Energy Vault (NRGV) director increases stake to 184,706 shares after $2.052 buy

Rhea-AI Filing Summary

Mary Beth Mandanas, a director of Energy Vault Holdings, Inc. (NRGV), reported a purchase of 10,000 shares of Common Stock on 09/11/2025 at a price of $2.052 per share. Following this transaction she beneficially owns 184,706 shares in a direct ownership capacity. The Form 4 filing indicates the shares were acquired in a single transaction and was signed on behalf of the reporting person by the company’s Chief Legal Officer on 09/12/2025. This disclosure documents an insider purchase by a company director and provides the updated direct share count after the acquisition.

Positive

• Director purchase disclosed: Acquisition of 10,000 shares may be viewed as an insider showing confidence.
• Clear reporting: Transaction date, price ($2.052), and updated direct ownership (184,706 shares) are explicitly stated.

Negative

• None.

Insights

Securities Analyst

TL;DR: A director purchased 10,000 shares at $2.052, increasing direct holdings to 184,706 shares.

This Form 4 records a straightforward insider buy by a director, which can signal confidence but is a single, small-scale transaction relative to typical institutional positions. The purchase price and post-transaction share count are clearly disclosed, and ownership is direct rather than indirect, limiting ambiguity about control or related-party holdings. No options, derivatives, or additional transactions are reported.

Corporate Governance Specialist

TL;DR: Director-level acquisition disclosed cleanly; no governance red flags in the filing.

The filing shows proper Section 16 reporting of an acquisition by a director with explicit transaction details and a manual signature by the Chief Legal Officer. The transaction code indicates a purchase and the remarks state it was a single transaction. There is no evidence in this filing of planned trading arrangements or indirect holdings that would require further disclosure.

Insider Trade Summary

Net Buyer: 10,000 shares ($20,520)

Net Buy 1 txn

Insider Mandanas Mary Beth

Role Director

Bought 10,000 shs ($21K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	10,000	$2.052	$21K

Holdings After Transaction: Common Stock — 184,706 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 CA 93162

(City) (State) (Zip)

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)

3. Date of Earliest Transaction (Month/Day/Year)
09/11/2025

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

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

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

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	09/11/2025		P		10,000	A(1)	$2.052	184,706	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/ Brad Eastman, Chief Legal Officer	09/12/2025
	** 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.

FAQ

What transaction did NRGV director Mary Beth Mandanas report on Form 4?

She reported a purchase of 10,000 shares of Energy Vault Holdings common stock on 09/11/2025 at $2.052 per share.

How many NRGV shares does Mary Beth Mandanas beneficially own after the reported transaction?

She beneficially owns 184,706 shares following the reported purchase.

Was the reported NRGV transaction direct or indirect ownership?

The Form 4 indicates direct (D) ownership for the reported shares.

Who signed the Form 4 for the reporting person and when?

The filing shows it was signed by /s/ Brad Eastman, Chief Legal Officer on 09/12/2025.

Does the Form 4 report any derivative transactions or option exercises for NRGV?

No. Table II for derivative securities contains no reported transactions; only the common stock purchase is disclosed.