DASTY vs SIEGY: 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: DASTY 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. DASTY and SIEGY 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 DASTY and SIEGY 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.

Dassault Systemes SE is a Paris-based software company, listed on Euronext Paris (ticker DSY) and available to US investors as the DASTY American Depositary Receipt. It sells the tools manufacturers and life-sciences companies use to design, simulate, build and manage products: CATIA for 3D design in aerospace and automotive, SIMULIA for simulation, DELMIA for manufacturing operations, ENOVIA for product lifecycle management, SOLIDWORKS for small and mid-sized engineering firms, and Medidata, acquired in 2019 for ~$5.8 billion, which runs clinical-trial data for drugmakers. These products increasingly sit on a common cloud platform the company calls 3DEXPERIENCE, which it frames as a "virtual twin" of a product, a factory or even a patient. Revenue in 2025 was ~EUR 6.24 billion (~$7.1 billion), up ~4% in constant currency, with non-IFRS operating margins around 32% and non-IFRS diluted EPS of ~EUR 1.31. Pascal Daloz has been chief executive since 2024, succeeding long-time leader Bernard Charles, who remains chairman.

Full DASTY guide

Siemens AG is one of Europe's largest industrial technology companies, headquartered in Munich. It runs four main businesses: Digital Industries (factory automation hardware such as PLCs and drives, plus industrial software including Xcelerator, Teamcenter, NX and the recently acquired Altair and Dotmatics), Smart Infrastructure (electrical products, grid technology and building systems, a big beneficiary of data center and electrification spending), Mobility (rail vehicles, signaling and rail software), and a roughly 67% stake in Siemens Healthineers, the medical imaging and diagnostics company that Siemens plans to separate. Fiscal years end on September 30, and US investors typically hold the company through the SIEGY sponsored ADR, which trades over the counter in dollars rather than on a US exchange. The company employs roughly 300,000 people, sells in close to 190 countries and generates a large share of revenue outside Germany, with the US and China among its biggest markets.

Full SIEGY guide

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

• DASTY drivers: Subscription and cloud transition; Industrial Innovation and aerospace demand.
• SIEGY drivers: Electrification and data center demand at Smart Infrastructure; Industrial software and the Altair and Dotmatics deals.

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: Revenue growth has slowed to the low-to-mid single digits, and a further guidance cut would likely weigh on a stock that has already de-rated sharply. For SIEGY, siemens is cyclical at the margin: an industrial slowdown, weaker China demand or a pause in data center spending would hit orders and the premium multiple at the same time.

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 DASTY if you believe its drivers more; SIEGY 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 DASTY and SIEGY guides.

DASTY. Figures are approximate and in euros, the company's reporting currency; USD conversions assume roughly 1.15 to 1.17 dollars per euro. Non-IFRS EPS excludes acquisition amortisation and share-based compensation, so IFRS EPS is materially lower (~EUR 0.90 in 2025), and the trailing multiple depends heavily on which basis a data provider uses. Third-quarter 2026 results are expected in late October 2026, with Q3 guidance of ~EUR 1.50B to 1.54B in revenue, and the ArisGlobal deal is excluded from the current outlook.

SIEGY. At a Frankfurt share price around €240, Siemens trades at roughly 21 times the midpoint of its raised fiscal 2026 EPS guidance, a premium to its own history and to many diversified industrials but below pure-play electrification and automation names such as Schneider Electric. The SIEGY ADR represents one-half of an ordinary share, so its dollar price is roughly half the euro share price converted at the current exchange rate. Full fiscal 2026 results are due in mid-November 2026. The quarterly cadence matters for ADR holders: results arrive in November, February, May and August, and the ADR typically reacts in the US session following the morning German release.

Headline figures (approximate, October 2026): DASTY shows revenue (fy2025) ~EUR 6.24B (~$7.1B), +4% cc, 2026 revenue guidance ~EUR 6.30B to 6.42B (+3% to 5% cc), non-ifrs operating margin ~32% (2026 guide 32.2% to 32.6%), non-ifrs diluted eps ~EUR 1.31 (2025); 2026 guide EUR 1.30 to 1.34; SIEGY shows revenue (ttm) ~€81 billion, fiscal q3 2026 orders ~€27.9 billion (book-to-bill ~1.34), order backlog ~€132 billion, fy2026 eps pre-ppa guidance ~€11.20 to €11.50.

DASTY and SIEGY 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 DASTY and SIEGY exposure against your real portfolio. It is not an investment adviser.