Question 1

How many shares of MPLX does Blackstone Inc. own?

Accepted Answer

As of 2026-Q1, Blackstone Inc. holds 15.4M shares of MPLX (MPLX LP).

Question 2

What is Blackstone Inc.'s MPLX position worth?

Accepted Answer

As of 2026-Q1, Blackstone Inc.'s MPLX position is worth $876.1M.

Question 3

Is Blackstone Inc. buying or selling MPLX?

Accepted Answer

In 2026-Q1, Blackstone Inc. decreased their MPLX position (-2.3% change in shares).

Question 4

When did Blackstone Inc. first buy MPLX?

Accepted Answer

Based on available 13F filings, Blackstone Inc. first reported a position in MPLX in 2024-Q2. They have held the position across 25 quarters.

Quarter	Action	Shares	Change	Value	Weight	Price	Conviction
2026-Q1 Latest	Decreased	15.4M	-2.3%	$876.1M	3.4%	$59.01	0
2025-Q4	Increased	15.7M	+12.0%	$838.2M	3.3%	$52.61	65
2025-Q3	Decreased	14M	-17.3%	$700.2M	2.8%	$48.07	0
2025-Q2	Decreased	16.9M	-3.2%	$872.8M	3.7%	$48.64	0
2025-Q1	Decreased	17.5M	-9.1%	$936.6M	3.9%	$49.95	0
2024-Q4	Decreased	19.2M	-11.8%	$921.1M	4.2%	$43.27	0
2024-Q3	Decreased	21.8M	-5.7%	$970.2M	4.2%	$39.71	0
2024-Q2	Decreased	23.1M	-0.4%	$985.5M	4.1%	$37.09	0