Question 1

Does Calamos Advisors own MPC stock?

Accepted Answer

Yes. As of its Q3 2026 13F, Calamos Advisors holds 270,083 shares of MPC (Marathon Petroleum), worth $106.8M.

Question 2

How many shares of MPC does Calamos Advisors own?

Accepted Answer

As of its Q3 2026 13F, Calamos Advisors holds 270,083 shares of MPC (Marathon Petroleum).

Question 3

What is Calamos Advisors' MPC position worth?

Accepted Answer

As of its Q3 2026 13F, Calamos Advisors' MPC position is worth $106.8M.

Question 4

Is Calamos Advisors buying or selling MPC?

Accepted Answer

In Q3 2026, Calamos Advisors reduced its MPC position by 20,851 shares (-7.2%).

Question 5

When did Calamos Advisors first buy MPC?

Accepted Answer

Calamos Advisors already held MPC in its Q1 2019 13F, the earliest on record, and has listed it in 31 quarterly 13F filings.

Quarter	Action	Shares	Change	Value	Weight	Price	Conviction
2026-Q3 Latest	Decreased	270,083	-7.2%	$106.8M	0.3%	$395.42	0
2026-Q2	Decreased	290,934	-8.8%	$74.4M	0.2%	$254.97	0
2026-Q1	Increased	319,159	+1.9%	$77.9M	0.3%	$242.59	36
2025-Q4	Decreased	313,204	-6.8%	$50.9M	0.2%	$160.76	0
2025-Q3	Increased	336,206	+0.3%	$64.8M	0.2%	$189.57	35
2025-Q2	Increased	335,232	+21.5%	$55.7M	0.2%	$162.48	42
2025-Q1	Increased	275,994	+0.8%	$40.2M	0.2%	$141.70	35
2024-Q4	Increased	273,786	+0.2%	$38.2M	0.2%	$134.90	35
2024-Q3	Increased	273,160	+13.5%	$44.5M	0.2%	$156.64	40