Advanced Drainage Systems delivered strong Q4 FY2026 revenue and adjusted EPS beats, yet shares remain under pressure and valuation is approaching attractive levels. WMS's growth was fueled by the National Diversified Sales acquisition, with Stormwater and Wastewater segments both posting double-digit product line gains and rising segment profits. Despite robust operational performance, reported EPS fell due to one-time charges; adjusted EPS and net income rose, and management guides for continued revenue and EBITDA growth in FY2027.