Rocket Lab Corp

Rocket Lab USA, Inc. (the “ Company ”) is unable to file, without unreasonable effort or expense, its Annual Report on Form 10-K for the fiscal year ended December 31, 2022 (the “ 2022 Form 10-K ”) within the prescribed time period for the reasons set forth below. The Company became a large accelerated filer for the first time at the end of the fiscal year ended December 31, 2022, which resulted in a significantly shortened filing deadline to file its 2022 Form 10-K of 60 days compared to 90 days when the Company was a smaller reporting company and emerging growth company at the end of its prior fiscal year. Additionally, commencing with its 2022 Form 10-K, the Company is now for the first time subject to the requirements of Section 404(b)of the Sarbanes-Oxley Act of 2002 (“SOX Act”). For the foregoing reason, the Company requires additional time to complete the procedures relating to its year-end reporting process, including finalizing those disclosures and conclusions required by Section 404(b)of the SOX Act, and procedures and conclusions relating to management’s assessment of the effectiveness of internal controls. The Registrant is working diligently to complete the necessary procedures, and expects to file the 2022 Form 10-K within the extension period provided under Rule 12b-25 under the Securities Exchange Act of 1934, as amended

Vector Acquisition Corporation (the “Company”) has determined that it is unable, without unreasonable effort or expense, to file its Form 10-Q for the fiscal quarter ended March 31, 2021 (the “Form 10-Q”) by the prescribed due date for the reasons described herein. On April 12, 2021, the staff of the Securities and Exchange Commission (the “SEC”) issued a public statement entitled “Staff Statement on Accounting and Reporting Considerations for Warrants issued by Special Purpose Acquisition Companies” (“SPACs”) (the “Statement”). In the Statement, the SEC staff expressed its view that certain terms and conditions common to SPAC warrants may require the warrants to be classified as liabilities on the SPAC’s balance sheet as opposed to equity. The Company is currently determining the extent of the Statement’s impact on its financial statements as of and for the fiscal quarter ended March 31, 2021 included in the Form 10-Q and requires additional time to ensure the accuracy of such financial statements. The Company expects to file the Form 10-Q on or before the fifth calendar day following the prescribed due date