Sifting through countless of stocks in the Specialized REITs industry can be tedious, and sometimes two stocks are just too similar to judge which is the better investment. If you’re on the fence about investing in Iron Mountain Incorporated or Lamar Advertising Company because you’re not sure how they measure up, it’s important to compare them on a few factors before making your decision.

Read on to learn how Iron Mountain Incorporated and Lamar Advertising Company compare based on key financial metrics to determine which better meets your investment needs.

About Iron Mountain Incorporated and Lamar Advertising Company

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. Iron Mountain Incorporated is based in Portsmouth, New Hampshire. Iron Mountain Incorporated was founded in 1951 and is incorporated in Delaware and is based in Portsmouth, New Hampshire.

Lamar Advertising Company is one of the largest outdoor advertising companies in North America, with over 362,000 displays across the United States and Canada. Lamar offers advertisers a variety of billboards, interstate logo, transit and airport advertising formats, helping both local businesses and national brands reach broad audiences every day. In addition to its more traditional out-of-home inventory, Lamar is proud to offer its customers the largest network of digital billboards in the United States with over 5,400 displays. Lamar Advertising Company was founded and incorporated in 1902 in Delaware and is based in Baton Rouge, United States.

Latest Specialized REITs and Iron Mountain Incorporated, Lamar Advertising Company Stock News

As of September 1, 2026, Iron Mountain Incorporated had a $34.0 billion market capitalization, compared to the Specialized REITs median of $7.6 million. Iron Mountain Incorporated’s stock is up 34.8% in 2026, down 7.9% in the previous five trading days and up 23.71% in the past year.

Currently, Iron Mountain Incorporated’s price-earnings ratio is 81.4. Iron Mountain Incorporated’s trailing 12-month revenue is $7.6 billion with a 5.5% net profit margin. Year-over-year quarterly sales growth most recently was 18.5%. Analysts expect adjusted earnings to reach $2.481 per share for the current fiscal year. Iron Mountain Incorporated currently has a 3.0% dividend yield.

As of September 1, 2026, Lamar Advertising Company had a $15.3 billion market cap, putting it in the 83rd percentile of all stocks. Lamar Advertising Company’s stock is up 19.7% in 2026, down 0.3% in the previous five trading days and up 18.73% in the past year.

Currently, Lamar Advertising Company’s price-earnings ratio is 27.6. Lamar Advertising Company’s trailing 12-month revenue is $2.3 billion with a 23.9% net profit margin. Year-over-year quarterly sales growth most recently was 6.5%. Analysts expect adjusted earnings to reach $5.918 per share for the current fiscal year. Lamar Advertising Company currently has a 4.4% dividend yield.

How We Compare Iron Mountain Incorporated and Lamar Advertising Company Stock Grades

Stock evaluation requires access to huge amounts of data and the knowledge and time to sift through it all, make sense of financial ratios, read income statements and analyze recent stock movements. AAII created A+ Investor, a robust data suite that condenses data research in an actionable and customizable way suitable for investors of all knowledge levels, to help investors streamline and work through such data.

AAII’s proprietary stock grades come with A+ Investor. These offer intuitive A‐F grades for each of five key investing factors: value, growth, momentum, earnings estimate revisions and quality. Here, we’ll take a closer look at Iron Mountain Incorporated and Lamar Advertising Company’s stock grades to see how they measure up against one another.

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Iron Mountain Incorporated and Lamar Advertising Company Growth Grades

Company	Ticker	Growth
Iron Mountain Incorporated	IRM	A
Lamar Advertising Company	LAMR	A

The foundation of growth investing is seeking out stocks of companies exhibiting strong, consistent and prolonged growth that is expected to continue into the future.

In order to compute the growth score and assign it a letter grade, the percentile ranks for each of three components‐consistency of annual sales growth, five-year sales growth rankings adjusted for extreme levels, and consistency of positive annual cash from operations‐must be determined. These three rank figures are added together, and the sum is ranked against the entire stock universe to arrive at a company’s Growth Score to create an equal distribution of grades.

The companies in the bottom 20% of the stock universe receive Growth Grades of F, considered to be very weak, while those in the top 20% receive A grades, which are considered very strong.

Iron Mountain Incorporated has a Growth Score of 89, which is Very Strong. Lamar Advertising Company has a Growth Score of 100, which is Very Strong.

The Growth Grade Winner: It’s a Tie!

Looking at the Growth Grade breakdown above, both Iron Mountain Incorporated and Lamar Advertising Company have a grade of A. For investors who focus solely on a company’s upward growth, further research should be conducted into both companies’ other financial metrics before deciding whether to invest.

Iron Mountain Incorporated and Lamar Advertising Company’s Momentum Grades

Company	Ticker	Momentum
Iron Mountain Incorporated	IRM	C
Lamar Advertising Company	LAMR	C

Momentum grades help to uncover stocks experiencing anomalously high rates of return; research finds that stocks with high relative levels of momentum tend to outperform, whereas those with low levels of momentum tend to continue underperforming. Momentum is based on the price change of a stock over a specified period relative to all other stocks.

Typically, AAII looks at the weighted relative strength over the trailing four quarters. The weighted four-quarter relative strength rank is the relative price change for each of the past four quarters. The most recent quarterly price change is given a weight of 40% and each of the three previous quarters are given a weighting of 20%.

Iron Mountain Incorporated has a Momentum Score of 52, which is Average. Lamar Advertising Company has a Momentum Score of 53, which is Average.

The Momentum Stock Winner: No Clear Winner

Neither Iron Mountain Incorporated or Lamar Advertising Company has a strong enough Momentum Grade to be considered a “winner.” Investors considering these companies should do additional due diligence and research to see if either could be a good addition to their portfolios. It’s important to look at a wide range of financial metrics in order to determine if Iron Mountain Incorporated or Lamar Advertising Company is the better investment when it comes to momentum.

Iron Mountain Incorporated and Lamar Advertising Company’s Estimate Revisions Grades

Company	Ticker	Earnings Estimate
Iron Mountain Incorporated	IRM	C
Lamar Advertising Company	LAMR	A

Earnings estimate revisions scores consider the magnitude of a company’s earnings surprise in its last two reported fiscal quarters. Often, positive surprises beget further positive surprises‐or at least continued sales growth (the exact opposite is generally true, too).

Estimate revisions offer an indication of what analysts are thinking about the short-term prospects of a firm. Estimate revisions are based on the statistical significance of a firm’s last two quarterly earnings surprises and the percentage change in its consensus estimate for the current fiscal year over the past month and past three months.

Iron Mountain Incorporated has a Earnings Estimate Score of 57, which is Neutral. Lamar Advertising Company has a Earnings Estimate Score of 99, which is Very Positive.

The Earnings Estimate Revisions Grade Winner: Lamar Advertising Company

As you can clearly see from the Earnings Estimate Revisions Grade breakdown above, Lamar Advertising Company has a better Earnings Estimate Revisions Grade than Iron Mountain Incorporated. For those who are specifically looking for companies with better short-term prospects when compared to other companies in the same industry, Lamar Advertising Company could be a good stock to invest in. However, it’s important to analyze multiple factors based on a wide range of metrics before deciding whether to buy.

Other Iron Mountain Incorporated and Lamar Advertising Company Grades

In addition to Momentum, Estimate Revisions and Growth, A+ Investor also provides grades for Value and Quality.

Successful stock investing involves buying low and selling high, so stock valuation is an important consideration for stock selection. Buying stocks that are going to go up typically means buying stocks that are undervalued in the first place, although momentum investors may argue that point.

AAII’s A+ Investor Quality Grade comes from the ranking of key metrics. Specifically, the quality grade is the percentile rank of the composite of return on assets (ROA), return on invested capital (ROIC), gross profit relative to assets, buyback yield, change in total liabilities to assets, accruals, Z double prime bankruptcy risk (Z) score and F-Score.

These 2 key factors, when combined with the above, provide a holistic view into a particular stock. Further, by joining A+ Investor you can see whether Iron Mountain Incorporated and Lamar Advertising Company pass any of our 60+ stock screens that have outperformed the market since their creation.

So, Which Is the Better Investment, Iron Mountain Incorporated or Lamar Advertising Company Stock?

Overall, Iron Mountain Incorporated stock has a Growth Score of 89, Momentum Score of 52 and Estimate Revisions Score of 57.

Lamar Advertising Company stock has a Growth Score of 100, Momentum Score of 53 and Estimate Revisions Score of 99.

Comparing Iron Mountain Incorporated and Lamar Advertising Company’s grades, scores and metrics can act as a solid basis to determine whether they may be a good investment or not. You’ll also want to look at your portfolio’s asset allocation as well as your risk tolerance and financial goals to see if either of these stocks would make a good fit for you. AAII can help you figure out which investments align with your individual needs and preferences.

Investors are encouraged to do their own due diligence and research. In this way, individuals can effectively become managers of their own assets‐without having to rely on others for financial independence. You can count on AAII for timeless articles on financial planning and stock-picking, unbiased research and actionable analysis.

A+ Investor adds to our qualitative teaching with a powerful data suite to help you whittle down investment choices to find stocks, exchange-traded funds (ETFs) or mutual funds that meet your needs.

AAII Disclaimer

We make no representations or warranties that any investor will, or is likely to, achieve profits similar to those shown, because past, hypothetical or simulated performance is not necessarily indicative of future results. Before making an investment decision, you should consider your circumstances and whether the information on our content is applicable to your situation. This information was prepared in good faith, and we accept no liability for any errors or omissions. The full disclaimer can be read here.