Vector Acquisition Corporation, a Cayman Islands SPAC targeting aerospace and defense, had this Schedule 13G filed on October 1, 2020, reporting a >5% passive stake by Millennium Management affiliates. As of September 30, 2020, they beneficially owned 2,520,000 Class A Ordinary Shares (8.4% of 30 million outstanding) through holding equivalent units (each unit: 1 share + 1/3 warrant). Ownership split: Integrated Core Strategies (US) LLC (940,000 shares, 3.1%), Riverview Group LLC (600,000, 2.0%), ICS Opportunities Ltd. (980,000, 3.3%). Control rests with Millennium entities and Israel A. Englander via shared voting/dispositive power. Certification confirms passive intent, not for control change. Vector merged with Rocket Lab in February 2021, converting these to RKLB shares, highlighting pre-merger institutional support.

For Rocket Lab investors, this 2020 filing reveals early passive investment by major hedge fund Millennium in the pre-merger SPAC, signaling sector confidence but no activism. Near-term impact negligible today; strategically minor as position likely changed post-merger. Monitor 13D/G amendments or current 13F for ongoing ownership.