Environmental engineering firm Tetra Tech (NASDAQ: TTEK) reported revenue ahead of Wall Street’s expectations in Q1 CY2026, with sales up 10.6% year on year to $1.22 billion. Guidance for next quarter’s revenue was optimistic at $1.08 billion at the midpoint, 2.1% above analysts’ estimates. Its GAAP profit of $0.36 per share was 11.3% above analysts’ consensus estimates.

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Company Overview

With a 50-year legacy of "Leading with Science" and operations on all seven continents, Tetra Tech (NASDAQ: TTEK) provides high-end consulting and engineering services focused on water management, environmental solutions, and sustainable infrastructure for government and commercial clients worldwide.

Revenue Growth

A company’s long-term sales performance can indicate its overall quality. Any business can put up a good quarter or two, but many enduring ones grow for years.

With $4.57 billion in revenue over the past 12 months, Tetra Tech is one of the larger companies in the business services industry and benefits from a well-known brand that influences purchasing decisions.

As you can see below, Tetra Tech’s 14.2% annualized revenue growth over the last five years was exceptional. This is a great starting point for our analysis because it shows Tetra Tech’s demand was higher than many business services companies.

We at StockStory place the most emphasis on long-term growth, but within business services, a half-decade historical view may miss recent innovations or disruptive industry trends. Tetra Tech’s annualized revenue growth of 5.5% over the last two years is below its five-year trend, but we still think the results were respectable.

This quarter, Tetra Tech reported year-on-year revenue growth of 10.6%, and its $1.22 billion of revenue exceeded Wall Street’s estimates by 21.8%. Company management is currently guiding for a 6.8% year-on-year decline in sales next quarter.

Looking further ahead, sell-side analysts expect revenue to decline by 4.2% over the next 12 months, a deceleration versus the last two years. This projection is underwhelming and indicates its products and services will see some demand headwinds. At least the company is tracking well in other measures of financial health.

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Adjusted Operating Margin

Tetra Tech has done a decent job managing its cost base over the last five years. The company has produced an average adjusted operating margin of 11.9%, higher than the broader business services sector.

Analyzing the trend in its profitability, Tetra Tech’s adjusted operating margin rose by 1.9 percentage points over the last five years, as its sales growth gave it operating leverage.

In Q1, Tetra Tech generated an adjusted operating margin profit margin of 10.8%, down 1 percentage points year on year. This reduction is quite minuscule and indicates the company’s overall cost structure has been relatively stable.

Earnings Per Share

We track the long-term change in earnings per share (EPS) for the same reason as long-term revenue growth. Compared to revenue, however, EPS highlights whether a company’s growth is profitable.

Tetra Tech’s EPS grew at 19.4% compounded annual growth rate over the last five years, higher than its 14.2% annualized revenue growth. This tells us the company became more profitable on a per-share basis as it expanded.

We can take a deeper look into Tetra Tech’s earnings quality to better understand the drivers of its performance. As we mentioned earlier, Tetra Tech’s adjusted operating margin declined this quarter but expanded by 1.9 percentage points over the last five years. Its share count also shrank by 4.3%, and these factors together are positive signs for shareholders because improving profitability and share buybacks turbocharge EPS growth relative to revenue growth.

Like with revenue, we analyze EPS over a more recent period because it can provide insight into an emerging theme or development for the business.

For Tetra Tech, its two-year annual EPS growth of 30.2% was higher than its five-year trend. We love it when earnings growth accelerates, especially when it accelerates off an already high base.

In Q1, Tetra Tech reported EPS of $0.36, up from $0.02 in the same quarter last year. This print easily cleared analysts’ estimates, and shareholders should be content with the results. Over the next 12 months, Wall Street expects Tetra Tech’s full-year EPS of $1.67 to shrink by 4%.

Key Takeaways from Tetra Tech’s Q1 Results

We were impressed by how significantly Tetra Tech blew past analysts’ revenue expectations this quarter. We were also glad its revenue guidance for next quarter exceeded Wall Street’s estimates. On the other hand, its full-year EPS guidance missed and its EPS guidance for next quarter fell short of Wall Street’s estimates. Overall, this print was mixed but still had some key positives. The stock traded up 7.3% to $34.15 immediately following the results.

Indeed, Tetra Tech had a rock-solid quarterly earnings result, but is this stock a good investment here? When making that decision, it’s important to consider its valuation, business qualities, as well as what has happened in the latest quarter. We cover that in our actionable full research report which you can read here (it’s free).