FLR vs MLM: 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: FLR 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. FLR and MLM 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 FLR and MLM 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.

Fluor Corporation is one of the largest engineering, procurement, and construction (EPC) firms in the world. The company provides design and construction services for large industrial projects across energy, chemicals, mining, infrastructure, government, and increasingly clean energy and advanced manufacturing. Fluor typically operates as the lead EPC contractor on multi-billion-dollar projects, coordinating engineering, equipment procurement, and construction execution.

Full FLR guide

Martin Marietta Materials is the second-largest construction aggregates producer in the United States, behind Vulcan Materials. The aggregates business model is identical to Vulcan: heavy aggregates products with high transport costs create local pricing power within each quarry's service area. Martin Marietta operates hundreds of aggregates facilities across the US with concentration in Texas, Colorado, the Carolinas and other high-growth states, and 2026 added quarries in Virginia, Missouri, Kansas, British Columbia, Minnesota and along the I-70 corridor.

Full MLM guide

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

• FLR drivers: Strategic refocus and risk discipline; NuScale Power and small modular reactors.
• MLM drivers: Federal infrastructure tailwind; Lime and specialty minerals through Lhoist North America.

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: Large EPC projects carry execution risk that has historically been disruptive to earnings, and the roughly $2 billion trailing net loss shows how far reported profit can swing. For MLM, construction cycle volatility.

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 FLR if you believe its drivers more; MLM 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 FLR and MLM guides.

FLR. With a trailing net loss, Fluor trades on forward numbers: about 14x the 2027 consensus EPS of $3.38 and roughly 0.4x sales, with about $3.0 billion of cash against $1.1 billion of debt. The eight covering analysts have a mean target near $62, well above the $47.46 close, but the next print on November 6 (consensus EPS $0.79 on $4.28 billion of revenue) will show whether the 2026 recovery holds.

MLM. Martin Marietta trades at about 32.5x trailing and 23x forward earnings, a premium that has compressed as the shares fell about 21% this year while 2026 earnings are expected to dip about 9% before rebounding about 25% in 2027 with Lhoist included. The 24 covering analysts hold a buy consensus with a mean target near $634, though most have trimmed targets since late September.

Headline figures (approximate, October 2026): FLR shows revenue (ttm) ~$15.5 billion (Q2 2026 up ~9% yoy), operating margin ~3% (thin, typical EPC), net income (ttm) ~-$2 billion (two large loss quarters in late 2025), p/e (trailing / forward) n/a (loss) / ~14x; MLM shows revenue (ttm) ~$6.7 billion; Q2 2026 revenue up 21% year over year to a record ~$1.95 billion, operating margin ~20%, eps (ttm) ~$15.42; forward ~$21.90, p/e ~32.5x trailing, ~23x forward.

FLR and MLM 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 FLR and MLM exposure against your real portfolio. It is not an investment adviser.