Question 1

How many shares of MPC does Calamos Advisors LLC own?

Accepted Answer

As of 2026-Q2, Calamos Advisors LLC holds 290,934 shares of MPC (MARATHON PETROLEUM CORP).

Question 2

What is Calamos Advisors LLC's MPC position worth?

Accepted Answer

As of 2026-Q2, Calamos Advisors LLC's MPC position is worth $74.4M.

Question 3

Is Calamos Advisors LLC buying or selling MPC?

Accepted Answer

In 2026-Q2, Calamos Advisors LLC decreased their MPC position (-8.8% change in shares).

Question 4

When did Calamos Advisors LLC first buy MPC?

Accepted Answer

Based on available 13F filings, Calamos Advisors LLC first reported a position in MPC in 2024-Q3. They have held the position across 30 quarters.

Quarter	Action	Shares	Change	Value	Weight	Price	Conviction
2026-Q2 Latest	Decreased	290,934	-8.8%	$74.4M	0.2%	$255.67	0
2026-Q1	Increased	319,159	+1.9%	$77.9M	0.3%	$211.98	36
2025-Q4	Decreased	313,204	-6.8%	$50.9M	0.2%	$163.82	0
2025-Q3	Increased	336,206	+0.3%	$64.8M	0.2%	$195.49	35
2025-Q2	Increased	335,232	+21.5%	$55.7M	0.2%	$165.65	42
2025-Q1	Increased	275,994	+0.8%	$40.2M	0.2%	$141.78	35
2024-Q4	Increased	273,786	+0.2%	$38.2M	0.2%	$132.65	35
2024-Q3	Increased	273,160	+13.5%	$44.5M	0.2%	$159.18	40