Iron Mountain (Delaware)Common Stock REIT (IRM) vs Realty Income (O)
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 Realty Income (O) over the past year, gaining 9.3% versus a loss of 10.5%. Over five years, IRM leads with a +157.9% price change compared with -21.0% for O. Realty Income is the larger company by market cap ($50.44 billion vs $33.86 billion), about 1.5 times the size, while Iron Mountain (Delaware)Common Stock REIT is growing revenue faster (+12.2% vs +9.1%).
On valuation, Realty Income trades at a lower forward P/E (34.3x vs 41.7x for Iron Mountain (Delaware)Common Stock REIT). Realty Income offers the higher dividend yield (6.07% vs 2.97%). Realty Income converts more of its revenue into profit, with a net margin of 18.4% 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 | IRM | O |
|---|---|---|
| Share price | $113.74 | $53.31 |
| Market cap | $33.86B | $50.44B |
| 1-day change | -1.74% | -0.08% |
| YTD return | +39.54% | -5.36% |
| 1-year return | +9.31% | -10.53% |
| 5-year return | +157.91% | -20.96% |
| P/E ratio (TTM) | 81.24 | 38.63 |
| Forward P/E | 41.71 | 34.32 |
| EPS (TTM) | $1.40 | $1.38 |
| Dividend yield | 2.97% | 6.07% |
| Annual dividend | $3.38 | $3.24 |
| Revenue (latest FY) | $6.90B | $5.75B |
| Revenue growth (YoY) | +12.23% | +9.07% |
| Net income (latest FY) | $152.25M | $1.06B |
| Gross margin | 55.38% | — |
| Operating margin | 16.86% | — |
| Net margin | 2.21% | 18.41% |
| 52-week high | $134.68 | $67.94 |
| 52-week low | $77.77 | $53.15 |
| Distance from 52-week high | -15.55% | -21.54% |
| Analyst consensus | buy | hold |
| Avg. price target upside | +27.56% | +24.55% |
| Average volume | 1.73M | 6.48M |
| Shares outstanding | 297.70M | 946.22M |
| Employees | 29,400 | 544 |
| 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
- IRM has outperformed O by 19.8 percentage points over the past year.
- Iron Mountain (Delaware)Common Stock REIT trades at a higher earnings multiple (81.2x vs 38.6x trailing P/E).
- Realty Income offers a meaningfully higher dividend yield (6.07% vs 2.97%).
- Realty Income is more profitable, keeping 18.4 cents of every revenue dollar as net income versus 2.2 cents for Iron Mountain (Delaware)Common Stock REIT.
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
About Realty Income
O stock →Realty Income Corporation, an S&P 500 company, is real estate partner to the world's leading companies. Founded in 1969, we serve our clients as a full-service real estate capital provider.
Real Estate · Real Estate Investment Trusts · 544 employees
IRM vs O FAQ
Which is bigger, Iron Mountain (Delaware)Common Stock REIT or Realty Income?
Realty Income (O) is larger, with a market capitalization of $50.44B compared with $33.86B for Iron Mountain (Delaware)Common Stock REIT (IRM).
Which stock has performed better over the past year, IRM or O?
IRM returned +9.31% over the past 12 months, compared with -10.53% for O (price return, excluding dividends). Past performance does not predict future results.
Which has the lower P/E ratio, IRM or O?
O has the lower trailing P/E at 38.6, versus 81.2 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, Iron Mountain (Delaware)Common Stock REIT or Realty Income?
Realty Income has the higher yield at 6.07%, compared with 2.97% for Iron Mountain (Delaware)Common Stock REIT.
Are Iron Mountain (Delaware)Common Stock REIT and Realty Income in the same industry?
Yes. Both are classified in the Real Estate Investment Trusts industry within the Real Estate sector.