ALTO vs VLO: Which Is the Better Buy in 2026?

Same yardstick, side by side (as of August 2026). Valuation lined up like this is most meaningful for two names in the same corner of the market, which these are. Figures are approximate; verify before investing.

Reading it: ALTO is the cheaper of the two on forward earnings, but cheaper is not the same as better. Pair the valuation with growth (how far the forward P/E sits below the trailing P/E) and risk (beta) before you decide.

The metrics above tell you which is the marginally better business. The bigger risk for most people is not picking the slightly worse stock, it is over-concentrating. ALTO and VLO share themes, so owning both, or adding either to what you already hold, can quietly push a large share of your portfolio into one bet.

This is the part a generic comparison page cannot answer, because it depends on what you own. Connect your brokerage and Walnut shows your real, combined ALTO and VLO exposure, flags overlap with your existing positions, and tells you if adding one would tip you past a concentration you are comfortable with, read-only by default, with your login staying at your broker. Walnut is not an investment adviser.

Alto Ingredients, Inc. produces, distributes, and markets specialty alcohols, renewable fuel, and essential ingredients across the United States. It reports in three segments: Pekin Campus Production (specialty and fuel-grade alcohol and essential ingredients made at its Pekin, Illinois complex), Marketing and Distribution (marketing and selling its products, including third-party volumes, on an aggregated basis), and Western Production (renewable fuel and related co-products from its Western plants, including corn-derived fuel and liquid carbon dioxide). In January 2025 it added a liquid CO2 business through the acquisition of a beverage-grade carbon-dioxide processor, deepening its essential-ingredients and CO2 offtake. The company is the former Pacific Ethanol, rebranded to reflect its push beyond commodity fuel ethanol toward higher-value specialty alcohols and ingredients used in food, beverage, health, and industrial markets.

Full ALTO guide

Valero Energy is the largest independent petroleum refiner in the world, operating 15 refineries across the United States, Canada, and the United Kingdom with a combined throughput capacity of roughly 3.2 million barrels per day. Unlike an integrated major, Valero does not produce much of its own crude oil, so it makes money on the spread between the cost of crude and the price of refined products like gasoline, diesel, and jet fuel (the refining margin, or crack spread). It reports three segments: Refining, which is the core profit engine; Renewable Diesel, run through the Diamond Green Diesel joint venture with Darling Ingredients; and Ethanol, from a network of corn ethanol plants.

Full VLO guide

Both fit overlapping themes, but they are not interchangeable. The useful comparison is which set of drivers and risks you want exposure to.

• ALTO drivers: Clean-fuel tax credits (Section 45Z); Shift toward specialty alcohols and ingredients.
• VLO drivers: Scale in refining and record throughput; Heavy capital returns to shareholders.

A faster-growing, richer-valued name usually swings harder, so it suits a longer horizon and a higher tolerance for volatility; a steadier, more cash-generative business suits a more conservative or income-minded investor. The honest test is which set of risks you could hold through a drawdown: The central risk is that Alto's core renewable-fuel business is a low-margin, cyclical commodity operation whose profitability swings with the spread between corn and energy costs and ethanol prices, a spread the company does not control. For VLO, valero's earnings are highly cyclical and depend on refining crack spreads, which can collapse quickly when product demand weakens or new refining capacity comes online, as shown by the net loss it reported in the first quarter of 2025.

Growth-minded investors who believe the theme has years to run tend to accept the richer multiple for more upside; value-minded investors lean toward the cheaper forward earnings and steadier profile. Pick ALTO if you believe its drivers more; VLO if you believe its. Many investors hold both, but since they share themes, that is a concentrated bet, not diversification. Decide deliberately and check overlap. For the full detail, see the ALTO and VLO guides.

ALTO. Figures are approximate, tied to the asOf date, and should be checked against Alto's latest filings before acting. A large share of recent profitability came from Section 45Z clean-fuel tax credits rather than operating margin, so trailing earnings may overstate the durability of profits if policy or qualification changes. For a cyclical ethanol producer, earnings multiples are noisy because results move with corn, energy, and ethanol spreads, so the mix shift toward specialty products and the level of policy support matter more than any single quarter's number.

VLO. Valero swung from a Q1 2025 net loss to about $1.3 billion of net income in Q1 2026 as refining margins recovered, and full-year 2025 net income was roughly $2.3 billion (about $3.3 billion adjusted). At a share price near $290 and a market cap around $86 billion, the stock trades near 20 times trailing earnings, though refiner multiples are noisy because earnings gyrate with the margin cycle.

Headline figures (approximate, Jul 2026): ALTO shows net income (q1 2026) ~$4.0 million (~$0.05 per share), a roughly $16 million year-over-year improvement; figures approximate, verify live, net income (q4 2025) ~$21.5 million (~$0.28 per share), a large swing from a prior-year loss, clean-fuel credits (45z) ~$3.9 million net in Q1 2026; management guided to ~$15 million net for full-year 2026, segments Three: Pekin Campus Production, Marketing & Distribution, and Western Production; VLO shows revenue (ttm) ~$130 billion, net income (fy2025) ~$2.3 billion ($7.57 EPS), adjusted eps (fy2025) ~$10.61, q1 2026 net income ~$1.3 billion ($4.22 EPS).

ALTO and VLO are related but distinct: same themes, different businesses and risks. Neither wins in the abstract; the right pick is whichever thesis you actually believe, sized so you are not over-concentrated in one theme. Walnut can show your combined ALTO and VLO exposure against your real portfolio. It is not an investment adviser.