$MPC

$470.64 +$13.42 (2.94%) Close

$MPC Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 280.8M shares outstanding

Who owns MPC?

By type of holder

Institutions 77.9% Insiders 0.3% Everyone else 21.9%

Concentration Top 10 holders own 39.6%

BlackRock, Inc. 9.3% · Vanguard Capital Management LLC 6.8%

Institutional ownership

77.9%

-0.8 pts vs last qtr

Institutional holders

1,930

+46 vs last qtr

Net shares bought

−2.2M

by institutions in Q2 2026

New / sold out

176 / 130

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Norges Bank NEW +2.5M
BlackRock, Inc. +1.6M

Biggest sellers in Q2 2026

Harris Associates L P −2.6M
Wellington Management Group LLP −2.4M

Who is planning to sell?

Notices of proposed sale, last 12 months

$37.9M

13 notices from 4 people

Shares covered

172.1K

0.06% of the company

Arranged in advance

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Hennigan Michael J Former director $32.8M
Henschen Michael A II Officer $2.77M

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2016–FY2025

−42.3%

−5.92% a year

Each share's claim on the business

+73.2%

grew without buying or selling a share

Spent on buybacks vs paid in stock

$48.6B vs $1.23B

over 10 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years87% 3–5 years3% 1–3 years6% Under 1 year4%

Quarterly turnover

6.9%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting MPC on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	26.0M	9.26%	+1.6M (+6.6%)	≤2021	0.1%
Shares held by quarter Peak holding26.0M (Q2'26) Change over 8 quarters+639.8K Share of the company9.260% BlackRock, Inc.'s full portfolio →
VC Vanguard Capital Management LLC	19.1M	6.79%	−95.8K (−0.5%)	≤2021	0.1%
Shares held by quarter Peak holding19.2M (Q1'26) Change over 8 quarters+19.1M Share of the company6.790% Vanguard Capital Management LLC's full portfolio →

BlackRock, Inc.

26.0M

% of company

9.26%

Change vs last qtr

+1.6M (+6.6%)

Held since

≤2021

Vanguard Capital Management LLC

19.1M

% of company

6.79%

Change vs last qtr

−95.8K (−0.5%)

Held since

≤2021

28 more super investors behind a free account

See every manager holding Marathon Petroleum Corporation, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting MPC on Form N-PORT; together they hold 35.4% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$2.37B	9.3M	3.30%	0.10%	June 30, 2026
V5 Vanguard 500 Index Fund Vanguard Index Funds	$1.93B	7.6M	2.69%	0.12%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$2.37B

% of company

3.30%

% of the fund

0.10%

As of

June 30, 2026

Vanguard 500 Index Fund

Vanguard Index Funds

Position value

$1.93B

% of company

2.69%

% of the fund

0.12%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Marathon Petroleum Corporation and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
HM Hennigan Michael J Insider	220.9K	0.08%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.080% Hennigan Michael J's insider activity →
SM Seaman Maryann T. Insider	110.9K	0.04%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.040% Seaman Maryann T.'s insider activity →

Hennigan Michael J

Insider

220.9K

% of company

0.08%

Change vs last qtr

—

Held since

—

Seaman Maryann T.

Insider

110.9K

% of company

0.04%

Change vs last qtr

—

Held since

—

22 more holders behind a free account

See every insider and 5%+ holder of Marathon Petroleum Corporation.

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