CWST vs WM: 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: WM 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. CWST and WM 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 CWST and WM 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.

Casella Waste Systems, Inc. collects, transfers, recycles and disposes of solid waste across the eastern United States, with operations concentrated in Vermont, New Hampshire, Maine, New York, Massachusetts, Connecticut and, since a run of mid-Atlantic deals, Pennsylvania and neighboring states. The business is vertically integrated: residential and commercial collection routes feed company transfer stations, which feed company landfills, so a ton picked up on a Casella truck can earn a hauling fee and a disposal fee. Alongside the three geographic segments the company runs Resource Solutions, which handles recycling processing, organics and national accounts for large multi-site customers.

Full CWST guide

Waste Management, Inc. (branded WM) is the largest environmental-services company in North America, providing waste collection, transfer, disposal, and recycling to millions of residential, commercial, industrial, and municipal customers. Its core solid-waste business runs collection routes that feed transfer stations and, ultimately, the industry's most extensive network of landfills. That landfill network is the heart of WM's moat: permitting new landfills is extremely difficult, so owning disposal capacity lets WM capture value across the whole chain and price essential services steadily. WM is also the largest recycler in North America and a leader in turning landfill gas into energy.

Full WM guide

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

• CWST drivers: Northeast disposal scarcity; The tuck-in acquisition machine.
• WM drivers: Pricing power and recurring revenue; Sustainability, RNG, and recycling growth.

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 most obvious risk is that reported earnings are close to zero: trailing net income of ~$5.7 million against a ~$5.76 billion market cap produces a trailing P/E in the four figures, and full-year 2026 net income guidance was trimmed to ~$0-$6 million even as revenue guidance rose. For WM, wM is defensive but not risk-free.

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 CWST if you believe its drivers more; WM 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 CWST and WM guides.

CWST. Casella cannot be valued on reported earnings: trailing net income of ~$5.7 million puts the trailing P/E above 1,000x, an artifact of depreciation and interest from the acquisition program rather than a statement about the business. The forward P/E of roughly 73x and an enterprise value near ~$7 billion against ~$473M-$483M of guided adjusted EBITDA (very roughly 15x) are the more usable anchors. Beta sits near 0.74 and the company pays no dividend, so returns depend entirely on the compounding of acquired and internalized tonnage.

WM. These characteristics are qualitative and tied to the asOf date; verify live figures before acting. WM usually commands a premium multiple because investors pay up for defensive, recurring cash flows, an irreplaceable landfill moat, and a long record of dividend growth. That premium is a double-edged sword: it reflects quality, but it also means the stock can fall harder on any earnings miss or integration setback, and it leaves less margin of safety than a cheaper cyclical would.

Headline figures (approximate, August 2026): CWST shows revenue (ttm) ~$1.96B (+13.6%), q2 2026 revenue ~$543.7M (+16.9% YoY), q2 2026 adjusted ebitda ~$123.2M (+12.5% YoY), fy2026 revenue guidance ~$2.09B-$2.11B; WM shows revenue trend Large-cap scale with steady, mostly single-digit growth, now boosted by the added Stericycle/Healthcare Solutions revenue, profitability Consistently profitable with strong, relatively stable operating margins for an industrial, reflecting pricing power and route density, cash flow Robust and dependable free cash flow that funds capital spending, the dividend, and buybacks, dividend profile A reliable, growing dividend with more than 20 consecutive years of increases; a modest yield prioritizing growth over a high current payout.

CWST and WM 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 CWST and WM exposure against your real portfolio. It is not an investment adviser.