.01%Q4 202510
DSC Meridian Capital LP
CIK 0001970572
$11M11.5M3.26%Q1 202611
FMR LLC
CIK 0000315066
$9M10.3M0.00%Q1 202612
CAPSTONE INVESTMENT ADVISORS, LLC
CIK 0001426196
$9M10.0M0.02%Q1 202613
K2 PRINCIPAL FUND, L.P.
CIK 0001461790
$8M9K0.58%Q1 202614
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
$5M5.4M0.00%Q1 202615
Parallax Volatility Advisers, L.P.
CIK 0001521001
$5M5.0M0.01%Q1 202616
CITIGROUP INC
CIK 0000831001
$5M5.2M0.00%Q1 202617
BANK OF AMERICA CORP /DE/
CIK 0000070858
$3M3.0M0.00%Q1 202618
STATE OF WISCONSIN INVESTMENT BOARD
CIK 0000854157
$3M3.0M0.01%Q1 202619
Sculptor Capital LP
CIK 0001054587
$2M2.5M0.02%Q1 202620
JANE STREET GROUP, LLC
CIK 0001595888· Market maker
$2M2.0M0.00%Q1 2026
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