Energy Vault (NRGV) CEO adds 12,500 shares in open-market buy

Rhea-AI Filing Summary

Energy Vault Holdings, Inc. Chief Executive Officer Robert Piconi completed an open-market purchase of 12,500 shares of Common Stock at a price of $3.2096 per share. Following this transaction, he directly holds 16,921,594 shares of the company’s common stock.

Insider Trade Summary

Net Buyer: 12,500 shares ($40,120)

Net Buy 1 txn

Insider Piconi Robert

Role Chief Executive Officer

Bought 12,500 shs ($40K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	12,500	$3.2096	$40K

Holdings After Transaction: Common Stock — 16,921,594 shares (Direct)

Footnotes (1)

1. The shares are purchased in one transaction at a price given in Column 4. Reflects a transfer of securities in a transaction exempt from reporting pursuant to Rule 16a-12.

Key Figures

Shares purchased: 12,500 shares Purchase price: $3.2096 per share Shares owned after: 16,921,594 shares

3 metrics

Shares purchased 12,500 shares Open-market purchase of Common Stock

Purchase price $3.2096 per share Price for the 12,500-share open-market buy

Shares owned after 16,921,594 shares Direct Common Stock holdings following the transaction

Key Terms

open-market purchase, Common Stock, Rule 16a-12

3 terms

open-market purchase financial

"transaction_action: "open-market purchase""

An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.

Common Stock financial

"security_title: "Common Stock""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

Rule 16a-12 regulatory

"transfer of securities in a transaction exempt from reporting pursuant to Rule 16a-12"

Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Piconi Robert

(Last) (First) (Middle)

4165 EAST THOUSAND OAKS BLVD, SUITE 100

(Street)

WESTLAKE VILLAGE CALIFORNIA 91362

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Energy Vault Holdings, Inc. [ NRGV ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	X	10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Executive Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/31/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	03/31/2026		P		12,500(1)	A	$3.2096	16,921,594(2)	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The shares are purchased in one transaction at a price given in Column 4.

2. Reflects a transfer of securities in a transaction exempt from reporting pursuant to Rule 16a-12.

Remarks:

The reporting person no longer serves as investment advisor of the previously reported family trusts. As a result, the reporting person no longer has a reportable pecuniary interest in those shares for Section 16 reporting although the reporting person maintains voting control on said shares.

	/s/ Amy Blakeway, Chief Legal Officer	04/01/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did Energy Vault (NRGV) report for Robert Piconi?

Energy Vault reported that CEO Robert Piconi executed an open-market purchase of 12,500 shares of the company’s Common Stock. The shares were bought in a single transaction, indicating a direct increase in his equity stake in the company.

At what price did the Energy Vault (NRGV) CEO buy shares in this Form 4?

CEO Robert Piconi purchased 12,500 shares of Energy Vault Common Stock at a price of $3.2096 per share. The filing indicates this occurred as one open-market transaction, based on the price disclosed in the Form 4’s transaction details.

How many Energy Vault (NRGV) shares does Robert Piconi own after this transaction?

After the reported purchase, CEO Robert Piconi directly owns 16,921,594 shares of Energy Vault Common Stock. This figure, shown in the Form 4, reflects his total direct holdings immediately following the 12,500-share open-market acquisition.

Is the Energy Vault (NRGV) CEO’s Form 4 transaction a purchase or a sale?

The Form 4 for Energy Vault shows an open-market purchase by CEO Robert Piconi. The transaction code is “P,” and the normalized data describe it as a buy, meaning he increased his direct ownership of the company’s Common Stock.

Does the Energy Vault (NRGV) Form 4 mention any special exemptions or rules?

A footnote in the filing mentions a transfer of securities in a transaction exempt from reporting under Rule 16a-12. However, the key reported event here is the CEO’s open-market purchase of 12,500 Common Stock shares at $3.2096 per share.