Aehr Test's stock experienced a pre-market plunge of 5.11% on Tuesday, reflecting a sharp negative reaction from investors at the opening of the trading session.

The decline is primarily attributed to the company's recent completion of a $60 million follow-on equity offering. Investors are likely concerned about potential dilution of existing shareholders, as the capital raise comes at a time when the stock trades at a premium valuation and the company has reported a recent net loss, adding to market volatility.