AECOM (ACM) is back in focus after unusual options activity, with the Sep 18, 2026 $135 calls showing some of the highest implied volatility among equities as traders position for a sizable stock move.

AECOM shares closed at US$62.78 on Tuesday, with the stock down 34.88% on a year to date share price basis and the 1 year total shareholder return down 49.33%, as investors reacted to the surprise US$337 million pre tax charge, recent earnings miss and record backlog headlines.

Scan how traders are reacting to similar construction and infrastructure stories by checking the hand picked list of solid balance sheet and fundamentals (51 results) alongside AECOM's recent options driven volatility.

AECOM has a large global infrastructure business and a record backlog, yet the stock is trading near 5 year lows after the charge driven loss. Is that a solid franchise at a weak price, or a value trap?

Most Popular Narrative: 30.2% Undervalued

AECOM's most followed narrative pegs fair value at $90.00 per share, well above Tuesday's $62.78 close. This puts the recent options spike into sharper context.

AECOM's Q3 is not a clean quarter. It is a revealing one.

A legacy Construction Management project created a $337 million hole in reported profitability.

Want to see why this narrative still assigns a premium value to AECOM? The key piece is how record backlog, margins and mix all feed into that $90.00 figure.

Result: Fair Value of $90.00 (UNDERVALUED)

However, this AECOM narrative still faces real risks if additional legacy project issues emerge or if record backlog fails to translate into the expected profitability.

Next Steps

With mixed sentiment around AECOM's setbacks and opportunities, it makes sense to move fast and look at the underlying data yourself. Start by weighing the 4 key rewards and 2 important warning signs.

Looking for more ideas beyond AECOM?

If AECOM has your attention, do not stop there. Broader opportunities often emerge when you compare a few different high quality ideas side by side.

• Target potential mispricings by scanning companies that combine quality with attractive valuations using the 49 high quality undervalued stocks.
• Prioritise resilience by reviewing stocks that show stronger balance sheets and fundamentals with the list of solid balance sheet and fundamentals (51 results).
• Hunt for less crowded opportunities by checking the 18 high quality undiscovered gems before the wider market catches on.

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.