MPLX (MPLX) is back in focus after reporting higher adjusted EBITDA in the second quarter of 2026, lifting its 2026 capital spending plan by US$500 million and outlining multi year distribution growth ambitions.

Those earnings and capital spending updates come after a steady run in MPLX’s unit price, with a year to date share price return of 10.06% and a 1 year total shareholder return of 25%, which suggests that momentum has been building rather than fading.

If MPLX’s recent move has you thinking about where else cash generating infrastructure might sit in your portfolio, it could be worth scanning 36 power grid technology and infrastructure stocks for other ideas that fit a similar theme.

Bulls point to MPLX’s rising adjusted EBITDA, higher capital spending and distribution growth plans. Bears worry the recent unit price run has already baked that in. Which side do the current valuation markers support next?

Most Popular Narrative: 2.3% Undervalued

The most followed valuation narrative for MPLX pegs fair value close to its recent $59.29 close, with only a small implied discount. That shifts the focus to what needs to go right in the underlying projects and contracts for that valuation to hold.

The recent acquisition of Northwind Midstream and full ownership of BANGL NGL pipeline, both adjacent and complementary to MPLX's existing Permian infrastructure, are described as drivers of higher throughput, expanded access to dedicated acreage, and additional volumes, supporting both revenue and operating margins over the next several years.

Want to see what sits behind that view on throughput and margins? The narrative leans on steady top line performance, firm profit margins and a richer earnings multiple. The mix of buybacks, volume commitments and contract terms plays a larger role than some investors might expect.

Result: Fair Value of $60.71 (UNDERVALUED)

However, MPLX still faces key risks if Permian-focused growth disappoints or contract renewals on shorter-term processing agreements come through on weaker terms.

Next Steps

With both risks and rewards in play for MPLX, it makes sense to move quickly and test the numbers yourself rather than rely on headlines. You can weigh the balance of concerns and potential upsides by checking the 4 key rewards and 2 important warning signs.

Looking for more investment ideas beyond MPLX?

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.