AA vs CENX: 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: CENX 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. AA and CENX 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 AA and CENX 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.

Alcoa Corporation is one of the world's largest upstream aluminum companies, running the full chain from bauxite mining to alumina refining to aluminum smelting. It reports in two segments: Alumina (roughly 2.4 million metric tons produced in Q1 2026) and Aluminum (about 607,000 metric tons in the same quarter). Because it sells raw and semi-finished metal into global markets, Alcoa is a price-taker: its revenue and margins are driven mainly by the London Metal Exchange aluminum price and the alumina price index, plus its own energy and raw-material costs. That makes it different from downstream fabricators like Arconic that sell finished, engineered products at steadier margins.

Full AA guide

Century Aluminum smelts primary aluminium and sells it as ingot, billet and other value-added shapes. Its US footprint centres on Sebree in Kentucky and Mt. Holly in South Carolina; Grundartangi in Iceland supplies the European market on low-carbon hydro and geothermal power; a carbon anode plant in the Netherlands feeds the smelters; and a majority stake in Jamalco covers bauxite mining and alumina refining in Jamaica, giving the group partial control of its own raw material. Roughly 2,906 people work across those sites. Chicago is the corporate base, and Glencore, a commodity trading house and long-time commercial partner, holds close to ~30% of the shares.

Full CENX guide

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

• AA drivers: Aluminum price and supply gap; San Ciprian restart and higher volumes.
• CENX drivers: The Midwest premium and Section 232; Restarted capacity arriving into a strong price.

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 dominant risk is commodity price cyclicality: with revenue tied to aluminum and alumina indices, a global slowdown or a swing in Chinese supply can compress earnings quickly, as Q1 2026's weaker alumina pricing already showed. For CENX, aluminium is a commodity and Century's earnings track its price with almost no cushion, which is why the shares carry a beta near ~2.0 and why full-year 2025 net income of ~$41.8M sat alongside trailing net income near ~$600M a year later.

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 AA if you believe its drivers more; CENX 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 AA and CENX guides.

AA. Figures are approximate and tied to the asOf date; verify live numbers before acting. For a cyclical producer, a low forward P/E can be a trap because it reflects peak-cycle earnings that may not repeat if metal prices fall, so earnings multiples on Alcoa mean less than where aluminum prices sit in the cycle. Analyst targets skew bullish on the aluminum supply-gap thesis, but that view is a bet on the commodity as much as on the company.

CENX. Trailing multiples look undemanding at roughly ~8.5x earnings and about ~1.9x sales, and forward estimates screen near ~3x, but a low-single-digit forward multiple on a smelter usually says the market doubts the earnings are durable rather than that the shares are cheap. Second quarter revenue of ~$752M came in under consensus near ~$819M while adjusted EPS of ~$2.46 beat an estimate of ~$2.35, a split that tells you the beat came from price and mix rather than volume. Anything built off a peak Midwest premium is worth re-checking against the premium itself before it is treated as a run rate.

Headline figures (approximate, July 2026): AA shows revenue (ttm) ~$13 billion (Q1 2026 was ~$3.19 billion, down ~5% year over year), net income (q1 2026) ~$425 million attributable to common shareholders, diluted eps (q1 2026) ~$1.60 (adjusted ~$1.40), market cap ~$12.4 billion (stock ~$47 per share); CENX shows revenue (ttm) ~$2.67B, net income (ttm) ~$600M, eps (ttm) ~$5.79 to ~$6.02, market cap ~$5.14B.

AA and CENX 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 AA and CENX exposure against your real portfolio. It is not an investment adviser.