A Form 4 filed with the SEC on September 16, 2026, discloses that SimilarWeb Ltd.'s Chief Executive Officer sold a combined 79,591 ordinary shares across two trading days under a pre-established Rule 10b5-1 plan.

Key Highlights

  • Reporting person: The filer is identified as "Offer Or," listed as Chief Executive Officer of SimilarWeb Ltd. (NYSE:SMWB).
  • First transaction: 52,900 ordinary shares were disposed of on September 14, 2026, at a weighted average price of $8.5378 per share, in multiple transactions ranging from $8.07 to $8.70.
  • Second transaction: 26,691 ordinary shares were disposed of on September 15, 2026, at a weighted average price of $8.5267 per share, in multiple transactions ranging from $8.32 to $8.70.
  • Remaining ownership: Following both sales, the reporting person directly beneficially owns 4,253,500 ordinary shares.
  • 10b5-1 plan: According to the filing, both sales were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 1st, 2026.

SimilarWeb CEO's Share Sales Under Pre-Planned Trading Program

According to the Form 4, the reporting person, identified as Offer Or in the capacity of Chief Executive Officer, sold ordinary shares of SimilarWeb Ltd. (NYSE:SMWB) on two consecutive trading days. The filing indicates both sales were "effectuated pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 1st, 2026." A Rule 10b5-1 plan allows insiders to pre-schedule securities transactions at a time when they are not in possession of material non-public information.

On September 14, 2026, the filing reports a disposal of 52,900 ordinary shares coded as a sale (S). The weighted average sale price was $8.5378, with individual transactions ranging from $8.07 to $8.70. Following that transaction, the CEO's direct beneficial ownership stood at 4,280,191 shares. On September 15, 2026, an additional 26,691 ordinary shares were sold at a weighted average price of $8.5267, with individual transactions ranging from $8.32 to $8.70. After this second sale, direct beneficial ownership was reported as 4,253,500 ordinary shares.

The filing notes that the weighted average prices are composites of multiple transactions at different prices, and that the reporting person "undertakes to provide full information regarding the number of shares sold at each separate price upon request." No derivative securities transactions were reported. The Form 4 was signed by Meirav Shemesh on behalf of Oppenheimer Israel, as attorney-in-fact, and dated September 16, 2026.

What Was Disclosed

The filing discloses two open-market sales of SimilarWeb Ltd. ordinary shares by the company's CEO totaling 79,591 shares across September 14-15, 2026, both executed under a pre-adopted Rule 10b5-1 trading plan, leaving the CEO with direct beneficial ownership of 4,253,500 shares.