TTEK vs ACM

For growth investors, Tetra Tech, Inc.

(TTEK) is the stronger pick with 4. 7% revenue growth year-over-year, versus 0. 2% for Aecom (ACM). Aecom (ACM) offers the better valuation at 19. 9x trailing P/E (14. 2x forward), making it the more compelling value choice. Analysts rate Aecom (ACM) a "Buy" — based on 25 analyst ratings — the highest consensus in this comparison. The "better buy" depends entirely on your goals: growth investors should weight revenue trajectory, value investors should weight P/E and PEG, and income investors should weight dividend yield and streak.

On trailing P/E, Aecom (ACM) is the cheapest at 19.

9x versus Tetra Tech, Inc. at 33. 3x. On forward P/E, Aecom is actually cheaper at 14. 2x.

Over the past 5 years, Tetra Tech, Inc.

(TTEK) delivered a total return of +28. 7%, compared to +27. 3% for Aecom (ACM). Over 10 years, the gap is even starker: TTEK returned +451. 8% versus ACM's +172. 9%. Past returns do not guarantee future results, and the stock with the higher historical return may already have its best growth priced in.

By beta (market sensitivity over 5 years), Tetra Tech, Inc.

(TTEK) is the lower-risk stock at 0. 53β versus Aecom's 0. 92β — meaning ACM is approximately 72% more volatile than TTEK relative to the S&P 500. On balance sheet safety, Tetra Tech, Inc. (TTEK) carries a lower debt/equity ratio of 55% versus 125% for Aecom — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), Tetra Tech, Inc.

(TTEK) is pulling ahead at 4. 7% versus 0. 2% for Aecom (ACM). On earnings-per-share growth, the picture is similar: Aecom grew EPS 42. 7% year-over-year, compared to -24. 4% for Tetra Tech, Inc.. Over a 3-year CAGR, TTEK leads at 24. 3% annualised revenue growth. Higher growth typically commands a higher valuation multiple — check whether the premium P/E or P/S is justified by the growth rate using the PEG ratio.

Tetra Tech, Inc.

(TTEK) is the more profitable company, earning 4. 6% net margin versus 3. 5% for Aecom — meaning it keeps 4. 6% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: TTEK leads at 11. 1% versus 6. 4% for ACM. At the gross margin level — before operating expenses — TTEK leads at 17. 7%, reflecting greater pricing power or product mix advantage. Stronger margins indicate durable pricing power, lower cost of revenue, or higher mix of software/services. They are one of the clearest signs of business quality.

On forward earnings alone, Aecom (ACM) trades at 14.

2x forward P/E versus 20. 3x for Tetra Tech, Inc. — 6. 1x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for ACM: 49. 7% to $125. 63.

All stocks in this comparison pay dividends.

Aecom (ACM) offers the highest yield at 1. 2%, versus 0. 8% for Tetra Tech, Inc. (TTEK).

For long-horizon retirement investors, Tetra Tech, Inc.

(TTEK) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β 0. 53), 0. 8% yield, +451. 8% 10Y return). Both have compounded well over 10 years (TTEK: +451. 8%, ACM: +172. 9%), confirming both are viable long-term holds — but the lower-volatility option typically results in less emotional selling during corrections. Retirement portfolios generally favour predictability over maximum returns. Consult a financial advisor before making allocation decisions.

Both stocks operate in the Industrials sector, making this a peer-level intra-sector comparison — the same macro tailwinds and headwinds will affect both.

These fundamental differences mean investors should not choose between them on a single metric — the "better stock" depends entirely on which of these characteristics aligns with your investment strategy.