Credit: Angus Mordant/Bloomberg Krispy Kreme Inc.’s shares soared in their first day of trading, giving the doughnut chain a much-needed lift a day after it was forced to downsize its initial public offering. The stock reversed an early decline and jumped 24% to $21 a share Thursday. The Charlotte, North Carolina-based company, which is owned by investment firm JAB Holdings BV, opened at $16.30, below the $17 IPO price. The roller-coaster debut reflects the volatile environment for restaurants as the pandemic subsides. Many U.S. eateries, particularly those focused on breakfast, faced a difficult period of store closures and reduced sales as COVID-19 led Americans to eat more at home. Sales at U.S. Krispy Kreme shops rose 4.5% to $733.4 million in 2020, according to Technomic.