X0609 4/A 2026-05-11 2026-05-13 0000884269 ALPHA PRO TECH LTD APT 0001347444 MONTGOMERY CHARLES D true 53 WELLINGTON STREET EAST AURORA A6 L4G 1H6 ONTARIO, CANADA true false false false 0 common stock 2026-05-11 4 S 0 3886 7.03 D 80281 D common stock 2026-05-12 4 S 0 5000 6.28 D 75281 D common stock 2026-05-12 4 S 0 5000 6.35 D 70281 D common stock 2026-05-12 4 S 0 5000 6.33 D 65281 D common stock 2026-05-12 4 S 0 5000 6.04 D 60281 D This amendment is being filed solely to reflect an administrative error in the reporting persons direct holdings, which inadvertently omitted the reporting persons unvested restricted stock units, on the May 13, 2026 filing. /s/ Charles Montgomery 2026-09-30