X0609 4 2026-05-11 0 0000751978 VICOR CORP VICR 0001912196 Fendelet Quentin A. false 25 FRONTAGE RD. ANDOVER MA 01810 0 1 0 0 Corp. VP - CAO 0 Common Stock 2026-05-11 4 M 0 4963 33.96 A 4963 D Common Stock 2026-05-11 4 M 0 96 41.61 A 5059 D Common Stock 2026-05-11 4 S 0 700 290.0057 D 4359 D Common Stock 2026-05-11 4 S 0 262 291.4403 D 4097 D Common Stock 2026-05-11 4 S 0 238 292.6635 D 3859 D Common Stock 2026-05-11 4 S 0 497 293.634 D 3362 D Common Stock 2026-05-11 4 S 0 100 295 D 3262 D Common Stock 2026-05-11 4 S 0 533 297.5394 D 2729 D Common Stock 2026-05-11 4 S 0 200 299.445 D 2529 D Common Stock 2026-05-11 4 S 0 1930 300.1263 D 599 D Common Stock 2026-05-11 4 S 0 599 301.3427 D 0 D Non Qualified Stock Option 33.96 2026-05-11 4 M 0 4963 0 D 2026-05-03 2028-05-03 Common Stock 4963 14889 D Non Qualified Stock Option 41.61 2026-05-11 4 M 0 96 0 D 2026-05-02 2028-05-02 Common Stock 96 4529 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $290.0000 to $290.0400. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $291.0000 to $291.7900. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $292.0000 to $292.9900. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $293.5000 to $293.9700. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $295.0000 to $295.0000. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $297.3700 to $297.8000. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $299.0000 to $299.8900. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $300.0000 to $300.4900. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $301.0000 to $301.9700. /s/ Kemble D. Morrison Attorney in Fact for Quentin A. Fendelet 2026-05-12