X0508 4 2025-12-02 0 0001589526 Blue Bird Corp BLBD 0001929771 Scartz Ted 3920 ARKWRIGHT ROAD SUITE 200 MACON GA 31210 0 1 0 0 SVP General Counsel 0 Common Stock, par value $0.0001 per share 2025-12-02 4 F 0 820 50.70 D 47949 D Common Stock, par value $0.0001 per share 2025-12-02 4 A 0 5387 0 A 53336 D Common Stock, par value $0.0001 per share 2025-12-02 4 A 0 8081 0 A 61417 D This transaction represents shares withheld to satisfy payroll tax withholding obligations related to restricted stock units that vested on December 2, 2025. The award represents a grant of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the common stock of Blue Bird Corporation. The RSUs vest in three approximately equal tranches on each of December 1, 2026, December 1, 2027, and December 1, 2028. The RSUs vest on December 1, 2028, subject to downward adjustment based upon the actual percentage payout of the management performance bonus award for the Company's fiscal year ending September 30, 2028. /s/ Matthew Meziere as attorney-in-fact 2025-12-04