PSX Gains 17.5% in a Month: Can Refining Strength Keep the Run Going?

Phillips 66 PSX shares have gained 17.5% in the past four weeks, extending a rally backed by a sharp improvement in second-quarter results. Refining economics and midstream growth have strengthened the operating picture.

The question is whether those gains leave enough room for further upside. Earnings momentum remains favorable, but valuation, cyclical exposure and a lower 2027 earnings estimate argue for a more measured view.

PSX Rally Follows a Stronger Earnings Backdrop

Second-quarter 2026 adjusted earnings were $9.41 per share, up from $2.38 a year earlier. The figure topped the Zacks Consensus Estimate of $7.68 by 22.5%.

Total revenues and other income rose to $52.04 billion from $33.52 billion and beat the consensus mark by 43.9%. That combination gives investors a materially stronger earnings base than a year ago.

Phillips 66 Refining Margins Add Earnings Leverage

Worldwide realized refining margins climbed to $24.08 per barrel from $11.25 a year earlier, while crude capacity utilization reached 96%. Refining adjusted pre-tax income increased to $3.09 billion from $392 million.

Management expects lower net refinery additions and demand growth to support a tighter supply-demand balance, potentially sustaining stronger margins into 2027. Marathon Petroleum Corp. MPC reported a second-quarter refining and marketing margin of $36.33 per barrel, driven primarily by higher crack spreads. Valero Energy Corporation VLO reported $4.5 billion of refining operating income, versus $1.3 billion a year earlier.

PSX Midstream Growth Supports Cash Flow Resilience

Midstream adjusted EBITDA reached $1.05 billion as natural gas liquids pipeline throughput averaged 943,000 barrels per day and fractionation volumes hit 1.02 million barrels per day. Those results broaden the cash-flow base beyond refining.

Phillips 66 is also advancing Western Gateway, in which it holds a 49.9% interest, along with the 300-million-cubic-feet-per-day Zeus Gas Plant and 100,000-barrel-per-day Coastal Bend fractionator. These projects add future growth avenues across its midstream network.

Image Source: Phillips 66

Phillips 66 Valuation Leaves Less Room for Error

PSX has a forward 12-month price-to-earnings ratio of 10.84 versus 9.57 for the Zacks sub-industry and a five-year median of 10.93. The recent share-price advance therefore leaves less valuation cushion if operating conditions soften.

The Zacks Consensus Estimate calls for 2026 earnings of $23.86 per share and 2027 earnings of $21.42. That decline points to normalization after the sharp 2026 earnings rebound.

Image Source: Zacks Investment Research

PSX Risks Could Interrupt the Momentum

Refining and chemical earnings remain cyclical. Phillips 66 also recorded $839 million of mark-to-market pre-tax losses on short derivative positions in the first quarter, followed by about $450 million of favorable impacts across Refining, Marketing and Specialties and Renewable Fuels in the second quarter.

Renewable Fuels faces policy uncertainty because renewable identification number credit generation from foreign feedstocks could be cut in half after 2027. Total debt fell to $20.6 billion in the second quarter, but it remains above management's $17 billion target.

PSX Signals Favor Quality but Support a Hold

The operating setup remains constructive, but the recent rally, premium valuation and expected earnings normalization limit the margin for disappointment. The risk-reward balance now looks more even than the recent price momentum alone suggests.

PSX currently carries a Zacks Rank #3 (Hold). You can see the complete list of today’s Zacks #1 Rank stocks here.

It also has a VGM Score of A, Growth Score of A, Momentum Score of A and Value Score of B. Those favorable Style Scores highlight strength across growth, momentum and value characteristics, but they are designed to complement rather than override the Zacks Rank, supporting a measured near-term stance.

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This article originally published on Zacks Investment Research (zacks.com).

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