X0609 4 2026-09-02 0 0001819994 Rocket Lab Corp RKLB 0001509421 Spice Adam C. false 3881 MCGOWEN STREET LONG BEACH CA 90808 0 1 0 0 Chief Financial Officer 1 Common Stock 2026-09-02 4 M 0 140157 1.09 A 1296124 D Common Stock 2026-09-02 4 S 0 67257 62.2564 D 1228867 D Common Stock 2026-09-02 4 S 0 72900 62.9704 D 1155967 D Common Stock 250000 I by Trust Employee Stock Option (right to buy) 1.09 2026-09-02 4 M 0 140157 0.0 D 2028-08-03 Common Stock 140157 2382668 D Represents the sale of shares which occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 03, 2026. The price reported in Column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $61.5900 to $62.5800. The Reporting Person undertakes to provide the Registrant, any securityholder of the Registrant, or the Staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The price reported in Column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $62.5900 to $63.4700. The Reporting Person undertakes to provide the Registrant, any securityholder of the Registrant, or the Staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The stock option was granted on August 3, 2018, and had a vesting commencement date of May 25, 2018. 1/4 of the shares subject to the stock option vest on the one year anniversary of the vesting commencement date, and 1/48 of the shares subject to the stock option vest on a monthly basis each month thereafter, subject, in each case, to the reporting person's continued service relationship through each applicable vesting date. By: /s/ Arjun Kampani, as Attorney-in-Fact For: Adam Spice 2026-09-04