STN vs TTEK vs EXPO vs PRIM vs PWR

For growth investors, Quanta Services, Inc.

(PWR) is the stronger pick with 19. 8% revenue growth year-over-year, versus 4. 2% for Exponent, Inc. (EXPO). Primoris Services Corporation (PRIM) offers the better valuation at 21. 5x trailing P/E (18. 1x forward), making it the more compelling value choice. Analysts rate Exponent, Inc. (EXPO) a "Buy" — based on 8 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, Primoris Services Corporation (PRIM) is the cheapest at 21.

5x versus Quanta Services, Inc. at 110. 4x. On forward P/E, Primoris Services Corporation is actually cheaper at 18. 1x. The PEG ratio (P/E divided by earnings growth rate) is the most growth-adjusted single valuation metric: Primoris Services Corporation wins at 0. 98x versus Exponent, Inc. 's 5. 18x — a PEG below 1. 0 traditionally signals the market is underpricing earnings growth.

Over the past 5 years, Quanta Services, Inc.

(PWR) delivered a total return of +651. 1%, compared to -28. 5% for Exponent, Inc. (EXPO). Over 10 years, the gap is even starker: PWR returned +31. 4% versus EXPO's +186. 1%. 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 Primoris Services Corporation's 1. 83β — meaning PRIM is approximately 243% more volatile than TTEK relative to the S&P 500. On balance sheet safety, Quanta Services, Inc. (PWR) carries a lower debt/equity ratio of 13% versus 76% for Primoris Services Corporation — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), Quanta Services, Inc.

(PWR) is pulling ahead at 19. 8% versus 4. 2% for Exponent, Inc. (EXPO). On earnings-per-share growth, the picture is similar: Primoris Services Corporation grew EPS 51. 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.

Exponent, Inc.

(EXPO) is the more profitable company, earning 18. 2% net margin versus 3. 6% for Quanta Services, Inc. — meaning it keeps 18. 2% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: EXPO leads at 20. 6% versus 5. 5% for PRIM. At the gross margin level — before operating expenses — STN leads at 42. 6%, 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.

The PEG ratio (forward P/E divided by expected earnings growth rate) is the most precise measure of undervaluation relative to growth potential.

By this metric, Primoris Services Corporation (PRIM) is the more undervalued stock at a PEG of 0. 98x versus Exponent, Inc. 's 5. 18x. A PEG below 1. 0 is traditionally considered the threshold for growth-adjusted undervaluation. On forward earnings alone, Primoris Services Corporation (PRIM) trades at 18. 1x forward P/E versus 57. 4x for Quanta Services, Inc. — 39. 3x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for PRIM: 48. 7% to $160. 63.

In this comparison, EXPO (1.

9% yield), TTEK (0. 8% yield), STN (0. 7% yield), PRIM (0. 3% yield) pay a dividend. PWR does not pay a meaningful dividend and should not be held primarily for income.

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, +450. 1% 10Y return). Primoris Services Corporation (PRIM) carries a higher beta of 1. 83 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (TTEK: +450. 1%, PRIM: +402. 0%), 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.

In terms of investment character: STN is a mid-cap high-growth stock; TTEK is a small-cap quality compounder stock; EXPO is a small-cap quality compounder stock; PRIM is a small-cap high-growth stock; PWR is a mid-cap high-growth stock. STN, TTEK, EXPO pay a dividend while PRIM, PWR do not, making them suitable for different income and tax situations. 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.