CSCO vs DDOG: How Cisco Systems and Datadog Compare (2026)

Same yardstick, side by side (as of July 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: CSCO 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. CSCO and DDOG 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 CSCO and DDOG 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.

Cisco Systems, founded in 1984 by Stanford University computer scientists and headquartered in San Jose, California, designs, develops, and sells technologies that power, secure, and draw insights from the internet across the Americas, Europe, the Middle East, Africa, and Asia Pacific. The company generates revenue across four main product categories: Networking (switches, routers, wireless, and increasingly AI-optimized silicon and infrastructure), Security (firewall, identity, and endpoint products plus the acquired Splunk platform for observability and threat detection), Collaboration (Webex-based unified communications and video), and Observability (application performance and IT operations monitoring). Services revenue, which includes software subscriptions and technical support, accounts for a material and growing share of the overall mix, giving the company a recurring-revenue cushion alongside its hardware cycles.

Full CSCO guide

Datadog is a cloud-based observability and security platform that helps companies monitor the health, performance, and security of their applications and infrastructure. As businesses moved workloads to the cloud and adopted microservices, the number of systems to watch exploded, and Datadog built a unified platform that brings infrastructure monitoring, application performance monitoring, log management, and more into a single product. Engineers and operations teams use Datadog to see what is happening across their entire technology stack in real time, catch problems before users do, and trace issues to their root cause. The company sells primarily through a subscription, land-and-expand model: customers often start with one product, such as infrastructure monitoring, then adopt additional modules like logs, APM, security, and synthetic testing over time. Datadog has expanded aggressively into cloud security and, more recently, observability for AI and large-language-model applications. It is headquartered in New York City and serves a broad base of enterprise and digital-native customers.

Full DDOG guide

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

• CSCO drivers: AI Networking Demand Surge; Splunk and the Security Platform Story.
• DDOG drivers: Land-and-expand platform; Cloud migration tailwind.

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: Cisco's trailing P/E has expanded materially above its 3- and 5-year historical averages, meaning the stock reflects optimistic assumptions about AI-driven growth that require sustained execution to justify. For DDOG, datadog's consumption-based revenue is sensitive to customers' cloud spending; when companies optimize cloud costs, usage and revenue growth can slow.

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 CSCO if you believe its drivers more; DDOG 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 CSCO and DDOG guides.

CSCO. Cisco's trailing P/E of roughly 40x sits meaningfully above its 3-year average of around 21-22x, reflecting the market's repricing of the stock as an AI infrastructure beneficiary rather than a mature hardware company. The forward P/E of approximately 25x suggests analysts expect earnings growth to close some of that gap, but execution on Splunk integration and security revenue recovery will be key. Gross margin compression, from approximately 65.6% to 63.6% GAAP year over year in the most recent quarter, is a metric worth tracking as product mix and memory costs evolve.

DDOG. Datadog trades at a premium growth-software multiple, valued on revenue, free cash flow, and durable expansion rather than GAAP earnings. The market rewards its high net revenue retention, broad product platform, and AI-observability optionality, but the rich valuation makes the stock sensitive to any slowdown in cloud-driven consumption growth.

Headline figures (approximate, 2026-06-27): CSCO shows revenue (ttm, as of april 2026) ~$60.7 billion, revenue growth (yoy, ttm) ~9%, non-gaap eps (q3 fy2026) $1.06, gaap gross margin (q3 fy2026) ~63.6%; DDOG shows revenue (ttm) ~$3 billion, revenue growth ~20-25%, decelerating from prior years, operating margin (gaap) Low, near breakeven on a GAAP basis, operating margin (non-gaap) ~20%+.

CSCO and DDOG 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 CSCO and DDOG exposure against your real portfolio. It is not an investment adviser.