Tranche Update on Vicor Corporation's Equity Buyback Plan announced on November 30, 2000.

Vicor Corporation designs, develops, manufactures, and markets modular power components and power systems for converting electrical power for use in electrically powered devices. It offers a range of alternating current (AC) and direct current (DC) power conversion products. It also provides products addressing other DC voltage standards. It categorizes its offerings as Advanced products and Brick products. Its Advanced products category consists of products which are used to implement its proprietary Factorized Power Architecture (FPA), an advanced power distribution architecture enabling flexible, rapid power system design using individual components optimized to perform a specific conversion function. The Brick-format converters provide the integrated transformation, rectification, isolation, regulation, filtering, and/or input protection necessary to power and protect loads, across a range of conventional power architectures. It offers a range of brick-format DC-DC converters.