Form 4 Filing for Kiril Kovachev

This filing details stock transactions by Kiril Kovachev, Chief Accounting Officer of CECO ENVIRONMENTAL CORP. On March 15, 2026, 380 shares were disposed of at $54.50 per share, resulting in 14854 shares remaining. On March 16, 2026, 1753 shares were acquired at no cost, increasing the total to 16607 shares. On March 17, 2026, an additional 346 shares were disposed of at $57.06 per share, leaving 16261 shares. Footnote F1 indicates shares were withheld for tax liabilities on restricted stock units, and footnote F2 notes the acquisition of 120 shares through an employee stock purchase plan.