Constellation Energy Corp's stock experienced a significant pre-market plunge of 5.12% on Monday. The sharp decline came as the company announced a major secondary public offering that introduced substantial new supply of its shares to the market.

The power producer priced an underwritten secondary offering of 11 million common shares at $281 per share, representing a discount to the stock's previous closing price. The offering, which is expected to generate approximately $3.1 billion in gross proceeds, was initiated by certain existing shareholders rather than the company itself, meaning Constellation Energy will not receive any proceeds from the sale.

Market analysts noted that the offering price represented a 2.3% discount to the stock's last sale on Friday, creating immediate selling pressure in pre-market trading. The large-scale equity sale increases the secondary market supply significantly, with the 11 million shares representing roughly 3% of the company's total outstanding shares of approximately 361 million, contributing to dilution concerns among investors.