AMT vs SBAC: Which Is the Better Buy in 2026?

Same yardstick, side by side (as of September 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.

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. AMT and SBAC 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 AMT and SBAC 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.

American Tower Corporation (NYSE: AMT), founded in 1995 and headquartered in Boston, is a real estate investment trust that owns, operates, and develops multitenant communications real estate. Its core business is leasing vertical space on wireless towers to mobile network operators, government agencies, and broadcasters under long-term contracts with annual escalators, generating 97% of 2025 revenue from property operations. Beyond towers, AMT owns CoreSite, a portfolio of 30 U.S. data centers offering colocation and interconnection services to enterprises, cloud providers, and network operators, which has become a fast-growing second revenue engine. The company manages nearly 150,000 communications sites across the Americas, Europe, Africa, and Asia-Pacific, providing global scale that smaller peers cannot easily replicate.

Full AMT guide

SBA Communications (SBAC) is one of the largest independent owners and operators of wireless communications infrastructure, structured as a real estate investment trust (REIT). It owns and leases cell towers, and also rooftops, distributed antenna systems, and small cells, across a portfolio of more than 46,000 communications sites in the Americas and Africa. Its business model is simple and rent-like: SBA owns the vertical steel, and wireless carriers such as the major mobile operators pay long-term leases to hang their antennas on it. The economics improve every time a second or third tenant is added to an existing tower, because the incremental cost is low and most of that new rent falls to the bottom line. Demand is driven by rising mobile data usage, network densification, and the multi-year rollout of 5G, all of which push carriers to add equipment and lease more space. As a REIT, SBA distributes much of its taxable income as dividends and is measured primarily on funds from operations (FFO) and adjusted funds from operations (AFFO) rather than standard earnings per share. Because towers are long-lived assets financed largely with debt, SBA is also sensitive to interest rates, which affect both its borrowing costs and how investors value its steady, contractual cash flows. Headquartered in Boca Raton, Florida, SBA is widely viewed as a way to invest in the long-term growth of mobile data through the landlord of the wireless network.

Full SBAC guide

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

• AMT drivers: 5G Densification and Mid-Band Upgrades; CoreSite and AI-Driven Data Center Demand.
• SBAC drivers: Mobile data growth and 5G densification; High-margin tower economics and lease escalators.

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 immediate risk is customer concentration: in 2025, four carriers (T-Mobile at 18%, AT&T at 17%, Verizon at 14%, and Telefonica at 10%) collectively represented roughly 59% of total revenue, so any material lease dispute, consolidation event, or technology shift (such as carriers building private networks or relying on low-earth-orbit satellites) could disproportionately hurt results. For SBAC, sBA is capital intensive and carries substantial debt to finance long-lived tower assets, which makes it sensitive to interest rates: higher rates raise its borrowing costs and can pressure how investors value its steady cash flows.

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 AMT if you believe its drivers more; SBAC 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 AMT and SBAC guides.

AMT. AMT's trailing P/E of approximately 27x is well below its own 3-year average of roughly 45x and its 10-year average of roughly 56x, reflecting both earnings normalization after a period of large one-time items and a broader re-rating of rate-sensitive REITs in a higher-for-longer interest rate environment. For tower REITs, investors typically focus on AFFO per share rather than GAAP earnings, because the latter is heavily influenced by depreciation and one-time currency gains or losses. On that basis, FY 2025 delivered high-single-digit AFFO per share growth, and management's 2026 guidance projects continued quarterly revenue in the $2.67 billion to $2.77 billion range per quarter, suggesting mid-single-digit full-year growth if realized.

SBAC. As a REIT, SBA is best judged on funds from operations (FFO) and adjusted funds from operations (AFFO) rather than standard earnings per share, because large non-cash depreciation on its towers makes reported net income understate cash generation. A conventional P/E can therefore look high even when AFFO growth is healthy, so the stock often trades on AFFO-per-share growth, leasing trends, and interest-rate expectations. Its debt load means rate moves matter for both costs and valuation. Figures are approximate and dated; verify current numbers before relying on them.

Headline figures (approximate, 2026-06-27): AMT shows revenue (q1 2026) ~$2.74 billion, revenue (fy 2024, most recent full year) ~$10.13 billion, adjusted ebitda (q1 2026) ~$1.84 billion (margin ~67%), affo per share (q1 2026) ~$2.84 (up ~3.3% year-over-year); SBAC shows business model cell-tower REIT leasing wireless infrastructure to carriers, portfolio more than 46,000 communications sites in the Americas and Africa, key metric AFFO per share (REITs are measured on FFO/AFFO, not EPS), affo per share (q4 2025) ~$3.19.

AMT and SBAC 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 AMT and SBAC exposure against your real portfolio. It is not an investment adviser.