DOSSIER · 13F Holders · Q2 2026

MARATHON PETE CORP

7 institutions still hold MARATHON PETE CORP as of Q2 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 56585A952·7 13F holders·last filed Jun 30, 2026
Market cap
13F value held
$99M
visible holders
Holders
7
filers reporting
Concentration
58.12%
IMC-Chicago, LLC #1
top holder share
AI Holders Summary · Q2 2026

7 institutions reported MARATHON PETE CORP in Q2 2026. IMC-Chicago, LLC leads at 58.1% of the visible book.

Top holders

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

#HolderValueShares% port.Quarter
01
IMC-Chicago, LLC
CIK 0001452861· Market maker
$58M226K0.01%Q2 2026
02
GROUP ONE TRADING LLC
CIK 0000932540
$16M64K0.02%Q2 2026
03
SIMPLEX TRADING, LLC
CIK 0001488542
$16M63K0.01%Q2 2026
04
Maven Securities LTD
CIK 0001633046
$6M23K0.11%Q2 2026
05
Optiver Holding B.V.
CIK 0001859606· Market maker
$3M13K0.00%Q2 2026
06
SG Americas Securities, LLC
CIK 0001313360
$18K32K0.00%Q1 2026
07
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00Q2 2025