GGB vs SIM: Which Is the Better Buy in 2026?

Same yardstick, side by side (as of September 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. GGB and SIM 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 GGB and SIM 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.

Gerdau S.A. is Brazil's largest steel producer and one of the biggest long-steel and special-steel makers in the Americas. It operates through three main segments: Brazil, North America (the United States, Canada, and Mexico), and South America (Argentina, Peru, and Uruguay), and it relies heavily on electric-arc mini-mills that recycle scrap into rebar, wire rod, merchant bars, and special steels used in construction, autos, and industry. The company also runs a Gerdau Next division targeting businesses adjacent to steel, and produces some iron ore and flat steel for its own use in Brazil.

Full GGB guide

Grupo Simec, S.A.B. de C.V. is a Mexican steel producer that manufactures, processes, and distributes special bar quality (SBQ) steel and structural steel products, including I-beams, channels, angles, rebar, hot-rolled and cold-finished bars, and wire products used in construction, automotive, and machinery. It operates through three geographic segments, with plants in Mexico (Mexicali, Guadalajara, Tlaxcala, San Luis Potosi), the United States (facilities in Ohio, Indiana, and New York), and Brazil. Simec is a subsidiary of Industrias CH, which holds a controlling stake of roughly 85%, so the US-listed ADR (SIM on NYSE American) represents a relatively small public float and trades with limited liquidity.

Full SIM guide

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

• GGB drivers: North America strength; Capital investment and modernization.
• SIM drivers: Steady operating margins on volume; Fortress balance sheet and cash pile.

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: Steel is deeply cyclical, so revenue and profit can fall sharply when construction and industrial demand slow or when steel prices decline. For SIM, the dominant risk is currency: because Simec holds a large cash balance and reports in pesos, foreign-exchange translation swings can dominate net income, as 2025's ~85% profit drop showed even though operations were stable.

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 GGB if you believe its drivers more; SIM 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 GGB and SIM guides.

GGB. Gerdau trades at cyclical-value multiples, with an EV/EBITDA around 6 and a low double-digit trailing P/E that compresses further on forward estimates. Steel shipments grew about 6% to roughly 11.6 million tonnes in 2025, but weaker Brazil margins pulled adjusted EBITDA down modestly for the year. Reported figures move with steel prices and the real, so trailing metrics can shift quickly across quarters.

SIM. Figures are approximate and tied to the asOf date; verify live numbers before acting. The trailing P/E screens elevated (~24x) largely because 2025 net income was depressed by a one-off foreign-exchange loss, so the multiple overstates how expensive the operating business is; backing out the currency effect and the large cash balance changes the picture materially. For a currency-sensitive steelmaker, where the peso sits matters as much as steel demand for reported results.

Headline figures (approximate, July 2026): GGB shows revenue (ttm) ~$13 billion (roughly R$70 billion for 2025), net income (ttm) ~$560 million, adjusted ebitda (2025) ~R$10.1 billion (down ~7% YoY), market cap ~$8 to 9 billion; SIM shows revenue (fy2025) ~Ps. 30.3 billion (~$1.6 billion), down ~10% year over year, net sales (q1 2026) ~Ps. 8.0 billion, up ~3% year over year, net profit (q1 2026) ~$99 million, up ~31% from ~$76 million in Q1 2025, net profit (fy2025) ~Ps. 1.5 billion, down ~85% mostly on a peso FX swing.

GGB and SIM 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 GGB and SIM exposure against your real portfolio. It is not an investment adviser.