X0508 4 2025-12-10 0 0001589526 Blue Bird Corp BLBD 0001884757 Radulescu Razvan 3920 ARKWRIGHT ROAD SUITE 200 MACON GA 31210 0 1 0 0 Chief Financial Officer 1 Common Stock, par value $0.0001 2025-12-10 4 S 0 7984 50.39 D 49087 D The price reported in Column 4 is a weighted average price resulting from shares sold in multiple transactions on December 10, 2025, pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 12, 2025, at prices ranging from $50.01 to $50.99, inclusive. The reporting person undertakes to provide to Blue Bird Corporation, any security holder of Blue Bird Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote. /s/ Matthew Meziere as attorney-in-fact 2025-12-10