Rocket Lab Corp

Sell to Cover Trading Election

On August 13, 2026, Agostino Ricupati, Chief Accounting Officer (the “Participant”), entered into a Rule 10b5-1 trading arrangement that is intended to qualify as a “plan providing for eligible sell-to-cover transactions” under Rule 10b5-1(c)(1)(ii)(D)(3) under the Exchange Act. The plan will apply to all RSUs granted to the Participant by the Company, whether granted prior to the date of the election or on or subsequent to the date of the election, pursuant to the Company’s 2021 Stock Option and Incentive Plan or any successor equity incentive plan. The sell-to-cover election provides for the sale of shares of common stock issued upon the vesting of restricted stock units in an amount sufficient to cover the federal, state, local, and foreign tax withholding obligations incurred in connection with such vesting.

The sell-to-cover election is effective until December 31, 2027, unless terminated earlier due to specified events, such as the individual’s death or legal or regulatory restrictions. The number of shares sold under this election will vary based on the tax withholding obligations incurred upon vesting.