American Tower (REIT) (AMT) vs Iron Mountain (Delaware)Common Stock REIT (IRM)
Head-to-head comparison of performance, valuation, growth, profitability and dividends. Prices delayed 15 minutes; data as of Oct 8, 2026.
Summary
Iron Mountain (Delaware)Common Stock REIT (IRM) has outperformed American Tower (REIT) (AMT) over the past year, gaining 7.2% versus a loss of 10.2%. Over five years, IRM leads with a +151.7% price change compared with -38.1% for AMT. American Tower (REIT) is the larger company by market cap ($77.69 billion vs $33.63 billion), about 2.3 times the size, while Iron Mountain (Delaware)Common Stock REIT is growing revenue faster (+12.2% vs +5.1%).
On valuation, American Tower (REIT) trades at a lower forward P/E (23.8x vs 41.4x for Iron Mountain (Delaware)Common Stock REIT). American Tower (REIT) offers the higher dividend yield (4.19% vs 2.99%). American Tower (REIT) converts more of its revenue into profit, with a net margin of 24.7% versus 2.2%.
Summary generated from market data by MetaCap's automated system. Methodology
Relative performance
Percent change in share price from the first common trading day shown; excludes dividends.
Head-to-head
| Metric | AMT | IRM |
|---|---|---|
| Share price | $166.73 | $112.97 |
| Market cap | $77.69B | $33.63B |
| 1-day change | +0.33% | -2.40% |
| YTD return | -5.04% | +36.19% |
| 1-year return | -10.16% | +7.19% |
| 5-year return | -38.09% | +151.72% |
| P/E ratio (TTM) | 22.93 | 80.69 |
| Forward P/E | 23.78 | 41.43 |
| EPS (TTM) | $7.27 | $1.40 |
| Dividend yield | 4.19% | 2.99% |
| Annual dividend | $6.98 | $3.38 |
| Revenue (latest FY) | $10.64B | $6.90B |
| Revenue growth (YoY) | +5.11% | +12.23% |
| Net income (latest FY) | $2.63B | $152.25M |
| Gross margin | — | 55.38% |
| Operating margin | 45.52% | 16.86% |
| Net margin | 24.69% | 2.21% |
| 52-week high | $196.08 | $134.68 |
| 52-week low | $160.06 | $77.77 |
| Distance from 52-week high | -14.97% | -16.12% |
| Analyst consensus | buy | buy |
| Avg. price target upside | +29.39% | +28.43% |
| Average volume | 2.60M | 1.73M |
| Shares outstanding | 465.96M | 297.70M |
| Employees | 4,866 | 29,400 |
| Sector | Real Estate | Real Estate |
| Industry | Real Estate Investment Trusts | Real Estate Investment Trusts |
Highlighted cells mark the higher value for growth, returns, margins and yield, and the lower value for P/E ratios. Highlighting is a mechanical comparison, not a recommendation.
Key differences
- American Tower (REIT) is about 2.3 times larger than Iron Mountain (Delaware)Common Stock REIT by market value ($77.69B vs $33.63B).
- IRM has outperformed AMT by 17.4 percentage points over the past year.
- Iron Mountain (Delaware)Common Stock REIT trades at a higher earnings multiple (80.7x vs 22.9x trailing P/E).
- American Tower (REIT) offers a meaningfully higher dividend yield (4.19% vs 2.99%).
- American Tower (REIT) is more profitable, keeping 24.7 cents of every revenue dollar as net income versus 2.2 cents for Iron Mountain (Delaware)Common Stock REIT.
- Iron Mountain (Delaware)Common Stock REIT grew revenue faster in its latest fiscal year (+12.23% vs +5.11%).
About American Tower (REIT)
AMT stock →American Tower Corporation one of the largest global REITs, is a leading independent owner, operator and developer of multitenant communications real estate with a portfolio of over 148,000 communications sites and a highly interconnected footprint of U.S. data center facilities.
Real Estate · Real Estate Investment Trusts · 4,866 employees
About Iron Mountain (Delaware)Common Stock REIT
IRM stock →Iron Mountain Incorporated is trusted by more than 240,000 customers in 61 countries, including approximately 95% of the Fortune 1000, to help unlock value and intelligence from their assets through services that transcend the physical and digital worlds. Our broad range of solutions address their information management, digital transformation, information security, data center and asset lifecycle management needs.
Real Estate · Real Estate Investment Trusts · 29,400 employees
AMT vs IRM FAQ
Which is bigger, American Tower (REIT) or Iron Mountain (Delaware)Common Stock REIT?
American Tower (REIT) (AMT) is larger, with a market capitalization of $77.69B compared with $33.63B for Iron Mountain (Delaware)Common Stock REIT (IRM).
Which stock has performed better over the past year, AMT or IRM?
IRM returned +7.19% over the past 12 months, compared with -10.16% for AMT (price return, excluding dividends). Past performance does not predict future results.
Which has the lower P/E ratio, AMT or IRM?
AMT has the lower trailing P/E at 22.9, versus 80.7 for IRM. A lower P/E is not by itself a sign of a better investment; it can reflect slower expected growth or higher risk.
Which pays a higher dividend, American Tower (REIT) or Iron Mountain (Delaware)Common Stock REIT?
American Tower (REIT) has the higher yield at 4.19%, compared with 2.99% for Iron Mountain (Delaware)Common Stock REIT.
Are American Tower (REIT) and Iron Mountain (Delaware)Common Stock REIT in the same industry?
Yes. Both are classified in the Real Estate Investment Trusts industry within the Real Estate sector.