VICOR CORP

(b) Except as set forth below, during the three months ended December 31, 2025, no director or Section 16 officer of the Company adopted orterminated a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement,” as each term is defined in Item 408(a) of Regulation S-K.

On November 3, 2025, Patrizio Vinciarelli, Chairman of the Board, President and Chief Executive Officer of the Company, adopted a Rule 10b5-1 trading arrangement providing for the sale, pursuant to the terms of the arrangement, of an aggregate of up to 1,000,000 shares of the Company’s common stock. Mr. Vinciarelli’s trading arrangement is intended to satisfy the affirmative defense in Rule 10b5-1(c). The duration of Mr. Vinciarelli’s trading arrangement is estimated to be from March 2, 2026 until December 31, 2027.

On December 10, 2025, James F. Schmidt, Corporate Vice President, Chief Financial Officer, Treasurer and Secretary of the Company and a member of the Company’s Board of Directors, adopted a Rule 10b5-1 trading arrangement providing for the sale, pursuant to the terms of the arrangement, of an aggregate of up to 35,224 shares of the Company’s common stock. Mr. Schmidt’s trading arrangement is intended to satisfy the affirmative defense in Rule 10b5-1(c). The duration of Mr. Schmidt’s trading arrangement is estimated to be from March 11, 2026 until December 31, 2026.

On December 11, 2025, Estia J. Eichten, a member of the Company’s Board of Directors, adopted a Rule 10b5-1 trading arrangement providing for the sale, pursuant to the terms of the arrangement, of an aggregate of up to 40,587 shares of the Company’s common stock. Mr. Eichten’s trading arrangement is intended to satisfy the affirmative defense in Rule 10b5-1(c). The duration of Mr. Eichten’s trading arrangement is estimated to be from March 12, 2026 until March 10, 2028.

On November 21, 2025, Philip D. Davies, Corporate Vice President, Global Sales and Marketing of the Company, adopted a Rule 10b5-1 trading arrangement providing for the sale, pursuant to the terms of the arrangement, of an aggregate of up to 42,289 shares of the Company’s common stock. Mr. Davies’ trading arrangement is intended to satisfy the affirmative defense in Rule 10b5-1(c). The duration of Mr. Davies’ trading arrangement is estimated to be from February 27, 2026 until March 31, 2027.