X0508 4 2026-03-05 0 0000751978 VICOR CORP vicr 0001512868 Davies Philip D 25 FRONTAGE RD. ANDOVER MA 01810 1 1 0 0 VP Global Sales & Marketing 1 Common Stock 2026-03-05 4 M 0 1920 41.61 A 3840 D Common Stock 2026-03-05 4 M 0 2585 60.61 A 6425 D Common Stock 2026-03-05 4 M 0 914 75.43 A 7339 D Common Stock 2026-03-05 4 S 0 100 177.18 D 7239 D Common Stock 2026-03-05 4 S 0 700 179.3814 D 6539 D Common Stock 2026-03-05 4 S 0 607 180.2373 D 5932 D Common Stock 2026-03-05 4 S 0 698 181.4881 D 5234 D Common Stock 2026-03-05 4 S 0 100 182.17 D 5134 D Common Stock 2026-03-05 4 S 0 100 185.51 D 5034 D Common Stock 2026-03-05 4 S 0 300 187.2567 D 4734 D Common Stock 2026-03-05 4 S 0 300 189.2067 D 4434 D Common Stock 2026-03-05 4 S 0 300 193.12 D 4134 D Common Stock 2026-03-05 4 S 0 300 194.98 D 3834 D Common Stock 2026-03-05 4 S 0 100 196.45 D 3734 D Common Stock 2026-03-05 4 S 0 1514 199.4874 D 2220 D Common Stock 2026-03-05 4 S 0 300 202.1833 D 1920 D Non Qualified Stock Option 41.61 2026-03-05 4 M 0 1920 0 D 2025-05-02 Common Stock 1920 15358 D Non Qualified Stock Option 60.61 2026-03-05 4 M 0 2585 0 D 2025-04-25 Common Stock 2585 7752 D Non Qualified Stock Option 75.43 2026-03-05 4 M 0 914 0 D 2025-05-12 Common Stock 914 1827 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 $177.1800 to $177.1800. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $178.7900 to $179.7700. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $180.0500 to $181.0100. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $181.1600 to $181.9400. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $182.1700 to $182.1700. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $185.5100 to $185.5100. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $186.9200 to $187.8800. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $189.0600 to $189.4800. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $192.9800 to $193.1900 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $194.9500 to $195.0000. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $196.4500 to $196.4500. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $199.4200 to $199.7200. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $202.1100 to $202.2600 Options expire 2 years from each date of vesting. /s/Quentin A. Fendelet Attorney in fact for Philip D. Davies 2026-03-05