FIX vs LGN: Which Is the Better Buy in 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: FIX 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. FIX and LGN 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 FIX and LGN 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.

Comfort Systems USA is one of the largest mechanical, electrical, and plumbing (MEP) construction service providers in the United States. The company provides design, installation, and service of heating, ventilation, air conditioning (HVAC), plumbing, electrical, and piping systems for commercial, industrial, and institutional customers. End markets include data centers, semiconductor fabs, life sciences facilities, healthcare buildings, schools, and various other non-residential construction.

Full FIX guide

Legence Corp (NASDAQ: LGN) designs, installs, and maintains the mechanical, electrical, plumbing (MEP), and energy systems that keep technically demanding buildings running, operating through Engineering & Consulting and Installation & Maintenance segments. More than half its revenue now comes from what it calls high-growth end markets, chiefly data centers and technology plus life sciences and healthcare, where it provides technical cooling and complex process systems. The company went public in September 2025 at $28 per share and remains majority-controlled by Blackstone, which retained roughly 74 percent of voting power after the IPO.

Full LGN guide

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

• FIX drivers: Data center construction; Semiconductor fab buildouts.
• LGN drivers: Data center and AI infrastructure demand; Record backlog and raised guidance.

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: Construction cyclicality. For LGN, growth is heavily tied to the data center capital cycle, so any slowdown in AI or hyperscaler spending would hit backlog and revenue hard.

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 FIX if you believe its drivers more; LGN 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 FIX and LGN guides.

FIX. Comfort Systems trades at a premium to traditional construction contractors, reflecting data center end-market exposure and backlog visibility. The multiple has expanded with the AI data center thesis.

LGN. As of July 2026 Legence trades around $70 per share, roughly two and a half times its $28 September 2025 IPO price, for a market cap near $7.6 billion against trailing revenue of about $3.08 billion. GAAP net income is still thin (near breakeven on a trailing basis), so the market is valuing the company on rapid revenue growth, an expanding adjusted EBITDA margin, and a backlog that has more than doubled year over year. Management raised full-year 2026 guidance to roughly $4.1 billion to $4.3 billion in revenue and $470 million to $490 million in adjusted EBITDA.

Headline figures (approximate, early 2026): FIX shows revenue (ttm) ~$7 billion, operating margin ~11% (improving with mix), net income (ttm) ~$600 million, eps (ttm) ~$17.00; LGN shows share price ~$70, market cap ~$7.6B, revenue (ttm) ~$3.08B, revenue growth (ttm) ~44%.

FIX and LGN 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 FIX and LGN exposure against your real portfolio. It is not an investment adviser.