Energy Vault director granted 22,026 RSUs

Mandanas Mary Beth reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Mandanas Mary Beth reported acquisition or exercise transactions in this Form 4 filing.

Energy Vault Holdings, Inc. director Mary Beth Mandanas received an equity grant in the form of restricted stock units. She was awarded 22,026 RSUs of Common Stock at no cash cost, increasing her direct holdings to 372,864 shares after the grant.

Each RSU represents a contingent right to receive one share of Common Stock. The RSUs vest on June 1, 2027, subject to her continued service on the Board, aligning part of her compensation with the company’s long-term performance.

Insider Trade Summary

Grant/Award: 22,026 shares

Grant/Award 1 txn

Insider Mandanas Mary Beth

Role Director

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

Holdings After Transaction: Common Stock — 372,864 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

RSUs granted: 22,026 units Grant price per share: $0.0000 per share Shares owned after grant: 372,864 shares +1 more

4 metrics

RSUs granted 22,026 units Restricted stock unit award on May 29, 2026

Grant price per share $0.0000 per share Reported transaction price for RSU grant

Shares owned after grant 372,864 shares Total common stock directly held post-transaction

RSU vesting date June 1, 2027 Vesting subject to continued Board service

Key Terms

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

4 terms

restricted stock units (RSUs) financial

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

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."

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.

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.

FAQ

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

What did Energy Vault (NRGV) director Mary Beth Mandanas report on this Form 4?

Mary Beth Mandanas reported receiving 22,026 restricted stock units of Energy Vault common stock as a compensation award. The grant increases her direct holdings to 372,864 shares after the transaction, aligning her incentives with long-term shareholder value through equity-based pay.

How many Energy Vault (NRGV) shares did Mary Beth Mandanas acquire in this transaction?

She acquired 22,026 restricted stock units, each representing a right to one share of common stock. These units were granted at a reported price of $0.00 per share as a compensatory equity award, rather than through an open-market stock purchase.

When do the RSUs granted to Energy Vault (NRGV) director Mary Beth Mandanas vest?

The restricted stock units vest on June 1, 2027, if she continues serving on the Board. Vesting means the contingent right converts into actual shares of common stock, adding to her directly owned stake in Energy Vault Holdings, Inc. at that time.

What is Mary Beth Mandanas’s total Energy Vault (NRGV) share ownership after this Form 4 transaction?

After the award, she directly holds 372,864 shares of Energy Vault common stock, including the reported grant. This figure reflects her post-transaction position as disclosed, providing context for the size of the new RSU grant relative to her overall holdings.

Was the Energy Vault (NRGV) Form 4 transaction a market purchase or sale of shares?

No, the Form 4 shows a grant of restricted stock units coded as an acquisition (code A), not a market trade. The transaction price per share is reported as $0.0000, indicating compensation-based equity rather than buying or selling on the open market.

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^*

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)
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	372,864	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)