Why Is Similarweb ( $SMWB ) Stock Down -12.47% Today? (Find out why any stock moved today on Tickeron.) Similarweb (SMWB) shares fell 12.47% in Thursday's session, dropping to $7.51 from a prior close of $8.58. The primary catalyst was the announcement that Michael Akkerman will succeed founder Or Offer as Chief Executive Officer, effective November 2, 2026. Secondary pressure came from a series of insider share sales by the departing CEO disclosed in recent SEC filings. $TWLO $DASH $TDC $CPAY $TBLA