AMT vs XOM: How American Tower Corporation and Exxon Mobil Compare (2026)

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

Exxon Mobil is one of the world's largest publicly traded integrated oil and gas companies. It makes money across three main segments: Upstream, which finds and produces crude oil and natural gas; Product Solutions, which refines crude into fuels and manufactures petrochemicals and specialty products; and the newer Low Carbon Solutions unit, which is building carbon capture and storage, hydrogen, and lithium businesses. Being integrated means Exxon captures value along the full chain, from the wellhead to the gas pump and the chemical plant, which can smooth results when one part of the business is weak.

Full XOM guide

Both fit overlapping themes, but they are not interchangeable. American Tower Corporation is best understood through its own drivers, and Exxon Mobil through its. 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.
• XOM drivers: Record low-cost production growth; Pioneer integration and cost savings.

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.

XOM. An integrated oil major like Exxon is best read through the commodity cycle rather than a single quarter. Earnings swing with oil and gas prices, so a high-price year can produce far more profit than a low-price year even with similar production. The key is whether free cash flow comfortably funds the dividend and buybacks across the cycle; Exxon's low-cost Permian and Guyana barrels are meant to do exactly that. These stocks typically trade at low-to-moderate P/E multiples because the market discounts the cyclicality and long-term energy-transition uncertainty.

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%); XOM shows revenue (fy2025) ~$335 billion, net income (fy2025) ~$28.8 billion, eps (fy2025, approx) ~$6.70. A cheaper-looking multiple is not automatically the better buy: a richer valuation can be justified by faster growth, and a lower one can reflect real risk. Weigh the multiple against how fast each business is actually compounding.

Both share a theme, but they suit different temperaments. American Tower Corporation's case leans on 5g densification and mid-band upgrades, and Exxon Mobil's on record low-cost production 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 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 XOM, exxon's earnings are highly cyclical because they swing with oil and natural gas prices, which the company does not control and which depend on global supply, demand, and OPEC decisions.

Pick AMT if you believe its drivers more; XOM 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 XOM guides.

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