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Side-by-side financial comparison of MPLX LP (MPLX) and WESTLAKE CORP (WLK). Click either name above to swap in a different company.
WESTLAKE CORP is the larger business by last-quarter revenue ($2.5B vs $2.5B, roughly 1.0× MPLX LP). MPLX LP runs the higher net margin — 49.1% vs -21.5%, a 70.6% gap on every dollar of revenue. On growth, MPLX LP posted the faster year-over-year revenue change (1.4% vs -10.9%). MPLX LP produced more free cash flow last quarter ($782.0M vs $-16.0M). Over the past eight quarters, MPLX LP's revenue compounded faster (6.2% CAGR vs -7.7%).
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.
Westlake Corporation is an international manufacturer and supplier of petrochemicals, polymers and fabricated building products, which are fundamental to various consumer and industrial markets. The company was founded by Ting Tsung Chao in 1986. it is the largest producer of low-density polyethylene (LDPE) in the US and ranks among the Forbes Global 2000. Westlake Chemical operates in two segments: Olefins and Vinyls, and is also an integrated producer of vinyls, with substantial downstream ...
MPLX vs WLK — Head-to-Head
Income Statement — Q4 FY2025 vs Q4 FY2025
| Metric | | |
|---|---|---|
| Revenue | $2.5B | $2.5B |
| Net Profit | $1.2B | $-544.0M |
| Gross Margin | — | 3.4% |
| Operating Margin | 60.5% | -26.5% |
| Net Margin | 49.1% | -21.5% |
| Revenue YoY | 1.4% | -10.9% |
| Net Profit YoY | 8.5% | -7871.4% |
| EPS (diluted) | — | $-4.22 |
Green = leading value per metric. Periods may differ when fiscal calendars don't align.
8-Quarter Revenue & Profit Trend
Side-by-side quarterly history. Quarters aligned by calendar period so offset fiscal years line up.
| Q4 25 | $2.5B | $2.5B | ||
| Q3 25 | $2.5B | $2.8B | ||
| Q2 25 | $2.4B | $3.0B | ||
| Q1 25 | $2.5B | $2.8B | ||
| Q4 24 | $2.4B | $2.8B | ||
| Q3 24 | $2.3B | $3.1B | ||
| Q2 24 | $2.3B | $3.2B | ||
| Q1 24 | $2.2B | $3.0B |
| Q4 25 | $1.2B | $-544.0M | ||
| Q3 25 | $1.6B | $-782.0M | ||
| Q2 25 | $1.1B | $-142.0M | ||
| Q1 25 | $1.1B | $-40.0M | ||
| Q4 24 | $1.1B | $7.0M | ||
| Q3 24 | $1.0B | $108.0M | ||
| Q2 24 | $1.2B | $313.0M | ||
| Q1 24 | $1.0B | $174.0M |
| Q4 25 | — | 3.4% | ||
| Q3 25 | — | 8.3% | ||
| Q2 25 | — | 8.7% | ||
| Q1 25 | — | 8.2% | ||
| Q4 24 | — | 11.5% | ||
| Q3 24 | — | 16.0% | ||
| Q2 24 | — | 20.7% | ||
| Q1 24 | — | 15.7% |
| Q4 25 | 60.5% | -26.5% | ||
| Q3 25 | 73.2% | -27.0% | ||
| Q2 25 | 54.9% | -3.7% | ||
| Q1 25 | 55.5% | -1.1% | ||
| Q4 24 | 55.6% | 2.3% | ||
| Q3 24 | 54.4% | 5.8% | ||
| Q2 24 | 62.9% | 12.7% | ||
| Q1 24 | 57.6% | 7.5% |
| Q4 25 | 49.1% | -21.5% | ||
| Q3 25 | 63.2% | -27.6% | ||
| Q2 25 | 44.9% | -4.8% | ||
| Q1 25 | 46.2% | -1.4% | ||
| Q4 24 | 45.9% | 0.2% | ||
| Q3 24 | 44.6% | 3.5% | ||
| Q2 24 | 52.6% | 9.8% | ||
| Q1 24 | 46.7% | 5.8% |
| Q4 25 | — | $-4.22 | ||
| Q3 25 | — | $-6.06 | ||
| Q2 25 | — | $-1.11 | ||
| Q1 25 | — | $-0.31 | ||
| Q4 24 | — | $0.07 | ||
| Q3 24 | — | $0.83 | ||
| Q2 24 | — | $2.40 | ||
| Q1 24 | — | $1.34 |
Balance Sheet & Financial Strength
Snapshot of each company's liquidity, leverage and book value from the latest quarter.
| Metric | | |
|---|---|---|
| Cash + ST InvestmentsLiquidity on hand | $2.1B | $2.7B |
| Total DebtLower is stronger | $24.2B | $5.6B |
| Stockholders' EquityBook value | — | $8.8B |
| Total Assets | $43.0B | $20.0B |
| Debt / EquityLower = less leverage | — | 0.64× |
8-quarter trend — quarters aligned by calendar period.
| Q4 25 | $2.1B | $2.7B | ||
| Q3 25 | $1.8B | $1.9B | ||
| Q2 25 | $1.4B | $2.1B | ||
| Q1 25 | $2.5B | $2.3B | ||
| Q4 24 | $1.5B | $2.9B | ||
| Q3 24 | $2.4B | $2.9B | ||
| Q2 24 | $2.5B | $3.0B | ||
| Q1 24 | $385.0M | $3.1B |
| Q4 25 | $24.2B | $5.6B | ||
| Q3 25 | $24.1B | $4.7B | ||
| Q2 25 | $19.7B | $4.7B | ||
| Q1 25 | $19.7B | $4.6B | ||
| Q4 24 | $19.3B | $4.6B | ||
| Q3 24 | $19.3B | $4.6B | ||
| Q2 24 | $19.2B | $4.9B | ||
| Q1 24 | $18.8B | $4.9B |
| Q4 25 | — | $8.8B | ||
| Q3 25 | — | $9.4B | ||
| Q2 25 | — | $10.3B | ||
| Q1 25 | — | $10.4B | ||
| Q4 24 | — | $10.5B | ||
| Q3 24 | — | $10.7B | ||
| Q2 24 | — | $10.6B | ||
| Q1 24 | — | $10.3B |
| Q4 25 | $43.0B | $20.0B | ||
| Q3 25 | $43.2B | $19.8B | ||
| Q2 25 | $37.8B | $20.8B | ||
| Q1 25 | $39.0B | $20.7B | ||
| Q4 24 | $37.5B | $20.8B | ||
| Q3 24 | $38.5B | $21.1B | ||
| Q2 24 | $38.4B | $21.1B | ||
| Q1 24 | $36.5B | $21.0B |
| Q4 25 | — | 0.64× | ||
| Q3 25 | — | 0.49× | ||
| Q2 25 | — | 0.45× | ||
| Q1 25 | — | 0.44× | ||
| Q4 24 | — | 0.43× | ||
| Q3 24 | — | 0.43× | ||
| Q2 24 | — | 0.46× | ||
| Q1 24 | — | 0.47× |
Cash Flow & Capital Efficiency
How much cash each business actually produces after reinvestment. Cash flow is harder to manipulate than net income.
| Metric | | |
|---|---|---|
| Operating Cash FlowLast quarter | $1.5B | $225.0M |
| Free Cash FlowOCF − Capex | $782.0M | $-16.0M |
| FCF MarginFCF / Revenue | 31.9% | -0.6% |
| Capex IntensityCapex / Revenue | 29.1% | 9.5% |
| Cash ConversionOCF / Net Profit | 1.24× | — |
| TTM Free Cash FlowTrailing 4 quarters | $4.1B | $-530.0M |
8-quarter trend — quarters aligned by calendar period.
| Q4 25 | $1.5B | $225.0M | ||
| Q3 25 | $1.4B | $182.0M | ||
| Q2 25 | $1.7B | $135.0M | ||
| Q1 25 | $1.2B | $-77.0M | ||
| Q4 24 | $1.7B | $434.0M | ||
| Q3 24 | $1.4B | $474.0M | ||
| Q2 24 | $1.6B | $237.0M | ||
| Q1 24 | $1.3B | $169.0M |
| Q4 25 | $782.0M | $-16.0M | ||
| Q3 25 | $905.0M | $-57.0M | ||
| Q2 25 | $1.4B | $-132.0M | ||
| Q1 25 | $979.0M | $-325.0M | ||
| Q4 24 | $1.4B | $149.0M | ||
| Q3 24 | $1.1B | $254.0M | ||
| Q2 24 | $1.4B | $6.0M | ||
| Q1 24 | $1.0B | $-103.0M |
| Q4 25 | 31.9% | -0.6% | ||
| Q3 25 | 36.8% | -2.0% | ||
| Q2 25 | 60.9% | -4.5% | ||
| Q1 25 | 39.8% | -11.4% | ||
| Q4 24 | 56.6% | 5.2% | ||
| Q3 24 | 48.4% | 8.1% | ||
| Q2 24 | 60.0% | 0.2% | ||
| Q1 24 | 47.7% | -3.5% |
| Q4 25 | 29.1% | 9.5% | ||
| Q3 25 | 21.4% | 8.4% | ||
| Q2 25 | 12.8% | 9.0% | ||
| Q1 25 | 10.9% | 8.7% | ||
| Q4 24 | 12.7% | 10.0% | ||
| Q3 24 | 11.9% | 7.1% | ||
| Q2 24 | 9.4% | 7.2% | ||
| Q1 24 | 11.7% | 9.1% |
| Q4 25 | 1.24× | — | ||
| Q3 25 | 0.92× | — | ||
| Q2 25 | 1.64× | — | ||
| Q1 25 | 1.10× | — | ||
| Q4 24 | 1.51× | 62.00× | ||
| Q3 24 | 1.35× | 4.39× | ||
| Q2 24 | 1.32× | 0.76× | ||
| Q1 24 | 1.27× | 0.97× |
Financial Flow Comparison
Revenue → gross profit → operating profit → net profit for each company.
Revenue Breakdown by Segment
MPLX
| Services | $746.0M | 30% |
| Other | $675.0M | 28% |
| Products | $492.0M | 20% |
| Nonrelated Party | $186.0M | 8% |
| Related Party | $151.0M | 6% |
| Crude Oil And Products Logistics | $104.0M | 4% |
| Service Other | $56.0M | 2% |
| Natural Gas And NGL Services | $41.0M | 2% |
WLK
| Performance Materials | $930.0M | 37% |
| Housing Products | $767.0M | 30% |
| Essential Materials | $702.0M | 28% |
| Infrastructure Products | $134.0M | 5% |
