X0609 4 2026-10-18 0 0001301787 BlueLinx Holdings Inc. BXC 0001921260 DeBrock Kimberly Ann false 1950 SPECTRUM CIRCLE MARIETTA GA 30067 0 1 0 0 VP & Chief Accounting Officer 0 Common Stock 2026-10-18 4 M 0 232 A 1318 D Common Stock 2026-10-18 4 F 0 69 73.62 D 1249 D Restricted Stock Units 2026-10-18 4 M 0 232 0 D Common Stock 232 0 D Restricted Stock Units Common Stock 1280 1280 D Restricted Stock Units Common Stock 214 214 D Restricted Stock Units Common Stock 2650 2650 D Restricted Stock Units Common Stock 349 349 D Represents the conversion of restricted stock units that vested on October 18, 2026. These are time based restricted stock units that vest in three equal annual installments, with the first vesting on October 18, 2024. Each restricted stock unit represents a contingent right to receive one share of BlueLinx Holdings Inc. common stock. These shares were withheld to cover tax withholding obligations when 69 time-based restricted stock units vested on October 18, 2026. These are time-based restricted stock units that vest in three equal installments commencing on June 6, 2026. Vested shares will be delivered to the reporting person no later than 30 days after each vesting date. These are time-based restricted stock units that vest in three equal installments commencing on June 7, 2025. Vested shares will be delivered to the reporting person no later than 30 days after each vesting date. These are time-based restricted stock units that vest in three equal installments commencing on June 7, 2027. Vested shares will be delivered to the reporting person no later than 30 days after each vesting date. These are time-based restricted stock units that vest on June 6, 2028. Vested shares will be delivered to the reporting person no later than 30 days after each vesting date. /s/ Christin Lumpkin, as attorney-in-fact for Kimberly Ann DeBrock 2026-10-20