X0609 4 2026-08-19 0000949858 ACHIEVE LIFE SCIENCES, INC. ACHV 0001713369 Stewart Richard Alistair false 22722 29TH DR SE SUITE 100 BOTHELL WA 98021 true false false false false Common Stock 2026-08-19 4 S false 20626 8.493 D 208249 D Common Stock 359 I By Spouse Common Stock 882 I By Ricanto Limited The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $8.4536 to $8.52 per share, inclusive. The reporting person hereby undertakes to provide to the Issuer, any security holder of the issuer, 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 range set forth in this footnote. The reporting holder is the principal owner of Ricanto Limited. /s/ Sandra Thomson as attorney-in-fact 2026-08-21