X0609 4 2026-06-01 0 0000751978 VICOR CORP vicr 0001512868 Davies Philip D false 25 FRONTAGE RD. ANDOVER MA 01810 1 1 0 0 VP Global Sales & Marketing 1 Common Stock 2026-06-01 4 M 0 3072 30.98 A 4992 D Common Stock 2026-06-01 4 S 0 300 314.1133 D 4692 D Common Stock 2026-06-01 4 S 0 283 314.9376 D 4409 D Common Stock 2026-06-01 4 S 0 200 316.265 D 4209 D Common Stock 2026-06-01 4 S 0 17 317.8476 D 4192 D Common Stock 2026-06-01 4 S 0 500 319.02 D 3692 D Common Stock 2026-06-01 4 S 0 200 321.925 D 3492 D Common Stock 2026-06-01 4 S 0 400 323.445 D 3092 D Common Stock 2026-06-01 4 S 0 600 325.1817 D 2492 D Common Stock 2026-06-01 4 S 0 100 326.93 D 2392 D Common Stock 2026-06-01 4 S 0 372 328.4811 D 2020 D Common Stock 2026-06-01 4 S 0 100 329.52 D 1920 D Non Qualified Stock Option 30.98 2026-06-01 4 M 0 3072 0 D 2029-09-06 Common Stock 3072 2394 D This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 21, 2025. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $313.6500 to $314.6400. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $314.8000 to $315.2100. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $316.0000 to $316.5300. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $317.1700 to $318.1300. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $318.5600 to $319.5200. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $321.6900 to $322.1600. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $323.2100 to $323.5500. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $324.6100 to $325.5300. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $326.9300 to $326.9300. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $328.1700 to $328.8800. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $329.5200 to $329.5200. Options granted on 9/6/2019 and vest over five years. /s/Quentin A. Fendelet Attorney in fact for Philip D. Davies 2026-06-02