Exhibit 99.1 Fortrea Reports Fourth Quarter and Full-Year 2023 Results; Issues Full-Year 2024 Guidance For the three months ended December 31, 2023 and full year 2023: • Revenues of $775.4 million for fourth quarter,$3,109.0 million for the full year • GAAP net loss of $(36.0) million for the fourth quarter,$(3.4) million for the full year • Adjusted EBITDA of $67.2 million for the fourth quarter,$267.3 million for the full year • Fourth-quarter book-to-bill ratio of 1.30x DURHAM, N.C., March 11, 2024 — ...