On trailing earnings, O is cheaper: IRM trades at a 145.54 P/E and O at 51.74.

Which has grown faster, IRM or O?

Over the past five years, O grew revenue faster — IRM at a 11.73% CAGR versus O at 28.65%.

Does IRM or O pay a bigger dividend?

IRM yields 2.61% and O yields 5.15% based on trailing dividends and the latest price.

Is IRM or O more profitable?

O runs the higher net margin — IRM at 3.76% versus O at 18.94%.

Which has been the better investment, IRM or O?

Over the past 10-year, IRM delivered the higher annualized total return — IRM at 19.69% versus O at 4.74%. Past performance doesn't predict future results.

Iron Mountain Incorporated (IRM) vs Realty Income Corporation (O)

O leads on 10 of 13 compared metrics.

A side-by-side comparison of Iron Mountain Incorporated and Realty Income Corporation across valuation, profitability, dividends, and growth — built entirely from reported fundamentals, as of June 27, 2026. The ● marks the stronger figure on each row (cheaper multiple, higher margin/return).

IRM

Iron Mountain Incorporated

$39.40B

$132.44Real Estate

Realty Income Corporation

$58.86B

$63.12Real Estate

Total return — IRM vs O

growth of $100 · last 30y

IRM +2316.8%O +520.6%IRM compounded faster

IRM O

IRM vs O: by the numbers

•O is the larger company ($58.86B vs $39.40B market cap).
•O trades at the lower earnings multiple (51.74 vs 145.54 P/E).
•O converts more revenue to profit (18.94% vs 3.76% net margin).
•O grew revenue faster over the past five years (28.65% vs 11.73% CAGR).
•O pays the higher dividend yield (5.15% vs 2.61%).

Which is better, IRM or O?

Metric tally: IRM 3 · O 10

It depends on what you're optimizing for:

ValueO(lower P/E)

GrowthO(faster 5Y revenue CAGR)

IncomeO(higher dividend yield)

QualityIRM(higher ROIC)

Metrics side by side

Valuation

Metric	IRM	O
P/E ratio	145.54	51.74●
Forward P/E	50.93	35.05●
P/S ratio	5.46●	9.65
P/B ratio	—	1.46
PEG ratio	—	2.49
EV / EBITDA	25.33	20.57●

Profitability

Metric	IRM	O
Gross margin	25.69%	89.80%●
Operating margin	18.01%	29.27%●
Net margin	3.76%	18.94%●
ROE	-14.74%	2.86%●
ROIC	5.72%●	2.45%

Dividends

Metric	IRM	O
Dividend yield	2.61%	5.15%●
Payout ratio	705.31%	277.95%

Growth (annualized)

Metric	IRM	O
Revenue CAGR (5Y)	11.73%	28.65%●
EPS CAGR (5Y)	-16.26%	0.35%●
Total return CAGR (5Y)	30.08%●	4.30%

Frequently asked

Which is better, IRM or O?: It depends on your goal. value: O (lower P/E); growth: O (faster 5Y revenue CAGR); income: O (higher dividend yield); quality: IRM (higher ROIC). Across all compared metrics, O leads 10 to 3.
Is IRM or O cheaper?: On trailing earnings, O is cheaper: IRM trades at a 145.54 P/E and O at 51.74.
Which has grown faster, IRM or O?: Over the past five years, O grew revenue faster — IRM at a 11.73% CAGR versus O at 28.65%.
Does IRM or O pay a bigger dividend?: IRM yields 2.61% and O yields 5.15% based on trailing dividends and the latest price.
Is IRM or O more profitable?: O runs the higher net margin — IRM at 3.76% versus O at 18.94%.
Which has been the better investment, IRM or O?: Over the past 10-year, IRM delivered the higher annualized total return — IRM at 19.69% versus O at 4.74%. Past performance doesn't predict future results.

Go deeper

Full IRM analysis Full O analysis Interactive comparison tool

Dig into the metrics

Iron Mountain P/E ratio Realty Income P/E ratio Iron Mountain dividend yield Realty Income dividend yield Iron Mountain ROE Realty Income ROE Iron Mountain operating margin Realty Income operating margin Iron Mountain revenue growth Realty Income revenue growth Iron Mountain free cash flow Realty Income free cash flow

Iron Mountain & Realty Income appear in these rankings

Highest Dividend Yield Stocks Dividend Aristocrats Fastest Revenue Growth Stocks Highest FCF Yield Stocks

Figures are sourced from reported fundamentals and the latest end-of-day price. This comparison is informational only and is not investment advice. Past performance does not predict future results. See our methodology. Compiled by TGMCharts Research · data verified June 27, 2026.