Energy Vault Holdings, Inc.

Energy Vault Holdings, Inc. plans to submit its Quarterly Report on Form 10-Q for the three months ended March 31, 2026 on May 18, 2026, following this filing notification. The extension of time is due to a lender discussion on a subsequent event and associated financial statement reclassification

Due to logistical delays related to required communications encountered while submitting its Quarterly Report on Form 10-Q for the three months ended March 31, 2025 (the “10-Q”) with the Securities and Exchange Commission (the “SEC”), the registrant’s submission of the 10-Q was not received by the SEC until after 5:30 p.m. on May 12, 2025. The 10-Q was accepted by the SEC after 5:30 p.m. on May 12, 2025

Energy Vault Holdings, Inc. (the “Company”) is filing this Notification of Late Filing on Form 12b-25 with respect to its Annual Report on Form 10-K for the fiscal year ended December 31, 2024 (the “Form 10-K”). The Company has determined that it is unable to file its Form 10-K within the prescribed time period without unreasonable effort or expense for the reasons set forth below. Reasons for Delay Energy Vault Holdings, Inc. (the “Company”) has determined that it is unable to file its Annual Report on Form 10-K for the year ended December 31, 2024 (the “Annual Report”) within the prescribed time period without unreasonable effort or expense because it requires additional time to complete its financial statements and review process. As a result of the foregoing, BDO USA, P.C., the Company’s independent registered public accounting firm, has not yet completed its audit procedures. The Company expects to file its Form 10-K on or before Tuesday, April 1, 2025, which is within the fifteen-calendar day extension provided by Rule 12b-25. Forward-Looking Statements This Notification of Late Filing on Form 12b-25 contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. Words such as “expect,” “will,” “anticipates,” “estimates” and variations of such words and similar future or conditional expressions are intended to identify forward-looking statements. These forward-looking statements include, but are not limited to, statements regarding the Company’s expectations regarding its ability to make the Company’s Form 10-K filing. Forward-looking statements are based on management’s current expectations based on information currently available to the Company

Energy Vault Holdings, Inc. (the “Company”) is filing this Notification of Late Filing on Form 12b-25 with respect to its Annual Report on Form 10-K for the fiscal year ended December 31, 2022 (the “Form 10-K”). The Company has determined that it is unable to file its Form 10-K within the prescribed time period without unreasonable effort or expense for the reasons set forth below. Reasons for Delay The Company has determined that it is unable to file the Form 10-K within the prescribed time period without unreasonable effort or expense because it requires additional time to complete its financial statement preparation and review process. As a result of the foregoing, BDO USA, LLP, the Company’s independent registered public accounting firm, has not yet completed its audit procedures. The Company expects to file its Form 10-K on or before Friday, April 14, 2023, which is within the fifteen-calendar day extension provided by Rule 12b-25. Forward-Looking Statements This filing contains a number of forward-looking statements. Words such as “expect,” “will,” “working,” and variations of such words and similar future or conditional expressions are intended to identify forward-looking statements. These forward-looking statements include, but are not limited to, statements regarding our beliefs and expectations relating to the filing of the Form 10-K and the estimated reporting of financial results. These forward-looking statements are not guarantees of future results and are subject to a number of risks and uncertainties, many of which are difficult to predict and beyond our control. Important factors that may cause actual results to differ materially from those in the forward-looking statements include, but are not limited to, a material delay in the Company’s financial reporting, including the possibility that the Company will not be able to file its Form 10-K within the fifteen-day extension permitted by the rules of the U.S

Novus Capital Corp. II (the “Registrant”) has elected not to file its quarterly report on Form 10-Q for the fiscal quarter ended September 30, 2021 (the “Form 10-Q”) and is filing a Form 12b-25 for a five day extension deemed necessary for the following reason: As a result of recent guidance to Special Purpose Acquisition Companies by the SEC regarding redeemable equity instruments, the Registrant revisited its application of ASC 480-10-S99 on its financial statements. The Registrant had previously classified a portion of its Class A common stock in permanent equity. In accordance with ASC 480-10-S99 and after discussion with the Registrant’s management, the Registrant’s audit committee concluded that all of its Class A common stock should be classified as temporary equity. The Registrant is working diligently to complete the review of the financial statements for the three months ended September 30, 2021 as soon as possible; however, given the scope of the process for determining the appropriate treatment of the redeemable equity in accordance with ASC 480-10-S99, the Registrant is unable to complete and file the Q3 2021 Form 10-Q by the required due date of November 15, 2021 without unreasonable effort and expense. The Registrant expects to file such report by November 22, 2021. PART IV -- OTHER INFORMATION (1) Name and telephone number of person to contact in regard to this notification Vincent Donargo 317-590-6959 (Name) (Area Code) (Telephone Number) (2) Have all other periodic reports required under Section 13 or 15(d) of the Securities Exchange Act of 1934 or Section 30 of the Investment Company Act of 1940 during the preceding 12 months or for such shorter period that the registrant was required to file such report(s) been filed? If answer is no, identify report(s)

The Registrant is unable to file its Quarterly Report on Form 10-Q for the quarter ended March 31, 2021 within the prescribed period because of a delay in reviewing the financial statements for this period as a result of management requiring additional time to compile and verify the data required to be included in the report. Registrant expects to file within the extension period. PART IV -- OTHER INFORMATION (1) Name and telephone number of person to contact in regard to this notification Vincent Donargo (317) 590-6959 (Name) (Area Code) (Telephone Number) (2) Have all other periodic reports required under Section 13 or 15(d) of the Securities Exchange Act of 1934 or Section 30 of the Investment Company Act of 1940 during the preceding 12 months or for such shorter period that the registrant was required to file such report(s) been filed? If answer is no, identify report(s). x Yes ¨ No (3) Is it anticipated that any significant change in results of operations from the corresponding period for the last fiscal year will be reflected by the earnings statements to be included in the subject report or portion thereof? x Yes ¨ No If so, attach an explanation of the anticipated change, both narratively and quantitatively, and, if appropriate, state the reasons why a reasonable estimate of the results cannot be made. See attachment. Novus Capital Corporation II (Name of Registrant as Specified in Charter) has caused this notification to be signed on its behalf by the undersigned thereunto duly authorized. Date: May 17, 2021 By: /s/ Vincent Donargo Vincent Donargo Chief Financial Officer INSTRUCTION: The form may be signed by an executive officer of the registrant or by any other duly authorized representative. The name and title of the person signing the form shall be typed or printed beneath the signature