Energy Vault director buys 5,450 NRGV shares

Energy Vault Holdings director buys shares on the open market.

Accepted by SEC EDGAR 03/05/2026 - 11:53 AM EST Learn about SEC filing dates

Rhea-AI Filing Summary

Energy Vault Holdings director buys shares on the open market. Director Ertel Thomas R purchased 5,450 shares of Energy Vault Holdings, Inc. common stock in an open-market transaction at a price of $3.3699 per share, bringing his directly held stake to 365,788 shares.

Insider Trade Summary

Net Buyer: 5,450 shares

Net Buy 1 txn

Insider Ertel Thomas R

Role Director

Bought 5,450 shs ($18K)

Increase in Position 1.5%

Type	Security	Shares	Price	Value
Purchase	Common Stock	5,450	$3.3699	$18K

Holdings After Transaction: Common Stock — 365,788 shares (Direct)

Holdings Before and After: Common Stock, 360,338 to 365,788 shares (Direct)

Other Insiders: 3 other insiders reported open-market purchases of this stock in the 30 days up to this filing.

Footnotes (1)

1. F1. The shares are purchased in one transaction at a price given in Column 4.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Energy Vault Holdings (NRGV) director Ertel Thomas R do in this Form 4?

Director Ertel Thomas R bought 5,450 shares of Energy Vault Holdings common stock. The purchase was an open-market transaction at $3.3699 per share, increasing his directly held position to 365,788 shares following the transaction.

How many Energy Vault Holdings (NRGV) shares were purchased and at what price?

The Form 4 reports a purchase of 5,450 common shares of Energy Vault Holdings. These shares were acquired in a single open-market transaction at a price of $3.3699 per share, as indicated in the transaction details and related footnote.

What is Ertel Thomas R’s total Energy Vault Holdings (NRGV) ownership after this trade?

After this open-market purchase, Ertel Thomas R directly owns 365,788 shares of Energy Vault Holdings common stock. This total reflects the addition of 5,450 shares acquired in the reported transaction under direct ownership.

Was the Energy Vault Holdings (NRGV) insider transaction a buy or a sell?

The transaction was a buy. The Form 4 classifies it as an open-market purchase of 5,450 common shares, coded as a “P” transaction and described as a purchase in open market or private transaction.

What type of security did the Energy Vault Holdings (NRGV) insider purchase?

The insider purchased common stock of Energy Vault Holdings, Inc. The Form 4 identifies the security title as “Common Stock” and shows this as a non-derivative, open-market purchase transaction increasing the director’s direct holdings.

Were the Energy Vault Holdings (NRGV) shares bought directly or indirectly?

The Form 4 classifies the ownership as direct. The direct_or_indirect code is “D,” and the ownership type is listed as direct, indicating the shares are held directly by Ertel Thomas R rather than through another entity.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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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^*

Ertel Thomas R

(Last) (First) (Middle)

4165 EAST THOUSAND OAKS BLVD, SUITE 100

(Street)

WESTLAKE VILLAGE CA 91362

(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)
03/04/2026

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	03/04/2026		P		5,450	A	$3.3699(1)	365,788	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	03/05/2026
	** 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.