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Side-by-side financial comparison of MPLX LP (MPLX) and South Bow Corp (SOBO). Click either name above to swap in a different company.

MarkWest Energy Partners, L.P., a subsidiary of MPLX LP, is a natural gas gathering, processing and transportation company master limited partnership of the United States. In 1988, the company was founded in Denver, Colorado and grew to be Colorado's 13th largest company. In 2015 it was acquired by MPLX, itself a subsidiary of Marathon Petroleum.

Bow, McLachlan and Company was a Scottish marine engineering and shipbuilding company that traded between 1872 and 1932.

8-Quarter Revenue & Profit Trend

Side-by-side quarterly history. Quarters aligned by calendar period so offset fiscal years line up.

Revenue
MPLX
MPLX
SOBO
SOBO
Q4 25
$2.5B
Q3 25
$2.5B
Q2 25
$2.4B
Q1 25
$2.5B
Q4 24
$2.4B
Q3 24
$2.3B
Q2 24
$2.3B
Q1 24
$2.2B
Net Profit
MPLX
MPLX
SOBO
SOBO
Q4 25
$1.2B
Q3 25
$1.6B
Q2 25
$1.1B
Q1 25
$1.1B
Q4 24
$1.1B
Q3 24
$1.0B
Q2 24
$1.2B
Q1 24
$1.0B
Operating Margin
MPLX
MPLX
SOBO
SOBO
Q4 25
60.5%
Q3 25
73.2%
Q2 25
54.9%
Q1 25
55.5%
Q4 24
55.6%
Q3 24
54.4%
Q2 24
62.9%
Q1 24
57.6%
Net Margin
MPLX
MPLX
SOBO
SOBO
Q4 25
49.1%
Q3 25
63.2%
Q2 25
44.9%
Q1 25
46.2%
Q4 24
45.9%
Q3 24
44.6%
Q2 24
52.6%
Q1 24
46.7%

Financial Flow Comparison

Revenue → gross profit → operating profit → net profit for each company.

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