AA vs BHP: Which Is the Better Buy in 2026?

Same yardstick, side by side (as of October 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: AA 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 BHP 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 BHP 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 (about 2.5 million metric tons produced in Q3 2026) and Aluminum (about 649,000 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

BHP Group is a global diversified resources company headquartered in Australia and dual-listed, with a US ADR trading on the NYSE under BHP. Its core businesses are Western Australia iron ore (the largest earnings contributor historically and among the lowest-cost in the world), copper (mines including Escondida in Chile plus operations in Australia and the Americas), metallurgical coal, and a growing potash business anchored by the Jansen project in Canada. BHP reports on an Australian fiscal year ending June 30 and reports in US dollars. For FY2026 (the year to June 30, 2026, reported in August), revenue rose about 15% to roughly $58.8 billion and net income was about $9.8 billion, up from about $51.3 billion and $9.0 billion in FY2025.

Full BHP 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; Restarts and higher volumes.
• BHP drivers: Copper as the growth engine; Low-cost iron ore cash engine.

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, and the stock's roughly 23% decline in 2026 despite higher profits shows how fast sentiment can turn. For BHP, bHP's earnings are highly sensitive to iron ore and copper prices, which are driven by Chinese property and steel demand, global growth, and supply from rivals.

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; BHP 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 BHP guides.

AA. Figures are approximate and tied to the asOf date; verify live numbers before acting. For a cyclical producer, a forward P/E under 8x can be a trap because it reflects strong-cycle earnings that consensus already expects to fall about 18% in 2027, so the multiple says more about where aluminum prices sit than about the company. Analyst targets around $60 imply upside from the mid-October price, but that view is a bet on the commodity as much as on Alcoa.

BHP. BHP reports on an Australian fiscal year ending June 30 and reports in US dollars. FY2026 revenue recovered about 15% to roughly $58.8 billion after the prior year's 8% decline, while consensus looks for FY2027 EPS of about $4.68, roughly 10% lower. At about 22 times trailing and 18 times forward earnings, the shares trade above their earlier mid-teens multiple after a 50% one-year rally, and the variable dividend means the yield shifts with the cycle rather than staying fixed.

Headline figures (approximate, October 2026): AA shows revenue (ttm) ~$14.3 billion (Q3 2026 ~$3.70 billion, up ~24% year over year), net income (ttm) ~$1.5 billion (Q3 2026 ~$483 million); net margin ~11%, adjusted eps (q3 2026) ~$1.82 vs ~$1.51 consensus; trailing EPS ~$4.81, operating margin ~16% (gross margin ~23%); BHP shows revenue (fy2026) ~$58.8 billion (up ~15%), net income (fy2026) ~$9.8 billion (~17% margin), ebitda (ttm) ~$30 billion, market capitalization ~$215 billion.

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