Fastly stock has surged over the past year, yet the valuation signals are split, with a Discounted Cash Flow (DCF) intrinsic value estimate pointing to meaningful upside while market based multiples suggest the shares already trade at a premium.

• Fastly has delivered a 178.0% return over the past year, which puts extra focus on whether that rerating is supported by the underlying value of the business.
• The recent partnership with Skyfire can support expectations for Fastly's edge cloud and security offerings, while execution risk around turning AI agent traffic into dependable, monetizable revenue remains an overhang for valuation.
• On Simply Wall St's checks, Fastly screens as neither clearly cheap nor clearly expensive overall, with 3 of 6 valuation checks suggesting value and the rest pointing to less attractive pricing.

The issue now is whether Fastly's recent share price strength leaves enough margin between the current market value and its intrinsic value estimate to justify taking on the risks in the story.

Is Fastly Still Cheap on Cash Flow?

The Discounted Cash Flow (DCF) approach estimates what Fastly’s future cash generation could be worth in today’s dollars. For Fastly, the model uses latest twelve month free cash flow of about $55.9 million in $ and assumes that cash flows keep growing from this base over time. On that basis, the DCF model arrives at an intrinsic value estimate of about $25 per share.

Compared with the current share price, this implies Fastly is trading at roughly a 21.2% discount to that intrinsic value, so the stock screens as undervalued on this cash flow view. The recently announced Skyfire partnership, which targets secure and monetizable AI agent traffic on Fastly’s edge platform, helps explain why some investors may see more upside in the company’s future cash flows than the current price reflects.

On the DCF numbers alone, Fastly stock looks undervalued relative to the cash flows analysts expect it to generate.

Our Discounted Cash Flow (DCF) analysis suggests Fastly is undervalued by 21.2%. Track this in your watchlist or portfolio, or discover 44 more high quality undervalued stocks.

Does Fastly Look Pricey on Sales?

The price-to-sales (P/S) ratio is a useful way to look at Fastly because earnings are not the main driver yet and sales give a clearer snapshot of what the market is willing to pay for each dollar of revenue.

Fastly trades on a P/S ratio of about 4.7x, which is higher than the IT industry average of roughly 1.9x but below the broader peer group average of about 8.8x. The fair P/S multiple implied by Simply Wall St’s model is around 3.0x, based on factors such as Fastly’s growth profile, margins, size and risk. That leaves the current multiple above what the model suggests would be a more balanced price for the stock.

Even after considering Fastly’s edge cloud positioning and the Skyfire partnership, the shares appear expensive compared with this tailored P/S benchmark.

On the P/S multiple, Fastly stock appears overvalued relative to the level that the fair ratio implies.

The Fastly Narrative: What Would Justify Today's Price?

Simply Wall St Narratives for Fastly pick up where this valuation puzzle leaves off by explaining which views on Fastly's future growth, margins and earnings would need to be correct for the stock to be worth materially more or less than it is today, and they sit on the company’s Community page. Each Narrative links its number to a clear stance on how Fastly's growth, profitability and risks might develop, giving you something concrete to revisit as new information becomes available.

Community views on Fastly sit far apart, with one camp focused on AI driven upside and another warning the story has already run ahead of value.

Bull case: 18% undervalued

"Successful execution of a platform-based cross-sell and upsell strategy (with nearly 50% of customers now using 2+ products and these generating over 75% of revenue) boosts wallet share, increases net retention rates, and supports higher revenue per customer..."

Bear case: 297% overvalued

"It is time to look at which companies actually benefit from the astronomical increase in usage of LLM's and coding tools..."

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

The Bottom Line

For Fastly, the Discounted Cash Flow (DCF) intrinsic value estimate points to meaningful undervaluation, while the market based P/S multiple still screens as overvalued. That split largely comes down to how much weight you put on future cash generation versus current growth expectations and sentiment around edge and AI related demand. With broader valuation checks sitting in the middle, the key question is whether Fastly can turn AI agent traffic and broader platform adoption into durable, high quality cash flows. The way that execution story unfolds is likely to matter more from here than any single valuation metric on its own.

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.