Similarweb Ltd. (SMWB) Institutional Ownership

Ownership Summary

Similarweb Ltd. (NYSE:SMWB) currently has 8 active institutional owners and shareholders as of today (December 2025), that have filed 13F forms with the Securities Exchange Commission (SEC).

• These investors collectively held 5.7% of the company's total shares outstanding in December 2025, down from 53.1% in September 2025.
• In percentage terms, this reflects as a holdings change of 4.79% quarter on quarter, and a decrease of 92.86% year over year.
• The latest 13F cycle for Similarweb reveals that of 8 total investors, 3 funds grew their exposure, whereas 1 reduced theirs and 4 made no changes.
• The total number of shares held by institutions in Similarweb increased to 4.91Mn as of December 2025, a net change of up by 224.23K shares quarter on quarter, and down 36.36Mn shares year over year.
• With 3.11Mn shares, Migdal Insurance & Financial Holdings Ltd. commands the largest institutional position in Similarweb as of December 31, 2025, equating to 3.59% of the company.
• Among the most significant buyers of Similarweb during December 2025 were UBS Group AG (223.56K), Zurcher Kantonalbank (Zurich Cantonalbank) (10.56K), TEACHER RETIREMENT SYSTEM OF TEXAS (1.61K).
• Leading sellers of Similarweb stock in December 2025 included Y.D. More Investments Ltd (11.50K).
• The top 8 institutional holders of Similarweb for the quarter ending December 2025 included Migdal Insurance & Financial Holdings Ltd. (3.11Mn), Y.D. More Investments Ltd (1.17Mn), UBS Group AG (536.55K), VANGUARD GROUP INC (35.29K), Zurcher Kantonalbank (Zurich Cantonalbank) (31.59K), TEACHER RETIREMENT SYSTEM OF TEXAS (18.02K), KLP KAPITALFORVALTNING AS (8.10K), Crewe Advisors LLC (734).