X0609 4 2026-05-26 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 2026-05-26 4 S 0 1657 139.4122 D 1044136 D Common Stock 2026-05-26 4 S 0 4933 140.2017 D 1039203 D Common Stock 2026-05-26 4 S 0 6128 141.4563 D 1033075 D Common Stock 2026-05-26 4 S 0 18256 142.355 D 1014819 D Common Stock 2026-05-26 4 S 0 24436 143.2433 D 990383 D Common Stock 2026-05-26 4 S 0 7334 144.1287 D 983049 D Common Stock 250000 I by Trust Represents the sale of shares pursuant to a "sell-to-cover" transaction pursuant to a Rule 10b5-1 election adopted by the Reporting Person in order to satisfy applicable tax withholding obligations in connection with the vesting and settlement of restricted stock units previously granted to the Reporting Person. The price reported in Column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $138.7700 to $139.7600. 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. Includes 527 shares acquired under the Rocket Lab Corporation 2021 Employee Stock Purchase Plan in transactions that were exempt under both Rule 16b-3(d) and Rule 16b-3(c). The price reported in Column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $139.8000 to $140.8000. 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 $140.8200 to $141.8200. 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 $141.8300 to $142.8300. 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 $142.8400 to $143.8300. 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 $143.8500 to $144.7600. 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. On April 22, 2026, the reporting person contributed 250,000 shares to the SPICE 2026 RKLB GRAT (the "GRAT"), a grantor retained annuity trust for which the reporting person serves as both grantor and trustee. The Reporting Person retains an annuity interest in the GRAT for the trust term and maintains voting control over the shares held by the GRAT. The shares previously reported as directly held are now reported as indirectly held to reflect the Reporting Person's continued beneficial ownership through the GRAT. By: /s/ Arjun Kampani, as Attorney-in-Fact For: Adam Spice 2026-05-28