Energy Vault (NRGV) director adds 5,000 shares in open-market buy

Rhea-AI Filing Summary

Energy Vault Holdings director Mary Beth Mandanas bought 5,000 shares of common stock in an open-market transaction at $3.65 per share. After this purchase, she directly holds 350,838 shares. The trade modestly increases her stake and reflects a small, routine insider buying activity.

Insider Trade Summary

Net Buyer: 5,000 shares ($18,250)

Net Buy 1 txn

Insider Mandanas Mary Beth

Role Director

Bought 5,000 shs ($18K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	5,000	$3.65	$18K

Holdings After Transaction: Common Stock — 350,838 shares (Direct)

Footnotes (1)

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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^*

Mandanas Mary Beth

(Last) (First) (Middle)

4165 EAST THOUSAND OAKS BLVD,

SUITE 100

(Street)

WESTLAKE VILLAGE CALIFORNIA 93162

(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		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/25/2026

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	03/25/2026		P		5,000	A	$3.65(1)	350,838	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.

Remarks:

	/s/ Amy Blakeway, Chief Legal Officer	03/26/2026
	** 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 Mary Beth Mandanas?

Energy Vault reported that director Mary Beth Mandanas bought 5,000 shares of common stock. The purchase was an open-market transaction at $3.65 per share, slightly increasing her direct ownership stake.

How many Energy Vault (NRGV) shares did the director buy and at what price?

The director purchased 5,000 Energy Vault common shares at $3.65 each. This open-market buy totals $18,250 before fees and represents a relatively small addition to her existing holdings.

What is Mary Beth Mandanas’ total Energy Vault (NRGV) holding after this Form 4?

After the reported transaction, Mary Beth Mandanas directly owns 350,838 Energy Vault common shares. The 5,000-share purchase modestly increases her position relative to her already sizable stake in the company.

Was the Energy Vault (NRGV) insider trade an open-market purchase or another type?

The filing shows an open-market purchase of common stock. The transaction code “P” and description confirm it was a standard market buy rather than an option exercise, gift, or tax-related withholding event.

Does the Energy Vault (NRGV) Form 4 show any insider share sales?

No, this Form 4 reflects only buying activity. The transactionSummary indicates one buy totaling 5,000 shares and zero reported sales, exercises, gifts, or tax-withholding dispositions in this filing.