TXN

Vicor (VICR) stock has more than quadrupled over the past year, yet at about $224 it sits roughly 41% below its 52-week high. The opportunity is plain: demand for its power modules, from AI data centers to defense, is filling its first chip fab. The catch is that the growth you would pay for depends on new fabs whose sites Vicor only bought in September.

Microchip has risen 17% year‑to‑date as demand, inventory normalization and data‑center growth improve. Supply, debt and valuation risks remain.

Heartland Advisors, an investment management company, released its second-quarter 2026 investor letter for “Heartland Opportunistic Value Equity Strategy”. The letter can be downloaded here. Second-quarter indices signaled a broadening market, but strong performance was mainly focused on a limited range of technology infrastructure and semiconductor stocks.

Vicor (VICR) stock gained 21.2% in the week to Monday, Sep 21, while the S&P 500 rose 1.9%. The spark was a new license for its AI power technology. The company said what that license adds to its sales only after Monday's close, when it raised its revenue outlook. So the shares paid for the deal before Vicor put a number on it.