Is ACM a Buy or a Sell? The Bull and Bear Case (2026)

Last updated July 2026

Short answer

Both cases are real, which is why the question is contested. The bull case for AECOM (ACM) rests on A record backlog that is growing faster than revenue: Total backlog reached a record $26.2 billion in the fiscal second quarter of 2026, up 8% year over year, with the design business booking 1.2 dollars of new work for every dollar burned. The bear case rests on the cash flow problem is the live issue and it is not resolved: operating cash flow fell 98% in the fiscal second quarter of 2026 and free cash flow went negative, while significant claims recorded in contract assets and other non-current assets grew to roughly $680 million from about $400 million at the September 2025 fiscal year end. Analysts covering it publish targets from $87.00 to $110.00 against a $74.93 price, so even the professionals disagree by 23% of their own average. We do not give a verdict. What follows is each case at full strength, so you can decide which set of assumptions you actually believe. Walnut is not an investment adviser.

AECOM is in the business of engineering expertise, not steel. The company plans, designs, engineers and manages infrastructure programs for governments and large corporations: highways and transit systems, water and wastewater treatment, airports and ports, environmental remediation, flood defenses, and increasingly the power and site work behind data centers. It reports in three segments, Americas (about $2.9 billion of quarterly revenue), International (about $890 million), and a small AECOM Capital investment arm, and employs roughly 51,000 people. Critically, AECOM exited self-perform construction years ago, so it no longer takes fixed-price building risk on its own balance sheet. What is left is a professional services business with very little capital intensity, which is why return on equity runs near 29% on only about $3.35 billion of debt against $1.04 billion of cash. The investment picture in August 2026 is a split screen. On one side, demand and profitability look excellent: fiscal second quarter 2026 (the quarter ended March 2026, reported May 11) delivered record second-quarter adjusted EBITDA of $312 million at a 16.5% margin, adjusted EPS of $1.59 up 27%, total backlog at a record $26.2 billion up 8%, and a design book-to-burn ratio of 1.2, and management raised full-year adjusted EPS guidance to $5.90 to $6.10. On the other side, cash collapsed in the same quarter: operating cash flow came in at $4 million, down 98% year over year, and adjusted free cash flow swung to negative $27.4 million from positive $178.4 million a year earlier. CFO Gaurav Kapoor attributed it to longer-than-anticipated claim resolution on certain projects, and the 10-Q showed significant claims recorded in contract assets rising to roughly $680 million from about $400 million six months earlier. Shares fell about 12% the next day and have not recovered. The stock now trades around 12 times forward earnings and roughly 9.9 times EV/EBITDA against a peer group closer to 13 times, which is the discount management itself has been pointing at in its slide decks.

The bull case: what would have to be true for $110.00

The most optimistic published target on ACM is $110.00, +46.8% from the $74.93 price as of August 2026. Getting there needs the following to work close to its best case, not merely to avoid going wrong.

1. A record backlog that is growing faster than revenue.

Total backlog reached a record $26.2 billion in the fiscal second quarter of 2026, up 8% year over year, with the design business booking 1.2 dollars of new work for every dollar burned. International backlog was the standout at a record $8.1 billion, up 25%, driven by wins in the United Kingdom and the Middle East. Management has also described double-digit pipeline growth for three consecutive quarters, which is the leading indicator that matters most in a bookings business.

2. Margin expansion in an asset-light model.

Americas adjusted operating margin on net service revenue hit a second-quarter record of 20.0%, up 60 basis points, and the consolidated segment margin target for fiscal 2026 is 16.8%. Management's stated long-term goal is segment margins above 20% by fiscal 2028, alongside 5% to 8% organic net service revenue growth and at least 15% annual growth in adjusted EPS and free cash flow per share. Because the business carries almost no capital intensity, incremental margin flows through to owners rather than into plants and equipment.

3. Sustained public infrastructure and water spending.

AECOM's revenue is anchored in multi-year government programs (transportation, water, environment, flood resilience) that are funded and scoped years before the design work is billed, which makes the top line less cyclical than a construction contractor's. Water and environmental work in particular has structural drivers independent of the economic cycle, including aging treatment plants, PFAS remediation and climate adaptation. The company has also been pushing an advisory practice and AI-enabled delivery to widen the addressable market beyond traditional design fees.

4. Steady share count reduction and a growing dividend.

AECOM returned $155 million to shareholders in the fiscal second quarter alone and more than $3.5 billion since September 2020, shrinking the diluted share count from about 161 million in fiscal 2020 to roughly 128.5 million today, a decline near 20%. The dividend, currently $1.24 a share for a yield around 1.7%, has compounded at roughly a 20% annual rate. That combination means per-share results can grow meaningfully faster than net service revenue, which is exactly what management's 15%-plus EPS framework assumes.

The bear case: what would have to be true for $87.00

The most pessimistic published target is $87.00, +16.1% from the current price. That is not a floor and not a forecast; it is roughly what one analyst thinks AECOM is worth if the risks below bite instead of the drivers above.

The cash flow problem is the live issue and it is not resolved: operating cash flow fell 98% in the fiscal second quarter of 2026 and free cash flow went negative, while significant claims recorded in contract assets and other non-current assets grew to roughly $680 million from about $400 million at the September 2025 fiscal year end. Full-year free cash flow guidance of roughly $400 million therefore depends on collecting a large amount in the back half, and if claims resolution keeps slipping, the reported earnings growth will look increasingly disconnected from cash. Several plaintiffs' firms (Pomerantz, Glancy Prongay, Schall, Howard G. Smith, Frank R. Cruz) announced securities-fraud investigations in May and June 2026 over the disclosures around that quarter; as of early August 2026 these appear to be investigations rather than a filed class action, but they are an open overhang. Government client concentration cuts both ways, exposing the company to budget cycles, appropriations delays and procurement slowdowns, and International net service revenue was already declining 3% in constant currency. Short interest sits near 6.7% of shares outstanding, and fiscal third quarter results are scheduled for August 10, 2026, which is a near-term catalyst in either direction.

The bear case deserves the same attention as the bull case, and usually gets less. If you are holding ACM already, the question is not whether these risks exist but whether any of them has moved from possible to actually happening in the reported numbers.

Where analysts land on ACM

12 analysts cover ACM, with an average target of $99.21 (+32.4% against $74.93) and a split of 11 buy, 2 hold, 0 sell. Bear in mind sell-side ratings skew positive across the whole market, so that split is not a balanced vote. The full target table, the recent rating actions by firm, and how the consensus has shifted are on the ACM forecast and price target page.

How is ACM valued? (as of August 2026)

Price

$74.93

Market cap

$9.63B

P/E (TTM)

15.64

Forward P/E

11.15

Price / book

4.23

Beta

0.92

52-week range

$66.28 to $135.52

Snapshot for ACM as of August 2026, sourced from Yahoo Finance and may be delayed. Valuation figures move with price and earnings; verify the current numbers with your broker before deciding.

Revenue (TTM): ~$16.0 billion, with net service revenue near $1.95 billion a quarter
Fiscal 2026 guidance: ~$5.90 to $6.10 adjusted EPS, ~$1.275 to $1.305 billion adjusted EBITDA, ~$400 million free cash flow
Total backlog: ~$26.2 billion, a record, up ~8% year over year
Adjusted EBITDA margin: ~16.5% in fiscal Q2 2026, with Americas segment margin at ~20.0%
Free cash flow (TTM): ~$410 million, but negative ~$27 million in fiscal Q2 2026 alone
Market cap / valuation: ~$9.6 billion at ~$75 a share, ~12x forward earnings and ~9.9x EV/EBITDA

The valuation reflects skepticism about cash conversion, not about the order book. At roughly 12 times forward earnings and about 9.9 times EV/EBITDA, AECOM prices below an engineering and consulting peer group closer to 13 times, despite carrying higher margins than the peer average, a gap management has explicitly flagged in its investor slides. Trailing GAAP metrics look less flattering (net income of about $506 million on $16.0 billion of revenue is a 3.2% margin, giving a trailing P/E near 19.5), which is why the forward and trailing multiples tell such different stories. Return on equity near 29% and a share count down roughly 20% since 2020 are what the forward multiple is capitalizing.

How do you decide if ACM is a buy?

Rather than asking whether ACM is a buy in the abstract, it tends to help to answer four questions:

Thesis: do you believe the bull case above, and is it still true today?
Time horizon: a single stock can be volatile, so a longer horizon absorbs more of the swings.
Position sizing: a thesis can be right and the sizing still wrong; decide how much of your portfolio one name should be.
Overlap: check whether you already hold ACM indirectly through an index or sector ETF before adding more.

What would change your mind on ACM

Write the tripwires down before you need them. Deciding what would falsify your view is far harder once a position is moving against you.

Bull case breaks if: A record backlog that is growing faster than revenue stalls in the reported numbers rather than in the narrative around them.
Bear case breaks if: the cash flow problem is the live issue and it is not resolved: operating cash flow fell 98% in the fiscal second quarter of 2026 and free cash flow went negative, while significant claims recorded in contract assets and other non-current assets grew to roughly $680 million from about $400 million at the September 2025 fiscal year end fails to materialise over several reporting periods while the drivers keep compounding.
Neither matters if: the position has grown large enough that being wrong would damage the whole portfolio. Sizing overrides the argument.

For the full picture, see the ACM stock guide (what the company does, the ETFs that hold it, similar stocks, and the themes it fits). In Walnut you can ask its AI about ACM against your real portfolio and see your actual exposure before deciding.

Investing in AECOM with AI

Connect the broker you already use and ask Walnut's AI how ACM fits what you actually hold: whether you own it already through a fund, what it would do to your concentration, and how it has tracked the S&P 500. Read-only by default, and you approve anything before it reaches your broker.

See how it fits your portfolio

FAQ

Is ACM a good stock to buy right now?

That depends on which case you find more convincing, and both are on this page. The bull case rests on A record backlog that is growing faster than revenue, with revenue (ttm) at ~$16.0 billion, with net service revenue near $1.95 billion a quarter. The bear case rests on the cash flow problem is the live issue and it is not resolved: operating cash flow fell 98% in the fiscal second quarter of 2026 and free cash flow went negative, while significant claims recorded in contract assets and other non-current assets grew to roughly $680 million from about $400 million at the September 2025 fiscal year end. Analysts covering it are spread from $87.00 to $110.00, which is itself a signal that this is genuinely contested. If you believe the thesis, the real questions become sizing and overlap rather than timing. Walnut is not an investment adviser and this is not a recommendation.

Should I sell ACM?

Nobody can answer that for you, and the honest version of the question is narrower: has anything changed in the reason you bought it? The bear case on this page is the place to check. The cash flow problem is the live issue and it is not resolved: operating cash flow fell 98% in the fiscal second quarter of 2026 and free cash flow went negative, while significant claims recorded in contract assets and other non-current assets grew to roughly $680 million from about $400 million at the September 2025 fiscal year end. If that risk is what you were worried about and it is now playing out, that is a real signal. If the price simply fell while the thesis held, that is a different situation entirely. The most pessimistic published target is $87.00, +16.1% from the $74.93 price, which is one analyst's downside case rather than a floor. Walnut is not an investment adviser.

What is the bull case for ACM?

A record backlog that is growing faster than revenue. Total backlog reached a record $26.2 billion in the fiscal second quarter of 2026, up 8% year over year, with the design business booking 1.2 dollars of new work for every dollar burned. The most optimistic analyst target on ACM is $110.00, +46.8% from the $74.93 price. That figure is only reachable if this thesis works close to its best case.

What is the bear case for ACM?

What does AECOM do?

AECOM is the world's largest infrastructure consulting firm by design revenue, an asset-light engineering, environmental and program management business.

What would have to change for ACM to stop being worth holding?

Decide that in advance, because it is far harder to think clearly once a position is moving against you. The concrete tripwires here: the driver behind the bull case (A record backlog that is growing faster than revenue) stalling in the reported numbers rather than in the narrative, the risk above (the cash flow problem is the live issue and it is not resolved: operating cash flow fell 98% in the fiscal second quarter of 2026 and free cash flow went negative, while significant claims recorded in contract assets and other non-current assets grew to roughly $680 million from about $400 million at the September 2025 fiscal year end) turning from a possibility into a reported fact, or the position growing large enough that a bad outcome would matter to your whole portfolio regardless of who is right.

What does AECOM actually do?

It is a professional infrastructure consulting firm: planning, engineering design, architecture, environmental services, advisory and program management for governments and large corporations. Projects span transportation, water and wastewater, airports, environmental remediation, flood resilience and energy. Roughly 51,000 employees generate about $16.0 billion of trailing revenue across three segments, Americas, International and a small AECOM Capital investment arm. AECOM no longer performs its own construction.

Why has the stock fallen so much in 2026?

Cash, not earnings. On May 11, 2026, AECOM reported fiscal second quarter operating cash flow of $4 million, down 98% year over year, and adjusted free cash flow of negative $27.4 million against positive $178.4 million a year earlier. Shares fell about 12% the next day to $69.95. That came on top of an earlier revenue miss, and the stock has traded from a 52-week high of $135.52 to around $75.

What is the claims issue that hurt cash flow?

AECOM performs work on projects where the final compensation is disputed or subject to change orders, and those amounts sit on the balance sheet as claims within contract assets until they are settled and collected. CFO Gaurav Kapoor cited longer-than-anticipated claim resolution on certain projects. Significant claims recorded in contract assets and other non-current assets grew to roughly $680 million as of March 31, 2026, from about $400 million at the September 2025 fiscal year end.

Walnut is informational, not investment advice, and gives no verdict on ACM. Analyst targets referenced here come from a August 2026 pull of published third-party research and change constantly. Verify current figures with your broker before acting on them.