Shares of Six Flags Entertainment Corp. /zigman2/quotes/208050417/composite SIX -1.80% rallied 7.9% in premarket trading Tuesday, after the theme park operator said it will reopen its first park, with limited capacity, on June 5. The company said its Frontier City theme park in Oklahoma City will open in "preview mode" for members and season pass holders only from June 5 to June 7. "We have developed a comprehensive reopening safety plan that includes best practices from theme park and waterpark industry experts, along with top destination parks from around the world, which will allow guests to experience our parks in the safest possible way," said Chief Executive Mike Spanos. "This 'new normal' will be very different, but we believe these additional measures are appropriate in the current environment." Among the safety measures, all guests over the age of two will be required to weak face masks, temperatures of guests and employees will be taken before park entry, guests will be separated by rows or seats on all rides and capacity at indoor venues will be reduced. The stock has tumbled 47.8% year to date through Friday, while the S&P 500 /zigman2/quotes/210599714/realtime SPX +1.34% has lost 8.5%.