• For readers wondering if MasTec at around US$375 a share still offers value, or if the big move is already behind it, this article walks through the numbers so you can judge for yourself.
• The stock has returned 1.0% over the last week, 18.7% over the last month, 64.8% year to date, and 194.4% over the past year, with a 3-year return of 331.0% and 5-year return of 250.0%.
• Recent coverage has focused on MasTec's role in large-scale infrastructure and energy-related projects and how that positions the company in its industry. These themes help frame why the share price has been so active over multiple time frames.
• Despite those strong returns, MasTec currently holds a valuation score of 0 out of 6. The next sections will walk through traditional valuation checks like P/E and discounted cash flow, before finishing with a more holistic way to think about what this price might mean for long-term investors.

MasTec scores just 0/6 on our valuation checks. See what other red flags we found in the full valuation breakdown.

Approach 1: MasTec Discounted Cash Flow (DCF) Analysis

A Discounted Cash Flow, or DCF, model takes estimates of the cash MasTec could generate in the future and discounts those projections back into today’s dollars to arrive at an estimated intrinsic value per share.

MasTec’s latest twelve month free cash flow is reported at $322.8 million. Analyst and extrapolated projections used in this 2 Stage Free Cash Flow to Equity model show annual free cash flow figures stepping up to a projected $1,490.3 million in 2030, with values between 2026 and 2035 ranging from $811.5 million to $1,883.8 million before discounting.

When all those future cash flows are discounted back, the model arrives at an estimated fair value of about $322 per share. Compared with a current share price around $375, the DCF indicates that, on this set of assumptions, MasTec may be approximately 16.5% overvalued.

Result: OVERVALUED

Our Discounted Cash Flow (DCF) analysis suggests MasTec may be overvalued by 16.5%. Discover 53 high quality undervalued stocks or create your own screener to find better value opportunities.

Approach 2: MasTec Price vs Earnings

For profitable companies, the P/E ratio is a useful shorthand because it tells you how many dollars investors are paying for each dollar of earnings. It brings earnings, which ultimately support shareholder returns, directly into the valuation conversation.

What counts as a reasonable P/E depends on what investors expect for future growth and how much risk they see in the business. Higher expected growth or lower perceived risk can support a higher P/E, while slower growth or higher risk usually calls for a lower one.

MasTec currently trades on a P/E of 73.12x. That is above the Construction industry average of 43.97x and also above the peer group average of 39.63x. Simply Wall St’s Fair Ratio framework estimates what a more appropriate P/E might be for MasTec at around 36.86x, based on factors such as its earnings growth profile, industry, profit margins, market cap and company specific risks.

This Fair Ratio approach can be more informative than a simple comparison with peers or the industry, because it adjusts for MasTec’s own characteristics rather than assuming all companies deserve the same multiple. Comparing the current 73.12x P/E with the Fair Ratio of 36.86x suggests the shares are pricing in a higher valuation than this model supports.

Result: OVERVALUED

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Upgrade Your Decision Making: Choose your MasTec Narrative

Earlier it was mentioned that there is an even better way to understand valuation, so Narratives are introduced here as a simple way for you to attach a clear story about MasTec to specific numbers for revenue, earnings, margins and fair value, then see how that story stacks up against the current price.

On Simply Wall St’s Community page, Narratives let you say what you think is happening at a company, link that story directly to a forecast and a fair value, and then compare that fair value with today’s share price to judge whether the stock looks expensive or cheap on your assumptions, rather than anyone else’s.

Narratives are not static. They update when fresh information such as earnings, guidance or news is added, so your fair value view automatically reflects the latest assumptions rather than quickly going out of date.

For MasTec, one investor might line up with the more cautious view and pin fair value closer to about US$205 based on concerns around execution and backlog risk. Another might lean into the more optimistic view that points toward US$400, and Narratives make that spread visible so you can see exactly which revenue growth, margin and P/E assumptions you agree with before making any decision.

For MasTec, here are previews of two leading MasTec Narratives for you to review:

Fair value in this bullish narrative: US$400.00 per share.

Implied pricing gap to that fair value at the recent US$375.09 share price is about 6.2% below the narrative fair value.

Revenue growth assumption: 16.6% a year.

• Backlog tied to data centers, renewables, power delivery and communications is expected to support higher earnings and margin expansion over several years.
• Analysts in this camp model earnings of about US$1.1b by 2029 and a future P/E of around 36.7x, which is above the current US Construction industry level cited in the narrative.
• Key risks include exposure to fossil fuel pipeline work, cost and execution pressures on large projects, acquisition integration, new technologies in construction and tighter ESG rules.

Fair value in this bearish narrative: about US$265.67 per share.

Implied pricing gap to that fair value at the recent US$375.09 share price is about 41.2% above the narrative fair value.

Revenue growth assumption: 12.9% a year.

• This view leans on concerns that communications and power delivery may not fully meet demand expectations and that earnings could be affected when large pipeline projects finish.
• Analysts in this camp tie their fair value to earnings of about US$814.1m by 2029 on a future P/E near 32.9x, which is below the Construction industry P/E cited in the narrative.
• Risks that could weigh on this case include project timing swings, political and policy uncertainty, backlog lumpiness and the need for clean execution across all segments to support current market expectations.

Together, these two Narratives outline a range for what MasTec might be worth based on different assumptions about growth, margins, project delivery and the P/E investors are willing to pay. Your next step is to consider which story you find more realistic and adjust the numbers to match your own view of the business.

To see how these results tie into long-term growth, risks, and valuation, check out the full range of community narratives for MasTec on Simply Wall St. Add the company to your watchlist or portfolio so you'll be alerted when the story evolves.

Do you think there's more to the story for MasTec? Head over to our Community to see what others are saying!

This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.