Eighteen different people have filed open market transactions 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. His file shows 698 sale transactions and zero purchases, worth $346,570,360, with activity carrying through to October 2nd, 2026.

Across the full roster, open market sales in the window total $424.0 million. For scale, Vicor last traded at $262.32 and carries a market capitalization of $12,094,717,952. Only Form 4 codes P and S are counted here, so awards, tax withholding and option exercises are excluded from every figure below.

Working down the roster in order: Patrizio Vinciarelli, CEO, 0 buys and 698 sells for $346,570,360. Claudio Tuozzolo, Director, 0 buys and 28 sells for $13,717,507. James F Schmidt, CFO, 0 buys and 61 sells for $8,705,355. Philip D Davies, Director, 0 buys and 77 sells for $8,061,360.

Michael McNamara, Director, filed 0 buys and 7 sells for $7,545,437. Estia J Eichten, Director, filed 0 buys and 14 sells for $7,347,898. Andrew D'Amico, CFO, filed 0 buys and 59 sells for $6,030,155. Two people on the file carry the CFO role in this window, which is what the filings show.

Rounding out the ten largest by dollars transacted: Alvaro Doyle, listed as Other, 0 buys and 11 sells for $5,298,475. Quentin A. Fendelet, listed as Other, 0 buys and 24 sells for $5,193,131. Sean Crilly, listed as Other, 0 buys and 6 sells for $3,263,725.

The pattern across those ten names is uniform. Every one of them is a seller in the window, and none of them recorded an open market purchase. The spread of transaction counts is wide, from 6 at the low end to 698 at the top, which is the difference between a handful of discrete dispositions and sustained, repeated selling across the year.

A roster like this tells you who filed and what direction they went. It does not tell you why. A director who files once may simply be exercising a long dormant plan or settling an estate matter, and a single filing is not a conviction signal in either direction. A large holder selling steadily may be diversifying a concentrated position, funding a tax bill, or working through a scheduled program, and a founder-operator with a very large stake will often sell on a schedule that has nothing to do with a near-term view of the business. Dollar totals also scale with the size of the holding, not with the strength of anyone's opinion, so the biggest number on the page usually belongs to the person who owned the most to begin with.

The other thing a one-year roster cannot show you is what came before it. A window of 365 days captures what it captures, and nothing about the ten names above speaks to purchases or sales that fell outside it.

Sources: SEC Form 4 filings via EDGAR, reviewed by InsiderBuying.com.

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