# EDGAR Filing Document

**Accession Number:** 0001898769
**File Stem:** 0001493152-26-015017
**Filing Date:** 2026-4
**Character Count:** 15708
**Document Hash:** d0e8e1c0f4ffa01fe57cacc24825b067
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001493152-26-015017.hdr.sgml**: 20260402

**ACCESSION NUMBER**: 0001493152-26-015017

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D/A

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20260402

**DATE AS OF CHANGE**: 20260402

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Energy Vault Holdings, Inc.
- **CENTRAL INDEX KEY:** 0001828536
- **STANDARD INDUSTRIAL CLASSIFICATION:** MISCELLANEOUS ELECTRICAL MACHINERY, EQUIPMENT & SUPPLIES [3690]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 853230987
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-92256
- **FILM NUMBER:** 26836555

**BUSINESS ADDRESS:**
- **STREET 1:** 4165 EAST THOUSAND OAKS BLVD.
- **STREET 2:** SUITE 100
- **CITY:** WESTLAKE VILLIAGE
- **STATE:** CA
- **ZIP:** 91362
- **BUSINESS PHONE:** 805-852-0000

**MAIL ADDRESS:**
- **STREET 1:** 4165 EAST THOUSAND OAKS BLVD.
- **STREET 2:** SUITE 100
- **CITY:** WESTLAKE VILLIAGE
- **STATE:** CA
- **ZIP:** 91362

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Novus Capital Corp II
- **DATE OF NAME CHANGE:** 20201015
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Piconi Robert
- **CENTRAL INDEX KEY:** 0001898769

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A

**MAIL ADDRESS:**
- **STREET 1:** C/O HEALTHCARE AI ACQUISITION
- **STREET 2:** 7 STANLEY GARDENS
- **CITY:** LONDON
- **STATE:** CA
- **ZIP:** W112ND

## Ex-1

**Exhibit 1**

**Open Market Transactions**

---

| | | | | |
|:---|:---|:---|:---|:---|
| **Date** | **Acquisition or Disposition**  | **Number of Shares** | **Price Range** | **Average Price Per Share** |
| 08/18/2022 | Acquisition | 18954 | $5.19 to $5.30 | $5.2555 |
| 08/23/2022 | Acquisition | 9400 | $5.21 to $5.23 | $5.2198 |
| 08/24/2022 | Acquisition | 9450 | $5.20 to $5.21 | $5.2071 |
| 03/14/2023 | Acquisition | 66000 | $2.22 to $2.28 | $2.2681 |
| 03/15/2023 | Acquisition | 40000 | $2.195 to $2.275 | $2.2432 |
| 09/15/2023 | Acquisition | 49915 | $2.945 to $3.005 | $2.9750 |
| 02/08/2024 | Disposition | 2503 | N/A | $1.6050 |
| 03/19/2024 | Disposition | 8855 | N/A | $1.6340 |
| 05/03/2024 | Disposition | 2683 | N/A | $1.2510 |
| 06/07/2024 | Disposition | 9694 | N/A | $1.1640 |
| 08/09/2024 | Disposition | 3184 | N/A | $0.8470 |
| 09/06/2024 | Disposition | 10213 | N/A | $0.8520 |
| 09/13/2024 | Acquisition | 300000 | $0.7854 to $0.92 | $0.8673 |
| 11/11/2024 | Disposition | 2859 | N/A | $2.0870 |
| 11/22/2024 | Acquisition | 150000 | $1.505 to $1.59 | $1.5686 |
| 12/13/2024 | Disposition | 9697 | N/A | $1.8297 |
| 02/07/2025 | Disposition | 2806 | N/A | $1.6392 |
| 04/04/2025 | Disposition | 16594 | N/A | $0.7059 |
| 05/16/2025 | Disposition | 40277 | N/A | $0.9418 |
| 06/06/2025 | Disposition | 9326 | N/A | $0.9750 |
| 07/18/2025 | Disposition | 12135 | N/A | $0.8105 |
| 08/28/2025 | Acquisition | 55000 | $1.64 to $1.79 | $1.7057 |
| 08/29/2025 | Acquisition | 22500 | $1.905 to $1.92 | $1.9159 |
| 09/16/2025 | Acquisition | 25000 | $2.18 to $2.225 | $2.2114 |
| 09/17/2025 | Acquisition | 50000 | $2.28 to 2.33 | $2.3024 |
| 09/19/2025 | Acquisition | 17500 | $2.9925 to $3.04 | $3.0214 |
| 11/14/2025 | Acquisition | 10000 | $2.995 to $3.00 | $2.9958 |
| 02/26/2026 | Acquisition | 7500 | N/A | $3.255 |
| 03/31/2026 | Acquisition | 12500 | N/A | $3.2096 |

---

## Ex-2

**Exhibit 2**

**Irrevocable Proxy**

The undersigned stockholder (the "Stockholder") with respect to all of the shares of common stock (the "Shares") in Energy Vault Holdings, Inc., a Delaware corporation (the "Company"), which the Stockholder beneficially owns as of the date hereof, hereby appoints Robert Piconi (the "Holder") as her true and lawful proxy and attorney-in-fact, with full power of substitution, to (i) vote the Shares at any meeting of stockholders of the Company or (ii) act by written consent on behalf of the Stockholder, in any manner that the Holder may determine in his sole and absolute discretion to be in the Holder's own best interest.

The proxies and powers granted herein are irrevocable and binding upon, and enforceable against, the Stockholder and her beneficiaries, successors, assigns, transferees, representatives and executors thereof. The proxies and powers granted herein are coupled with an interest and shall not be terminated by any act of the Stockholder or by operation of law, by death or incapacity of the Stockholder, by lack of appropriate power or authority, or by the occurrence of any other event or events, except as expressly provided herein. The Stockholder hereby revokes any and all prior proxies granted by the Stockholder with respect to the Shares, and agrees not to grant any subsequent proxies with respect to the Shares or enter into any agreement or understanding with any person to vote or give instructions with respect to the Shares in any manner inconsistent with the terms of this Irrevocable Proxy.

This Irrevocable Proxy shall terminate, with respect to all the Shares, upon the death or incapacity of the Holder, and, with respect to any Shares, upon the bona fide transfer for value of such Shares.

The parties hereto expressly acknowledge and agree that this Irrevocable Proxy gives the Holder the exclusive right to vote (or consent) with respect to the Shares.

---

| | |
|:---|:---|
| Signature (Stockholder) | Signature (Holder) |
| Print Name | Print Name |
| Date | Date |

---

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**(Amendment No. 1)**

**Energy Vault Holdings, Inc.**

*(Name of Issuer)*

**Common Stock, par value $0.0001 per share**

*(Title of Class of Securities)*

**—**

*(CUSIP Number)*

**Robert Piconi**<br>4165 East Thousand Oaks Blvd.<br>Suite 100<br>Westlake Village CA 91362<br>(805) 852-0000

*(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)*

**10/31/2023**

*(Date of Event Which Requires Filing of this Statement)*

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Robert Piconi** | Name of reporting person<br>**Robert Piconi** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**23417827.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**11689129.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**23417827.00** | Aggregate amount beneficially owned by each reporting person<br>**23417827.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**13.4%** | Percent of class represented by amount in Row (11)<br>**13.4%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Common Stock, par value $0.0001 per share

**(b) Name of Issuer:**
Energy Vault Holdings, Inc.

**(c) Address of Issuer's Principal Executive Offices:**
4165 East Thousand Oaks Blvd., Suite 100, Westlake Village, CA, 91362

Explanatory Note

This Amendment No. 1 to Schedule 13D ("Amendment No. 1") amends and supplements the Schedule 13D originally filed with the United States Securities and Exchange Commission (the "SEC") on February 22, 2022 (as amended to date, the "Schedule 13D"), relating to the common stock, $0.0001 par value per share ("Common Stock"), of Energy Vault Holdings, Inc., a Delaware corporation (the "Issuer"). Capitalized terms used herein without definition shall have the meanings set forth in the Schedule 13D.

**Item 4. Purpose of Transaction**

Settlement Agreement and Irrevocable Proxies

On February 17, 2026, the Reporting Person disposed of 3,112,806 shares of Common Stock (the "Settlement Shares") pursuant to an agreement involving the transfer of shares, among other family-related matters (the "Settlement Agreement"). Pursuant to the Settlement Agreement, the Reporting Person was provided an irrevocable proxy to vote or act by written consent with regard to the Settlement Shares until the earlier of the death or incapacity of the recipient of the Settlement Shares or the bona fide transfer of the Settlement Shares for value. In addition, the Reporting Person was also granted irrevocable proxies by the trustees of certain family trusts, of which the Reporting Person no longer serves as investment advisor as a result of the Settlement Agreement. Accordingly, the Reporting Person will retain voting control over the Settlement Shares and the shares held by the family trusts.

General

Any actions the Reporting Person might undertake with respect to the securities beneficially owned by him in the Issuer may be made at any time and from time to time without prior notice and will be dependent upon the Reporting Person's review of numerous factors, including, but not limited to: an ongoing evaluation of the Issuer's business, financial condition, operations and prospects; price levels of the Issuer's securities; general market, industry and economic conditions; the relative attractiveness of alternative business and investment opportunities; and other future developments.

The Reporting Person may acquire additional securities of the Issuer, or retain or sell all or a portion of the securities then held, in the open market or in privately negotiated transactions. The Reporting Person may also enter into financial instruments or other agreements with institutional or other counterparties that would increase or decrease the Reporting Person's economic exposure with respect to his investment in the Issuer, which instruments or agreements may or may not affect the Reporting Person's beneficial ownership in securities of the Issuer. In addition, the Reporting Person may, including in his capacity as the Chairman of the Board of Directors (the "Board") and Chief Executive Officer of the Issuer, engage in discussions with management, the Board, and other securityholders of the Issuer and other relevant parties or encourage, cause or seek to cause the Issuer or such persons to consider or explore extraordinary corporate transactions, such as: a merger, reorganization or take-private transaction that could result in the de-listing or de-registration of the Common Stock; sales or acquisitions of assets or businesses; changes to the capitalization or dividend policy of the Issuer; or other material changes to the Issuer's business or corporate structure, including changes in management or the composition of the Board.

To facilitate his consideration of such matters, the Reporting Person may retain consultants and advisors and may enter into discussions with potential sources of capital and other third parties. The Reporting Person may exchange information with any such persons pursuant to appropriate confidentiality or similar agreements. The Reporting Person will likely take some or all of the foregoing steps at preliminary stages in his consideration of various possible courses of action before forming any intention to pursue any particular plan or direction.

Other than as described above, the Reporting Person does not currently have any plans or proposals that relate to, or would result in, any of the matters listed in Items 4(a)-(j) of Schedule 13D, although, depending on the factors discussed herein, the Reporting Person may change his purpose or formulate different plans or proposals with respect thereto at any time.

**Item 5. Interest in Securities of the Issuer**

**(a)**
The Reporting Person may be deemed to beneficially own 23,417,827 shares of Common Stock, representing 13.4% of the Common Stock, based upon 172,975,047 shares of Common Stock outstanding as of March 13, 2026, as disclosed in the Issuer's Annual Report on Form 10-K filed with the SEC on March 18, 2026.

The amount of Common Stock reported as beneficially owned herein includes (i) 9,389,129 shares of Common Stock held directly by the Reporting Person, (ii) 11,728,698 shares of Common Stock in which the Reporting Person maintains sole voting control pursuant to irrevocable proxies, and (iii) 2,300,000 shares of Common Stock underlying stock options that are currently exercisable or will be exercisable within 60 days of the date hereof.

**(b)**
Sole power to vote or to direct the vote: 23,417,827

Shared power to vote or to direct the vote: 0

Sole power to dispose or to direct the disposition: 11,689,129

Shared power to dispose or to direct the disposition: 0

**(c)**
Since the prior Schedule 13D filing, the Reporting Person effected the open market transactions of Common Stock listed in Exhibit 1 hereto. The Reporting Person undertakes to provide, upon request by the staff of the SEC, the Issuer, or a security holder of the Issuer, full information regarding the number of shares purchased at each separate price for each transaction. The open market dispositions listed in Exhibit 1 hereto were made to satisfy the Reporting Person's tax liability on vesting of RSUs.

In addition to the transactions listed in Exhibit 1, since the prior Schedule 13D filing, an aggregate of 602,090 shares of Common Stock have been withheld by the Issuer to cover tax liability on vesting of RSUs.

**Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.**

Item 4 above summarizes the irrevocable proxies and is incorporated herein by reference. A copy of the form of irrevocable proxy is attached as an exhibit to this Schedule 13D, and is incorporated herein by reference.

Other than as described above, the Reporting Person does not have any contracts, arrangements, understandings or relationships (legal or otherwise) with any person with respect to any securities of the Issuer, including but not limited to any contracts, arrangements, understandings or relationships concerning the transfer or voting of such securities, finder's fees, joint ventures, loan or option arrangements, puts or calls, guarantees of profits, division of profits or losses, or the giving or withholding of proxies.

### SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Robert Piconi

**Signature:** /s/ Robert Piconi

**Name/Title:** Robert Piconi

**Date:** 04/02/2026