Shares of Constellation Energy Corp (CEG) tumbled 5.25% in pre-market trading on Tuesday after the company reported mixed first-quarter 2025 results that fell short of analysts' profit expectations. The miss was primarily attributed to higher operating and interest expenses.

Constellation Energy reported adjusted earnings per share of $2.14 for Q1, up from $1.82 in the same period last year. However, this figure missed the consensus estimate of $2.22 per share. The company's net income saw a steep decline of approximately 87% year-over-year to $118 million. Despite the earnings miss, Constellation's Q1 revenue rose 10.2% to $6.79 billion, surpassing analysts' expectations of $5.44 billion.

The utility company faced headwinds from increased operating expenses, which climbed 18.5% to $6.34 billion, and higher interest expenses, which rose nearly 15% to $146 million compared to the previous year. These factors significantly impacted the bottom line, overshadowing the revenue growth.

Despite the disappointing quarterly results, Constellation Energy reaffirmed its full-year 2025 adjusted earnings guidance range of $8.90 to $9.60 per share, in line with the current FactSet estimate of $9.44. The company also noted that its $16.4 billion acquisition of Calpine, a privately held natural gas and geothermal company, remains on track to be completed by the end of the year, despite facing some backlash from consumer groups.