X0306 4 2022-09-02 0 0001819994 Rocket Lab USA, Inc. RKLB 0001589827 Frank Edward H. C/O ROCKET LAB USA, INC. 3881 MCGOWEN STREET LONG BEACH CA 90808 1 0 0 0 Common Stock 2022-09-02 4 A 0 67589 0.00 A 67589 D Represents restricted stock units ("RSUs") granted to Dr. Frank under the Company's Amended and Restated Non-Employee Director Compensation Policy. Such RSUs vest as follows: 1/3 of the RSUs will vest September 2, 2023, 1/3 will vest September 2, 2024, and 1/3 will vest September 2, 2025, in each case subject to the reporting person's continuous service relationship through each applicable vesting date. The RSUs were granted on September 2, 2022. /s/ Arjun Kampani, as Attorney-in-Fact for Edward H. Frank 2022-09-07