X0306 4 2021-12-27 0001423221 Quanex Building Products CORP NX 0001238361 LIPPERT JASON 1800 W LOOP SOUTH SUITE 1500 HOUSTON TX 77027 1 Common Stock 2021-12-27 4 P 0 3447 24.5258 A 13447 D Common Stock 2021-12-28 4 P 0 7003 25.5359 A 20450 D The price reported in Column 4 is an average price. These shares were purchased in multiple transactions at prices ranging from $24.51 to $24.53, inclusive. The reporting person undertakes to provide to NX, any security holder of NX, or the staff of the SEC, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote. The price reported in Column 4 is an average price. These shares were purchased in multiple transactions at prices ranging from $25.46 to $25.55, inclusive. The reporting person undertakes to provide to NX, any security holder of NX, or the staff of the SEC, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote. /s/ Paul B. Cornett, Power of Attorney 2021-12-29