Corning (GLW) shares closed down approximately 7.9% on June 9. Rising geopolitical tensions triggered a midday market reversal that erased early technology sector gains.
Investors sold shares due to high valuations following a significant year-to-date rally. Recent analyst downgrades to hold and profit-taking further pressured the stock.
Executive insider selling, including transactions by the CEO, contributed to the downward movement. These losses occurred despite a recent major deal involving optical fiber.