Insider buying on May 15, 2026

On May 15, 2026, 76 insiders at 56 companies filed 148 purchases reported on Form 4, worth $55.7M in all, with a median purchase of $50.2K. The largest was Duggan Robert W, Director, 10% owner of Pulse Biosciences, Inc. (PLSE), who reported buying 660,233 shares worth $13.0M. Officers accounted for 40 purchases, directors who are not officers for 66, and 10% owners with no board or officer role for 39. Chief executives and chief financial officers filed 25 purchases: Allemann David Michael, Executive Officer & Co-CEO, Director of On Holding AG (ONON); Coppetti Caspar Felix, Executive Officer & Co-CEO, Director of On Holding AG (ONON); Baum Mark L, CHIEF EXECUTIVE OFFICER, Director of Harrow, Inc. (HROW) among others. 26 companies showed cluster buying, two or more insiders buying within 7 days, among them XRN (9 insiders), VITL (9 insiders), HDSN (7 insiders), OI (5 insiders). For 30 insiders of 76, this was the first purchase of that company's stock on our record. That is more than the 126 purchases filed on May 14, 2026. A Form 4 is due within two business days of the trade, so most of these purchases were made earlier in the week. Code P also covers shares bought privately from the company, so one large figure can be a negotiated placement rather than buying on the exchange.