Eighteen different people have open-market Form 4 activity on file at Vicor Corp (VICR) over the trailing 365 days. The most active name on that list is Patrizio Vinciarelli, the company's CEO, whose most recent filed transaction carries a date of October 2nd, 2026. Across the full roster, the open-market dollar flow in the window comes to $414.1 million, all of it on the sell side. Shares were last at $176.04.

Vinciarelli's own line is the one that sets the scale. He records zero purchases and 698 sales in the window, worth $346,570,360. That single line is the bulk of everything the roster shows, and it is the reason the company's twelve-month insider picture reads the way it does.

Below him, Claudio Tuozzolo, a Director, filed 21 sales totaling $11,874,093 and no purchases. Michael McNamara, also a Director, filed 7 sales totaling $7,545,437. James F Schmidt, listed in the role of CFO, filed 51 sales totaling $7,511,865, again with no buys recorded.

Estia J Eichten, a Director, filed 12 sales worth $6,841,137. Philip D Davies, a Director, filed the second-highest sale count on the board side at 75 transactions, worth $6,610,065. The gap between Davies and Tuozzolo shows how little a raw transaction count says about dollar size: more filings, smaller total.

Alvaro Doyle, categorized in the filings as Other, recorded 9 sales worth $4,606,207. Andrew D'Amico, in the role of CFO, recorded 42 sales worth $4,503,725. Quentin A. Fendelet, listed as Other, recorded 19 sales worth $3,730,741, and Sean Crilly, also listed as Other, recorded 6 sales worth $3,263,725.

Those ten names are the most visible part of a group of 18 people with filings in the window. Only Form 4 codes P and S are counted here. Awards, tax withholding and option exercises are excluded, so what remains is discretionary open-market activity rather than compensation mechanics passing through the same filings.

A roster like this one is a map of who files, not a verdict on what any of them think. A director who appears once in a year is a single data point and not a conviction signal, and a large holder selling may be diversifying, funding a tax bill, settling an estate matter, or working through a pre-arranged plan that was set months before the trade printed. Concentration matters too: when one person is responsible for most of the dollar volume, the roster describes that person's circumstances far more than it describes the company. Nothing in a Form 4 explains motive, and this desk does not guess at it.

What the filings do give you is scale, direction and timing, and at Vicor all three point the same way over this window. Figures come from SEC Form 4 filings submitted through EDGAR and reviewed by InsiderBuying.com.

Track every Form 4 filed at VICOR CORP (VICR) → insiderbuying.com/companies/VICR