AMZN vs CMCSA: 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: CMCSA 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. AMZN and CMCSA 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 AMZN and CMCSA 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.

Amazon is one of the largest companies in the world, operating across three major business lines. Amazon Web Services (AWS) is the dominant global cloud computing provider, with quarterly sales of $42.2 billion in the June 2026 quarter (an annual run rate of roughly $170 billion) and most of the company's operating income. The North America and International e-commerce segments include the Amazon online marketplace, Prime membership, and third-party seller services. Advertising has grown into the third-largest digital ad business in the world (after Google and Meta), at $19.8 billion in the June 2026 quarter alone.

Full AMZN guide

Comcast is a global media and technology company built on three main pillars. Its Connectivity and Platforms business, anchored by Xfinity, is one of the largest US broadband and cable providers, selling high-speed internet, video, mobile (Xfinity Mobile), and home services to tens of millions of households, plus business connectivity. Its Content and Experiences business includes NBCUniversal, which owns the NBC broadcast network, cable networks (USA, Bravo, MSNBC, CNBC), the Peacock streaming service, Universal Pictures film studio, and Universal theme parks worldwide. Comcast also owns Sky, a major European media and broadband operator. The company makes money primarily from recurring broadband and connectivity subscriptions, which are its most profitable and stable revenue, supplemented by advertising, content licensing, box-office and streaming revenue, and theme-park admissions. Comcast is headquartered in Philadelphia and generates substantial free cash flow that funds dividends and buybacks.

Full CMCSA guide

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

• AMZN drivers: AWS as the AI infrastructure backbone; Retail margin expansion.
• CMCSA drivers: Broadband cash engine; Wireless and convergence.

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: Hyperscaler AI capex is concentrated; if model training demand cools, AWS growth slows. For CMCSA, comcast's core video business is in secular decline as cord-cutting erodes traditional cable-TV subscribers, and broadband subscribers keep shrinking under heavy competition from fiber overbuilders (AT and T, others), fixed-wireless from T-Mobile and Verizon, and newer satellite mobile and internet offers.

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 AMZN if you believe its drivers more; CMCSA 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 AMZN and CMCSA guides.

AMZN. Amazon's trailing P/E fell to about 20x by October 2026, but mostly because one-time gains on its Anthropic stake swelled net income, not because the stock got cheaper; on forward estimates it trades near 24x, still well below the ~40x of early 2026. The valuation premium is paid for AWS and advertising; retail is essentially valued near cost. The open question is whether AWS growth near 37% justifies capex that has pushed free cash flow below zero, and the October 29 report is the next read on that.

CMCSA. At roughly six to seven times earnings and a ~6% yield, Comcast is priced for continued decline in its core broadband business, which shrank its market value to under ~$80 billion in October 2026. The bull case rests on ~$12.7 billion of trailing free cash flow, parks and Peacock growth, and the pricing reset stabilising subscribers; the bear case is that lower ARPU and free lines compress margins faster than retention improves. Third-quarter results on 22 October 2026 (consensus ~$0.99 EPS) are the next read.

Headline figures (approximate, October 2026): AMZN shows revenue (ttm) ~$776 billion (June 2026 quarter up ~20% YoY), operating margin ~13.7% (AWS materially higher; retail much lower), net income (ttm) ~$135 billion (includes large Anthropic investment gains), eps (ttm) ~$12.43; CMCSA shows revenue (ttm) ~$124.9 billion; Q2 2026 ~$29.94 billion, -~1.2% y/y, operating margin ~17% latest; ~14.7% trailing per Trefis, down from ~18.1%, net income (ttm) ~$11.2 billion (~$3.10 EPS), p/e trailing / forward ~7.2x / ~6.2x.

AMZN and CMCSA 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 AMZN and CMCSA exposure against your real portfolio. It is not an investment adviser.