X0609 4 2026-06-25 0000751978 VICOR CORP VICR 0001866281 Schmidt James F false 25 FRONTAGE ROAD ANDOVER MA 01810 true true false false CFO, Treasurer, Secretary true Common Stock 2026-06-25 4 M false 1000 100 A 1000 D Common Stock 2026-06-25 4 S false 150 327.1867 D 850 D Common Stock 2026-06-25 4 S false 200 328.5275 D 650 D Common Stock 2026-06-25 4 S false 79 330.0218 D 571 D Common Stock 2026-06-25 4 S false 110 330.9872 D 461 D Common Stock 2026-06-25 4 S false 50 331.84 D 411 D Common Stock 2026-06-25 4 S false 211 333.2205 D 200 D Common Stock 2026-06-25 4 S false 100 334.855 D 100 D Common Stock 2026-06-25 4 S false 50 338.09 D 50 D Common Stock 2026-06-25 4 S false 50 342.51 D 0 D Non Qualified Stock Option 100.00 2026-06-25 4 M false 1000 0 D 2031-06-25 Common Stock 1000 0 D This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 10, 2025. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $326.7200 to $327.4600. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $328.2700 to $329.2000. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $329.6800 to $330.6400. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $330.7800 to $331.0700. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $331.840 to $331.8400. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $333.0500 to $333.9000. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $334.5100 to $335.2000. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $338.0900 to $338.0900. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $342.5100 to $342.5100. Granted under the Companys Amended and Restated 2000 Stock Option and Incentive Plan on June 25, 2021 and vest over a five year period. /s/Quentin A. Fendelet Attorney in Fact for James F. Schmidt 2026-06-29