X0609 4 2026-08-13 0001842731 SIMILARWEB LTD. SMWB 0001910424 Offer Or true 87 HAZOREA ST. KFAR SHMARYAHU L3 ISRAEL 0 1 0 0 Chief Executive Officer 0 Ordinary Shares 2026-08-13 4 M 0 228500 3.04 A 4972896 D Ordinary Shares 2026-08-13 4 S 0 228500 8.8215 D 4744396 D Ordinary Shares 2026-08-13 4 M 0 200000 0.4 A 4944396 D Ordinary Shares 2026-08-13 4 S 0 200000 8.7864 D 4744396 D Ordinary Shares 2026-08-13 4 S 0 106105 8.75 D 4638291 D Ordinary Shares 2026-08-13 4 S 0 40000 8.9 D 4598291 D Ordinary Shares 2026-08-14 4 M 0 59992 3.04 A 4658283 D Ordinary Shares 2026-08-14 4 S 0 59992 8.9006 D 4598291 D Ordinary Shares 2026-08-14 4 M 0 75000 0.4 A 4673291 D Ordinary Shares 2026-08-14 4 S 0 75000 8.852 D 4598291 D Options to purchase one Ordinary Share 3.04 2026-08-13 4 M 0 228500 0 D 2022-01-29 2031-01-28 Ordinary shares 228500 200000 D Options to purchase one Ordinary Share 0.4 2026-08-13 4 M 0 200000 0 D 2015-02-14 2028-02-14 Ordinary shares 200000 814000 D Options to purchase one Ordinary Share 3.04 2026-08-14 4 M 0 59992 0 D 2022-01-29 2031-01-28 Ordinary shares 59992 140008 D Options to purchase one Ordinary Share 0.4 2026-08-14 4 M 0 75000 0 D 2015-02-14 2028-02-14 Ordinary shares 75000 739000 D The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $8.66 to $9.005. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $8.69 to $8.88. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $8.90 to $8.92. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $8.85 to $8.87. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request The options reported herein were exercised and the underlying shares were sold on the same date as reported in Table I. The shares were acquired upon the exercise of stock options /s/ Meirav Shemesh on behalf of Oppenheimer Israel, as Attorney-in-fact 2026-08-17