MEDIA RELEASE Exhibit 99.1 Rocket Lab Announces First Quarter 2024 Financial Results Reflecting Year-on-Year Revenue Growth of 69%, Sequential Quarterly Growth of 55%, and Continued Growth in Q2 2024 Rocket Lab also provided a major update on the progress of its new rocket Neutron, including that it has completed its first Archimedes engine build and has begun its engine test campaign in Mississippi. Long Beach, California. May 06, 2024 – Rocket Lab USA, Inc. (Nasdaq: RKLB) (“Rocket Lab” or “the Company”), ...