CECO Environmental (CECO) Drops 8.9% as Approved Equity Plan Fuels Dilution Fears

Shares of CECO Environmental (NASDAQ:CECO) tumbled 8.9% on May 29, 2026, after shareholders approved a merger with Thermon Group Holdings and a new equity plan authorizing up to 3.35 million additional shares. The potential dilution from the stock issuance drove the sell-off, overshadowing the strategic combination. Over 99% of votes favored the Thermon merger, expected to close around June 1, 2026. However, the concurrent equity plan raised concerns that existing shareholder value will be eroded. The stock has experienced 30 moves greater than 5% in the past year, indicating high volatility. Despite the drop, CECO remains up 31.1% year-to-date at $78.41, but trades 12.8% below its 52-week high of $89.87 reached earlier in May 2026.