This Amendment No. 1 to Schedule 13G, filed August 31, 2021, serves as an exit filing under Rule 13d-1(d) for Vector Acquisition Partners, L.P. (Sponsor) and Vector Capital Partners V, Ltd. (General Partner), disclosing they beneficially own 0 Class A Ordinary Shares of Vector Acquisition Corporation (SPAC that merged with Rocket Lab USA). Original 13G was filed December 31, 2020; event triggering this amendment is August 25, 2021, coinciding with the SPAC merger closing, after which shares converted to RKLB. The Sponsor, typically holding ~20% pre-merger via founder shares and warrants, has fully disposed, with no sole/shared voting or dispositive power. Board of directors disclaims beneficial ownership beyond pecuniary interest. For Rocket Lab, this marks complete sponsor exit post-merger, common in SPACs as sponsors redeem or sell to realize promote.

Neutral for RKLB investors; sponsor exit eliminates potential overhang from locked-up founder shares but reflects typical post-merger monetization. No ongoing influence from Vector sponsor. Monitor for any sponsor-related warrants exercise or secondary sales, though this filing confirms full divestiture as of merger close.