Eighteen different people have filed Form 4s at VICOR CORP (VICR) over the trailing 365 days. The most active of them by a wide margin is Patrizio Vinciarelli, the company's CEO, who accounts for 697 open market sales worth $345,568,560. His most recent transaction on file carries a date of November 2nd, 2026.

Across the whole roster, the open market dollar figure on file is $410.4 million, and all of it sits on the sell side. Not one person in the top ten recorded a purchase during the window. Only Form 4 codes P and S are counted here, so awards, tax withholding and option exercises are excluded from those totals.

Behind Vinciarelli, the next name on the roster is Claudio Tuozzolo, a Director, with 16 sales totaling $11,268,403. Michael McNamara, also a Director, filed 7 sales worth $7,545,437. James F Schmidt, listed as CFO, recorded 51 sales totaling $7,511,865.

Philip D Davies, a Director, is the second most frequent filer on the list by transaction count, with 87 sales worth $7,173,230. Estia J Eichten, a Director, filed 12 sales totaling $6,841,137. Alvaro Doyle, whose role is listed as Other, recorded 9 sales worth $4,606,207.

Andrew D'Amico, also listed as CFO, filed 39 sales totaling $4,314,579. Quentin A. Fendelet, listed as Other, recorded 19 sales worth $3,730,741. Rounding out the ten is Sean Crilly, listed as Other, with 5 sales worth $2,188,405.

Vicor designs and manufactures power conversion components and is classified under Electronic Components, NEC. The stock last traded at $159.05, against a market capitalization of $7,339,934,720. That context matters when reading the dollar totals above, because a large sale at a company of this size is a different event than the same dollar figure at a smaller issuer.

The pattern worth noting is the concentration. Vinciarelli's $345,568,560 dwarfs the rest of the roster combined, and the other nine names range from a single-digit number of filings to Davies at 87. Two people on the list carry the CFO title, which is what the filings themselves show, and three of the top six are Directors.

A roster like this tells you who filed and what they filed. It does not tell you why. A Director who appears once in a year is not making a conviction statement with that filing, and a large holder selling may be diversifying, funding a tax obligation, meeting a pre-arranged schedule or simply managing a position that grew outsized over decades. Founders and long-tenured executives in particular often run structured sales for reasons that have nothing to do with their view of the business. The absence of purchases across all eighteen filers is a fact about the record, not a forecast.

Figures are drawn from SEC Form 4 filings submitted through EDGAR and reviewed by InsiderBuying.com, covering the 365 day window ending with the November 2nd, 2026 transaction date.

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