Exhibit 99.1 Parsons* third quarter 2022 earnings press release Parsons Reports Strong First Quarter 2024 Results Q1 2024 Financial Highlights ▪ Record revenue of $1.5 billion increases 31% year-over-year ▪ Record first quarter organic revenue growth of 29%, including four consecutive quarters with organic growth above 20% ▪ Net loss of $107 million due to a $214 million pre-tax charge related to a partial repurchase of 2025 convertible notes above par due to stock price appreciation ▪ Adjusted EBITDA incre ...