US Environmental Infrastructure Stocks Lose $500 Billion in Market Value in One Day

Tetra Tech Inc. (NASDAQ: TTEK) closed at $30 on the Nasdaq on the 17th, down 5.15% from the previous day.

Trading volume exceeded 1.45 million shares, and its market capitalization—about $7.8 billion (roughly KRW 10 trillion)—evaporated by approximately $380 million (around KRW 500 billion) in a single day.

Recently, Tetra Tech secured a series of U.S. defense contracts, including a five-year, $100 million environmental services contract with the U.S. Air Force Civil Engineer Center (about KRW 130 billion), followed by a $99 million engineering services contract for the U.S. Navy and a $14 million IT/OT support contract for the Defense Logistics Agency. ()

In its first quarter of fiscal 2026, the company reported robust growth and raised its full-year guidance, but its share price has undergone a short-term correction amid heightened volatility. ()

Headquartered in Pasadena, California, Tetra Tech is a consulting and engineering firm specializing in environmental services, water resources, and sustainable infrastructure. It generates approximately $5 billion in annual revenue and employs around 25,000 people. ()

Since its founding in 1966, the company has provided high-value technical services—such as water resource management, environmental impact assessments, and infrastructure design—to U.S. federal and state governments, overseas public agencies, and energy and utility firms, establishing itself as a leading beneficiary of U.S. government infrastructure and environmental projects. ()