J vs TTEK: Which Is the Better Buy in 2026?

Same yardstick, side by side (as of September 2026). Valuation lined up like this is most meaningful for two names in the same corner of the market, which these are. Figures are approximate; verify before investing.

Reading it: J is the cheaper of the two on forward earnings, but cheaper is not the same as better. Pair the valuation with growth (how far the forward P/E sits below the trailing P/E) and risk (beta) before you decide.

The metrics above tell you which is the marginally better business. The bigger risk for most people is not picking the slightly worse stock, it is over-concentrating. J and TTEK share themes, so owning both, or adding either to what you already hold, can quietly push a large share of your portfolio into one bet.

This is the part a generic comparison page cannot answer, because it depends on what you own. Connect your brokerage and Walnut shows your real, combined J and TTEK exposure, flags overlap with your existing positions, and tells you if adding one would tip you past a concentration you are comfortable with, read-only by default, with your login staying at your broker. Walnut is not an investment adviser.

Jacobs Solutions Inc. (NYSE: J) is a Dallas-based professional services firm of roughly ~47,000 people that designs, plans and manages large physical assets: water and wastewater systems, highways and transit, semiconductor fabs, pharmaceutical plants, power and grid infrastructure, and increasingly data centers. It reports in two segments. Infrastructure & Advanced Facilities is the bulk of it, generating ~$3.75 billion of gross revenue in the June 2026 quarter, of which ~$2.09 billion was adjusted net revenue after stripping pass-through costs, at a segment operating margin near ~12.8%. PA Consulting, the UK-based strategy and innovation consultancy, is much smaller at ~$330 million of quarterly revenue but far richer, running near ~22% segment operating margin. Jacobs completed the purchase of the remaining PA Consulting shares on March 20, 2026 for aggregate initial consideration of about ~£1.21 billion, taking ownership from roughly 71% to full.

Full J guide

Tetra Tech provides consulting, engineering, program management, and construction management services focused on water, environment, and sustainable infrastructure, operating through its Government Services Group (GSG) and Commercial/International Services Group (CIG). Its clients span US federal, state, and local agencies plus commercial and international customers, and its expertise in water resources, environmental remediation, and data analytics has made it one of the leading pure-play firms in the space alongside AECOM, WSP, Jacobs, Stantec, and Arcadis.

Full TTEK guide

Both fit overlapping themes, but they are not interchangeable. The useful comparison is which set of drivers and risks you want exposure to.

• J drivers: Backlog is growing faster than revenue; The AI build-out has reached the engineering layer.
• TTEK drivers: Water and environmental infrastructure demand; Backlog and margin expansion.

A faster-growing, richer-valued name usually swings harder, so it suits a longer horizon and a higher tolerance for volatility; a steadier, more cash-generative business suits a more conservative or income-minded investor. The honest test is which set of risks you could hold through a drawdown: The headline growth rate is flattered by pass-through revenue, which nearly doubled the gap between gross and net revenue growth in the June quarter, so a mix shift toward construction-heavy work can inflate revenue while adding nothing to profit. For TTEK, the biggest risk is dependence on government spending, shown vividly when a USAID and State Department funding pause cut roughly $200 million in one quarter and hundreds of millions in annualized revenue.

Growth-minded investors who believe the theme has years to run tend to accept the richer multiple for more upside; value-minded investors lean toward the cheaper forward earnings and steadier profile. Pick J if you believe its drivers more; TTEK if you believe its. Many investors hold both, but since they share themes, that is a concentrated bet, not diversification. Decide deliberately and check overlap. For the full detail, see the J and TTEK guides.

J. At about ~$145 a share the market capitalization is roughly ~$16.9 billion, which is close to ~20 times the midpoint of guided adjusted EPS and near ~48 times trailing GAAP EPS. That spread is not an accounting curiosity: it reflects ~$402.9 million of restructuring and transaction charges booked in the first nine months of fiscal 2026, ~$105.5 million of intangible amortization, and a temporarily elevated tax rate from the PA Consulting purchase. Adjusted EBITDA guidance of ~14.7% to ~14.8% on adjusted net revenue implies roughly ~$1.4 billion, putting enterprise value near ~14 times that figure.

TTEK. TTEK trades at a forward P/E in the low-20s, a premium that reflects its specialized positioning and steady margin gains but is roughly in line with the broader commercial-services group. Several valuation models flag the stock as trading below estimated fair value, though such estimates depend heavily on growth assumptions. The company raised fiscal 2026 guidance after beating second-quarter estimates.

Headline figures (approximate, August 2026): J shows revenue (ttm, gross) ~$14.2B, adjusted net revenue (9m fy2026) ~$7.0B, FY guide ~9.5% to 10% growth, adjusted eps (fy2026 guidance) ~$7.20 to ~$7.30, gaap eps (ttm) ~$2.86; TTEK shows revenue (fy2025) ~$4.6B, net revenue guidance (fy2026) ~$4.25B to $4.4B, adjusted eps guidance (fy2026) ~$1.50 to $1.58, backlog (q2 fy2026) ~$4.28B.

J and TTEK are related but distinct: same themes, different businesses and risks. Neither wins in the abstract; the right pick is whichever thesis you actually believe, sized so you are not over-concentrated in one theme. Walnut can show your combined J and TTEK exposure against your real portfolio. It is not an investment adviser.