Willdan vs. Tetra Tech: Which Infrastructure Stock Has More Upside?

Core Insights - The infrastructure consulting sector is being transformed by electrification, AI-driven data center growth, water scarcity, and defense modernization, with Willdan Group, Inc. (WLDN) and Tetra Tech, Inc. (TTEK) positioned to capitalize on these trends [1][2] Company Overview Willdan Group, Inc. (WLDN) - Willdan is increasingly focused on U.S. electricity load growth, grid modernization, and municipal advisory services, with 85% of its revenue coming from its Energy segment [2][10] - In Q3 2025, Willdan reported a 15% increase in revenue to $182 million and a 65.8% rise in adjusted EPS to $1.21, driven by demand for electrification [8][9] - The company has raised its 2025 financial targets to net revenue of $360–$365 million and adjusted EPS of $4.10–$4.20, reflecting confidence in ongoing momentum [12] Tetra Tech, Inc. (TTEK) - Tetra Tech is a global leader in water, environmental, and defense consulting, with a diversified international base and a focus on high-margin consulting [2][18] - In Q1 fiscal 2026, Tetra Tech achieved net revenue of $1.04 billion, with adjusted EPS rising 17% year over year to $0.35 [18] - The company raised its fiscal 2026 guidance to net revenue of $4.15–$4.30 billion and adjusted EPS of $1.46–$1.56, supported by a backlog of $3.95 billion [18][19] Market Performance - WLDN has seen a 238% increase in stock price over the past year, reflecting strong investor enthusiasm for electrification, while TTEK's stock has gained 11% [4][21] - Willdan trades at a premium valuation of 24.68X forward earnings compared to Tetra Tech's 20.65X, but Tetra Tech benefits from positive earnings revisions [6][21] Strategic Positioning - Willdan's recent acquisition of Compass Municipal Advisors enhances its municipal financial consulting capabilities, allowing it to support local governments with both engineering and financing strategies [11] - Tetra Tech's strategic focus on front-end advisory and high-margin consulting, along with recent contract wins in defense and environmental sectors, strengthens its market position [20] Growth Outlook - Willdan's organic growth is driven by electricity load expansion and data center investments, but its high valuation may limit future upside [24] - Tetra Tech's diversified exposure to water and defense sectors provides more stable growth drivers, with improving earnings revisions and a favorable valuation profile [25][26]