ATRO vs DCO: 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: ATRO 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. ATRO and DCO 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 ATRO and DCO 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.

Astronics Corporation has been in East Aurora, New York since 1968, and it sells components rather than aircraft. The Aerospace segment, about 93 percent of revenue, supplies electrical power generation and distribution systems, in-seat and cabin power (the EmPower line is on more than a million seats across 260-plus airlines and holds a dominant share of narrowbody in-seat power), lighting and safety systems, seat motion, avionics and aircraft structures. The smaller Test Systems segment builds automated test equipment for defense and mass transit, and its anchor program is the U.S. Army TS-4549/T radio test set, an IDIQ contract initially funded at roughly $215 million that entered full-rate production with a ~$44.7 million order in June 2026. Customers are the airframers, the seat and interior integrators, the in-flight entertainment vendors and government programs, so revenue tracks other people's production schedules more than end-consumer demand.

Full ATRO guide

Ducommun Incorporated is a Santa Ana, California supplier of engineered products and manufacturing services to aerospace and defense customers. It runs two segments. Electronic Systems, the larger one at roughly 58% of second-quarter 2026 revenue, makes circuit card assemblies, wire harnesses and cable, radar and microwave subsystems, and printed circuit boards for missiles, radar, avionics and space hardware. Structural Systems makes metal and composite airframe structures, engine components and titanium parts. The company is one of the oldest continuously operating businesses in California, founded in 1849, and it sits a tier below the primes: it sells to Raytheon, Lockheed Martin, Boeing, Airbus, Northrop Grumman, Spirit AeroSystems and the engine makers rather than to governments or airlines directly. A deliberate shift over the past few years has been toward proprietary engineered products and aftermarket work, which reached about 23% of revenue over the trailing year versus roughly 15% in 2022.

Full DCO guide

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

• ATRO drivers: Aircraft build rates and the retrofit cycle; Margin expansion, not just volume.
• DCO drivers: Missile and defense electronics demand; The commercial narrowbody rate ramp.

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 valuation is the first risk: at roughly 75 times trailing earnings and about 3.7 times TTM revenue, the stock is priced for the margin trajectory to continue, and a single quarter of build-rate softness or program timing slippage tends to hit small-cap suppliers hard. For DCO, program concentration is the structural risk: a handful of platforms (the 737 MAX, the A320, PAC-3, SM-6, the F-15) drive a large share of revenue, and Ducommun does not control the build rates on any of them.

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 ATRO if you believe its drivers more; DCO 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 ATRO and DCO guides.

ATRO. Astronics guided 2026 revenue to $970 million to $1.0 billion, roughly 14 percent growth and entirely organic, with second quarter sales targeted at $245 million to $250 million and results due August 11, 2026. The gap between the ~75 times trailing multiple and the ~32 times forward multiple shows how much of the thesis rests on 2026 and 2027 earnings arriving as guided. Long-term debt sits near $335 million with about $232 million of available liquidity.

DCO. Ducommun is priced like a defense electronics grower rather than a build-to-print machine shop, which is the whole argument of the mix shift. Trailing earnings-based multiples are high (in the 40s range) because GAAP net income is still small against a $3 billion market value, and the bull case rests on that gap closing as the 18% EBITDA target lands and engineered products pass a quarter of sales. Debt of about $276 million against roughly $40 million of cash is not a constraint at current EBITDA, but the valuation assumes the margin plan finishes on schedule.

Headline figures (approximate, August 2026): ATRO shows revenue (ttm) ~$887M, q1 2026 sales ~$231M, up ~12% year over year, gross margin (q1 2026) ~32.6%, up from ~29.5%, net income (ttm) ~$45M, EPS ~$1.03; DCO shows revenue (ttm) ~$865 million, q2 2026 revenue ~$224.5 million, up ~12% year over year, gross margin (q2 2026) ~28.0%, a record, adjusted ebitda margin (q2 2026) ~17.1%, versus the ~18% Vision 2027 target.

ATRO and DCO 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 ATRO and DCO exposure against your real portfolio. It is not an investment adviser.