ATI vs PKX: 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: PKX 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. ATI and PKX 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 ATI and PKX 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.

ATI Inc. (ATI), formerly Allegheny Technologies, is a specialty materials and components producer focused on high-performance metals for demanding applications. Its core markets are aerospace and defense, where ATI supplies titanium, nickel-based superalloys, and other advanced alloys used in jet engines, airframes, and defense systems that must withstand extreme heat, stress, and corrosion. The company also serves medical, energy, electronics, and specialty industrial markets. ATI operates through two segments: High Performance Materials and Components (jet engine parts, forgings, and advanced alloys) and Advanced Alloys and Solutions (specialty rolled products and materials). The company has deliberately repositioned over the past several years away from lower-margin commodity stainless toward higher-value, harder-to-make aerospace and defense materials where it has technical differentiation and long qualification cycles that lock in customer relationships. Founded through the combination of specialty metals businesses and headquartered in Dallas, Texas, ATI is a cyclical industrial materials company whose results are tied closely to commercial aerospace production rates and defense spending.

Full ATI guide

POSCO Holdings Inc. (NYSE: PKX) is the holding company for South Korea's POSCO group, historically the country's dominant integrated steel producer and one of the largest and most cost-competitive steelmakers in the world, ranking around eighth globally by crude-steel output at roughly 38 million tonnes a year. The group is organized around a core steel business (POSCO), trading and infrastructure (POSCO International), engineering and construction (POSCO E&C), and a fast-growing green-materials and energy arm focused on lithium, cathode and anode materials, and other battery inputs. Steel still generates the bulk of revenue and profit, but management has repositioned POSCO Holdings as a two-engine company combining a mature, high-quality steel franchise with a rechargeable-battery-materials build-out aimed at the electric-vehicle supply chain.

Full PKX guide

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

• ATI drivers: Commercial aerospace recovery and ramp; Mix shift to high-value materials.
• PKX drivers: Core steel franchise and cost discipline; Lithium and battery-materials build-out.

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: ATI is cyclical and concentrated in aerospace, so any slowdown in commercial aircraft production (for example, Boeing supply-chain or quality problems, or an air-travel downturn) hits demand directly. For PKX, pKX earnings are highly cyclical and swing with global steel prices, which remain pressured by Chinese overcapacity, weak construction demand, and trade barriers and tariffs across key export markets.

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 ATI if you believe its drivers more; PKX 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 ATI and PKX guides.

ATI. ATI's multiple has expanded with the aerospace cycle: ~55x trailing GAAP earnings and ~29x forward, with analysts expecting EPS of ~$5.12 for 2026 and ~$6.37 for 2027. Nine analysts carry a mean target of ~$249, but the stock has drifted ~5% lower over three months from its high. The October 29 Q3 report (consensus ~$1.37 EPS on ~$1.32 billion revenue) tests whether margins keep expanding with the raised guidance.

PKX. With 2026 earnings recovering, the trailing P/E on the ADR has come down to about 18x, and on 2027 estimates it is under 10x; EV/EBITDA is about 3.9x. The 52-week range of about $48.50 to $92.40 shows how sharply sentiment moves with steel and lithium prices, and at $55.65 the ADR sits near the lower end. Investors typically frame PKX on cyclical earnings power and asset value plus optionality on lithium and cathode contracts, not on a single trailing multiple.

Headline figures (approximate, October 2026): ATI shows market cap ~$25.5B (share price ~$187.26 on Oct 16, 2026), revenue (ttm) ~$4.72B, Q2 2026 up ~10.6%, margins (ttm) Gross ~23.7%, operating ~18.2%, net ~10.1%, net income (ttm) ~$476M, EPS ~$3.41; PKX shows revenue (ttm) ~KRW 71 trillion (~9.7% growth in latest quarter), net income (ttm) ~KRW 1.35 trillion, q2 2026 net profit ~KRW 680 billion (Q1: ~KRW 470 billion), p/e (adr) ~17.7x trailing, ~9.7x forward.

ATI and PKX 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 ATI and PKX exposure against your real portfolio. It is not an investment adviser.