What does the RSU structure mean for future Energy Vault (NRGV) share issuance?

Each of the 19,153 restricted stock units granted to Stephanie Unwin represents a contingent right to receive one share of Common Stock. Actual share delivery will occur when the RSUs vest on June 1, 2027, provided she remains on the Board through that vesting date.

Energy Vault director granted 19,153 RSUs

Unwin Stephanie reported acquisition or exercise transactions in this Form 4 filing.

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Form Type

Rhea-AI Filing Summary

Unwin Stephanie reported acquisition or exercise transactions in this Form 4 filing.

Energy Vault Holdings director Stephanie Unwin received a grant of 19,153 restricted stock units (RSUs) of Common Stock. The award was made at no cash cost to her and increases her direct holdings to 297,245 shares. The RSUs will vest on June 1, 2027, provided she continues serving on the Board.

Insider Trade Summary

Grant/Award: 19,153 shares

Grant/Award 1 txn

Insider Unwin Stephanie

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	19,153	$0.00	$0.00

Holdings After Transaction: Common Stock — 297,245 shares (Direct)

Footnotes (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: 19,153 units Grant price per RSU: $0.00 per unit Shares after transaction: 297,245 shares +1 more

4 metrics

RSUs granted 19,153 units Restricted stock unit award to director on May 29, 2026

Grant price per RSU $0.00 per unit Compensation grant, not open-market purchase

Shares after transaction 297,245 shares Director’s beneficial ownership following RSU award

Vesting date June 1, 2027 RSUs vest 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 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"

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 insider transaction did Energy Vault (NRGV) director Stephanie Unwin report?

Director Stephanie Unwin reported receiving a grant of 19,153 restricted stock units (RSUs) of Energy Vault Common Stock. This is a compensation-related equity award, not an open-market purchase or sale, and it increases her direct ownership stake in the company.

How many Energy Vault (NRGV) shares does Stephanie Unwin hold after this Form 4?

After the RSU grant, Stephanie Unwin is reported to beneficially own 297,245 shares of Energy Vault Common Stock. This figure includes the newly awarded 19,153 restricted stock units, which will convert into shares as they vest according to the award terms.

What are the vesting terms of Stephanie Unwin’s new NRGV RSU award?

The 19,153 restricted stock units awarded to Stephanie Unwin vest on June 1, 2027, subject to her continued service on Energy Vault’s Board. Each vested RSU represents the right to receive one share of Common Stock at that time, aligning compensation with long-term service.

Did Stephanie Unwin buy or sell NRGV shares in this Form 4 filing?

No open-market buy or sell occurred in this filing. Stephanie Unwin received a grant of 19,153 restricted stock units as a compensation award, at a stated price of $0.00 per unit, which is typical for equity-based director compensation rather than market transactions.

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

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Accepted by SEC EDGAR 06/01/2026 - 04:42 PM

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^*

Unwin Stephanie

(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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	05/29/2026		A		19,153⁽¹⁾	A	$0	297,245	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

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)

Source: View Original Filing on SEC EDGAR