KGSPY vs MT: 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.

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. KGSPY and MT 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 KGSPY and MT 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.

Kingspan Group plc makes the outer skin of buildings and, increasingly, the equipment that goes inside data centres. Its biggest business is insulated panels: steel-faced sandwich panels with an insulating core used for warehouses, factories, cold stores and offices. Around that sit insulation boards, roofing and waterproofing, daylighting, ventilation and water products, and the Tate raised-flooring business. In 2025 Kingspan grouped its fastest-growing, data-centre-heavy activities into a unit called Advnsys, which includes airflow management, cooling, containment and daylighting; Kingspan said in September 2025 that Advnsys made up about 18% of group sales. The rest is reported as the Insulated Building Envelopes business.

Full KGSPY guide

ArcelorMittal is a Luxembourg-headquartered, US-listed steel and mining producer that operates across Europe, the Americas, Asia, and Africa, making flat and long steel products for the automotive, construction, packaging, and appliance markets and mining its own iron ore. It is the largest steel producer outside China, and its results are reported through regional segments plus a separately disclosed 'India and JVs' segment (reflecting AMNS India, VAMA, and AMNS Calvert) and a newer capital-light 'Sustainable Solutions' segment. Steel is a commodity, so the company competes largely on cost, scale, product mix, and proximity to customers rather than on pricing power.

Full MT guide

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

• KGSPY drivers: Data centres through Advnsys; The BMC Manufacturing deal.
• MT drivers: Steel cycle and pricing; Strategic growth projects.

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 biggest swing factor is the construction cycle: non-residential building in Europe has fallen about 11% since 2019, Kingspan described the US as subdued outside tech in mid-2026, and a sluggish, weather-hit start to 2026 shows how quickly volumes can soften. For MT, as a commodity cyclical, MT can see revenue and profit fall sharply when steel prices, iron ore, or demand roll over, and its earnings are far less predictable than those of an average large-cap.

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 KGSPY if you believe its drivers more; MT 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 KGSPY and MT guides.

KGSPY. The numbers describe a company growing high single digits overall with a much faster engine inside it. Revenue on a trailing basis is roughly €9.5 billion, and the raised €1.125 billion trading profit target would mean margins move back above 10% for the year, helped by the faster-growing Advnsys mix. Earnings per share grew more slowly (+5% in H1) than trading profit (+10%), reflecting financing costs and currency. Leverage is moderate at about 1.6x EBITDA before BMC, and management expects it to rise to about 1.9x after the deal and then fall. All figures are in euros, so the KGSPY price in dollars also moves with the euro.

MT. FY2025 net income of about $3.15 billion was up sharply from roughly $1.34 billion in 2024, even as EBITDA slipped about 7% to around $6.54 billion, reflecting a soft patch in steel spreads. The forward P/E (around 12x as of mid-2026) sits below the trailing multiple, which is typical for a cyclical priced on expected recovery. Dividend yield was roughly 1% with a proposed base dividend of $0.60 per share.

Headline figures (approximate, October 2026): KGSPY shows revenue (fy2025) ~€9.2B (+7%), revenue (h1 2026) ~€4.86B (+8%), trading profit (h1 2026) ~€487M, 10.0% margin, fy2026 trading profit target ~€1.125B (raised August 2026); MT shows revenue (fy2025) ~$61.3 billion, net income (fy2025) ~$3.15 billion, ebitda (fy2025) ~$6.54 billion, diluted eps (fy2025) ~$4.13.

KGSPY and MT 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 KGSPY and MT exposure against your real portfolio. It is not an investment adviser.