AMPL vs DDOG: 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: DDOG 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. AMPL 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 AMPL 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.

Amplitude, Inc. sells a cloud platform that shows companies how people use their digital products. A team at a bank, a streaming service or a retailer drops Amplitude's code into its app or website, and the software records events such as sign-ups, clicks and purchases, then turns them into funnels, retention curves and cohort charts. Around that core analytics product it now sells experimentation and feature flags, session replay, guides and surveys, a customer data platform, and a set of AI agents that watch dashboards and flag changes on their own. The company was founded in 2011 by Spenser Skates (still CEO), Curtis Liu and Jeffrey Wang, listed on Nasdaq through a direct listing in 2021, and has ~780 employees and more than 5,200 paying customers.

Full AMPL 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.

• AMPL drivers: Statsig and the experimentation upsell; AI agents and the MCP connection.
• 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: Valuation risk is now the obvious one: the shares moved from ~$5.51 in April to ~$17 in October, so a soft November print or cautious 2027 commentary could reverse part of that quickly, as the 21% one-day drop on May 7, 2026 showed. 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 AMPL 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 AMPL and DDOG guides.

AMPL. Amplitude has no meaningful GAAP earnings, so revenue multiples carry the valuation. Subtracting ~$161 million of cash and securities from a ~$2.15 billion market cap gives an enterprise value of ~$2.0 billion, about ~4.9x the ~$409 million midpoint of 2026 revenue guidance and ~5.3x trailing revenue. That is up from roughly 1.5x to 2x in April, when the stock sat near $6. Non-GAAP EPS guidance of ~$0.06 to $0.08 for 2026 implies a forward multiple above 200x, so the price rests on growth and cash flow, not current earnings.

DDOG. Datadog trades at a premium growth-software multiple, about 22x sales and 84x forward earnings, valued on revenue, free cash flow, and durable expansion rather than GAAP earnings. The 2026 reacceleration and the stock's roughly 86% gain have raised the bar for the November 4 report, where consensus calls for about $1.14 billion of revenue and $0.64 of adjusted EPS.

Headline figures (approximate, October 2026): AMPL shows revenue (ttm) ~$374M, arr (q2 2026) ~$410M (+22%), market cap ~$2.15B, share price ~$17.24; DDOG shows revenue (ttm) ~$3.97 billion, revenue growth (q2 2026, yoy) ~36%, accelerating, q2 2026 adjusted eps $0.65 vs ~$0.58 expected, margins (ttm) Gross ~80%, GAAP operating ~0.7%, net ~4.5%.

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