Advanced Drainage Systems acquires StormTrap for $530M

Advanced Drainage Systems (WMS) entered into a definitive agreement on October 1, 2026 to acquire StormTrap Investments for approximately $530 million ($450 million after tax adjustments), funded by cash on hand and existing credit facilities. This is a material acquisition adding scale in engineered stormwater solutions, but size relative to WMS's market cap and execution risk (antitrust approvals required) warrant a moderately strong rather than very high impact score.

Advanced Drainage Systems announced it will buy StormTrap, a stormwater solutions company, for around $530 million. The deal adds a new product line and is funded from cash and existing credit.