KNF vs MLM: How Knife River Corporation and Martin Marietta Materials Compare (2026)

Same yardstick, side by side (as of August 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: KNF 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. KNF 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 KNF 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.

Knife River Corporation was spun out of MDU Resources in May 2023 and now trades as a standalone construction materials company. It owns roughly 1.1 to 1.3 billion tons of permitted aggregate reserves across a network of about 200 active aggregate sites, 135 ready-mix plants, 55 asphalt plants and 9 liquid asphalt terminals in 14 states. Around 35 percent of the aggregates it digs get consumed internally, feeding ready-mix concrete, asphalt, asphalt paving, heavy civil construction and site development. That vertical structure is the whole point of the model: aggregates are heavy and expensive to haul, so a quarry effectively owns the demand inside a 30 to 50 mile radius, and the downstream products capture a second margin on the same ton. The company reports in five segments (Pacific, Northwest, Mountain, Central and Energy Services) and deliberately targets mid-size, higher-growth markets rather than competing head-on for the largest metros.

Full KNF 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 approximately 350 aggregates facilities across the US with concentration in Texas, Colorado, the Carolinas, and other high-growth states.

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.

• KNF drivers: Aggregates pricing and the reserve base; Vertical integration into ready-mix, asphalt and paving.
• MLM drivers: Federal infrastructure tailwind; Texas cement franchise.

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: Contracting services is the weak link: it is lower margin, dependent on project timing, and it was the stated reason the second quarter of 2026 produced a large EPS miss despite double-digit revenue growth. 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 KNF 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 KNF and MLM guides.

KNF. The August 4, 2026 second quarter print is what set the current price: revenue beat but earnings missed by a wide margin, and the shares fell roughly 12 percent to around $70, near the lower half of a 52-week range of about $59 to $96. At that price the stock trades near 28 times trailing earnings and roughly 10 to 11 times enterprise value to EBITDA on 2026 guidance, which is a discount to the multiples large pure-play aggregates producers typically command. The gap reflects the contracting services mix, the leverage, and a trailing free cash flow figure that has been negative while capital goes into reserves and acquisitions.

MLM. Martin Marietta trades at a premium similar to (slightly below) Vulcan, reflecting the same durable aggregates pricing model, the federal infrastructure tailwind, and the Texas cement franchise. The valuation has expanded with the broader infrastructure thesis.

Headline figures (approximate, August 2026): KNF shows revenue (ttm) ~$3.31B, up ~12% year over year, q2 2026 revenue ~$938.6M, up ~13%; EPS ~$0.77 vs ~$1.13 consensus, adjusted ebitda (q2 2026) ~$139.7M, down ~1% year over year, 2026 guidance ~$3.3B to $3.5B revenue, ~$520M to $560M adjusted EBITDA (reaffirmed, trending to upper half); MLM shows revenue (ttm) ~$6.7 billion, operating margin ~22%, net income (ttm) ~$1 billion, eps (ttm) ~$17.00.

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