13F Insight
DOSSIER · 13F Holders · Q1 2026BellwetherCompounder

Marathon Petroleum Corp

9 institutions still hold Marathon Petroleum Corp as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 56585a902·9 13F holders·last filed Mar 31, 2026
Market cap
—
▲ 8.6%
vs prior quarter
13F value held
$171M
53.0% inst. owned
of float
Holders
9
-112 QoQ
filers reporting
Activity
+66 / −17
+844 added · −857 reduced
this quarter
Concentration
34.99%
IMC-Chicago, LLC #1
top holder share
AI Holders Summary · Q1 2026

9 institutions reported Marathon Petroleum Corp in Q1 2026. IMC-Chicago, LLC leads at 35.0% of the visible book. -112 net institutions QoQ — distribution reading.

Top holders

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

#HolderValueShares% port.Quarter
01
IMC-Chicago, LLC
CIK 0001452861· Market maker
$60M246K0.02%Q1 202602
Garda Capital Partners LP
CIK 0001666905
$41M167K10.60%Q1 202603
GROUP ONE TRADING LLC
CIK 0000932540
$24M99K0.05%Q1 202604
SIMPLEX TRADING, LLC
CIK 0001488542
$17M68K0.01%Q1 202605
Optiver Holding B.V.
CIK 0001859606· Market maker
$15M60K0.01%Q1 202606
JPMORGAN CHASE & CO
CIK 0000019617
$10M40K0.00%Q1 202607
Maven Securities LTD
CIK 0001633046
$5M22K0.10%Q1 202608
SG Americas Securities, LLC
CIK 0001313360
$3,94878K0.00%Q1 202609
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00—Q2 2025