Shares of Packaging Corp of America (PKG) tumbled 5.05% in pre-market trading on Wednesday, as investors reacted to the company's disappointing second-quarter profit forecast. The packaging solutions provider's stock price decline reflects growing concerns about its near-term financial performance.

The sharp downturn comes after Packaging Corp of America released its financial outlook, projecting second-quarter profits below Wall Street's expectations. This underwhelming forecast has prompted a sell-off among investors, who are reassessing their positions in light of the company's potentially weakened profitability for the upcoming quarter.

Packaging Corp of America, a leading producer of containerboard and corrugated packaging products, has likely faced challenges such as increased raw material costs or softening demand in its key markets. The lower-than-expected profit forecast may signal broader issues within the packaging industry or specific headwinds facing the company. As the trading day progresses, investors and analysts will be closely monitoring any additional information or guidance from the company to better understand the factors behind this pessimistic outlook and its potential long-term implications for Packaging Corp of America's business.