ATI vs PKX: How ATI Inc. and PKX Compare (2026)

Same yardstick, side by side (as of July 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 trades as a cyclical aerospace and defense materials supplier, with its multiple expanding when commercial aircraft build rates and defense demand are strong. The repositioning toward higher-value alloys has improved margins and earnings quality, but the valuation still reflects sensitivity to the aerospace cycle and raw-material and capacity-ramp risks rather than steady-state stability.

PKX. PKX trades on a TTM P/E that looks high (roughly 28-34x) mainly because 2025 earnings were depressed by the steel-cycle trough and battery-materials impairments, so trailing multiples overstate the underlying valuation. The stock's 52-week range (roughly $45 to $92) reflects how sharply sentiment shifts with steel and lithium prices. Investors typically frame PKX on cyclical earnings power and asset value plus optionality on lithium, not on a single trailing multiple.

Headline figures (approximate, early 2026): ATI shows revenue (ttm) ~$4.5 billion, operating margin ~low-double-digit percent (improving with mix), net income (ttm) ~$350-450 million, p/e (ttm) ~20-25x (cyclical); PKX shows revenue (fy2025) ~KRW 69 trillion (~$50 billion), net income (fy2025) ~KRW 0.5 trillion (down ~47%), q1 2026 operating profit ~KRW 710 billion (beat forecasts), market capitalization ~$16-18 billion.

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.