Vicor Corporation's stock experienced a 24-hour plunge of 5.29%, reflecting significant selling pressure during the trading session.

The decline is attributed to profit-taking activity following a substantial post-earnings rally. The company's FY26Q1 results had previously exceeded market expectations for both revenue and earnings per share, driven by better-than-forecast capacity expansion and the addition of Cerebras as a key customer. This positive performance fueled a significant short-term price increase, prompting investors to lock in gains.

Additional downward pressure emerged from recent insider selling, with company directors reducing their holdings. This activity intensified market concerns about near-term selling supply and contributed to the stock's heightened volatility during the session.