Energy Vault director receives 22,026 RSU grant

Ertel Thomas R reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Ertel Thomas R reported acquisition or exercise transactions in this Form 4 filing.

Energy Vault Holdings, Inc. director Thomas R. Ertel received an award of 22,026 shares of Common Stock in the form of restricted stock units. The award was granted at no cash cost to him and increases his direct holdings to 387,814 shares.

Each RSU represents a right to receive one share of Common Stock, vesting on June 1, 2027, subject to his continued service on the Board. This filing reflects a compensation-related equity grant rather than an open-market purchase or sale.

Insider Trade Summary

Grant/Award: 22,026 shares

Grant/Award 1 txn

Insider Ertel Thomas R

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	22,026	$0.00	$0.00

Holdings After Transaction: Common Stock — 387,814 shares (Direct)

Footnotes (1)

1. F1. Reflects an award of restricted stock units (RSUs). Each RSU represents a contingent right to receive one share of Common Stock. The RSUs vest (subject to the reporting person's continued service on the Board) on June 1, 2027.

Key Figures

RSU grant size: 22,026 shares Grant price per share: $0.00 per share Holdings after transaction: 387,814 shares +2 more

5 metrics

RSU grant size 22,026 shares Restricted stock units of Common Stock granted to director

Grant price per share $0.00 per share RSU award recorded with no cash exercise price

Holdings after transaction 387,814 shares Total Common Stock directly held after RSU award

Vesting date June 1, 2027 RSUs vest subject to continued Board service

Transaction date May 29, 2026 Date of RSU grant reported on Form 4

Key Terms

restricted stock units (RSUs), contingent right, Common Stock, vest

4 terms

restricted stock units (RSUs) financial

"Reflects an award of restricted stock units (RSUs). Each RSU represents a contingent right to receive one share"

Restricted stock units (RSUs) are a type of company promise to give employees shares of stock in the future, usually after certain conditions like working for a set time. They are like a gift promised today that you receive later, which can become valuable if the company's stock price goes up. RSUs matter because they are a way companies reward employees and can be a significant part of compensation.

contingent right financial

"Each RSU represents a contingent right to receive one share of Common Stock"

Common Stock financial

"Each RSU represents a contingent right to receive one share of 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.

vest financial

"The RSUs vest (subject to the reporting person's continued service on the Board) on June 1, 2027"

A vest is the process by which an employee earns the right to receive certain benefits or ownership interests, such as stock or retirement funds, over time. It’s similar to earning a reward gradually, ensuring that the benefit becomes fully yours only after a set period or meeting specific conditions. This makes it important for investors because it determines when they can actually claim or use those benefits.

FAQ

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

What insider transaction did NRGV director Thomas R. Ertel report?

Director Thomas R. Ertel reported receiving 22,026 restricted stock units of Energy Vault Holdings, Inc. common stock. The award is a compensation grant at no cash cost and represents additional equity-based compensation tied to his continued board service.

How many Energy Vault (NRGV) shares does Thomas R. Ertel hold after this grant?

After the grant, Thomas R. Ertel directly holds 387,814 shares of Energy Vault common stock. This total includes the newly awarded 22,026 restricted stock units, which convert into shares if the vesting conditions tied to board service are satisfied.

What are the terms of the restricted stock units granted to NRGV director Ertel?

The 22,026 restricted stock units each represent a contingent right to receive one share of Energy Vault common stock. They vest on June 1, 2027, provided Ertel continues serving on the company’s Board until that vesting date is reached.

Was the NRGV insider transaction a market purchase or sale of shares?

The transaction was not a market purchase or sale. It was a grant of 22,026 restricted stock units as compensation, recorded at a price of $0.00 per share, meaning no cash changed hands in the open market for this award.

Does the Energy Vault (NRGV) Form 4 show any stock option exercises or derivative trades?

The Form 4 does not report any option exercises or derivative transactions. It shows only a single non-derivative grant of restricted stock units, with no remaining derivative positions listed in the accompanying derivative position summary.

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

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Accepted by SEC EDGAR 06/01/2026 - 04:42 PM Learn about SEC filing dates

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/29/2026

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	05/29/2026		A		22,026(1)	A	$0	387,814	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. Reflects an award of restricted stock units (RSUs). Each RSU represents a contingent right to receive one share of Common Stock. The RSUs vest (subject to the reporting person's continued service on the Board) on June 1, 2027.

Remarks:

	/s/ Amy Blakeway, Chief Legal Officer	06/01/2026
	** 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)