144 0001830195 XXXXXXXX LIVE 0000751978 VICOR CORPORATION 000-18277 25 Frontage Road Andover MA 01810 9784702900 ANDREW DAMICO Director Common Morgan Stanley Smith Barney LLC Executive Financial Services

1 New York Plaza 8th Floor New York NY 10004

11378 3112224.34 33646426 04/27/2026 NASDAQ Common 04/27/2026 Exercise of Stock Options Issuer N 11378 04/27/2026 Cash Y The securities to be sold were and will be received upon the exercise of stock options over the next three months. The dates of acquisition and payment were and will be the dates of exercise/sale. 04/27/2026 09/12/2024 /s/ Andrew D'Amico